namespace Distribution.Features.Grn;

/// <summary>BatchNumber is null for an expiry-only lot (TracksExpiryDate without TracksBatches).</summary>
public record GrnBatchLineRequest(string? BatchNumber, DateTime? ExpiryDate, int Quantity);

public record GrnItemRequest(
    // Set for a PO-based receipt; null for a direct receipt (ItemId is used instead).
    Guid? PurchaseOrderItemId,
    int AcceptedQuantity,
    int RejectedQuantity,
    // Populated only when the item has TracksBatches and/or TracksExpiryDate set.
    List<GrnBatchLineRequest>? Batches = null,
    // Populated only when the item has TracksSerialNumbers set — must contain exactly AcceptedQuantity entries.
    List<string>? SerialNumbers = null,
    // Set for a direct receipt line (no purchase order).
    Guid? ItemId = null,
    // Cost per base-UOM unit. Null on a PO line falls back to the PO line's unit cost; null on a direct line is 0.
    decimal? UnitCost = null,
    // Null falls back to the GRN-wide percentage.
    decimal? DiscountPercent = null,
    decimal? VatPercent = null,
    // Free-issue units: stocked but not costed. Serial/batch entries must cover accepted + free.
    int FreeQuantity = 0);

public record CreateGrnRequest(
    Guid WarehouseId,
    List<GrnItemRequest> Items,
    // TEMPORARY: required while auth doesn't resolve a logged-in user server-side — see testbug.md #28.
    Guid? ReceivedByUserId = null,
    // GRN-wide defaults for lines that don't set their own.
    decimal? DiscountPercent = null,
    decimal? VatPercent = null);

public record CreateFlatGrnRequest(
    Guid PurchaseOrderId,
    Guid WarehouseId,
    List<GrnItemRequest> Items,
    // TEMPORARY: required while auth doesn't resolve a logged-in user server-side — see testbug.md #28.
    Guid? ReceivedByUserId = null,
    decimal? DiscountPercent = null,
    decimal? VatPercent = null);

/// <summary>A goods receipt with no purchase order. SupplierId is optional.</summary>
public record CreateDirectGrnRequest(
    Guid WarehouseId,
    List<GrnItemRequest> Items,
    Guid? SupplierId = null,
    // TEMPORARY: required while auth doesn't resolve a logged-in user server-side — see testbug.md #28.
    Guid? ReceivedByUserId = null,
    decimal? DiscountPercent = null,
    decimal? VatPercent = null);

public record GrnBatchLineResponse(string? BatchNumber, DateTime? ExpiryDate, int Quantity);

public record GrnItemResponse(
    Guid Id,
    Guid? PurchaseOrderItemId,
    Guid ItemId,
    string Sku,
    string ItemName,
    int AcceptedQuantity,
    int RejectedQuantity,
    List<GrnBatchLineResponse> Batches,
    List<string> SerialNumbers,
    decimal UnitCost,
    decimal DiscountPercent,
    decimal VatPercent,
    // Accepted qty x unit cost, before discount.
    decimal GrossAmount,
    decimal DiscountAmount,
    decimal VatAmount,
    // Gross - discount + VAT.
    decimal LineTotal,
    int FreeQuantity);

public record GrnResponse(
    Guid Id,
    Guid? PurchaseOrderId,
    Guid ReceivedByUserId,
    Guid WarehouseId,
    string WarehouseName,
    Guid? SupplierId,
    string? SupplierName,
    DateTime ReceivedAt,
    DateTime CreatedAt,
    List<GrnItemResponse> Items,
    decimal DiscountPercent,
    decimal VatPercent,
    // Sum of line gross amounts.
    decimal SubTotal,
    decimal DiscountAmount,
    // SubTotal - DiscountAmount (the base VAT is charged on).
    decimal TaxableAmount,
    decimal VatAmount,
    decimal TotalAmount);