using CMSMicroservice.Protobuf.Protos.Inventory;
using Google.Protobuf.WellKnownTypes;

namespace BackOffice.BFF.Application.InventoryCQ.Queries.GetStockMovements;

public class GetStockMovementsQueryHandler : IRequestHandler<GetStockMovementsQuery, GetStockMovementsResponseDto>
{
    private readonly IApplicationContractContext _context;

    public GetStockMovementsQueryHandler(IApplicationContractContext context)
    {
        _context = context;
    }

    public async Task<GetStockMovementsResponseDto> Handle(GetStockMovementsQuery request, CancellationToken cancellationToken)
    {
        var protoRequest = new GetStockMovementsRequest
        {
            Page = request.PageIndex,
            PageSize = request.PageSize
        };

        if (request.InventoryItemId.HasValue)
            protoRequest.InventoryItemId = request.InventoryItemId.Value;
        
        if (request.ProductId.HasValue)
            protoRequest.ProductId = request.ProductId.Value;
        
        if (request.ProductType.HasValue)
            protoRequest.ProductType = (ProductType)request.ProductType.Value;
        
        if (request.MovementType.HasValue)
            protoRequest.MovementType = (StockMovementType)request.MovementType.Value;
        
        if (request.FromDate.HasValue)
            protoRequest.FromDate = Timestamp.FromDateTime(request.FromDate.Value.ToUniversalTime());
        
        if (request.ToDate.HasValue)
            protoRequest.ToDate = Timestamp.FromDateTime(request.ToDate.Value.ToUniversalTime());

        var response = await _context.Inventory.GetStockMovementsAsync(protoRequest, cancellationToken: cancellationToken);

        return new GetStockMovementsResponseDto
        {
            TotalCount = response.TotalCount,
            MetaData = new MetaData
            {
                TotalCount = response.TotalCount,
                PageSize = request.PageSize,
                CurrentPage = request.PageIndex,
                TotalPage = (int)Math.Ceiling((double)response.TotalCount / request.PageSize)
            },
            Movements = response.Movements.Select(m => new StockMovementDto
            {
                Id = m.Id,
                InventoryItemId = m.InventoryItemId,
                ProductName = m.ProductTitle,
                MovementType = (int)m.MovementType,
                MovementTypeName = GetMovementTypeName(m.MovementType),
                Quantity = m.Quantity,
                QuantityBefore = m.QuantityBefore,
                QuantityAfter = m.QuantityAfter,
                OrderId = m.OrderId,
                DiscountOrderId = m.DiscountOrderId,
                ReferenceNumber = string.IsNullOrEmpty(m.ReferenceNumber) ? null : m.ReferenceNumber,
                Note = string.IsNullOrEmpty(m.Note) ? null : m.Note,
                PerformedByUserId = m.PerformedByUserId,
                PerformedByUserName = null,
                CreatedAt = m.Created?.ToDateTime() ?? DateTime.MinValue
            }).ToList()
        };
    }

    private static string GetMovementTypeName(StockMovementType type) => type switch
    {
        StockMovementType.InitialStock => "موجودی اولیه",
        StockMovementType.Restock => "ورود کالا",
        StockMovementType.Return => "برگشت از مشتری",
        StockMovementType.Sale => "فروش",
        StockMovementType.AdjustmentIncrease => "تعدیل افزایشی",
        StockMovementType.AdjustmentDecrease => "تعدیل کاهشی",
        StockMovementType.Reserved => "رزرو",
        StockMovementType.Released => "آزادسازی رزرو",
        StockMovementType.Loss => "مفقودی",
        StockMovementType.Damaged => "ضایعات",
        StockMovementType.Expired => "منقضی",
        StockMovementType.TransferOut => "انتقال به انبار",
        StockMovementType.TransferIn => "انتقال از انبار",
        _ => "نامشخص"
    };
}