A couple of new logics have been implemented. Need to create views for complicated queries. :|

RentalBusiness/AuxilaryElements/BusinessLogic/BrandLogic.cs

@@ -0,0 +1,88 @@
+using Npgsql;
+using RentalBusiness.Models.ViewModels;
+
+namespace RentalBusiness.AuxilaryElements.BusinessLogic
+{
+    public class BrandLogic
+    {
+        public List<BrandViewModel> _brand;
+
+        public BrandLogic()
+        {
+            _brand = new();
+            _brand = ReadBrands().Result;
+        }
+
+        public async Task<List<BrandViewModel>> ReadBrands()
+        {
+            NpgsqlConnection connection = new NpgsqlConnection("Host=localhost;Database=local;Username=postgres;Password=postgres");
+            List<BrandViewModel> brands = new List<BrandViewModel>();
+            connection.Open();
+
+            await using (NpgsqlCommand getRecordStorage = new NpgsqlCommand("SELECT brand_id, brand_name, brand_ratio FROM brand", connection))
+            {
+                await using (NpgsqlDataReader reader = await getRecordStorage.ExecuteReaderAsync())
+                {
+                    while (await reader.ReadAsync())
+                    {
+                        BrandViewModel viewModel = ReadModelView(reader);
+                        brands.Add(viewModel);
+                    }
+                }
+            }
+            connection.Close();
+            return brands;
+
+        }
+
+        public BrandViewModel ReadModelView(NpgsqlDataReader reader)
+        {
+            int? id = reader["brand_id"] as int?;
+            string brandName = reader["brand_name"] as string;
+            int? ratio = reader["brand_ratio"] as int?;
+            BrandViewModel view = new BrandViewModel
+            {
+                ID = id.Value,
+                BrandName = new string(brandName)
+            };
+            return view;
+        }
+
+        public void PostBrand(BrandViewModel view)
+        {
+            NpgsqlConnection connection = new NpgsqlConnection("Host=localhost;Database=local;Username=postgres;Password=postgres");
+            connection.Open();
+
+            using var checkDuplicate = new NpgsqlCommand("SELECT brand_id FROM brand WHERE brand_name LIKE @bn")
+            {
+                Parameters =
+                {
+                    new("bn", view.BrandName)
+                }
+
+                
+            };
+
+            int? buff = Convert.ToInt32(checkDuplicate.ExecuteScalar());
+
+            if(buff == null)
+            {
+                return;
+            }
+
+            using var postBrand = new NpgsqlCommand("INSERT INTO brand (brand_name,brand_ratio) VALUES(@bs,@br)",connection)
+            {
+                Parameters =
+                {
+                    new("bs",view.BrandName),
+                    new("br",view.BrandRatio)
+                }
+            };
+
+            postBrand.ExecuteNonQueryAsync();
+
+            connection.Close();
+
+        }
+    }
+}

RentalBusiness/AuxilaryElements/BusinessLogic/ModelLogic.cs

@@ -0,0 +1,74 @@
+using Npgsql;
+using RentalBusiness.Enums;
+using RentalBusiness.Models.ViewModels;
+using static Microsoft.EntityFrameworkCore.DbLoggerCategory.Database;
+
+namespace RentalBusiness.AuxilaryElements.BusinessLogic
+{
+    public class ModelLogic
+    {
+        public List<ModelViewModel> _model;
+
+        public ModelLogic()
+        {
+            _model = new();
+            _model = ReadModels().Result;
+        }
+
+        public async Task<List<ModelViewModel>> ReadModels()
+        {
+            NpgsqlConnection connection = new NpgsqlConnection("Host=localhost;Database=local;Username=postgres;Password=postgres");
+            List<ModelViewModel> models = new List<ModelViewModel>();
+            connection.Open();
+           
+            await using (NpgsqlCommand getRecordStorage = new NpgsqlCommand("SELECT model_id, model_spec, model_ratio FROM model", connection))
+            {
+                await using (NpgsqlDataReader reader = await getRecordStorage.ExecuteReaderAsync())
+                {
+                    while (await reader.ReadAsync())
+                    {
+                        ModelViewModel viewModel = ReadModelView(reader);
+                        models.Add(viewModel);
+                    }
+                }
+            }
+            connection.Close();
+            return models;
+            
+        }
+
+        public ModelViewModel ReadModelView(NpgsqlDataReader reader)
+        {
+            int? id = reader["model_id"] as int?;
+            string modelSpec = reader["model_spec"] as string;
+            int? ratio = reader["model_ratio"] as int?;
+            ModelViewModel view = new ModelViewModel
+            {
+                ID = id.Value,
+                ModelSpec = new string(modelSpec),
+                ModelRatio = ratio.Value,
+            };
+            return view;
+        }
+
+        public void PostModel(ModelViewModel view)
+        {
+            NpgsqlConnection connection = new NpgsqlConnection("Host=localhost;Database=local;Username=postgres;Password=postgres");
+            connection.Open();
+
+            using var postModel = new NpgsqlCommand("INSERT INTO model (model_spec,model_ratio) VALUES(@ms,@mr)")
+            {
+                Parameters =
+                {
+                    new("ms",view.ModelSpec),
+                    new("mr",view.ModelRatio)
+                }
+            };
+
+            postModel.ExecuteNonQueryAsync();
+
+            connection.Close();
+
+        }
+    }
+}

