вроде доделал тесты адаптера

This reverts commit 4e3fd46750.

SquirrelContract/SquirrelBusinessLogic/Implementations/ClientBusinessLogicContract.cs

@@ -0,0 +1,70 @@
+using SquirrelContract.BusinessLogicContracts;
+using SquirrelContract.StoragesContracts;
+using Microsoft.Extensions.Logging;
+using SquirrelContract.Exceptions;
+using SquirrelContract.Extensions;
+using System.Text.Json;
+using System.Text.RegularExpressions;
+using SquirrelContract.DataModels;
+
+namespace SquirrelBusinessLogic.Implementations;
+
+public class ClientBusinessLogicContract(IClientStorageContract clientStorageContract, ILogger logger) : IClientBusinessLogicContract
+{
+    private readonly ILogger _logger = logger;
+    private readonly IClientStorageContract _clientStorageContract = clientStorageContract;
+
+    public List<ClientDataModel> GetAllClients()
+    {
+        _logger.LogInformation("GetAllClients");
+        return _clientStorageContract.GetList() ?? throw new NullListException();
+    }
+
+    public ClientDataModel GetClientByData(string data)
+    {
+        _logger.LogInformation("Get element by data: {data}", data);
+        if (data.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(data));
+        }
+        if (data.IsGuid())
+        {
+            return _clientStorageContract.GetElementById(data) ?? throw new ElementNotFoundException(data);
+        }
+        if (Regex.IsMatch(data, @"^((8|\+7)[\- ]?)?(\(?\d{3}\)?[\- ]?)?[\d\- ]{7,10}$"))
+        {
+            return _clientStorageContract.GetElementByPhoneNumber(data) ?? throw new ElementNotFoundException(data);
+        }
+        return _clientStorageContract.GetElementByFIO(data) ?? throw new ElementNotFoundException(data);
+    }
+
+    public void InsertClient(ClientDataModel clientDataModel)
+    {
+        _logger.LogInformation("New data: {json}", JsonSerializer.Serialize(clientDataModel));
+        ArgumentNullException.ThrowIfNull(clientDataModel);
+        clientDataModel.Validate();
+        _clientStorageContract.AddElement(clientDataModel);
+    }
+
+    public void UpdateClient(ClientDataModel clientDataModel)
+    {
+        _logger.LogInformation("Update data: {json}", JsonSerializer.Serialize(clientDataModel));
+        ArgumentNullException.ThrowIfNull(clientDataModel);
+        clientDataModel.Validate();
+        _clientStorageContract.UpdElement(clientDataModel);
+    }
+
+    public void DeleteClient(string id)
+    {
+        _logger.LogInformation("Delete by id: {id}", id);
+        if (id.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(id));
+        }
+        if (!id.IsGuid())
+        {
+            throw new ValidationException("Id is not a unique identifier");
+        }
+        _clientStorageContract.DelElement(id);
+    }
+}

SquirrelContract/SquirrelBusinessLogic/Implementations/CocktailBusinessLogicContract.cs

@@ -0,0 +1,79 @@
+using Microsoft.Extensions.Logging;
+using SquirrelContract.BusinessLogicContracts;
+using SquirrelContract.DataModels;
+using SquirrelContract.Exceptions;
+using SquirrelContract.Extensions;
+using SquirrelContract.StoragesContracts;
+using System.Text.Json;
+using System.Text.RegularExpressions;
+
+namespace SquirrelBusinessLogic.Implementations;
+
+public class CocktailBusinessLogicContract(ICocktailStorageContract cocktailStorageContract, ILogger logger) : ICocktailBusinessLogicContract
+{
+    private readonly ILogger _logger = logger;
+    private readonly ICocktailStorageContract _cocktailStorageContract = cocktailStorageContract;
+    public List<CocktailDataModel> GetAllCocktails()
+    {
+        _logger.LogInformation("GetAllCocktails");
+        return _cocktailStorageContract.GetList() ?? throw new NullListException();
+    }
+
+    public List<CocktailHistoryDataModel> GetCocktailHistoryByCocktail(string cocktailId)
+    {
+        _logger.LogInformation("GetCocktailHistoryByCocktail for {cocktailId}", cocktailId);
+        if (cocktailId.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(cocktailId));
+        }
+        if (!cocktailId.IsGuid())
+        {
+            throw new ValidationException("The value in the field cocktailId is not a unique identifier.");
+        }
+        return _cocktailStorageContract.GetHistoryByCocktailId(cocktailId) ?? throw new NullListException();
+    }
+
+    public CocktailDataModel GetCocktailByData(string data)
+    {
+        _logger.LogInformation("Get element by data: {data}", data);
+        if (data.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(data));
+        }
+        if (data.IsGuid())
+        {
+            return _cocktailStorageContract.GetElementById(data) ?? throw new ElementNotFoundException(data);
+        }
+        return _cocktailStorageContract.GetElementByName(data) ?? throw new ElementNotFoundException(data);
+    }
+
+    public void InsertCocktail(CocktailDataModel cocktailDataModel)
+    {
+        _logger.LogInformation("New data: {json}", JsonSerializer.Serialize(cocktailDataModel));
+        ArgumentNullException.ThrowIfNull(cocktailDataModel);
+        cocktailDataModel.Validate();
+        _cocktailStorageContract.AddElement(cocktailDataModel);
+    }
+
+    public void UpdateCocktail(CocktailDataModel cocktailDataModel)
+    {
+        _logger.LogInformation("Update data: {json}", JsonSerializer.Serialize(cocktailDataModel));
+        ArgumentNullException.ThrowIfNull(cocktailDataModel);
+        cocktailDataModel.Validate();
+        _cocktailStorageContract.UpdElement(cocktailDataModel);
+    }
+
+    public void DeleteCocktail(string id)
+    {
+        _logger.LogInformation("Delete by id: {id}", id);
+        if (id.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(id));
+        }
+        if (!id.IsGuid())
+        {
+            throw new ValidationException("Id is not a unique identifier");
+        }
+        _cocktailStorageContract.DelElement(id);
+    }
+}

SquirrelContract/SquirrelBusinessLogic/Implementations/EmployeeBusinessLogicContract.cs

@@ -0,0 +1,104 @@
+using Microsoft.Extensions.Logging;
+using SquirrelContract.BusinessLogicContracts;
+using SquirrelContract.DataModels;
+using SquirrelContract.Exceptions;
+using SquirrelContract.Extensions;
+using SquirrelContract.StoragesContracts;
+using System.Text.Json;
+using System.Text.RegularExpressions;
+
+namespace SquirrelBusinessLogic.Implementations;
+
+public class EmployeeBusinessLogicContract(IEmployeeStorageContract employeeStorageContract, ILogger logger) : IEmployeeBusinessLogicContract
+{
+    private readonly ILogger _logger = logger;
+    private readonly IEmployeeStorageContract _employeeStorageContract = employeeStorageContract;
+
+    public List<EmployeeDataModel> GetAllEmployees(bool onlyActive = true)
+    {
+        _logger.LogInformation("GetAllEmployees params: {onlyActive}", onlyActive);
+        return _employeeStorageContract.GetList(onlyActive) ?? throw new NullListException();
+    }
+
+    public List<EmployeeDataModel> GetAllEmployeesByPost(string postId, bool onlyActive = true)
+    {
+        _logger.LogInformation("GetAllEmployees params: {postId}, {onlyActive},", postId, onlyActive);
+        if (postId.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(postId));
+        }
+        if (!postId.IsGuid())
+        {
+            throw new ValidationException("The value in the field postId is not a unique identifier.");
+        }
+        return _employeeStorageContract.GetList(onlyActive, postId) ?? throw new NullListException();
+    }
+
+    public List<EmployeeDataModel> GetAllEmployeesByBirthDate(DateTime fromDate, DateTime toDate, bool onlyActive = true)
+    {
+        _logger.LogInformation("GetAllEmployees params: {onlyActive}, {fromDate}, {toDate}", onlyActive, fromDate, toDate);
+        if (fromDate.IsDateNotOlder(toDate))
+        {
+            throw new IncorrectDatesException(fromDate, toDate);
+        }
+        return _employeeStorageContract.GetList(onlyActive, fromBirthDate: fromDate, toBirthDate: toDate) ?? throw new NullListException();
+    }
+
+    public List<EmployeeDataModel> GetAllEmployeesByEmploymentDate(DateTime fromDate, DateTime toDate, bool onlyActive = true)
+    {
+        _logger.LogInformation("GetAllEmployees params: {onlyActive}, {fromDate}, {toDate}", onlyActive, fromDate, toDate);
+        if (fromDate.IsDateNotOlder(toDate))
+        {
+            throw new IncorrectDatesException(fromDate, toDate);
+        }
+        return _employeeStorageContract.GetList(onlyActive, fromEmploymentDate: fromDate, toEmploymentDate: toDate) ?? throw new NullListException();
+    }
+
+    public EmployeeDataModel GetEmployeeByData(string data)
+    {
+        _logger.LogInformation("Get element by data: {data}", data);
+        if (data.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(data));
+        }
+        if (data.IsGuid())
+        {
+            return _employeeStorageContract.GetElementById(data) ?? throw new ElementNotFoundException(data);
+        }
+        if (Regex.IsMatch(data, @"^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$"))
+        {
+            return _employeeStorageContract.GetElementByEmail(data) ?? throw new ElementNotFoundException(data);
+        }
+        return _employeeStorageContract.GetElementByFIO(data) ?? throw new ElementNotFoundException(data);
+    }
+
+    public void InsertEmployee(EmployeeDataModel employeeDataModel)
+    {
+        _logger.LogInformation("New data: {json}", JsonSerializer.Serialize(employeeDataModel));
+        ArgumentNullException.ThrowIfNull(employeeDataModel);
+        employeeDataModel.Validate();
+        _employeeStorageContract.AddElement(employeeDataModel);
+    }
+
+    public void UpdateEmployee(EmployeeDataModel employeeDataModel)
+    {
+        _logger.LogInformation("Update data: {json}", JsonSerializer.Serialize(employeeDataModel));
+        ArgumentNullException.ThrowIfNull(employeeDataModel);
+        employeeDataModel.Validate();
+        _employeeStorageContract.UpdElement(employeeDataModel);
+    }
+
+    public void DeleteEmployee(string id)
+    {
+        _logger.LogInformation("Delete by id: {id}", id);
+        if (id.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(id));
+        }
+        if (!id.IsGuid())
+        {
+            throw new ValidationException("Id is not a unique identifier");
+        }
+        _employeeStorageContract.DelElement(id);
+    }
+}

SquirrelContract/SquirrelBusinessLogic/Implementations/PostBusinessLogicContract.cs

@@ -0,0 +1,92 @@
+using Microsoft.Extensions.Logging;
+using SquirrelContract.BusinessLogicContracts;
+using SquirrelContract.DataModels;
+using SquirrelContract.Exceptions;
+using SquirrelContract.Extensions;
+using SquirrelContract.StoragesContracts;
+using System.Text.Json;
+
+namespace SquirrelBusinessLogic.Implementations;
+
+public class PostBusinessLogicContract(IPostStorageContract postStorageContract, ILogger logger) : IPostBusinessLogicContract
+{
+    private readonly ILogger _logger = logger;
+    private readonly IPostStorageContract _postStorageContract = postStorageContract;
+    public List<PostDataModel> GetAllPosts()
+    {
+        _logger.LogInformation("GetAllPosts");
+        return _postStorageContract.GetList() ?? throw new NullListException();
+    }
+
+    public List<PostDataModel> GetAllDataOfPost(string postId)
+    {
+        _logger.LogInformation("GetAllDataOfPost for {postId}", postId);
+        if (postId.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(postId));
+        }
+        if (!postId.IsGuid())
+        {
+            throw new ValidationException("The value in the field postId is not a unique identifier.");
+        }
+        return _postStorageContract.GetPostWithHistory(postId) ?? throw new NullListException();
+    }
+
+    public PostDataModel GetPostByData(string data)
+    {
+        _logger.LogInformation("Get element by data: {data}", data);
+        if (data.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(data));
+        }
+        if (data.IsGuid())
+        {
+            return _postStorageContract.GetElementById(data) ?? throw new ElementNotFoundException(data);
+        }
+        return _postStorageContract.GetElementByName(data) ?? throw new ElementNotFoundException(data);
+    }
+
+    public void InsertPost(PostDataModel postDataModel)
+    {
+        _logger.LogInformation("New data: {json}", JsonSerializer.Serialize(postDataModel));
+        ArgumentNullException.ThrowIfNull(postDataModel);
+        postDataModel.Validate();
+        _postStorageContract.AddElement(postDataModel);
+    }
+
+    public void UpdatePost(PostDataModel postDataModel)
+    {
+        _logger.LogInformation("Update data: {json}", JsonSerializer.Serialize(postDataModel));
+        ArgumentNullException.ThrowIfNull(postDataModel);
+        postDataModel.Validate();
+        _postStorageContract.UpdElement(postDataModel);
+    }
+
+    public void DeletePost(string id)
+    {
+        _logger.LogInformation("Delete by id: {id}", id);
+        if (id.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(id));
+        }
+        if (!id.IsGuid())
+        {
+            throw new ValidationException("Id is not a unique identifier");
+        }
+        _postStorageContract.DelElement(id);
+    }
+
+    public void RestorePost(string id)
+    {
+        _logger.LogInformation("Restore by id: {id}", id);
+        if (id.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(id));
+        }
+        if (!id.IsGuid())
+        {
+            throw new ValidationException("Id is not a unique identifier");
+        }
+        _postStorageContract.ResElement(id);
+    }
+}

SquirrelContract/SquirrelBusinessLogic/Implementations/SalaryBusinessLogicContract.cs

