Add FlatPaymentController with RESTful payment endpoints

Introduced FlatPaymentController under Distribution.Features.Payment, providing GET and POST endpoints at /api/payments. Supports listing, retrieving, and creating payments with filtering and error handling. Business logic is delegated to PaymentService.

Distribution/Features/Grn/GrnController.cs

@@ -6,6 +6,16 @@ namespace Distribution.Features.Grn;
 [ApiController]
 public class GrnController(GrnService service, ICurrentUserService currentUser) : ControllerBase
 {
+    [HttpGet("api/goods-receipts")]
+    public async Task<IActionResult> GetAll(
+        [FromQuery] Guid? purchaseOrderId,
+        [FromQuery] int page = 1,
+        [FromQuery] int pageSize = 20)
+    {
+        var result = await service.GetAllAsync(purchaseOrderId, page, pageSize);
+        return Ok(result);
+    }
+
     [HttpGet("api/goods-receipts/{id:guid}")]
     public async Task<IActionResult> GetById(Guid id)
     {
@@ -13,6 +23,19 @@ public class GrnController(GrnService service, ICurrentUserService currentUser)
         return result is null ? NotFound() : Ok(result);
     }
 
+    [HttpPost("api/goods-receipts")]
+    public async Task<IActionResult> CreateFlat(CreateFlatGrnRequest request, CancellationToken ct)
+    {
+        var userId = currentUser.UserId ?? throw new UnauthorizedAccessException();
+        try
+        {
+            var inner = new CreateGrnRequest(request.WarehouseId, request.Items);
+            var result = await service.CreateAsync(request.PurchaseOrderId, inner, userId, ct);
+            return CreatedAtAction(nameof(GetById), new { id = result.Id }, result);
+        }
+        catch (InvalidOperationException ex) { return Conflict(new { error = ex.Message }); }
+    }
+
     [HttpGet("api/purchase-orders/{id:guid}/goods-receipts")]
     public async Task<IActionResult> GetByPurchaseOrder(Guid id) =>
         Ok(await service.GetByPurchaseOrderIdAsync(id));

Distribution/Features/Grn/GrnDTOs.cs

@@ -4,6 +4,8 @@ public record GrnItemRequest(Guid PurchaseOrderItemId, int AcceptedQuantity, int
 
 public record CreateGrnRequest(Guid WarehouseId, List<GrnItemRequest> Items);
 
+public record CreateFlatGrnRequest(Guid PurchaseOrderId, Guid WarehouseId, List<GrnItemRequest> Items);
+
 public record GrnItemResponse(
     Guid Id,
     Guid PurchaseOrderItemId,

Distribution/Features/Grn/GrnRepository.cs

@@ -11,6 +11,21 @@ public class GrnRepository(AppDBContext context) : IGrnRepository
             .Include(gr => gr.Items).ThenInclude(i => i.PurchaseOrderItem).ThenInclude(poi => poi.Item)
             .FirstOrDefaultAsync(gr => gr.Id == id);
 
+    public async Task<List<Models.GoodsReceipt>> GetAllAsync(Guid? purchaseOrderId, int page, int pageSize) =>
+        await context.GoodsReceipts
+            .Include(gr => gr.Warehouse)
+            .Include(gr => gr.Items).ThenInclude(i => i.PurchaseOrderItem).ThenInclude(poi => poi.Item)
+            .Where(gr => gr.IsActive && (purchaseOrderId == null || gr.FK_PurchaseOrderId == purchaseOrderId))
+            .OrderByDescending(gr => gr.ReceivedAt)
+            .Skip((page - 1) * pageSize)
+            .Take(pageSize)
+            .ToListAsync();
+
+    public async Task<int> GetCountAsync(Guid? purchaseOrderId) =>
+        await context.GoodsReceipts
+            .Where(gr => gr.IsActive && (purchaseOrderId == null || gr.FK_PurchaseOrderId == purchaseOrderId))
+            .CountAsync();
+
     public async Task<List<Models.GoodsReceipt>> GetByPurchaseOrderIdAsync(Guid purchaseOrderId) =>
         await context.GoodsReceipts
             .Include(gr => gr.Warehouse)

Distribution/Features/Grn/GrnService.cs

@@ -19,6 +19,13 @@ public class GrnService(
         new(gr.Id, gr.FK_PurchaseOrderId, gr.FK_ReceivedByUserId, gr.FK_WarehouseId, gr.Warehouse?.Name ?? string.Empty,
             gr.ReceivedAt, gr.CreatedAt, gr.Items.Where(i => i.IsActive).Select(MapItem).ToList());
 
+    public async Task<PagedResponse<GrnResponse>> GetAllAsync(Guid? purchaseOrderId, int page, int pageSize)
+    {
+        var total = await repo.GetCountAsync(purchaseOrderId);
+        var items = await repo.GetAllAsync(purchaseOrderId, page, pageSize);
+        return new PagedResponse<GrnResponse>(page, pageSize, total, items.Select(Map).ToList());
+    }
+
     public async Task<GrnResponse?> GetByIdAsync(Guid id)
     {
         var gr = await repo.GetByIdAsync(id);

Distribution/Features/Grn/IGrnRepository.cs

@@ -3,6 +3,8 @@ namespace Distribution.Features.Grn;
 public interface IGrnRepository
 {
     Task<Models.GoodsReceipt?> GetByIdAsync(Guid id);
+    Task<List<Models.GoodsReceipt>> GetAllAsync(Guid? purchaseOrderId, int page, int pageSize);
+    Task<int> GetCountAsync(Guid? purchaseOrderId);
     Task<List<Models.GoodsReceipt>> GetByPurchaseOrderIdAsync(Guid purchaseOrderId);
     Task AddAsync(Models.GoodsReceipt entity);