RentalBusiness/AuxilaryElements/BusinessLogic/StorageLogic.cs

@@ -1,4 +1,5 @@
-using Npgsql;
+using Microsoft.EntityFrameworkCore.Metadata.Internal;
+using Npgsql;
 using RentalBusiness.Enums;
 using RentalBusiness.Models.ViewModels;
 
@@ -8,7 +9,6 @@ namespace RentalBusiness.AuxilaryElements.BusinessLogic
     {
         public List<StorageViewModel> _storageFull;
         public List<StorageViewModel> _storageFree;
-
         public StorageLogic()
         {
             _storageFree = new List<StorageViewModel>();
@@ -77,5 +77,26 @@ namespace RentalBusiness.AuxilaryElements.BusinessLogic
             };
             return view;
         }
+
+        public void PostCar(StorageViewModel model)
+        {
+            NpgsqlConnection connection = new NpgsqlConnection("Host=localhost;Database=local;Username=postgres;Password=postgres");
+            connection.Open();
+
+            using var postCar = new NpgsqlCommand("INSERT INTO storage(brand_id,model_id,car_ratio_per_hour,car_status) VALUES(@bid,@mid,@ratio,@cs)", connection)
+            { 
+                Parameters = 
+                {
+                    new("bid",model.Brand_ID),
+                    new("mid",model.Model_ID),
+                    new("ratio",model.CarRatio),
+                    new("cs",model.CarStatus),
+                }
+            };
+
+            postCar.ExecuteNonQueryAsync();
+
+            connection.Close();
+        }
     }
 }

RentalBusiness/Controllers/HomeController.cs

@@ -12,12 +12,16 @@ namespace RentalBusiness.Controllers
         private readonly StorageLogic _storageLogic;
         private readonly ClientLogic _clientLogic;
         private readonly ContractLogic _contractLogic;
+        private readonly ModelLogic _modelLogic;
+        private readonly BrandLogic _brandLogic;
         public HomeController(ILogger<HomeController> logger)
         {
             _logger = logger;
             _storageLogic = new StorageLogic();
             _clientLogic = new ClientLogic();
             _contractLogic = new ContractLogic();
+            _modelLogic = new ModelLogic();
+            _brandLogic = new BrandLogic();
         }
 
         [HttpGet]
@@ -77,10 +81,51 @@ namespace RentalBusiness.Controllers
         [HttpGet]
         public IActionResult Car()
         {
-            ViewBag.Cars = _storageLogic._storageFull;
+            ViewBag.Models = _modelLogic._model;
+            ViewBag.Brands = _brandLogic._brand;
             return View();
         }
 