@@ -0,0 +1,63 @@
+using BarBelochkaContract.DataModels;
+using Microsoft.Extensions.Logging;
+using SquirrelContract.BusinessLogicContracts;
+using SquirrelContract.Exceptions;
+using SquirrelContract.Extensions;
+using SquirrelContract.StoragesContracts;
+
+namespace SquirrelBusinessLogic.Implementations;
+
+public class SalaryBusinessLogicContract(ISalaryStorageContract salaryStorageContract,
+    ISaleStorageContract saleStorageContract, IPostStorageContract postStorageContract, IEmployeeStorageContract employeeStorageContract, ILogger logger) : ISalaryBusinessLogicContract
+{
+    private readonly ILogger _logger = logger;
+    private readonly ISalaryStorageContract _salaryStorageContract = salaryStorageContract;
+    private readonly ISaleStorageContract _saleStorageContract = saleStorageContract;
+    private readonly IPostStorageContract _postStorageContract = postStorageContract;
+    private readonly IEmployeeStorageContract _employeeStorageContract = employeeStorageContract;
+    public List<SalaryDataModel> GetAllSalariesByPeriod(DateTime fromDate, DateTime toDate)
+    {
+        _logger.LogInformation("GetAllSalaries params: {fromDate}, {toDate}", fromDate, toDate);
+        if (fromDate.IsDateNotOlder(toDate))
+        {
+            throw new IncorrectDatesException(fromDate, toDate);
+        }
+        return _salaryStorageContract.GetList(fromDate, toDate) ?? throw new NullListException();
+    }
+
+    public List<SalaryDataModel> GetAllSalariesByPeriodByEmployee(DateTime fromDate, DateTime toDate, string employeeId)
+    {
+        if (fromDate.IsDateNotOlder(toDate))
+        {
+            throw new IncorrectDatesException(fromDate, toDate);
+        }
+        if (employeeId.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(employeeId));
+        }
+        if (!employeeId.IsGuid())
+        {
+            throw new ValidationException("The value in the field employeeId is not a unique identifier.");
+        }
+        _logger.LogInformation("GetAllSalaries params: {fromDate}, {toDate}, {employeeId}", fromDate, toDate, employeeId);
+        return _salaryStorageContract.GetList(fromDate, toDate, employeeId) ?? throw new NullListException();
+    }
+
+    public void CalculateSalaryByMounth(DateTime date)
+    {
+        _logger.LogInformation("CalculateSalaryByMounth: {date}", date);
+        var startDate = new DateTime(date.Year, date.Month, 1);
+        var finishDate = new DateTime(date.Year, date.Month, DateTime.DaysInMonth(date.Year, date.Month));
+        var employees = _employeeStorageContract.GetList() ?? throw new NullListException();
+        foreach (var employee in employees)
+        {
+            var sales = _saleStorageContract.GetList(startDate, finishDate, employeeId: employee.Id)?.Sum(x => x.Sum) ??
+                throw new NullListException();
+            var post = _postStorageContract.GetElementById(employee.PostId) ??
+                throw new NullListException();
+            var salary = post.Salary + sales * 0.1;
+            _logger.LogDebug("The employee {employeeId} was paid a salary of {salary}", employee.Id, salary);
+            _salaryStorageContract.AddElement(new SalaryDataModel(employee.Id, DateTime.SpecifyKind(finishDate, DateTimeKind.Utc), salary));
+        }
+    }
+}

SquirrelContract/SquirrelBusinessLogic/Implementations/SaleBusinessLogicContract.cs

@@ -0,0 +1,120 @@
+using Microsoft.Extensions.Logging;
+using SquirrelContract.BusinessLogicContracts;
+using SquirrelContract.DataModels;
+using SquirrelContract.Exceptions;
+using SquirrelContract.Extensions;
+using SquirrelContract.StoragesContracts;
+using System.Text.Json;
+
+namespace SquirrelBusinessLogic.Implementations;
+
+public class SaleBusinessLogicContract(ISaleStorageContract saleStorageContract, IWarehouseStorageContract warehouseStorageContract, ILogger logger) : ISaleBusinessLogicContract
+{
+    private readonly ILogger _logger = logger;
+    private readonly ISaleStorageContract _saleStorageContract = saleStorageContract;
+    private readonly IWarehouseStorageContract _warehouseStorageContract = warehouseStorageContract;
+
+    public List<SaleDataModel> GetAllSalesByPeriod(DateTime fromDate, DateTime toDate)
+    {
+        _logger.LogInformation("GetAllSales params: {fromDate}, {toDate}", fromDate, toDate);
+        if (fromDate.IsDateNotOlder(toDate))
+        {
+            throw new IncorrectDatesException(fromDate, toDate);
+        }
+        return _saleStorageContract.GetList(fromDate, toDate) ?? throw new NullListException();
+    }
+
+    public List<SaleDataModel> GetAllSalesByEmployeeByPeriod(string employeeId, DateTime fromDate, DateTime toDate)
+    {
+        _logger.LogInformation("GetAllSales params: {employeeId}, {fromDate}, {toDate}", employeeId, fromDate, toDate);
+        if (fromDate.IsDateNotOlder(toDate))
+        {
+            throw new IncorrectDatesException(fromDate, toDate);
+        }
+        if (employeeId.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(employeeId));
+        }
+        if (!employeeId.IsGuid())
+        {
+            throw new ValidationException("The value in the field employeeId is not a unique identifier.");
+        }
+        return _saleStorageContract.GetList(fromDate, toDate, employeeId: employeeId) ?? throw new NullListException();
+    }
+
+    public List<SaleDataModel> GetAllSalesByClientByPeriod(string clientId, DateTime fromDate, DateTime toDate)
+    {
+        _logger.LogInformation("GetAllSales params: {buyerId}, {fromDate}, {toDate}", clientId, fromDate, toDate);
+        if (fromDate.IsDateNotOlder(toDate))
+        {
+            throw new IncorrectDatesException(fromDate, toDate);
+        }
+        if (clientId.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(clientId));
+        }
+        if (!clientId.IsGuid())
+        {
+            throw new ValidationException("The value in the field clientId is not a unique identifier.");
+        }
+        return _saleStorageContract.GetList(fromDate, toDate, clientId: clientId) ?? throw new NullListException();
+    }
+
+    public List<SaleDataModel> GetAllSalesByCocktailByPeriod(string cocktailId, DateTime fromDate, DateTime toDate)
+    {
+        _logger.LogInformation("GetAllSales params: {cocktailId}, {fromDate}, {toDate}", cocktailId, fromDate, toDate);
+        if (fromDate.IsDateNotOlder(toDate))
+        {
+            throw new IncorrectDatesException(fromDate, toDate);
+        }
+        if (cocktailId.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(cocktailId));
+        }
+        if (!cocktailId.IsGuid())
+        {
+            throw new ValidationException("The value in the field cocktailId is not a unique identifier.");
+        }
+        return _saleStorageContract.GetList(fromDate, toDate, cocktailId: cocktailId) ?? throw new NullListException();
+    }
+
+    public SaleDataModel GetSaleByData(string data)
+    {
+        _logger.LogInformation("Get element by data: {data}", data);
+        if (data.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(data));
+        }
+        if (!data.IsGuid())
+        {
+            throw new ValidationException("Id is not a unique identifier");
+        }
+        return _saleStorageContract.GetElementById(data) ?? throw new ElementNotFoundException(data);
+    }
+
+    public void InsertSale(SaleDataModel saleDataModel)
+    {
+        _logger.LogInformation("New data: {json}", JsonSerializer.Serialize(saleDataModel));
+        ArgumentNullException.ThrowIfNull(saleDataModel);
+        saleDataModel.Validate();
+        if (!_warehouseStorageContract.CheckCocktails(saleDataModel))
+        {
+            throw new InsufficientStockException("Dont have cocktails in warehouse");
+        }
+        _saleStorageContract.AddElement(saleDataModel);
+    }
+
+    public void CancelSale(string id)
+    {
+        _logger.LogInformation("Cancel by id: {id}", id);
+        if (id.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(id));
+        }
+        if (!id.IsGuid())
+        {
+            throw new ValidationException("Id is not a unique identifier");
+        }
+        _saleStorageContract.DelElement(id);
+    }
+}

SquirrelContract/SquirrelBusinessLogic/Implementations/SupplyBusinessLogicContract.cs

@@ -0,0 +1,103 @@
+using Microsoft.Extensions.Logging;
+using SquirrelContract.BusinessLogicContracts;
+using SquirrelContract.DataModels;
+using SquirrelContract.Exceptions;
+using SquirrelContract.Extensions;
+using SquirrelContract.StoragesContracts;
+using System.Text.Json;
+
+namespace SquirrelBusinessLogic.Implementations;
+
+public class SupplyBusinessLogicContract(ISupplyStorageContract supplyStorageContract, IWarehouseStorageContract warehouseStorageContract, ILogger logger) : ISupplyBusinessLogicContract
+{
+    private readonly ILogger _logger = logger;
+    private readonly ISupplyStorageContract _supplyStorageContract = supplyStorageContract;
+    private readonly IWarehouseStorageContract _warehouseStorageContract = warehouseStorageContract;
+    public List<SupplyDataModel> GetAllSuppliesByPeriod(DateTime fromDate, DateTime toDate)
+    {
+        _logger.LogInformation("GetAllSupplies params: {fromDate}, {toDate}", fromDate, toDate);
+        if (fromDate.IsDateNotOlder(toDate))
+        {
+            throw new IncorrectDatesException(fromDate, toDate);
+        }
+        return _supplyStorageContract.GetList(fromDate, toDate) ?? throw new NullListException();
+    }
+
+    public List<SupplyDataModel> GetAllSuppliesByCocktailByPeriod(string cocktailId, DateTime fromDate, DateTime toDate)
+    {
+        _logger.LogInformation("GetAllSupplies params: {cocktailId}, {fromDate}, {toDate}", cocktailId, fromDate, toDate);
+        if (fromDate.IsDateNotOlder(toDate))
+        {
+            throw new IncorrectDatesException(fromDate, toDate);
+        }
+        if (cocktailId.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(cocktailId));
+        }
+        if (!cocktailId.IsGuid())
+        {
+            throw new ValidationException("The value in the field cocktailId is not a unique identifier.");
+        }
+        return _supplyStorageContract.GetList(fromDate, toDate, cocktailId: cocktailId) ?? throw new NullListException();
+    }
+
+    public SupplyDataModel GetSupplyByData(string data)
+    {
+        _logger.LogInformation("Get supply by data: {data}", data);
+        if (data.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(data));
+        }
+        if (!data.IsGuid())
+        {
+            throw new ElementNotFoundException(data);
+        }
+        return _supplyStorageContract.GetElementById(data) ?? throw new ElementNotFoundException(data);
+    }
+
+    public void ProcessSupply(SupplyDataModel supplyDataModel)
+    {
+        _logger.LogInformation("Processing supply: {json}", JsonSerializer.Serialize(supplyDataModel));
+
+        ArgumentNullException.ThrowIfNull(supplyDataModel);
+        supplyDataModel.Validate();
+
+        foreach (var supplyCocktail in supplyDataModel.Cocktails)
+        {
+            var warehouses = _warehouseStorageContract.GetList();
+
+            var targetWarehouse = warehouses.FirstOrDefault(w =>
+                w.Cocktails.Any(c => c.CocktailId == supplyCocktail.CocktailId));
+
+            if (targetWarehouse == null)
+            {
+                targetWarehouse = warehouses.FirstOrDefault();
+                if (targetWarehouse == null)
+                {
+                    throw new ElementNotFoundException("No warehouse found for supply.");
+                }
+            }
+
+            _warehouseStorageContract.UpdWarehouseOnSupply(targetWarehouse.Id, supplyCocktail.CocktailId, supplyCocktail.Count);
+        }
+    }
+
+    public void InsertSupply(SupplyDataModel supplyDataModel)
+    {
+        _logger.LogInformation("New data: {json}", JsonSerializer.Serialize(supplyDataModel));
+        ArgumentNullException.ThrowIfNull(supplyDataModel);
+        supplyDataModel.Validate();
+        _supplyStorageContract.AddElement(supplyDataModel);
+        ProcessSupply(supplyDataModel);
+    }
+
+    public void UpdateSupply(SupplyDataModel supplyDataModel)
+    {
+        _logger.LogInformation("Update data: {json}", JsonSerializer.Serialize(supplyDataModel));
+        ArgumentNullException.ThrowIfNull(supplyDataModel);
+        supplyDataModel.Validate();
+        _supplyStorageContract.UpdateElement(supplyDataModel);
+        ProcessSupply(supplyDataModel);
+    }
+
+}

SquirrelContract/SquirrelBusinessLogic/Implementations/WarehouseBusinessLogicContract.cs

@@ -0,0 +1,65 @@
+using Microsoft.Extensions.Logging;
+using SquirrelContract.BusinessLogicContracts;
+using SquirrelContract.DataModels;
+using SquirrelContract.Exceptions;
+using SquirrelContract.Extensions;
+using SquirrelContract.StoragesContracts;
+using System.Text.Json;
+
+namespace SquirrelBusinessLogic.Implementations;
+
+public class WarehouseBusinessLogicContract(IWarehouseStorageContract warehouseStorageContract, ILogger logger) : IWarehouseBusinessLogicContract
+{
+    private readonly ILogger _logger = logger;
+    private readonly IWarehouseStorageContract _warehouseStorageContract = warehouseStorageContract;
+    public List<WarehouseDataModel> GetAllWarehouses()
+    {
+        _logger.LogInformation("GetAllWarehouses");
+        return _warehouseStorageContract.GetList() ?? throw new NullListException();
+    }
+
+    public WarehouseDataModel GetWarehouseByData(string data)
+    {
+        _logger.LogInformation("Get element by data: {data}", data);
+        if (data.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(data));
+        }
+        if (data.IsGuid())
+        {
+            return _warehouseStorageContract.GetElementById(data) ?? throw new ElementNotFoundException(data);
+        }
+        return _warehouseStorageContract.GetElementByName(data) ?? throw new ElementNotFoundException(data);
+
+    }
+
+    public void InsertWarehouse(WarehouseDataModel warehouseDataModel)
+    {
+        _logger.LogInformation("New data: {json}", JsonSerializer.Serialize(warehouseDataModel));
+        ArgumentNullException.ThrowIfNull(warehouseDataModel);
+        warehouseDataModel.Validate();
+        _warehouseStorageContract.AddElement(warehouseDataModel);
+    }
+
+    public void UpdateWarehouse(WarehouseDataModel warehouseDataModel)
+    {
+        _logger.LogInformation("Update data: {json}", JsonSerializer.Serialize(warehouseDataModel));
+        ArgumentNullException.ThrowIfNull(warehouseDataModel);
+        warehouseDataModel.Validate();
+        _warehouseStorageContract.UpdElement(warehouseDataModel);
+    }
+
+    public void DeleteWarehouse(string id)
+    {
+        logger.LogInformation("Delete by id: {id}", id);
+        if (id.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(id));
+        }
+        if (!id.IsGuid())
+        {
+            throw new ValidationException("Id is not a unique identifier");
+        }
+        _warehouseStorageContract.DelElement(id);
+    }
+}

SquirrelContract/SquirrelBusinessLogic/SquirrelBusinessLogic.csproj

@@ -0,0 +1,22 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+	<ItemGroup>
+		<InternalsVisibleTo Include="SquirrelTests" />
+		<InternalsVisibleTo Include="DynamicProxyGenAssembly2" />
+	</ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="9.0.2" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\SquirrelContract\SquirrelContract.csproj" />
+  </ItemGroup>
+
+</Project>

