LabWork6 : everything till storage implementation is done.

DressAtelierBusinessLogic/BusinessLogic/EmployeeLogic.cs

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+using DressAtelierContracts.BindingModels;
+using DressAtelierContracts.BusinessLogicContracts;
+using DressAtelierContracts.SearchModels;
+using DressAtelierContracts.StorageContracts;
+using DressAtelierContracts.ViewModels;
+using Microsoft.Extensions.Logging;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DressAtelierBusinessLogic.BusinessLogic
+{
+    public class EmployeeLogic : IEmployeeLogic
+    {
+        private readonly ILogger _logger;
+        private readonly IEmployeeStorage _employeeStorage;
+        public EmployeeLogic(ILogger<EmployeeLogic> logger, IEmployeeStorage employeeStorage)
+        {
+            _logger = logger;
+            _employeeStorage = employeeStorage;
+        }
+        public bool Create(EmployeeBindingModel model)
+        {
+            CheckEmployee(model);
+            if(_employeeStorage.Insert(model) == null)
+            {
+                _logger.LogWarning("Insert operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public bool Update(EmployeeBindingModel model)
+        {
+            CheckEmployee(model);
+            if (_employeeStorage.Update(model) == null)
+            {
+                _logger.LogWarning("Update operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public bool Delete(EmployeeBindingModel model)
+        {
+            CheckEmployee(model,false);
+            _logger.LogInformation("Delete. ID:{ID}", model.ID);
+            if (_employeeStorage.Delete(model) == null)
+            {
+                _logger.LogWarning("Delete operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public EmployeeViewModel? ReadElement(EmployeeSearchModel model)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            _logger.LogInformation("ReadElement. FullName:{FullName}.ID:{ ID}", model.FullName, model.ID);
+            var element = _employeeStorage.GetElement(model);
+            if (element == null)
+            {
+                _logger.LogWarning("ReadElement element not found");
+                return null;
+            }
+            _logger.LogInformation("ReadElement find. ID:{ID}", element.ID);
+            return element;
+        }
+
+        public List<EmployeeViewModel>? ReadList(EmployeeSearchModel? model)
+        {
+            _logger.LogInformation("ReadList. FullName:{FullName}. ID:{ ID}", model?.FullName, model?.ID);
+
+            var list = model == null ? _employeeStorage.GetFullList() : _employeeStorage.GetFilteredList(model);
+
+            if (list == null)
+            {
+                _logger.LogWarning("ReadList return null list");
+                return null;
+            }
+            _logger.LogInformation("ReadList. Count:{Count}", list.Count);
+            return list;
+        }
+
+        public void CheckEmployee(EmployeeBindingModel model, bool withParams = true)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            if (!withParams)
+            {
+                return;
+            }
+            if (string.IsNullOrEmpty(model.FullName))
+            {
+                throw new ArgumentNullException("Invalid fullname of employee", nameof(model.FullName));
+            }
+            if (string.IsNullOrEmpty(model.Occupation))
+            {
+                throw new ArgumentNullException("Invalid occupation of employee", nameof(model.Occupation));
+            }
+            if (string.IsNullOrEmpty(model.WorkExperience.ToString()))
+            {
+                throw new ArgumentNullException("Invalid email of employee", nameof(model.WorkExperience));
+            }
+            if (string.IsNullOrEmpty(model.Password))
+            {
+                throw new ArgumentNullException("Invalid password of employee", nameof(model.Password));
+            }
+            _logger.LogInformation("Employee. FullName:{ FullName}. WorkExperience:{ WorkExperience}. Occupation:{ Occupation}. ID: { ID} ", model.FullName, model.WorkExperience,model.Occupation, model.ID);
+
+            var element = _employeeStorage.GetElement(new EmployeeSearchModel
+            {
+                FullName = model.FullName
+            });
+
+            if (element != null && element.ID != model.ID)
+            {
+                throw new InvalidOperationException("Employee with such fullname already exists.");
+            }
+        }
+    }
+}

DressAtelierContracts/BindingModels/EmployeeBindingModel.cs

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+using DressAtelierDataModels.Models;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DressAtelierContracts.BindingModels
+{
+    public class EmployeeBindingModel : IEmployeeModel
+    {
+        public int ID { get; set; }
+        public string FullName { get; set; } = string.Empty;
+        public string Password { get; set; } = string.Empty;
+        public int WorkExperience { get; set; }
+        public string Occupation { get; set; } = string.Empty;
+    }
+}

DressAtelierContracts/BusinessLogicContracts/IEmployeeLogic.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DressAtelierContracts.BusinessLogicContracts
+{
+    internal interface IEmployeeLogic
+    {
+    }
+}

DressAtelierContracts/SearchModels/EmployeeSearchModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DressAtelierContracts.SearchModels
+{
+    public class EmployeeSearchModel
+    {
+        public int? ID { get; set; }
+        public string? FullName { get; set; }
+        public string? Password { get; set; }
+    }
+}

DressAtelierContracts/StorageContracts/IEmployeeStorage.cs

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+using DressAtelierContracts.BindingModels;
+using DressAtelierContracts.SearchModels;
+using DressAtelierContracts.ViewModels;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DressAtelierContracts.StorageContracts
+{
+    public interface IEmployeeStorage
+    {
+        List<EmployeeViewModel> GetFullList();
+        List<EmployeeViewModel> GetFilteredList(EmployeeSearchModel model);
+        EmployeeViewModel? GetElement(EmployeeSearchModel model);
+        EmployeeViewModel? Insert(EmployeeBindingModel model);
+        EmployeeViewModel? Update(EmployeeBindingModel model);
+        EmployeeViewModel? Delete(EmployeeBindingModel model);
+    }
+}

DressAtelierContracts/ViewModels/EmployeeViewModel.cs

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+using DressAtelierDataModels.Models;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DressAtelierContracts.ViewModels
+{
+    public class EmployeeViewModel : IEmployeeModel
+    {
+        public int ID { get; set; }
+        [DisplayName("Employee's fullname")]
+        public string FullName { get; set; } = string.Empty;
+        [DisplayName("Password")]
+        public string Password { get; set; } = string.Empty;
+        [DisplayName("WorkExperience")]
+        public int WorkExperience { get; set; }
+        [DisplayName("Occupation")]
+        public string Occupation { get; set; } = string.Empty;
+    }
+}

DressAtelierDataModels/Models/IEmployeeModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DressAtelierDataModels.Models
+{
+    public interface IEmployeeModel
+    {
+        string FullName { get; set; }
+        string Password { get; set; }
+        int WorkExperience { get; set; }
+        string Occupation { get; set; }
+    }
+}