using Distribution.Models;

namespace Distribution.Features.Po;

public record PoItemRequest(Guid ItemId, int Quantity, decimal UnitCost);

public record CreatePoRequest(Guid SupplierId, List<PoItemRequest> Items);

/// <summary>
/// Update line: PurchaseOrderItemId set = update an existing unreceived line (Quantity/UnitCost),
/// null = add a new line to the Po. Only valid while the Po is Issued.
/// </summary>
public record UpdatePoLineRequest(Guid? PurchaseOrderItemId, Guid ItemId, int Quantity, decimal UnitCost);

public record UpdatePoRequest(List<UpdatePoLineRequest> Items);

public record CancelPoRequest(string Reason);

public record CancelPoLineRequest(string? Reason);

public record PoItemResponse(
    Guid Id,
    Guid ItemId,
    string Sku,
    string ItemName,
    int Quantity,
    decimal UnitCost,
    int ReceivedQuantity,
    int CancelledQuantity,
    bool IsCancelled);

public record PoResponse(
    Guid Id,
    Guid SupplierId,
    string SupplierName,
    Guid CreatedByUserId,
    PurchaseOrderStatus Status,
    string? CancelReason,
    bool IsActive,
    DateTime CreatedAt,
    List<PoItemResponse> Items);

/// <summary>
/// Minimal Po-vs-Grn quantity/cost reconciliation. Full 3-way match (Po + Grn + Invoice) activates
/// once Finance's Invoice entity (step 19, not yet built) exists — until then this compares only
/// PurchaseOrderItem vs GoodsReceiptItem.
/// </summary>
public record InvoiceMatchLineResult(Guid PurchaseOrderItemId, Guid ItemId, int OrderedQuantity, int AcceptedQuantity, decimal UnitCost, bool QuantityMatches);

public record InvoiceMatchResult(Guid PurchaseOrderId, Guid? GoodsReceiptId, Guid? InvoiceId, bool IsMatched, List<InvoiceMatchLineResult> Lines, string Note);

public record ResolveInvoiceVarianceRequest(string Variance, string Resolution, decimal? AdjustedUnitCost, Guid? PurchaseOrderItemId);

public record InvoiceVarianceResolutionResponse(Guid PurchaseOrderId, string Variance, string Resolution, DateTime ResolvedAt);