SquirrelContract/SquirrelContract.sln

@@ -1,10 +1,18 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio Version 17
-VisualStudioVersion = 17.12.35707.178 d17.12
+VisualStudioVersion = 17.12.35707.178
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SquirrelContract", "SquirrelContract\SquirrelContract.csproj", "{3B0E65D7-E64B-4893-803B-A59D9F2C8836}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SquirrelTests", "SquirrelTests\SquirrelTests.csproj", "{CC02A7DA-AA53-4D19-BB16-4DDA5243EB33}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SquirrelBusinessLogic", "SquirrelBusinessLogic\SquirrelBusinessLogic.csproj", "{C03D0604-CD06-42DA-99CB-23B8306C3714}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SquirrelDatabase", "SquirrelDatabase\SquirrelDatabase.csproj", "{A8A7A434-A278-4362-8D34-C2E3CAA938C1}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SquirrelWebApi", "SquirrelWebApi\SquirrelWebApi.csproj", "{45D1F24F-AFCD-4259-88C2-3076E38254A9}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -15,8 +23,27 @@ Global
 		{3B0E65D7-E64B-4893-803B-A59D9F2C8836}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{3B0E65D7-E64B-4893-803B-A59D9F2C8836}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{3B0E65D7-E64B-4893-803B-A59D9F2C8836}.Release|Any CPU.Build.0 = Release|Any CPU
+		{CC02A7DA-AA53-4D19-BB16-4DDA5243EB33}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{CC02A7DA-AA53-4D19-BB16-4DDA5243EB33}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{CC02A7DA-AA53-4D19-BB16-4DDA5243EB33}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{CC02A7DA-AA53-4D19-BB16-4DDA5243EB33}.Release|Any CPU.Build.0 = Release|Any CPU
+		{C03D0604-CD06-42DA-99CB-23B8306C3714}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{C03D0604-CD06-42DA-99CB-23B8306C3714}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{C03D0604-CD06-42DA-99CB-23B8306C3714}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{C03D0604-CD06-42DA-99CB-23B8306C3714}.Release|Any CPU.Build.0 = Release|Any CPU
+		{A8A7A434-A278-4362-8D34-C2E3CAA938C1}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{A8A7A434-A278-4362-8D34-C2E3CAA938C1}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{A8A7A434-A278-4362-8D34-C2E3CAA938C1}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{A8A7A434-A278-4362-8D34-C2E3CAA938C1}.Release|Any CPU.Build.0 = Release|Any CPU
+		{45D1F24F-AFCD-4259-88C2-3076E38254A9}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{45D1F24F-AFCD-4259-88C2-3076E38254A9}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{45D1F24F-AFCD-4259-88C2-3076E38254A9}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{45D1F24F-AFCD-4259-88C2-3076E38254A9}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
 	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {E3B65E92-8603-4ED7-8214-9DA9A305DAFF}
+	EndGlobalSection
 EndGlobal

SquirrelContract/SquirrelContract/AdapterContracts/IClientAdapter.cs

@@ -0,0 +1,16 @@
+namespace SquirrelContract.AdapterContracts;
+using SquirrelContract.AdapterContracts.OperationResponses;
+using SquirrelContract.BindingModels;
+
+public interface IClientAdapter
+{
+    ClientOperationResponse GetList();
+
+    ClientOperationResponse GetElement(string data);
+
+    ClientOperationResponse RegisterClient(ClientBindingModel clientModel);
+
+    ClientOperationResponse ChangeClientInfo(ClientBindingModel clientModel);
+
+    ClientOperationResponse RemoveClient(string id);
+}

SquirrelContract/SquirrelContract/AdapterContracts/ICocktailAdapter.cs

@@ -0,0 +1,19 @@
+using SquirrelContract.BindingModels;
+using SquirrelContract.AdapterContracts.OperationResponses;
+
+namespace SquirrelContract.AdapterContracts;
+
+public interface ICocktailAdapter
+{
+    CocktailOperationResponse GetList(bool includeDeleted);
+
+    CocktailOperationResponse GetHistory(string id);
+
+    CocktailOperationResponse GetElement(string data);
+
+    CocktailOperationResponse RegisterCocktail(CocktailBindingModel cocktailModel);
+
+    CocktailOperationResponse ChangeCocktailInfo(CocktailBindingModel cocktailModel);
+
+    CocktailOperationResponse RemoveCocktail(string id);
+}

SquirrelContract/SquirrelContract/AdapterContracts/IEmployeeAdapter.cs

@@ -0,0 +1,23 @@
+using SquirrelContract.AdapterContracts.OperationResponses;
+using SquirrelContract.BindingModels;
+
+namespace SquirrelContract.AdapterContracts;
+
+public interface IEmployeeAdapter
+{
+    EmployeeOperationResponse GetList(bool includeDeleted);
+
+    EmployeeOperationResponse GetPostList(string id, bool includeDeleted);
+
+    EmployeeOperationResponse GetListByBirthDate(DateTime fromDate, DateTime toDate, bool includeDeleted);
+
+    EmployeeOperationResponse GetListByEmploymentDate(DateTime fromDate, DateTime toDate, bool includeDeleted);
+
+    EmployeeOperationResponse GetElement(string data);
+
+    EmployeeOperationResponse RegisterEmployee(EmployeeBindingModel employeeModel);
+
+    EmployeeOperationResponse ChangeEmployeeInfo(EmployeeBindingModel employeeModel);
+
+    EmployeeOperationResponse RemoveEmployee(string id);
+}

SquirrelContract/SquirrelContract/AdapterContracts/IPostAdapter.cs

@@ -0,0 +1,21 @@
+using SquirrelContract.AdapterContracts.OperationResponses;
+using SquirrelContract.BindingModels;
+
+namespace SquirrelContract.AdapterContracts;
+
+public interface IPostAdapter
+{
+    PostOperationResponse GetList();
+
+    PostOperationResponse GetHistory(string id);
+
+    PostOperationResponse GetElement(string data);
+
+    PostOperationResponse RegisterPost(PostBindingModel postModel);
+
+    PostOperationResponse ChangePostInfo(PostBindingModel postModel);
+
+    PostOperationResponse RemovePost(string id);
+
+    PostOperationResponse RestorePost(string id);
+}

SquirrelContract/SquirrelContract/AdapterContracts/ISalaryAdapter.cs

@@ -0,0 +1,10 @@
+using SquirrelContract.AdapterContracts.OperationResponses;
+
+namespace SquirrelContract.AdapterContracts;
+
+public interface ISalaryAdapter
+{
+    SalaryOperationResponse GetListByPeriod(DateTime fromDate, DateTime toDate);
+    SalaryOperationResponse GetListByPeriodByEmployee(DateTime fromDate, DateTime toDate, string employeeId);
+    SalaryOperationResponse CalculateSalary(DateTime date);
+}

SquirrelContract/SquirrelContract/AdapterContracts/ISaleAdapter.cs

@@ -0,0 +1,21 @@
+using SquirrelContract.AdapterContracts.OperationResponses;
+using SquirrelContract.BindingModels;
+
+namespace SquirrelContract.AdapterContracts;
+
+public interface ISaleAdapter
+{
+    SaleOperationResponse GetList(DateTime fromDate, DateTime toDate);
+
+    SaleOperationResponse GetEmployeeList(string id, DateTime fromDate, DateTime toDate);
+
+    SaleOperationResponse GetClientList(string id, DateTime fromDate, DateTime toDate);
+
+    SaleOperationResponse GetCocktailList(string id, DateTime fromDate, DateTime toDate);
+
+    SaleOperationResponse GetElement(string id);
+
+    SaleOperationResponse MakeSale(SaleBindingModel saleModel);
+
+    SaleOperationResponse CancelSale(string id);
+}

SquirrelContract/SquirrelContract/AdapterContracts/ISupplyAdapter.cs

@@ -0,0 +1,15 @@
+using SquirrelContract.BindingModels;
+using SquirrelContract.AdapterContracts.OperationResponses;
+using SquirrelContract.DataModels;
+
+namespace SquirrelContract.AdapterContracts;
+
+public interface ISupplyAdapter
+{
+    SupplyOperationResponse GetAllSuppliesByPeriod(DateTime fromDate, DateTime toDate);
+
+    SupplyOperationResponse GetCocktailList(string id, DateTime fromDate, DateTime toDate);
+    SupplyOperationResponse GetSupplyByData(string data);
+    SupplyOperationResponse InsertSupply(SupplyBindingModel supplyDataModel);
+    SupplyOperationResponse UpdateSupply(SupplyBindingModel supplyDataModel);
+}

SquirrelContract/SquirrelContract/AdapterContracts/IWarehouseAdapter.cs

@@ -0,0 +1,13 @@
+using SquirrelContract.AdapterContracts.OperationResponses;
+using SquirrelContract.BindingModels;
+
+namespace SquirrelContract.AdapterContracts;
+
+public interface IWarehouseAdapter
+{
+    WarehouseOperationResponse GetAllWarehouses();
+    WarehouseOperationResponse GetWarehouseByData(string data);
+    WarehouseOperationResponse InsertWarehouse(WarehouseBindingModel warehouseDataModel);
+    WarehouseOperationResponse UpdateWarehouse(WarehouseBindingModel warehouseDataModel);
+    WarehouseOperationResponse DeleteWarehouse(string id);
+}

SquirrelContract/SquirrelContract/AdapterContracts/OperationResponses/ClientOperationResponse.cs

@@ -0,0 +1,19 @@
+using SquirrelContract.ViewModels;
+using SquirrelContract.Infrastructure;
+
+namespace SquirrelContract.AdapterContracts.OperationResponses;
+
+public class ClientOperationResponse : OperationResponse
+{
+    public static ClientOperationResponse OK(List<ClientViewModel> data) => OK<ClientOperationResponse, List<ClientViewModel>>(data);
+
+    public static ClientOperationResponse OK(ClientViewModel data) => OK<ClientOperationResponse, ClientViewModel>(data);
+
+    public static ClientOperationResponse NoContent() => NoContent<ClientOperationResponse>();
+
+    public static ClientOperationResponse BadRequest(string message) => BadRequest<ClientOperationResponse>(message);
+
+    public static ClientOperationResponse NotFound(string message) => NotFound<ClientOperationResponse>(message);
+
+    public static ClientOperationResponse InternalServerError(string message) => InternalServerError<ClientOperationResponse>(message);
+}

SquirrelContract/SquirrelContract/AdapterContracts/OperationResponses/CocktailOperationResponse.cs

@@ -0,0 +1,21 @@
+using SquirrelContract.ViewModels;
+using SquirrelContract.Infrastructure;
+
+namespace SquirrelContract.AdapterContracts.OperationResponses;
+
+public class CocktailOperationResponse : OperationResponse
+{
+    public static CocktailOperationResponse OK(List<CocktailViewModel> data) => OK<CocktailOperationResponse, List<CocktailViewModel>>(data);
+
+    public static CocktailOperationResponse OK(List<CocktailHistoryViewModel> data) => OK<CocktailOperationResponse, List<CocktailHistoryViewModel>>(data);
+
+    public static CocktailOperationResponse OK(CocktailViewModel data) => OK<CocktailOperationResponse, CocktailViewModel>(data);
+
+    public static CocktailOperationResponse NoContent() => NoContent<CocktailOperationResponse>();
+
+    public static CocktailOperationResponse NotFound(string message) => NotFound<CocktailOperationResponse>(message);
+
+    public static CocktailOperationResponse BadRequest(string message) => BadRequest<CocktailOperationResponse>(message);
+
+    public static CocktailOperationResponse InternalServerError(string message) => InternalServerError<CocktailOperationResponse>(message);
+}

SquirrelContract/SquirrelContract/AdapterContracts/OperationResponses/EmployeeOperationResponse.cs

@@ -0,0 +1,19 @@
+using SquirrelContract.ViewModels;
+using SquirrelContract.Infrastructure;
+
+namespace SquirrelContract.AdapterContracts.OperationResponses;
+
+public class EmployeeOperationResponse : OperationResponse
+{
+    public static EmployeeOperationResponse OK(List<EmployeeViewModel> data) => OK<EmployeeOperationResponse, List<EmployeeViewModel>>(data);
+
+    public static EmployeeOperationResponse OK(EmployeeViewModel data) => OK<EmployeeOperationResponse, EmployeeViewModel>(data);
+
+    public static EmployeeOperationResponse NoContent() => NoContent<EmployeeOperationResponse>();
+
+    public static EmployeeOperationResponse NotFound(string message) => NotFound<EmployeeOperationResponse>(message);
+
+    public static EmployeeOperationResponse BadRequest(string message) => BadRequest<EmployeeOperationResponse>(message);
+
+    public static EmployeeOperationResponse InternalServerError(string message) => InternalServerError<EmployeeOperationResponse>(message);
+}

SquirrelContract/SquirrelContract/AdapterContracts/OperationResponses/PostOperationResponse.cs

@@ -0,0 +1,19 @@
+using SquirrelContract.Infrastructure;
+using SquirrelContract.ViewModels;
+
+namespace SquirrelContract.AdapterContracts.OperationResponses;
+
+public class PostOperationResponse : OperationResponse
+{
+    public static PostOperationResponse OK(List<PostViewModel> data) => OK<PostOperationResponse, List<PostViewModel>>(data);
+
+    public static PostOperationResponse OK(PostViewModel data) => OK<PostOperationResponse, PostViewModel>(data);
+
+    public static PostOperationResponse NoContent() => NoContent<PostOperationResponse>();
+
+    public static PostOperationResponse NotFound(string message) => NotFound<PostOperationResponse>(message);
+
+    public static PostOperationResponse BadRequest(string message) => BadRequest<PostOperationResponse>(message);
+
+    public static PostOperationResponse InternalServerError(string message) => InternalServerError<PostOperationResponse>(message);
+}

SquirrelContract/SquirrelContract/AdapterContracts/OperationResponses/SalaryOperationResponse.cs

@@ -0,0 +1,13 @@
+using SquirrelContract.Infrastructure;
+using SquirrelContract.ViewModels;
+
+namespace SquirrelContract.AdapterContracts.OperationResponses;
+
+public class SalaryOperationResponse : OperationResponse
+{
+    public static SalaryOperationResponse OK(List<SalaryViewModel> data) => OK<SalaryOperationResponse, List<SalaryViewModel>>(data);
+    public static SalaryOperationResponse NoContent() => NoContent<SalaryOperationResponse>();
+    public static SalaryOperationResponse NotFound(string message) => NotFound<SalaryOperationResponse>(message);
+    public static SalaryOperationResponse BadRequest(string message) => BadRequest<SalaryOperationResponse>(message);
+    public static SalaryOperationResponse InternalServerError(string message) => InternalServerError<SalaryOperationResponse>(message);
+}

SquirrelContract/SquirrelContract/AdapterContracts/OperationResponses/SaleOperationResponse.cs

@@ -0,0 +1,19 @@
+using SquirrelContract.ViewModels;
+using SquirrelContract.Infrastructure;
+
+namespace SquirrelContract.AdapterContracts.OperationResponses;
+
+public class SaleOperationResponse : OperationResponse
+{
+    public static SaleOperationResponse OK(List<SaleViewModel> data) => OK<SaleOperationResponse, List<SaleViewModel>>(data);
+
+    public static SaleOperationResponse OK(SaleViewModel data) => OK<SaleOperationResponse, SaleViewModel>(data);
+
+    public static SaleOperationResponse NoContent() => NoContent<SaleOperationResponse>();
+
+    public static SaleOperationResponse NotFound(string message) => NotFound<SaleOperationResponse>(message);
+
+    public static SaleOperationResponse BadRequest(string message) => BadRequest<SaleOperationResponse>(message);
+
+    public static SaleOperationResponse InternalServerError(string message) => InternalServerError<SaleOperationResponse>(message);
+}

SquirrelContract/SquirrelContract/AdapterContracts/OperationResponses/SupplyOperationResponse.cs

