initial commit

Features/Sales/Invoice/Cqrs/CreateInvoiceHandler.cs

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+using Indotalent.ConfigBackEnd.Extensions;
+using Indotalent.Infrastructure.Database;
+using MediatR;
+
+namespace Indotalent.Features.Sales.Invoice.Cqrs;
+
+public class CreateInvoiceRequest
+{
+    public DateTime? InvoiceDate { get; set; }
+    public Data.Enums.InvoiceStatus InvoiceStatus { get; set; }
+    public string? Description { get; set; }
+    public string? SalesOrderId { get; set; }
+}
+
+public class CreateInvoiceResponse
+{
+    public string? Id { get; set; }
+    public string? AutoNumber { get; set; }
+}
+
+public record CreateInvoiceCommand(CreateInvoiceRequest Data) : IRequest<CreateInvoiceResponse>;
+
+public class CreateInvoiceHandler : IRequestHandler<CreateInvoiceCommand, CreateInvoiceResponse>
+{
+    private readonly AppDbContext _context;
+    public CreateInvoiceHandler(AppDbContext context) => _context = context;
+
+    public async Task<CreateInvoiceResponse> Handle(CreateInvoiceCommand request, CancellationToken cancellationToken)
+    {
+        var entityName = nameof(Data.Entities.Invoice);
+        var autoNo = await _context.GenerateAutoNumberAsync(
+            entityName: entityName,
+            prefixTemplate: $"INV/{{Year}}/{{Month}}/",
+            ct: cancellationToken
+        );
+
+        var entity = new Data.Entities.Invoice
+        {
+            AutoNumber = autoNo,
+            InvoiceDate = request.Data.InvoiceDate,
+            InvoiceStatus = request.Data.InvoiceStatus,
+            Description = request.Data.Description,
+            SalesOrderId = request.Data.SalesOrderId
+        };
+
+        _context.Invoice.Add(entity);
+        await _context.SaveChangesAsync(cancellationToken);
+
+        return new CreateInvoiceResponse
+        {
+            Id = entity.Id,
+            AutoNumber = entity.AutoNumber
+        };
+    }
+}