initial commit

Features/Purchase/PurchaseOrder/Cqrs/CreatePurchaseOrderHandler.cs

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+using Indotalent.ConfigBackEnd.Extensions;
+using Indotalent.Infrastructure.Database;
+using MediatR;
+
+namespace Indotalent.Features.Purchase.PurchaseOrder.Cqrs;
+
+public class CreatePurchaseOrderRequest
+{
+    public DateTime? OrderDate { get; set; }
+    public Data.Enums.PurchaseOrderStatus OrderStatus { get; set; }
+    public string? Description { get; set; }
+    public string? VendorId { get; set; }
+    public string? TaxId { get; set; }
+}
+
+public class CreatePurchaseOrderResponse
+{
+    public string? Id { get; set; }
+    public string? AutoNumber { get; set; }
+}
+
+public record CreatePurchaseOrderCommand(CreatePurchaseOrderRequest Data) : IRequest<CreatePurchaseOrderResponse>;
+
+public class CreatePurchaseOrderHandler : IRequestHandler<CreatePurchaseOrderCommand, CreatePurchaseOrderResponse>
+{
+    private readonly AppDbContext _context;
+    public CreatePurchaseOrderHandler(AppDbContext context) => _context = context;
+
+    public async Task<CreatePurchaseOrderResponse> Handle(CreatePurchaseOrderCommand request, CancellationToken cancellationToken)
+    {
+        var entityName = nameof(Data.Entities.PurchaseOrder);
+        var autoNo = await _context.GenerateAutoNumberAsync(
+            entityName: entityName,
+            prefixTemplate: $"PO/{{Year}}/{{Month}}/",
+            ct: cancellationToken
+        );
+
+        var entity = new Data.Entities.PurchaseOrder
+        {
+            AutoNumber = autoNo,
+            OrderDate = request.Data.OrderDate,
+            OrderStatus = request.Data.OrderStatus,
+            Description = request.Data.Description,
+            VendorId = request.Data.VendorId,
+            TaxId = request.Data.TaxId,
+            BeforeTaxAmount = 0,
+            TaxAmount = 0,
+            AfterTaxAmount = 0
+        };
+
+        _context.PurchaseOrder.Add(entity);
+        await _context.SaveChangesAsync(cancellationToken);
+
+        return new CreatePurchaseOrderResponse
+        {
+            Id = entity.Id,
+            AutoNumber = entity.AutoNumber
+        };
+    }
+}