@@ -0,0 +1,19 @@
+using SquirrelContract.Infrastructure;
+using SquirrelContract.ViewModels;
+
+namespace SquirrelContract.AdapterContracts.OperationResponses;
+
+public class SupplyOperationResponse : OperationResponse
+{
+    public static SupplyOperationResponse OK(List<SupplyViewModel> data) => OK<SupplyOperationResponse, List<SupplyViewModel>>(data);
+
+    public static SupplyOperationResponse OK(SupplyViewModel data) => OK<SupplyOperationResponse, SupplyViewModel>(data);
+
+    public static SupplyOperationResponse NoContent() => NoContent<SupplyOperationResponse>();
+
+    public static SupplyOperationResponse NotFound(string message) => NotFound<SupplyOperationResponse>(message);
+
+    public static SupplyOperationResponse BadRequest(string message) => BadRequest<SupplyOperationResponse>(message);
+
+    public static SupplyOperationResponse InternalServerError(string message) => InternalServerError<SupplyOperationResponse>(message);
+}

SquirrelContract/SquirrelContract/AdapterContracts/OperationResponses/WarehouseOperationResponse.cs

@@ -0,0 +1,19 @@
+using SquirrelContract.Infrastructure;
+using SquirrelContract.ViewModels;
+
+namespace SquirrelContract.AdapterContracts.OperationResponses;
+
+public class WarehouseOperationResponse : OperationResponse
+{
+    public static WarehouseOperationResponse OK(List<WarehouseViewModel> data) => OK<WarehouseOperationResponse, List<WarehouseViewModel>>(data);
+
+    public static WarehouseOperationResponse OK(WarehouseViewModel data) => OK<WarehouseOperationResponse, WarehouseViewModel>(data);
+
+    public static WarehouseOperationResponse NoContent() => NoContent<WarehouseOperationResponse>();
+
+    public static WarehouseOperationResponse NotFound(string message) => NotFound<WarehouseOperationResponse>(message);
+
+    public static WarehouseOperationResponse BadRequest(string message) => BadRequest<WarehouseOperationResponse>(message);
+
+    public static WarehouseOperationResponse InternalServerError(string message) => InternalServerError<WarehouseOperationResponse>(message);
+}

SquirrelContract/SquirrelContract/BindingModels/ClientBindingModel.cs

@@ -0,0 +1,12 @@
+namespace SquirrelContract.BindingModels;
+
+public class ClientBindingModel
+{
+    public string? Id { get; set; }
+
+    public string? FIO { get; set; }
+
+    public string? PhoneNumber { get; set; }
+
+    public double DiscountSize { get; set; }
+}

SquirrelContract/SquirrelContract/BindingModels/CocktailBindingModel.cs

@@ -0,0 +1,9 @@
+namespace SquirrelContract.BindingModels;
+
+public class CocktailBindingModel
+{
+    public string? Id { get; set; }
+    public string? CocktailName { get; set; }
+    public double Price { get; set; }
+    public string? BaseAlcohol { get; set; }
+}

SquirrelContract/SquirrelContract/BindingModels/EmployeeBindingModel.cs

@@ -0,0 +1,16 @@
+namespace SquirrelContract.BindingModels;
+
+public class EmployeeBindingModel
+{
+    public string? Id { get; set; }
+
+    public string? FIO { get; set; }
+
+    public string? Email { get; set; } 
+
+    public string? PostId { get; set; }
+
+    public DateTime BirthDate { get; set; }
+
+    public DateTime EmploymentDate { get; set; }
+}

SquirrelContract/SquirrelContract/BindingModels/PostBindingModel.cs

@@ -0,0 +1,14 @@
+namespace SquirrelContract.BindingModels;
+
+public class PostBindingModel
+{
+    public string? Id { get; set; }
+
+    public string? PostId => Id;
+
+    public string? PostName { get; set; }
+
+    public string? PostType { get; set; }
+
+    public double Salary { get; set; }
+}

SquirrelContract/SquirrelContract/BindingModels/SaleBindingModel.cs

@@ -0,0 +1,14 @@
+namespace SquirrelContract.BindingModels;
+
+public class SaleBindingModel
+{
+    public string? Id { get; set; }
+
+    public string? EmployeeId { get; set; }
+
+    public string? ClientId { get; set; }
+
+    public int DiscountType { get; set; }
+
+    public List<SaleCocktailBindingModel>? Cocktails { get; set; }
+}

SquirrelContract/SquirrelContract/BindingModels/SaleCocktailBindingModel.cs

@@ -0,0 +1,12 @@
+namespace SquirrelContract.BindingModels;
+
+public class SaleCocktailBindingModel
+{
+    public string? SaleId { get; set; }
+
+    public string? CocktailId { get; set; }
+
+    public int Count { get; set; }
+
+    public double Price { get; set; }
+}

SquirrelContract/SquirrelContract/BindingModels/SupplyBindingModel.cs

@@ -0,0 +1,9 @@
+namespace SquirrelContract.BindingModels;
+
+public class SupplyBindingModel
+{
+    public string? Id { get; set; }
+    public DateTime SupplyDate { get; set; }
+    public int Count { get; set; }
+    public List<SupplyCocktailBindingModel>? Cocktails { get; set; }
+}

SquirrelContract/SquirrelContract/BindingModels/SupplyCocktailBindingModel.cs

@@ -0,0 +1,8 @@
+namespace SquirrelContract.BindingModels;
+
+public class SupplyCocktailBindingModel
+{
+    public string? SupplyId { get; set; }
+    public string? CocktailId { get; set; }
+    public int Count { get; set; }
+}

SquirrelContract/SquirrelContract/BindingModels/WarehouseBindingModel.cs

@@ -0,0 +1,9 @@
+namespace SquirrelContract.BindingModels;
+
+public class WarehouseBindingModel
+{
+    public string? Id { get; set; }
+    public string? Name { get; set; }
+    public int Count { get; set; }
+    public List<WarehouseCocktailBindingModel>? Cocktails { get; set; }
+}

SquirrelContract/SquirrelContract/BindingModels/WarehouseCocktailBindingModel.cs

@@ -0,0 +1,8 @@
+namespace SquirrelContract.BindingModels;
+
+public class WarehouseCocktailBindingModel
+{
+    public string? WarehouseId { get; set; }
+    public string? CocktailId { get; set; }
+    public int Count { get; set; }
+}

SquirrelContract/SquirrelContract/BusinessLogicContracts/IClientBusinessLogicContract.cs

@@ -0,0 +1,16 @@
+using SquirrelContract.DataModels;
+
+namespace SquirrelContract.BusinessLogicContracts;
+
+public interface IClientBusinessLogicContract
+{
+    List<ClientDataModel> GetAllClients();
+
+    ClientDataModel GetClientByData(string data);
+
+    void InsertClient(ClientDataModel clientDataModel);
+
+    void UpdateClient(ClientDataModel clientDataModel);
+
+    void DeleteClient(string id);
+}

SquirrelContract/SquirrelContract/BusinessLogicContracts/ICocktailBusinessLogicContract.cs

@@ -0,0 +1,18 @@
+using SquirrelContract.DataModels;
+
+namespace SquirrelContract.BusinessLogicContracts;
+
+public interface ICocktailBusinessLogicContract
+{
+    List<CocktailDataModel> GetAllCocktails();
+
+    List<CocktailHistoryDataModel> GetCocktailHistoryByCocktail(string productId);
+
+    CocktailDataModel GetCocktailByData(string data);
+
+    void InsertCocktail(CocktailDataModel cocktailDataModel);
+
+    void UpdateCocktail(CocktailDataModel cocktailDataModel);
+
+    void DeleteCocktail(string id);
+}

SquirrelContract/SquirrelContract/BusinessLogicContracts/IEmployeeBusinessLogicContract.cs

@@ -0,0 +1,22 @@
+using SquirrelContract.DataModels;
+
+namespace SquirrelContract.BusinessLogicContracts;
+
+public interface IEmployeeBusinessLogicContract
+{
+    List<EmployeeDataModel> GetAllEmployees(bool onlyActive = true);
+
+    List<EmployeeDataModel> GetAllEmployeesByPost(string employeeId, bool onlyActive = true);
+
+    List<EmployeeDataModel> GetAllEmployeesByBirthDate(DateTime fromDate, DateTime toDate, bool onlyActive = true);
+
+    List<EmployeeDataModel> GetAllEmployeesByEmploymentDate(DateTime fromDate, DateTime toDate, bool onlyActive = true);
+
+    EmployeeDataModel GetEmployeeByData(string data);
+
+    void InsertEmployee(EmployeeDataModel employeeDataModel);
+
+    void UpdateEmployee(EmployeeDataModel employeeDataModel);
+
+    void DeleteEmployee(string id);
+}

SquirrelContract/SquirrelContract/BusinessLogicContracts/IPostBusinessLogicContract.cs

@@ -0,0 +1,20 @@
+using SquirrelContract.DataModels;
+
+namespace SquirrelContract.BusinessLogicContracts;
+
+public interface IPostBusinessLogicContract
+{
+    List<PostDataModel> GetAllPosts();
+
+    List<PostDataModel> GetAllDataOfPost(string postId);
+
+    PostDataModel GetPostByData(string data);
+
+    void InsertPost(PostDataModel postDataModel);
+
+    void UpdatePost(PostDataModel postDataModel);
+
+    void DeletePost(string id);
+
+    void RestorePost(string id);
+}

SquirrelContract/SquirrelContract/BusinessLogicContracts/ISalaryBusinessLogicContract.cs

@@ -0,0 +1,12 @@
+using BarBelochkaContract.DataModels;
+
+namespace SquirrelContract.BusinessLogicContracts;
+
+public interface ISalaryBusinessLogicContract
+{
+    List<SalaryDataModel> GetAllSalariesByPeriod(DateTime fromDate, DateTime toDate);
+
+    List<SalaryDataModel> GetAllSalariesByPeriodByEmployee(DateTime fromDate, DateTime toDate, string employeeId);
+
+    void CalculateSalaryByMounth(DateTime date);
+}

SquirrelContract/SquirrelContract/BusinessLogicContracts/ISaleBusinessLogicContract.cs

@@ -0,0 +1,20 @@
+using SquirrelContract.DataModels;
+
+namespace SquirrelContract.BusinessLogicContracts;
+
+public interface ISaleBusinessLogicContract
+{
+    List<SaleDataModel> GetAllSalesByPeriod(DateTime fromDate, DateTime toDate);
+
+    List<SaleDataModel> GetAllSalesByEmployeeByPeriod(string employeeId, DateTime fromDate, DateTime toDate);
+
+    List<SaleDataModel> GetAllSalesByClientByPeriod(string clientId, DateTime fromDate, DateTime toDate);
+
+    List<SaleDataModel> GetAllSalesByCocktailByPeriod(string cocktailId, DateTime fromDate, DateTime toDate);
+
+    SaleDataModel GetSaleByData(string data);
+
+    void InsertSale(SaleDataModel saleDataModel);
+
+    void CancelSale(string id);
+}

SquirrelContract/SquirrelContract/BusinessLogicContracts/ISupplyBusinessLogicContract.cs

@@ -0,0 +1,17 @@
+using SquirrelContract.DataModels;
+
+namespace SquirrelContract.BusinessLogicContracts;
+
+public interface ISupplyBusinessLogicContract
+{
+    List<SupplyDataModel> GetAllSuppliesByPeriod(DateTime fromDate, DateTime toDate);
+
+    List<SupplyDataModel> GetAllSuppliesByCocktailByPeriod(string cocktailId, DateTime fromDate, DateTime toDate);
+
+    SupplyDataModel GetSupplyByData(string data);
+
+    void InsertSupply(SupplyDataModel supplyDataModel);
+
+    void UpdateSupply(SupplyDataModel supplyDataModel);
+
+}

SquirrelContract/SquirrelContract/BusinessLogicContracts/IWarehouseBusinessLogicContract.cs

@@ -0,0 +1,16 @@
+using SquirrelContract.DataModels;
+
+namespace SquirrelContract.BusinessLogicContracts;
+
+public interface IWarehouseBusinessLogicContract
+{
+    List<WarehouseDataModel> GetAllWarehouses();
+
+    WarehouseDataModel GetWarehouseByData(string data);
+
+    void InsertWarehouse(WarehouseDataModel cocktailDataModel);
+
+    void UpdateWarehouse(WarehouseDataModel cocktailDataModel);
+
+    void DeleteWarehouse(string id);
+}

SquirrelContract/SquirrelContract/DataModels/ClientDataModel.cs

@@ -0,0 +1,32 @@
+using SquirrelContract.Exceptions;
+using SquirrelContract.Extensions;
+using SquirrelContract.Infastructure;
+using System.Text.RegularExpressions;
+
+namespace SquirrelContract.DataModels;
+
+public class ClientDataModel(string id, string fio, string phoneNumber, double discountSize) : IValidation
+{
+    public string Id { get; private set; } = id;
+    public string FIO { get; private set;} = fio;
+    public string PhoneNumber { get; private set;} = phoneNumber;
+    public double DiscountSize { get; private set; } = discountSize;
+
+    public void Validate()
+    {
+        if (Id.IsEmpty())
+            throw new ValidationException("Field Id is empty");
+
+        if (!Id.IsGuid())
+            throw new ValidationException("The value in the field Id is not a unique identifier");
+
+        if (FIO.IsEmpty())
+            throw new ValidationException("Field FIO is empty");
+
+        if (PhoneNumber.IsEmpty())
+            throw new ValidationException("Field PhoneNumber is empty");
+
+        if (!Regex.IsMatch(PhoneNumber, @"^((8|\+7)[\- ]?)?(\(?\d{3}\)?[\- ]?)?[\d\- ]{7,10}$"))
+            throw new ValidationException("Field PhoneNumber is not a phone number");
+    }
+}

SquirrelContract/SquirrelContract/DataModels/CocktailDataModel.cs

@@ -0,0 +1,32 @@
+using SquirrelContract.Enums;
+using SquirrelContract.Exceptions;
+using SquirrelContract.Extensions;
+using SquirrelContract.Infastructure;
+
+namespace SquirrelContract.DataModels;
+
+public class CocktailDataModel(string id, string cocktailName, double price, AlcoholType baseAlcohol) : IValidation
+{
+    public string Id { get; private set; } = id;
+    public string CocktailName { get; private set; } = cocktailName;
+    public double Price { get; private set; } = price;
+    public AlcoholType BaseAlcohol { get; private set; } = baseAlcohol;
+
+    public void Validate()
+    {
+        if (Id.IsEmpty())
+            throw new ValidationException("Field Id is empty");
+
+        if (!Id.IsGuid())
+            throw new ValidationException("The value in the field Id is not a unique identifier");
+
+        if (CocktailName.IsEmpty())
+            throw new ValidationException("Field CocktailName is empty");
+
+        if (Price <= 0)
+            throw new ValidationException("Field Price is less than or equal to 0");
+
+        if (BaseAlcohol == AlcoholType.None)
+            throw new ValidationException("Field BaseAlcohol is empty");
+    }
+}