+        [HttpPost]
+        public void Car(string? brandname, int? brandratio, string? modelname, int? modelratio, int? brand, int? model )
+        {
+            if(!string.IsNullOrEmpty(brandname) && !string.IsNullOrEmpty(brandratio.ToString()))
+            {
+                BrandViewModel brandModel = new()
+                {
+                    BrandName = brandname,
+                    BrandRatio = brandratio
+                };
+
+                _brandLogic.PostBrand(brandModel);
+            }
+
+            if (!string.IsNullOrEmpty(modelname) && !string.IsNullOrEmpty(modelratio.ToString()))
+            {
+                ModelViewModel modelModel = new()
+                {
+                    ModelSpec = modelname,
+                    ModelRatio = brandratio
+                };
+
+                _modelLogic.PostModel(modelModel);
+                return;
+            }
+
+            if(brand != null && model != null)
+            {
+                StorageViewModel storageModel = new()
+                {
+                    Brand_ID = brand,
+                    Model_ID = model,
+                    CarRatio = _modelLogic._model.First(x => x.ID == model).ModelRatio + _brandLogic._brand.First(x => x.ID == brand).BrandRatio  
+                };
+
+                _storageLogic.PostCar(storageModel);
+            }
+
+        }
+
         [HttpGet]
         public IActionResult Storage()
         {

RentalBusiness/Models/ViewModels/BrandViewModel.cs

@@ -0,0 +1,9 @@
+namespace RentalBusiness.Models.ViewModels
+{
+    public class BrandViewModel
+    {
+        public int? ID { get; set; }
+        public string BrandName { get; set; } = string.Empty;
+        public int? BrandRatio { get; set; }
+    }
+}

RentalBusiness/Models/ViewModels/ModelViewModel.cs

@@ -0,0 +1,10 @@
+namespace RentalBusiness.Models.ViewModels
+{
+    public class ModelViewModel
+    {
+        public int? ID { get; set; }
+        public string ModelSpec { get; set; } = string.Empty;
+
+        public int? ModelRatio { get; set; }
+    }
+}

RentalBusiness/Models/ViewModels/StorageViewModel.cs

@@ -7,8 +7,11 @@ namespace RentalBusiness.Models.ViewModels
         public int ID { get; set; }
         public string CarInfo { get; set; } = string.Empty;
 
-        public int CarRatio { get; set; }
+        public int? CarRatio { get; set; }
 
         public CarStatus CarStatus { get; set; } = CarStatus.available;
+
+        public int? Brand_ID { get; set; }
+        public int? Model_ID { get; set; }
     }
 }

RentalBusiness/Views/Home/Car.cshtml

@@ -20,15 +20,15 @@
             <div class="modeltitle" style="text-align: center; font-size: 25px;">ADD A MODEL</div>
             <div class="modelname" style="text-align: left; font-size: 15px;">Model name:</div>
             <input type="text" id="modelname" name="modelname" />
-            <div class="modeltratio" style="text-align: left; font-size: 15px;">Model ratio:</div>
+            <div class="modelratio" style="text-align: left; font-size: 15px;">Model ratio:</div>
-            <input type="text" id="modeltratio" name="modeltratio" />
+            <input type="text" id="modelratio" name="modelratio" />
             <input type="submit" id="modelbtn" value="Model" class="btn btn-primary" />
         </div>
         <aside style="flex: 1"></aside>
         <div class="flex-containerB3" style="flex-direction: column; background-color:yellow;flex: 4; gap: 20px;display: flex; align-items: center; justify-content: center;">
             <div class="brandtitle" style="text-align: center; font-size: 25px;">ADD A CAR</div>
-            <select></select>
+            <select id="brand" name="brand" class="form-control" asp-items="@(new SelectList(@ViewBag.Brands,"ID","BrandName"))"></select>
-            <select></select>
+            <select id="model" name="model" class="form-control" asp-items="@(new SelectList(@ViewBag.Models,"ID","ModelSpec"))"></select>
             <input type="submit" id="carbtn" value="Car" class="btn btn-primary" />
         </div>
         <aside style="flex: 1"></aside>

RentalBusiness/Views/Shared/_Layout.cshtml

@@ -29,7 +29,7 @@
                             <a class="nav-link text-dark" asparea="" asp-controller="Home" asp-action="Index">ADD CONTRACT</a>
                         </li>
                         <li class="nav-item">
-                            <a class="nav-link text-dark" asparea="" asp-controller="Home" asp-action="Car">ADD CAR</a>
+                            <a class="nav-link text-dark" asparea="" asp-controller="Home" asp-action="Car">ADD BRAND/MODEL/CAR</a>
                         </li>
                         <li class="nav-item">
                             <a class="nav-link text-dark" asparea="" asp-controller="Home" asp-action="Customer">ADD CUSTOMER</a>