SquirrelContract/SquirrelContract/DataModels/CocktailHistoryDataModel.cs

@@ -0,0 +1,36 @@
+using SquirrelContract.Exceptions;
+using SquirrelContract.Extensions;
+using SquirrelContract.Infastructure;
+
+namespace SquirrelContract.DataModels;
+
+public class CocktailHistoryDataModel(string cocktailId, double oldPrice) : IValidation
+{
+    private readonly CocktailDataModel? _cocktail;
+
+    public string CocktailId { get; private set; } = cocktailId;
+
+    public double OldPrice { get; private set; } = oldPrice;
+
+    public DateTime ChangeDate { get; private set; } = DateTime.UtcNow;
+
+    public string CocktailName => _cocktail?.CocktailName ?? string.Empty;
+
+    public CocktailHistoryDataModel(string cocktailId, double oldPrice, DateTime changeDate, CocktailDataModel cocktail) : this(cocktailId, oldPrice)
+    {
+        ChangeDate = changeDate;
+        _cocktail = cocktail;
+    }
+
+    public void Validate()
+    {
+        if (CocktailId.IsEmpty())
+            throw new ValidationException("Field CocktailId is empty");
+
+        if (!CocktailId.IsGuid())
+            throw new ValidationException("The value in the field CocktailId is not a unique identifier");
+
+        if (OldPrice <= 0)
+            throw new ValidationException("Field OldPrice is less than or equal to 0");
+    }
+}

SquirrelContract/SquirrelContract/DataModels/EmployeeDataModel.cs

@@ -0,0 +1,67 @@
+using SquirrelContract.Exceptions;
+using SquirrelContract.Extensions;
+using SquirrelContract.Infastructure;
+using System.Text.RegularExpressions;
+
+namespace SquirrelContract.DataModels;
+
+public class EmployeeDataModel(string id, string fio, string email, string postId, DateTime birthDate, DateTime employmentDate, bool isDeleted) : IValidation
+{
+    private readonly PostDataModel? _post;
+
+    public string Id { get; private set; } = id;
+
+    public string FIO { get; private set; } = fio;
+
+    public string Email { get; private set; } = email;
+
+    public string PostId { get; private set; } = postId;
+
+    public DateTime BirthDate { get; private set; } = birthDate;
+
+    public DateTime EmploymentDate { get; private set; } = employmentDate;
+
+    public bool IsDeleted { get; private set; } = isDeleted;
+
+    public string PostName => _post?.PostName ?? string.Empty;
+
+    public EmployeeDataModel(string id, string fio, string email, string postId, DateTime birthDate, DateTime employmentDate, bool isDeleted, PostDataModel post) : this(id, fio, email, postId, birthDate, employmentDate, isDeleted)
+    {
+        _post = post;
+    }
+
+    public EmployeeDataModel(string id, string fio, string email, string postId, DateTime birthDate, DateTime employmentDate) : this(id, fio, email, postId, birthDate, employmentDate, false) { }
+
+    public void Validate()
+    {
+        if (Id.IsEmpty())
+            throw new ValidationException("Field Id is empty");
+
+        if (!Id.IsGuid())
+            throw new ValidationException("The value in the field Id is not a unique identifier");
+
+        if (FIO.IsEmpty())
+            throw new ValidationException("Field FIO is empty");
+
+        if (Email.IsEmpty())
+            throw new ValidationException("Field Email is empty");
+
+        if (!Regex.IsMatch(Email, @"^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$"))
+            throw new ValidationException("Field Email is not a valid email address");
+
+        if (PostId.IsEmpty())
+            throw new ValidationException("Field PostId is empty");
+
+        if (!PostId.IsGuid())
+            throw new ValidationException("The value in the field PostId is not a unique identifier");
+
+        if (BirthDate.Date > DateTime.Now.AddYears(-18).Date)
+            throw new ValidationException($"Only adults can be hired (BirthDate = {BirthDate.ToShortDateString()})");
+
+        if (EmploymentDate.Date < BirthDate.Date)
+            throw new ValidationException("The date of employment cannot be less than the date of birth");
+
+        if ((EmploymentDate - BirthDate).TotalDays / 365 < 18) // EmploymentDate.Year - BirthDate.Year
+            throw new ValidationException($"Only adults can be hired (EmploymentDate - {EmploymentDate.ToShortDateString()}, BirthDate - {BirthDate.ToShortDateString()})");
+    }
+}

SquirrelContract/SquirrelContract/DataModels/PostDataModel.cs

@@ -0,0 +1,35 @@
+using SquirrelContract.Enums;
+using SquirrelContract.Exceptions;
+using SquirrelContract.Extensions;
+using SquirrelContract.Infastructure;
+
+namespace SquirrelContract.DataModels;
+
+public class PostDataModel(string postId, string postName, PostType postType, double salary) : IValidation
+{
+    public string Id { get; private set; } = postId;
+
+    public string PostName { get; private set; } = postName;
+
+    public PostType PostType { get; private set; } = postType;
+
+    public double Salary { get; private set; } = salary;
+
+    public void Validate()
+    {
+        if (Id.IsEmpty())
+            throw new ValidationException("Field Id is empty");
+
+        if (!Id.IsGuid())
+            throw new ValidationException("The value in the field Id is not a unique identifier");
+
+        if (PostName.IsEmpty())
+            throw new ValidationException("Field PostName is empty");
+
+        if (PostType == PostType.None)
+            throw new ValidationException("Field PostType is empty");
+
+        if (Salary <= 0)
+            throw new ValidationException("Field Salary is empty");
+    }
+}

SquirrelContract/SquirrelContract/DataModels/SalaryDataModel.cs

@@ -0,0 +1,36 @@
+using SquirrelContract.DataModels;
+using SquirrelContract.Exceptions;
+using SquirrelContract.Extensions;
+using SquirrelContract.Infastructure;
+
+namespace BarBelochkaContract.DataModels;
+
+public class SalaryDataModel(string employeeId, DateTime salaryDate, double employeeSalary) : IValidation
+{
+    private readonly EmployeeDataModel? _employee;
+
+    public string EmployeeId { get; private set; } = employeeId;
+
+    public DateTime SalaryDate { get; private set; } = salaryDate;
+
+    public double Salary { get; private set; } = employeeSalary;
+
+    public string EmployeeFIO => _employee?.FIO ?? string.Empty;
+
+    public SalaryDataModel(string employeeId, DateTime salaryDate, double employeeSalary, EmployeeDataModel employee) : this(employeeId, salaryDate, employeeSalary)
+    {
+        _employee = employee;
+    }
+
+    public void Validate()
+    {
+        if (EmployeeId.IsEmpty())
+            throw new ValidationException("Field EmployeeId is empty");
+
+        if (!EmployeeId.IsGuid())
+            throw new ValidationException("The value in the field EmployeeId is not a unique identifier");
+
+        if (Salary <= 0)
+            throw new ValidationException("Field Salary is less than or equal to 0");
+    }
+}

SquirrelContract/SquirrelContract/DataModels/SaleCocktailDataModel.cs

@@ -0,0 +1,46 @@
+using SquirrelContract.Exceptions;
+using SquirrelContract.Extensions;
+using SquirrelContract.Infastructure;
+
+namespace SquirrelContract.DataModels;
+
+public class SaleCocktailDataModel(string saleId, string cocktailId, int count, double price) : IValidation
+{
+    private readonly CocktailDataModel? _cocktail;
+
+    public string SaleId { get; private set; } = saleId;
+
+    public string CocktailId { get; private set; } = cocktailId;
+
+    public int Count { get; private set; } = count;
+
+    public double Price { get; private set; } = price;
+
+    public string CocktailName => _cocktail?.CocktailName ?? string.Empty;
+
+    public SaleCocktailDataModel(string saleId, string cocktailId, int count, double price, CocktailDataModel cocktail) : this(saleId, cocktailId, count, price)
+    {
+        _cocktail = cocktail;
+    }
+
+    public void Validate()
+    {
+        if (SaleId.IsEmpty())
+            throw new ValidationException("Field SaleId is empty");
+
+        if (!SaleId.IsGuid())
+            throw new ValidationException("The value in the field SaleId is not a unique identifier");
+
+        if (CocktailId.IsEmpty())
+            throw new ValidationException("Field CocktailId is empty");
+
+        if (!CocktailId.IsGuid())
+            throw new ValidationException("The value in the field CocktailId is not a unique identifier");
+
+        if (Count <= 0)
+            throw new ValidationException("Field Count is less than or equal to 0");
+
+        if (Price <= 0)
+            throw new ValidationException("Field Price is less than or equal to 0");
+    }
+}

SquirrelContract/SquirrelContract/DataModels/SaleDataModel.cs

@@ -0,0 +1,102 @@
+using SquirrelContract.Enums;
+using SquirrelContract.Exceptions;
+using SquirrelContract.Extensions;
+using SquirrelContract.Infastructure;
+
+namespace SquirrelContract.DataModels;
+
+public class SaleDataModel : IValidation
+{
+    private readonly ClientDataModel? _client;
+
+    private readonly EmployeeDataModel? _employee;
+
+    public string Id { get; private set; }
+
+    public string EmployeeId { get; private set; }
+
+    public string? ClientId { get; private set; }
+
+    public DateTime SaleDate { get; private set; } = DateTime.UtcNow;
+
+    public double Sum { get; private set; }
+
+    public DiscountType DiscountType { get; private set; }
+
+    public double Discount { get; private set; }
+
+    public bool IsCancel { get; private set; }
+
+    public List<SaleCocktailDataModel>? Cocktails { get; private set; }
+
+    public string ClientFIO => _client?.FIO ?? string.Empty;
+
+    public string EmployeeFIO => _employee?.FIO ?? string.Empty;
+
+    public SaleDataModel(string id, string employeeId, string? clientId, DiscountType discountType, bool isCancel, List<SaleCocktailDataModel> saleCocktails)
+    {
+        Id = id;
+        EmployeeId = employeeId;
+        ClientId = clientId;
+        DiscountType = discountType;
+        IsCancel = isCancel;
+        Cocktails = saleCocktails;
+        var percent = 0.0;
+        foreach (DiscountType elem in Enum.GetValues<DiscountType>())
+        {
+            if ((elem & discountType) != 0)
+            {
+                switch (elem)
+                {
+                    case DiscountType.None:
+                        break;
+                    case DiscountType.OnSale:
+                        percent += 0.1;
+                        break;
+                    case DiscountType.RegularCustomer:
+                        percent += 0.5;
+                        break;
+                    case DiscountType.Certificate:
+                        percent += 0.3;
+                        break;
+                }
+            }
+        }
+        Sum = Cocktails?.Sum(x => x.Price * x.Count) ?? 0;
+        Discount = Sum * percent;
+    }
+
+    public SaleDataModel(string id, string employeeId, string? clientId, double sum, DiscountType discountType, double discount, bool isCancel, List<SaleCocktailDataModel> saleCocktails, EmployeeDataModel employee, ClientDataModel? client) : this(id, employeeId, clientId, discountType, isCancel, saleCocktails)
+    {
+        Sum = sum;
+        Discount = discount;
+        _employee = employee;
+        _client = client;
+    }
+
+    public SaleDataModel(string id, string employeeId, string? clientId, int discountType, List<SaleCocktailDataModel> cocktails) : this(id, employeeId, clientId, (DiscountType)discountType, false, cocktails) { }
+
+    public void Validate()
+    {
+        if (Id.IsEmpty())
+            throw new ValidationException("Field Id is empty");
+
+        if (!Id.IsGuid())
+            throw new ValidationException("The value in the field Id is not a unique identifier");
+
+        if (EmployeeId.IsEmpty())
+            throw new ValidationException("Field EmployeeId is empty");
+
+        if (!EmployeeId.IsGuid())
+            throw new ValidationException("The value in the field EmployeeId is not a unique identifier");
+
+        if (!ClientId?.IsGuid() ?? !ClientId?.IsEmpty() ?? false)
+            throw new ValidationException("The value in the field ClientId is not a unique identifier");
+
+        if (Sum <= 0)
+            throw new ValidationException("Field Sum is less than or equal to 0");
+
+        if ((Cocktails?.Count ?? 0) == 0)
+            throw new ValidationException("The sale must include cocktails");
+    }
+}

SquirrelContract/SquirrelContract/DataModels/SupplyCocktailDataModel.cs

@@ -0,0 +1,33 @@
+using SquirrelContract.Exceptions;
+using SquirrelContract.Extensions;
+using SquirrelContract.Infastructure;
+using System.ComponentModel;
+
+namespace SquirrelContract.DataModels;
+
+public class SupplyCocktailDataModel(string? supplyId, string? cocktailId, int count) : IValidation
+{
+    public string SupplyId { get; private set; } = supplyId;
+
+    public string CocktailId { get; private set; } = cocktailId;
+
+    public int Count { get; private set; } = count;
+
+    public void Validate()
+    {
+        if (SupplyId.IsEmpty())
+            throw new ValidationException("Field SupplyId is empty");
+
+        if (!SupplyId.IsGuid())
+            throw new ValidationException("The value in the field SupplyId is not a unique identifier");
+
+        if (CocktailId.IsEmpty())
+            throw new ValidationException("Field CocktailId is empty");
+
+        if (!CocktailId.IsGuid())
+            throw new ValidationException("The value in the field CocktailId is not a unique identifier");
+
+        if (Count <= 0)
+            throw new ValidationException("Field Count is less than or equal to 0");
+    }
+}

SquirrelContract/SquirrelContract/DataModels/SupplyDataModel.cs

@@ -0,0 +1,29 @@
+using SquirrelContract.Exceptions;
+using SquirrelContract.Extensions;
+using SquirrelContract.Infastructure;
+
+namespace SquirrelContract.DataModels;
+
+public class SupplyDataModel(string id, DateTime supplyDate, List<SupplyCocktailDataModel> cocktails) : IValidation
+{
+    public string Id { get; private set; } = id;
+
+    public DateTime SupplyDate { get; private set; } = supplyDate;
+
+    public List<SupplyCocktailDataModel> Cocktails { get; private set; } = cocktails;
+
+    public void Validate()
+    {
+        if (Id.IsEmpty())
+            throw new ValidationException("Field Id is empty");
+
+        if (!Id.IsGuid())
+            throw new ValidationException("The value in the field Id is not a unique identifier");
+
+        if (SupplyDate.Date > DateTime.Now)
+            throw new ValidationException($"It is impossible to supply things in the future");
+
+        if ((Cocktails?.Count ?? 0) == 0)
+            throw new ValidationException("The components must include products");
+    }
+}

SquirrelContract/SquirrelContract/DataModels/WarehouseCocktailDataModel.cs

@@ -0,0 +1,32 @@
+using SquirrelContract.Exceptions;
+using SquirrelContract.Extensions;
+using SquirrelContract.Infastructure;
+
+namespace SquirrelContract.DataModels;
+
+public class WarehouseCocktailDataModel(string? warehouseId, string? cocktailId, int count) : IValidation
+{
+    public string WarehouseId { get; private set; } = warehouseId;
+
+    public string CocktailId { get; private set; } = cocktailId;
+
+    public int Count { get; private set; } = count;
+
+    public void Validate()
+    {
+        if (WarehouseId.IsEmpty())
+            throw new ValidationException("Field WarehouseId is empty");
+
+        if (!WarehouseId.IsGuid())
+            throw new ValidationException("The value in the field WarehouseId is not a unique identifier");
+
+        if (CocktailId.IsEmpty())
+            throw new ValidationException("Field CocktailId is empty");
+
+        if (!CocktailId.IsGuid())
+            throw new ValidationException("The value in the field CocktailId is not a unique identifier");
+
+        if (Count <= 0)
+            throw new ValidationException("Field Count is less than or equal to 0");
+    }
+}

SquirrelContract/SquirrelContract/DataModels/WarehouseDataModel.cs

@@ -0,0 +1,30 @@
+using SquirrelContract.Exceptions;
+using SquirrelContract.Extensions;
+using SquirrelContract.Infastructure;
+using System.Xml.Linq;
+
+namespace SquirrelContract.DataModels;
+
+public class WarehouseDataModel(string? id, string name, List<WarehouseCocktailDataModel> cocktails) : IValidation
+{
+    public string Id { get; private set; } = id;
+
+    public string Name { get; private set; } = name;
+
+    public List<WarehouseCocktailDataModel> Cocktails { get; private set; } = cocktails;
+
+    public void Validate()
+    {
+        if (Id.IsEmpty())
+            throw new ValidationException("Field Id is empty");
+
+        if (!Id.IsGuid())
+            throw new ValidationException("The value in the field Id is not a unique identifier");
+
+        if (Name.IsEmpty())
+            throw new ValidationException("Field Name is empty");
+
+        if ((Cocktails?.Count ?? 0) == 0)
+            throw new ValidationException("The cocktails must include drinks");
+    }
+}

SquirrelContract/SquirrelContract/Enums/AlcoholType.cs

@@ -0,0 +1,10 @@
+namespace SquirrelContract.Enums;
+
+public enum AlcoholType
+{
+    None = 0,
+    Vodka = 1, 
+    Whiskey = 2,
+    Wine = 3,
+    Beer = 4
+}

SquirrelContract/SquirrelContract/Enums/DiscountType.cs

@@ -0,0 +1,10 @@
+namespace SquirrelContract.Enums;
+
+[Flags]
+public enum DiscountType
+{
+    None = 0,
+    OnSale = 1,
+    RegularCustomer = 2,
+    Certificate = 4
+}

SquirrelContract/SquirrelContract/Enums/PostType.cs

@@ -0,0 +1,9 @@
+namespace SquirrelContract.Enums;
+
+public enum PostType
+{
+    None = 0,
+    Bartender = 1,
+    Manager = 2,
+    PurchasingSpecialist = 3
+}

SquirrelContract/SquirrelContract/Exceptions/ElementDeletedException.cs

@@ -0,0 +1,6 @@
+namespace SquirrelContract.Exceptions;
+
+public class ElementDeletedException : Exception
+{
+	public ElementDeletedException(string id) : base($"Cannot modify a deleted item (id: {id})") { }
+}

SquirrelContract/SquirrelContract/Exceptions/ElementNotFoundException.cs

@@ -0,0 +1,11 @@
+namespace SquirrelContract.Exceptions;
+
+public class ElementNotFoundException : Exception
+{
+    public string Value { get; private set; }
+
+    public ElementNotFoundException(string value) : base($"Element not found at value = {value}")
+    {
+        Value = value;
+    }
+}

SquirrelContract/SquirrelContract/Exceptions/ExceptionExistException.cs

@@ -0,0 +1,14 @@
+namespace SquirrelContract.Exceptions;
+
+public class ElementExistsException : Exception
+{
+    public string ParamName { get; private set; }
+
+    public string ParamValue { get; private set; }
+
+    public ElementExistsException(string paramName, string paramValue) : base($"There is already an element with value{paramValue} of parameter {paramName}")
+    {
+        ParamName = paramName;
+        ParamValue = paramValue;
+    }
+}

SquirrelContract/SquirrelContract/Exceptions/IncorrectDatesException.cs

@@ -0,0 +1,6 @@
+namespace SquirrelContract.Exceptions;
+
+public class IncorrectDatesException : Exception
+{
+    public IncorrectDatesException(DateTime start, DateTime end) : base($"The end date must be later than the start date.. StartDate: {start:dd.MM.YYYY}. EndDate: {end:dd.MM.YYYY}") { }
+}

SquirrelContract/SquirrelContract/Exceptions/InsufficientStockException.cs

@@ -0,0 +1,5 @@
+namespace SquirrelContract.Exceptions;
+
+public class InsufficientStockException(string message) : Exception(message)
+{
+}

SquirrelContract/SquirrelContract/Exceptions/NullListException.cs

@@ -0,0 +1,6 @@
+namespace SquirrelContract.Exceptions;
+
+public class NullListException : Exception
+{
+    public NullListException() : base("The returned list is null") { }
+}

SquirrelContract/SquirrelContract/Exceptions/StorageException.cs

@@ -0,0 +1,6 @@
+namespace SquirrelContract.Exceptions;
+
+public class StorageException : Exception
+{
+    public StorageException(Exception ex) : base($"Error while working in storage: {ex.Message}", ex) { }
+}

SquirrelContract/SquirrelContract/Exceptions/ValidationException.cs

@@ -0,0 +1,5 @@
+namespace SquirrelContract.Exceptions;
+
+public class ValidationException(string message) : Exception(message)
+{
+}

SquirrelContract/SquirrelContract/Extensions/DateTimeExtensions.cs

@@ -0,0 +1,9 @@
+namespace SquirrelContract.Extensions;
+
+public static class DateTimeExtensions
+{
+    public static bool IsDateNotOlder(this DateTime date, DateTime olderDate)
+    {
+        return date >= olderDate;
+    }
+}

SquirrelContract/SquirrelContract/Extensions/StringExtensions.cs

@@ -0,0 +1,14 @@
+namespace SquirrelContract.Extensions;
+
+public static class StringExtensions
+{
+    public static bool IsEmpty(this string str)
+    {
+        return string.IsNullOrWhiteSpace(str);
+    }
+
+    public static bool IsGuid(this string str)
+    {
+        return Guid.TryParse(str, out _);
+    }
+}

SquirrelContract/SquirrelContract/Infastructure/IConfigurationDatabase.cs

@@ -0,0 +1,6 @@
+namespace SquirrelContract.Infastructure;
+
+public interface IConfigurationDatabase
+{
+    string ConnectionString { get; }
+}

SquirrelContract/SquirrelContract/Infastructure/IValidation.cs

@@ -0,0 +1,6 @@
+namespace SquirrelContract.Infastructure;
+
+public interface IValidation
+{
+    void Validate();
+}

SquirrelContract/SquirrelContract/Infastructure/OperationResponse.cs

@@ -0,0 +1,37 @@
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+using System.Net;
+
+namespace SquirrelContract.Infrastructure;
+
+public class OperationResponse
+{
+	public HttpStatusCode StatusCode { get; set; }
+
+	public object? Result { get; set; }
+
+	public IActionResult GetResponse(HttpRequest request, HttpResponse response)
+	{
+		ArgumentNullException.ThrowIfNull(request);
+		ArgumentNullException.ThrowIfNull(response);
+
+		response.StatusCode = (int)StatusCode;
+
+		if (Result is null)
+		{
+			return new StatusCodeResult((int)StatusCode);
+		}
+
+		return new ObjectResult(Result);
+	}
+
+	protected static TResult OK<TResult, TData>(TData data) where TResult : OperationResponse, new() => new() { StatusCode = HttpStatusCode.OK, Result = data };
+
+	protected static TResult NoContent<TResult>() where TResult : OperationResponse, new() => new() { StatusCode = HttpStatusCode.NoContent };
+
+	protected static TResult BadRequest<TResult>(string? errorMessage = null) where TResult : OperationResponse, new() => new() { StatusCode = HttpStatusCode.BadRequest, Result = errorMessage };
+
+	protected static TResult NotFound<TResult>(string? errorMessage = null) where TResult : OperationResponse, new() => new() { StatusCode = HttpStatusCode.NotFound, Result = errorMessage };
+
+	protected static TResult InternalServerError<TResult>(string? errorMessage = null) where TResult : OperationResponse, new() => new() { StatusCode = HttpStatusCode.InternalServerError, Result = errorMessage };
+}

SquirrelContract/SquirrelContract/SquirrelContract.csproj

@@ -6,4 +6,9 @@
     <Nullable>enable</Nullable>
   </PropertyGroup>
 
+  <ItemGroup>
+    <PackageReference Include="Microsoft.AspNetCore.Mvc.Abstractions" Version="2.3.0" />
+    <PackageReference Include="Microsoft.AspNetCore.Mvc.Core" Version="2.3.0" />
+  </ItemGroup>
+
 </Project>

SquirrelContract/SquirrelContract/StoragesContracts/IClientStorageContract.cs

@@ -0,0 +1,20 @@
+using SquirrelContract.DataModels;
+
+namespace SquirrelContract.StoragesContracts;
+
+public interface IClientStorageContract
+{
+    List<ClientDataModel> GetList();
+
+    ClientDataModel? GetElementById(string id);
+
+    ClientDataModel? GetElementByPhoneNumber(string phoneNumber);
+
+    ClientDataModel? GetElementByFIO(string fio);
+
+    void AddElement(ClientDataModel clientDataModel);
+
+    void UpdElement(ClientDataModel clientDataModel);
+
+    void DelElement(string id);
+}

SquirrelContract/SquirrelContract/StoragesContracts/ICocktailStorageContract.cs

@@ -0,0 +1,15 @@
+using SquirrelContract.DataModels;
+
+namespace SquirrelContract.StoragesContracts;
+
+public interface ICocktailStorageContract
+{
+    List<CocktailDataModel> GetList();
+    List<CocktailHistoryDataModel> GetHistoryByCocktailId(string cocktailId);
+    CocktailDataModel? GetElementById(string id);
+    CocktailDataModel? GetElementByName(string name);
+    void AddElement(CocktailDataModel cocktailDataModel);
+    void UpdElement(CocktailDataModel cocktailDataModel);
+    void DelElement(string id);
+    void ResElement(string id);
+}

SquirrelContract/SquirrelContract/StoragesContracts/IEmployeeStorageContract.cs

@@ -0,0 +1,20 @@
+using SquirrelContract.DataModels;
+
+namespace SquirrelContract.StoragesContracts;
+
+public interface IEmployeeStorageContract
+{
+    List<EmployeeDataModel> GetList(bool onlyActive = true, string? postId = null, DateTime? fromBirthDate = null, DateTime? toBirthDate = null, DateTime? fromEmploymentDate = null, DateTime? toEmploymentDate = null);
+
+    EmployeeDataModel? GetElementById(string id);
+
+    EmployeeDataModel? GetElementByFIO(string fio);
+
+    EmployeeDataModel? GetElementByEmail(string email);
+
+    void AddElement(EmployeeDataModel employeeDataModel);
+
+    void UpdElement(EmployeeDataModel employeeDataModel);
+
+    void DelElement(string id);
+}

SquirrelContract/SquirrelContract/StoragesContracts/IPostStorageContract.cs

@@ -0,0 +1,15 @@
+using SquirrelContract.DataModels;
+
+namespace SquirrelContract.StoragesContracts;
+
+public interface IPostStorageContract
+{
+    List<PostDataModel> GetList();
+    List<PostDataModel> GetPostWithHistory(string postId);
+    PostDataModel? GetElementById(string id);
+    PostDataModel? GetElementByName(string name);
+    void AddElement(PostDataModel postDataModel);
+    void UpdElement(PostDataModel postDataModel);
+    void DelElement(string id);
+    void ResElement(string id);
+}

SquirrelContract/SquirrelContract/StoragesContracts/ISalaryStorageContract.cs

@@ -0,0 +1,10 @@
+using BarBelochkaContract.DataModels;
+
+namespace SquirrelContract.StoragesContracts;
+
+public interface ISalaryStorageContract
+{
+    List<SalaryDataModel> GetList(DateTime? startDate, DateTime? endDate, string? employeeId = null);
+
+    void AddElement(SalaryDataModel salaryDataModel);
+}

SquirrelContract/SquirrelContract/StoragesContracts/ISaleStorageContract.cs

@@ -0,0 +1,14 @@
+using SquirrelContract.DataModels;
+
+namespace SquirrelContract.StoragesContracts;
+
+public interface ISaleStorageContract
+{
+    List<SaleDataModel> GetList(DateTime? startDate = null, DateTime? endDate = null, string? employeeId = null, string? clientId = null, string? cocktailId = null);
+
+    SaleDataModel? GetElementById(string id);
+
+    void AddElement(SaleDataModel saleDataModel);
+
+    void DelElement(string id);
+}

SquirrelContract/SquirrelContract/StoragesContracts/ISupplyStorageContract.cs

@@ -0,0 +1,11 @@
+using SquirrelContract.DataModels;
+
+namespace SquirrelContract.StoragesContracts;
+
+public interface ISupplyStorageContract
+{
+    List<SupplyDataModel> GetList(DateTime? startDate = null, DateTime? endDate = null, string? cocktailId = null);
+    SupplyDataModel? GetElementById(string id);
+    void AddElement(SupplyDataModel warehouseDataModel);
+    void UpdateElement(SupplyDataModel warehouseDataModel);
+}

SquirrelContract/SquirrelContract/StoragesContracts/IWarehouseStorageContract.cs

@@ -0,0 +1,15 @@
+using SquirrelContract.DataModels;
+
+namespace SquirrelContract.StoragesContracts;
+
+public interface IWarehouseStorageContract
+{
+    List<WarehouseDataModel> GetList();
+    WarehouseDataModel? GetElementByName(string name);
+    WarehouseDataModel? GetElementById(string id);
+    void AddElement(WarehouseDataModel warehouseDataModel);
+    void UpdElement(WarehouseDataModel warehouseDataModel);
+    void UpdWarehouseOnSupply(string warehouseId, string cocktailId, int count);
+    void DelElement(string id);
+    bool CheckCocktails(SaleDataModel saleDataModel);
+}

SquirrelContract/SquirrelContract/ViewModels/ClientViewModel.cs

@@ -0,0 +1,12 @@
+namespace SquirrelContract.ViewModels;
+
+public class ClientViewModel
+{
+    public required string Id { get; set; }
+
+    public required string FIO { get; set; }
+
+    public required string PhoneNumber { get; set; }
+
+    public double DiscountSize { get; set; }
+}

SquirrelContract/SquirrelContract/ViewModels/CocktailHistoryViewModel.cs

@@ -0,0 +1,10 @@
+namespace SquirrelContract.ViewModels;
+
+public class CocktailHistoryViewModel
+{
+    public required string CocktailName { get; set; }
+
+    public double OldPrice { get; set; }
+
+    public DateTime ChangeDate { get; set; }
+}

SquirrelContract/SquirrelContract/ViewModels/CocktailViewModel.cs

@@ -0,0 +1,13 @@
+namespace SquirrelContract.ViewModels;
+
+public class CocktailViewModel
+{
+    public required string Id { get; set; }
+
+    public required string CocktailName { get; set; }
+
+    public required string BaseAlcohol { get; set; }
+
+    public double Price { get; set; }
+
+}

SquirrelContract/SquirrelContract/ViewModels/EmployeeViewModel.cs

@@ -0,0 +1,20 @@
+namespace SquirrelContract.ViewModels;
+
+public class EmployeeViewModel
+{
+    public required string Id { get; set; }
+
+    public required string FIO { get; set; }
+
+    public string Email {  get; set; }
+
+    public required string PostId { get; set; }
+
+    public required string PostName { get; set; }
+
+    public bool IsDeleted { get; set; }
+
+    public DateTime BirthDate { get; set; }
+
+    public DateTime EmploymentDate { get; set; }
+}

SquirrelContract/SquirrelContract/ViewModels/PostViewModel.cs

@@ -0,0 +1,12 @@
+namespace SquirrelContract.ViewModels;
+
+public class PostViewModel
+{
+    public required string Id { get; set; }
+
+    public required string PostName { get; set; }
+
+    public required string PostType { get; set; }
+
+    public double Salary { get; set; }
+}

SquirrelContract/SquirrelContract/ViewModels/SalaryViewModel.cs

@@ -0,0 +1,9 @@
+namespace SquirrelContract.ViewModels;
+
+public class SalaryViewModel
+{
+    public required string EmployeeId { get; set; }
+    public required string EmployeeFIO { get; set; }
+    public DateTime SalaryDate { get; set; }
+    public double Salary { get; set; }
+}

SquirrelContract/SquirrelContract/ViewModels/SaleCocktailViewModel.cs

@@ -0,0 +1,12 @@
+namespace SquirrelContract.ViewModels;
+
+public class SaleCocktailViewModel
+{
+    public required string CocktailId { get; set; }
+
+    public required string CocktailName { get; set; }
+
+    public int Count { get; set; }
+
+    public double Price { get; set; }
+}

SquirrelContract/SquirrelContract/ViewModels/SaleViewModel.cs

@@ -0,0 +1,26 @@
+namespace SquirrelContract.ViewModels;
+
+public class SaleViewModel
+{
+    public required string Id { get; set; }
+
+    public required string EmployeeId { get; set; }
+
+    public required string EmployeeFIO { get; set; }
+
+    public string? ClientId { get; set; }
+
+    public string? ClientFIO { get; set; }
+
+    public DateTime SaleDate { get; set; }
+
+    public double Sum { get; set; }
+
+    public required string DiscountType { get; set; }
+
+    public double Discount { get; set; }
+
+    public bool IsCancel { get; set; }
+
+    public required List<SaleCocktailViewModel> Cocktails { get; set; }
+}

SquirrelContract/SquirrelContract/ViewModels/SupplyCocktailViewModel.cs

@@ -0,0 +1,8 @@
+namespace SquirrelContract.ViewModels;
+
+public class SupplyCocktailViewModel
+{
+    public required string SupplyId { get; set; }
+    public required string CocktailId { get; set; }
+    public int Count { get; set; }
+}

SquirrelContract/SquirrelContract/ViewModels/SupplyViewModel.cs

@@ -0,0 +1,9 @@
+namespace SquirrelContract.ViewModels;
+
+public class SupplyViewModel
+{
+    public required string Id { get; set; }
+    public DateTime SupplyDate { get; set; }
+    public int Count { get; set; }
+    public required List<SupplyCocktailViewModel> Cocktails { get; set; }
+}

SquirrelContract/SquirrelContract/ViewModels/WarehouseCocktailViewModel.cs

@@ -0,0 +1,8 @@
+namespace SquirrelContract.ViewModels;
+
+public class WarehouseCocktailViewModel
+{
+    public required string WarehouseId { get; set; }
+    public required string CocktailId { get; set; }
+    public int Count { get; set; }
+}

SquirrelContract/SquirrelContract/ViewModels/WarehouseViewModel.cs

@@ -0,0 +1,9 @@
+namespace SquirrelContract.ViewModels;
+
+public class WarehouseViewModel
+{
+    public required string Id { get; set; }
+    public required string Name { get; set; }
+    public required int Count { get; set; }
+    public required List<WarehouseCocktailViewModel> Cocktails { get; set; }
+}

SquirrelContract/SquirrelDatabase/Implementations/ClientStorageContract.cs

@@ -0,0 +1,149 @@
+using AutoMapper;
+using Microsoft.EntityFrameworkCore;
+using Npgsql;
+using SquirrelContract.DataModels;
+using SquirrelContract.Exceptions;
+using SquirrelContract.StoragesContracts;
+using SquirrelDatabase.Models;
+using System;
+
+namespace SquirrelDatabase.Implementations;
+
+public class ClientStorageContract : IClientStorageContract
+{
+    private readonly SquirrelDbContext _dbContext;
+    private readonly Mapper _mapper;
+
+    public ClientStorageContract(SquirrelDbContext squirrelDbContext)
+    {
+        _dbContext = squirrelDbContext;
+        var config = new MapperConfiguration(cfg =>
+        {
+            cfg.AddMaps(typeof(SquirrelDbContext).Assembly);
+        });
+        _mapper = new Mapper(config);
+    }
+
+    public List<ClientDataModel> GetList()
+    {
+        try
+        {
+            return [.. _dbContext.Clients.Select(x => _mapper.Map<ClientDataModel>(x))];
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public ClientDataModel? GetElementById(string id)
+    {
+        try
+        {
+            return _mapper.Map<ClientDataModel>(GetClientById(id));
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public ClientDataModel? GetElementByFIO(string fio)
+    {
+        try
+        {
+            return _mapper.Map<ClientDataModel>(_dbContext.Clients.FirstOrDefault(x => x.FIO == fio));
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public ClientDataModel? GetElementByPhoneNumber(string phoneNumber)
+    {
+        try
+        {
+            return _mapper.Map<ClientDataModel>(_dbContext.Clients.FirstOrDefault(x => x.PhoneNumber == phoneNumber));
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public void AddElement(ClientDataModel clientDataModel)
+    {
+        try
+        {
+            _dbContext.Clients.Add(_mapper.Map<Client>(clientDataModel));
+            _dbContext.SaveChanges();
+        }
+        catch (InvalidOperationException ex) when (ex.TargetSite?.Name == "ThrowIdentityConflict")
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new ElementExistsException("Id", clientDataModel.Id);
+        }
+        catch (DbUpdateException ex) when (ex.InnerException is PostgresException { ConstraintName: "IX_Clients_PhoneNumber" })
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new ElementExistsException("PhoneNumber", clientDataModel.PhoneNumber);
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public void UpdElement(ClientDataModel clientDataModel)
+    {
+        try
+        {
+            var element = GetClientById(clientDataModel.Id) ?? throw new ElementNotFoundException(clientDataModel.Id);
+            _dbContext.Clients.Update(_mapper.Map(clientDataModel, element));
+            _dbContext.SaveChanges();
+        }
+        catch (ElementNotFoundException)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw;
+        }
+        catch (DbUpdateException ex) when (ex.InnerException is PostgresException { ConstraintName: "IX_Clients_PhoneNumber" })
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new ElementExistsException("PhoneNumber", clientDataModel.PhoneNumber);
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public void DelElement(string id)
+    {
+        try
+        {
+            var element = GetClientById(id) ?? throw new ElementNotFoundException(id);
+            _dbContext.Clients.Remove(element);
+            _dbContext.SaveChanges();
+        }
+        catch (ElementNotFoundException)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw;
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    private Client? GetClientById(string id) => _dbContext.Clients.FirstOrDefault(x => x.Id == id);
+}

SquirrelContract/SquirrelDatabase/Implementations/CocktailStorageContract.cs

@@ -0,0 +1,179 @@
+using AutoMapper;
+using Microsoft.EntityFrameworkCore;
+using Npgsql;
+using SquirrelContract.DataModels;
+using SquirrelContract.Exceptions;
+using SquirrelContract.StoragesContracts;
+using SquirrelDatabase.Models;
+
+namespace SquirrelDatabase.Implementations;
+
+public class CocktailStorageContract : ICocktailStorageContract
+{
+    private readonly SquirrelDbContext _dbContext;
+    private readonly Mapper _mapper;
+
+    public CocktailStorageContract(SquirrelDbContext dbContext)
+    {
+        _dbContext = dbContext;
+        var config = new MapperConfiguration(cfg =>
+        {
+            cfg.CreateMap<Cocktail, CocktailDataModel>();
+            cfg.CreateMap<CocktailDataModel, Cocktail>();
+            cfg.CreateMap<CocktailHistory, CocktailHistoryDataModel>();
+        });
+        _mapper = new Mapper(config);
+    }
+
+    public List<CocktailDataModel> GetList()
+    {
+        try
+        {
+            return [.. _dbContext.Cocktails.Select(x => _mapper.Map<CocktailDataModel>(x))];
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public List<CocktailHistoryDataModel> GetHistoryByCocktailId(string cocktailId)
+    {
+        try
+        {
+            return [.. _dbContext.CocktailHistories.Include(x => x.Cocktail).Where(x => x.CocktailId == cocktailId).OrderByDescending(x => x.ChangeDate).Select(x => _mapper.Map<CocktailHistoryDataModel>(x))];
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public CocktailDataModel? GetElementById(string id)
+    {
+        try
+        {
+            return _mapper.Map<CocktailDataModel>(GetCocktailById(id));
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public CocktailDataModel? GetElementByName(string name)
+    {
+        try
+        {
+            return _mapper.Map<CocktailDataModel>(_dbContext.Cocktails.FirstOrDefault(x => x.CocktailName == name));
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public void AddElement(CocktailDataModel cocktailDataModel)
+    {
+        try
+        {
+            _dbContext.Cocktails.Add(_mapper.Map<Cocktail>(cocktailDataModel));
+            _dbContext.SaveChanges();
+        }
+        catch (InvalidOperationException ex) when (ex.TargetSite?.Name == "ThrowIdentityConflict")
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new ElementExistsException("Id", cocktailDataModel.Id);
+        }
+        catch (DbUpdateException ex) when (ex.InnerException is PostgresException { ConstraintName: "IX_Cocktails_CocktailName" })
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new ElementExistsException("CocktailName", cocktailDataModel.CocktailName);
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public void UpdElement(CocktailDataModel cocktailDataModel)
+    {
+        try
+        {
+            var transaction = _dbContext.Database.BeginTransaction();
+            try
+            {
+                var element = GetCocktailById(cocktailDataModel.Id) ?? throw new ElementNotFoundException(cocktailDataModel.Id);
+                if (element.Price != cocktailDataModel.Price)
+                {
+                    _dbContext.CocktailHistories.Add(new CocktailHistory() { CocktailId = element.Id, OldPrice = element.Price });
+                    _dbContext.SaveChanges();
+                }
+                _dbContext.Cocktails.Update(_mapper.Map(cocktailDataModel, element));
+                _dbContext.SaveChanges();
+                transaction.Commit();
+            }
+            catch
+            {
+                transaction.Rollback();
+                throw;
+            }
+        }
+        catch (DbUpdateException ex) when (ex.InnerException is PostgresException { ConstraintName: "IX_Cocktails_CocktailName" })
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new ElementExistsException("CocktailName", cocktailDataModel.CocktailName);
+        }
+        catch (Exception ex) when (ex is ElementDeletedException || ex is ElementNotFoundException)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw;
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public void DelElement(string id)
+    {
+        try
+        {
+            var element = GetCocktailById(id) ?? throw new ElementNotFoundException(id);
+            _dbContext.Cocktails.Remove(element);
+            _dbContext.SaveChanges();
+        }
+        catch (ElementNotFoundException)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw;
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public void ResElement(string id)
+    {
+        try
+        {
+            var element = GetCocktailById(id) ?? throw new ElementNotFoundException(id);
+            _dbContext.SaveChanges();
+        }
+        catch
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw;
+        }
+    }
+
+    private Cocktail? GetCocktailById(string id) => _dbContext.Cocktails.FirstOrDefault(x => x.Id == id);
+}

SquirrelContract/SquirrelDatabase/Implementations/EmployeeStorageContract.cs

@@ -0,0 +1,163 @@
+using AutoMapper;
+using SquirrelContract.DataModels;
+using SquirrelContract.Exceptions;
+using SquirrelContract.StoragesContracts;
+using SquirrelDatabase.Models;
+
+namespace SquirrelDatabase.Implementations;
+
+public class EmployeeStorageContract : IEmployeeStorageContract
+{
+    private readonly SquirrelDbContext _dbContext;
+    private readonly Mapper _mapper;
+
+    public EmployeeStorageContract(SquirrelDbContext dbContext)
+    {
+        _dbContext = dbContext;
+        var config = new MapperConfiguration(cfg =>
+        {
+            cfg.CreateMap<Post, PostDataModel>()
+                .ForMember(x => x.Id, x => x.MapFrom(src => src.PostId));
+            cfg.CreateMap<Employee, EmployeeDataModel>();
+            cfg.CreateMap<EmployeeDataModel, Employee>();
+        });
+        _mapper = new Mapper(config);
+    }
+
+    public List<EmployeeDataModel> GetList(bool onlyActive = true, string? postId = null, DateTime? fromBirthDate = null, DateTime? toBirthDate = null, DateTime? fromEmploymentDate = null, DateTime? toEmploymentDate = null)
+    {
+        try
+        {
+            var query = _dbContext.Employees.AsQueryable();
+            if (onlyActive)
+            {
+                query = query.Where(x => !x.IsDeleted);
+            }
+            if (postId is not null)
+            {
+                query = query.Where(x => x.PostId == postId);
+            }
+            if (fromBirthDate is not null && toBirthDate is not null)
+            {
+                query = query.Where(x => x.BirthDate >= DateTime.SpecifyKind(fromBirthDate ?? DateTime.UtcNow, DateTimeKind.Utc) && x.BirthDate <= DateTime.SpecifyKind(toBirthDate ?? DateTime.UtcNow, DateTimeKind.Utc));
+            }
+            if (fromEmploymentDate is not null && toEmploymentDate is not null)
+            {
+                query = query.Where(x => x.EmploymentDate >= DateTime.SpecifyKind(fromEmploymentDate ?? DateTime.UtcNow, DateTimeKind.Utc) && x.EmploymentDate <= DateTime.SpecifyKind(toEmploymentDate ?? DateTime.UtcNow, DateTimeKind.Utc));
+            }
+            return [.. JoinPost(query).Select(x => _mapper.Map<EmployeeDataModel>(x))];
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public EmployeeDataModel? GetElementById(string id)
+    {
+        try
+        {
+            return _mapper.Map<EmployeeDataModel>(GetEmployeeById(id));
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public EmployeeDataModel? GetElementByFIO(string fio)
+    {
+        try
+        {
+            return _mapper.Map<EmployeeDataModel>(AddPost(_dbContext.Employees.FirstOrDefault(x => x.FIO == fio && !x.IsDeleted)));
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public EmployeeDataModel? GetElementByEmail(string email)
+    {
+        try
+        {
+            return _mapper.Map<EmployeeDataModel>(AddPost(_dbContext.Employees.FirstOrDefault(x => x.Email == email && !x.IsDeleted)));
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public void AddElement(EmployeeDataModel employeeDataModel)
+    {
+        try
+        {
+            _dbContext.Employees.Add(_mapper.Map<Employee>(employeeDataModel));
+            _dbContext.SaveChanges();
+        }
+        catch (InvalidOperationException ex) when (ex.TargetSite?.Name == "ThrowIdentityConflict")
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new ElementExistsException("Id", employeeDataModel.Id);
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public void UpdElement(EmployeeDataModel employeeDataModel)
+    {
+        try
+        {
+            var element = GetEmployeeById(employeeDataModel.Id) ?? throw new ElementNotFoundException(employeeDataModel.Id);
+            _dbContext.Employees.Update(_mapper.Map(employeeDataModel, element));
+            _dbContext.SaveChanges();
+        }
+        catch (ElementNotFoundException)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw;
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public void DelElement(string id)
+    {
+        try
+        {
+            var element = GetEmployeeById(id) ?? throw new ElementNotFoundException(id);
+            element.IsDeleted = true;
+            _dbContext.SaveChanges();
+        }
+        catch (ElementNotFoundException)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw;
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    private Employee? GetEmployeeById(string id) => AddPost(_dbContext.Employees.FirstOrDefault(x => x.Id == id && !x.IsDeleted));
+
+    private IQueryable<Employee> JoinPost(IQueryable<Employee> query)
+        => query.GroupJoin(_dbContext.Posts.Where(x => x.IsActual), x => x.PostId, y => y.PostId, (x, y) => new { Employee = x, Post = y })
+                .SelectMany(xy => xy.Post.DefaultIfEmpty(), (x, y) => x.Employee.AddPost(y));
+
+    private Employee? AddPost(Employee? employee)
+        => employee?.AddPost(_dbContext.Posts.FirstOrDefault(x => x.PostId == employee.PostId && x.IsActual));
+}

SquirrelContract/SquirrelDatabase/Implementations/PostStorageContract.cs

@@ -0,0 +1,185 @@
+using AutoMapper;
+using Microsoft.EntityFrameworkCore;
+using Npgsql;
+using SquirrelContract.DataModels;
+using SquirrelContract.Exceptions;
+using SquirrelContract.StoragesContracts;
+using SquirrelDatabase.Models;
+
+namespace SquirrelDatabase.Implementations;
+
+public class PostStorageContract : IPostStorageContract
+{
+    private readonly SquirrelDbContext _dbContext;
+    private readonly Mapper _mapper;
+
+    public PostStorageContract(SquirrelDbContext dbContext)
+    {
+        _dbContext = dbContext;
+        var config = new MapperConfiguration(cfg =>
+        {
+            cfg.CreateMap<Post, PostDataModel>()
+                .ForMember(x => x.Id, x => x.MapFrom(src => src.PostId));
+            cfg.CreateMap<PostDataModel, Post>()
+                .ForMember(x => x.Id, x => x.Ignore())
+                .ForMember(x => x.PostId, x => x.MapFrom(src => src.Id))
+                .ForMember(x => x.IsActual, x => x.MapFrom(src => true))
+                .ForMember(x => x.ChangeDate, x => x.MapFrom(src => DateTime.UtcNow));
+        });
+        _mapper = new Mapper(config);
+    }
+
+    public List<PostDataModel> GetList()
+    {
+        try
+        {
+            return [.. _dbContext.Posts.Select(x => _mapper.Map<PostDataModel>(x))];
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public List<PostDataModel> GetPostWithHistory(string postId)
+    {
+        try
+        {
+            return [.. _dbContext.Posts.Where(x => x.PostId == postId).Select(x => _mapper.Map<PostDataModel>(x))];
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public PostDataModel? GetElementById(string id)
+    {
+        try
+        {
+            return _mapper.Map<PostDataModel>(_dbContext.Posts.FirstOrDefault(x => x.PostId == id && x.IsActual));
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public PostDataModel? GetElementByName(string name)
+    {
+        try
+        {
+            return _mapper.Map<PostDataModel>(_dbContext.Posts.FirstOrDefault(x => x.PostName == name && x.IsActual));
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public void AddElement(PostDataModel postDataModel)
+    {
+        try
+        {
+            _dbContext.Posts.Add(_mapper.Map<Post>(postDataModel));
+            _dbContext.SaveChanges();
+        }
+        catch (DbUpdateException ex) when (ex.InnerException is PostgresException { ConstraintName: "IX_Posts_PostName_IsActual" })
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new ElementExistsException("PostName", postDataModel.PostName);
+        }
+        catch (DbUpdateException ex) when (ex.InnerException is PostgresException { ConstraintName: "IX_Posts_PostId_IsActual" })
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new ElementExistsException("PostId", postDataModel.Id);
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public void UpdElement(PostDataModel postDataModel)
+    {
+        try
+        {
+            var transaction = _dbContext.Database.BeginTransaction();
+            try
+            {
+                var element = GetPostById(postDataModel.Id) ?? throw new ElementNotFoundException(postDataModel.Id);
+                if (!element.IsActual)
+                {
+                    throw new ElementDeletedException(postDataModel.Id);
+                }
+                element.IsActual = false;
+                _dbContext.SaveChanges();
+                var newElement = _mapper.Map<Post>(postDataModel);
+                _dbContext.Posts.Add(newElement);
+                _dbContext.SaveChanges();
+                transaction.Commit();
+            }
+            catch
+            {
+                transaction.Rollback();
+                throw;
+            }
+        }
+        catch (DbUpdateException ex) when (ex.InnerException is PostgresException { ConstraintName: "IX_Posts_PostName_IsActual" })
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new ElementExistsException("PostName", postDataModel.PostName);
+        }
+        catch (Exception ex) when (ex is ElementDeletedException || ex is ElementNotFoundException)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw;
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public void DelElement(string id)
+    {
+        try
+        {
+            var element = GetPostById(id) ?? throw new ElementNotFoundException(id);
+            if (!element.IsActual)
+            {
+                throw new ElementDeletedException(id);
+            }
+            element.IsActual = false;
+            _dbContext.SaveChanges();
+        }
+        catch
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw;
+        }
+    }
+
+    public void ResElement(string id)
+    {
+        try
+        {
+            var element = GetPostById(id) ?? throw new ElementNotFoundException(id);
+            element.IsActual = true;
+            _dbContext.SaveChanges();
+        }
+        catch
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw;
+        }
+    }
+
+    private Post? GetPostById(string id) => _dbContext.Posts.Where(x => x.PostId == id).OrderByDescending(x => x.ChangeDate).FirstOrDefault();
+}

SquirrelContract/SquirrelDatabase/Implementations/SalaryStorageContract.cs

@@ -0,0 +1,62 @@
+using AutoMapper;
+using BarBelochkaContract.DataModels;
+using Microsoft.EntityFrameworkCore;
+using SquirrelContract.DataModels;
+using SquirrelContract.Exceptions;
+using SquirrelContract.StoragesContracts;
+using SquirrelDatabase.Models;
+
+namespace SquirrelDatabase.Implementations;
+
+public class SalaryStorageContract : ISalaryStorageContract
+{
+    private readonly SquirrelDbContext _dbContext;
+    private readonly Mapper _mapper;
+
+    public SalaryStorageContract(SquirrelDbContext dbContext)
+    {
+        _dbContext = dbContext;
+        var config = new MapperConfiguration(cfg =>
+        {
+            cfg.CreateMap<Employee, EmployeeDataModel>();
+            cfg.CreateMap<Salary, SalaryDataModel>();
+            cfg.CreateMap<SalaryDataModel, Salary>()
+                .ForMember(dest => dest.EmployeeSalary, opt => opt.MapFrom(src => src.Salary));
+        });
+        _mapper = new Mapper(config);
+    }
+
+    public List<SalaryDataModel> GetList(DateTime? startDate, DateTime? endDate, string? employeeId = null)
+    {
+        try
+        {
+            var query = _dbContext.Salaries.Include(d => d.Employee).AsQueryable();
+            if (startDate.HasValue)
+                query = query.Where(x => x.SalaryDate >= DateTime.SpecifyKind(startDate ?? DateTime.UtcNow, DateTimeKind.Utc));
+            if (endDate.HasValue)
+                query = query.Where(x => x.SalaryDate <= DateTime.SpecifyKind(endDate ?? DateTime.UtcNow, DateTimeKind.Utc));
+            if (employeeId != null)
+                query = query.Where(x => x.EmployeeId == employeeId);
+            return [.. query.Select(x => _mapper.Map<SalaryDataModel>(x))];
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public void AddElement(SalaryDataModel salaryDataModel)
+    {
+        try
+        {
+            _dbContext.Salaries.Add(_mapper.Map<Salary>(salaryDataModel));
+            _dbContext.SaveChanges();
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+}

SquirrelContract/SquirrelDatabase/Implementations/SaleStorageContract.cs

@@ -0,0 +1,120 @@
+using AutoMapper;
+using Microsoft.EntityFrameworkCore;
+using SquirrelContract.DataModels;
+using SquirrelContract.Exceptions;
+using SquirrelContract.StoragesContracts;
+using SquirrelDatabase.Models;
+using System;
+using static System.Runtime.InteropServices.JavaScript.JSType;
+
+namespace SquirrelDatabase.Implementations;
+
+public class SaleStorageContract : ISaleStorageContract
+{
+    private readonly SquirrelDbContext _dbContext;
+    private readonly Mapper _mapper;
+
+    public SaleStorageContract(SquirrelDbContext dbContext)
+    {
+        _dbContext = dbContext;
+        var config = new MapperConfiguration(cfg =>
+        {            
+            cfg.CreateMap<Client, ClientDataModel>();
+            cfg.CreateMap<Cocktail, CocktailDataModel>();
+            cfg.CreateMap<Employee, EmployeeDataModel>();
+            cfg.CreateMap<SaleCocktail, SaleCocktailDataModel>();
+            cfg.CreateMap<SaleCocktailDataModel, SaleCocktail>()
+                    .ForMember(x => x.Cocktail, x => x.Ignore());
+            cfg.CreateMap<Sale, SaleDataModel>();
+            cfg.CreateMap<SaleDataModel, Sale>()
+                .ForMember(x => x.IsCancel, x => x.MapFrom(src => false))
+                .ForMember(x => x.SaleCocktails, x => x.MapFrom(src => src.Cocktails))
+                .ForMember(x => x.Employee, x => x.Ignore())
+                .ForMember(x => x.Client, x => x.Ignore());
+        });
+        _mapper = new Mapper(config);
+    }
+
+    public List<SaleDataModel> GetList(DateTime? startDate = null, DateTime? endDate = null, string? employeeId = null, string? clientId = null, string? cocktailId = null)
+    {
+        try
+        {
+            var query = _dbContext.Sales
+                .Include(r => r.Employee)
+                .Include(r => r.Client)
+                .Include(r => r.SaleCocktails)!
+                .ThenInclude(d => d.Cocktail)
+                .AsQueryable();
+            if (startDate.HasValue)
+                query = query.Where(x => x.SaleDate >= DateTime.SpecifyKind(startDate ?? DateTime.UtcNow, DateTimeKind.Utc));
+            if (endDate.HasValue)
+                query = query.Where(x => x.SaleDate <= DateTime.SpecifyKind(endDate ?? DateTime.UtcNow, DateTimeKind.Utc));
+            if (employeeId != null)
+                query = query.Where(x => x.EmployeeId == employeeId);
+            if (clientId != null)
+                query = query.Where(x => x.ClientId == clientId);
+            if (cocktailId != null)
+                query = query.Where(x => x.SaleCocktails!.Any(y => y.CocktailId == cocktailId));
+            var s = query.ToList();
+            return [.. query.Select(x => _mapper.Map<SaleDataModel>(x))];
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public SaleDataModel? GetElementById(string id)
+    {
+        try
+        {
+            return _mapper.Map<SaleDataModel>(GetSaleById(id));
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public void AddElement(SaleDataModel saleDataModel)
+    {
+        try
+        {
+            _dbContext.Sales.Add(_mapper.Map<Sale>(saleDataModel));
+            _dbContext.SaveChanges();
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public void DelElement(string id)
+    {
+        try
+        {
+            var element = GetSaleById(id) ?? throw new ElementNotFoundException(id);
+            if (element.IsCancel)
+            {
+                throw new ElementDeletedException(id);
+            }
+            element.IsCancel = true;
+            _dbContext.SaveChanges();
+        }
+        catch (Exception ex) when (ex is ElementDeletedException || ex is ElementNotFoundException)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw;
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    private Sale? GetSaleById(string id) => _dbContext.Sales.Include(x => x.Client).Include(x => x.Employee).Include(x => x.SaleCocktails)!.ThenInclude(x => x.Cocktail).FirstOrDefault(x => x.Id == id);
+}

SquirrelContract/SquirrelDatabase/Implementations/SupplyStorageContract.cs

@@ -0,0 +1,100 @@
+using AutoMapper;
+using Microsoft.EntityFrameworkCore;
+using SquirrelContract.DataModels;
+using SquirrelContract.Exceptions;
+using SquirrelContract.StoragesContracts;
+using SquirrelDatabase.Models;
+using System;
+
+namespace SquirrelDatabase.Implementations;
+
+public class SupplyStorageContract : ISupplyStorageContract
+{
+    private readonly SquirrelDbContext _dbContext;
+    private readonly IMapper _mapper;
+
+    public SupplyStorageContract(SquirrelDbContext dbContext)
+    {
+        _dbContext = dbContext;
+        var config = new MapperConfiguration(cfg =>
+        {
+            cfg.CreateMap<SupplyCocktail, SupplyCocktailDataModel>();
+            cfg.CreateMap<SupplyCocktailDataModel, SupplyCocktail>();
+            cfg.CreateMap<Supply, SupplyDataModel>();
+            cfg.CreateMap<SupplyDataModel, Supply>()
+                .ForMember(x => x.Cocktails, x => x.MapFrom(src => src.Cocktails));
+        });
+        _mapper = new Mapper(config);
+    }
+
+    public List<SupplyDataModel> GetList(DateTime? startDate = null, DateTime? endDate = null, string? cocktailId = null)
+    {
+        try
+        {
+            var query = _dbContext.Supplies.Include(x => x.Cocktails).AsQueryable();
+            if (startDate.HasValue)
+                query = query.Where(x => x.SupplyDate >= DateTime.SpecifyKind(startDate ?? DateTime.UtcNow, DateTimeKind.Utc));
+            if (endDate.HasValue)
+                query = query.Where(x => x.SupplyDate <= DateTime.SpecifyKind(endDate ?? DateTime.UtcNow, DateTimeKind.Utc));
+            if (cocktailId is not null)
+            {
+                query = query.Where(x => x.Cocktails!.Any(y => y.CocktailId == cocktailId));
+            }
+            return [.. query.Select(x => _mapper.Map<SupplyDataModel>(x))];
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public SupplyDataModel GetElementById(string id)
+    {
+        try
+        {
+            return _mapper.Map<SupplyDataModel>(GetSuppliesById(id));
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public void AddElement(SupplyDataModel suppliesDataModel)
+    {
+        try
+        {
+            _dbContext.Supplies.Add(_mapper.Map<Supply>(suppliesDataModel));
+            _dbContext.SaveChanges();
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public void UpdateElement(SupplyDataModel suppliesDataModel)
+    {
+        try
+        {
+            var element = GetSuppliesById(suppliesDataModel.Id) ?? throw new ElementNotFoundException(suppliesDataModel.Id);
+            _dbContext.Supplies.Update(_mapper.Map(suppliesDataModel, element));
+            _dbContext.SaveChanges();
+        }
+        catch (ElementNotFoundException)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw;
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+    private Supply? GetSuppliesById(string id) => _dbContext.Supplies.FirstOrDefault(x => x.Id == id);
+}
+