using CMSMicroservice.Protobuf.Protos.Commission;

namespace FrontOffice.BFF.Application.CommissionCQ.Queries.GetMyCommissionPayouts;

public class GetMyCommissionPayoutsQueryHandler : IRequestHandler<GetMyCommissionPayoutsQuery, GetMyCommissionPayoutsResponseDto>
{
    private readonly IApplicationContractContext _context;
    private readonly ICurrentUserService _currentUserService;

    public GetMyCommissionPayoutsQueryHandler(
        IApplicationContractContext context,
        ICurrentUserService currentUserService)
    {
        _context = context;
        _currentUserService = currentUserService;
    }

    public async Task<GetMyCommissionPayoutsResponseDto> Handle(GetMyCommissionPayoutsQuery request, CancellationToken cancellationToken)
    {
        var userId = _currentUserService.UserId ?? throw new UnauthorizedAccessException("User not authenticated");

        // Fixed: Use PageIndex (0-based) not PageNumber (1-based), and WeekNumber is string
        var cmsRequest = new GetUserCommissionPayoutsRequest
        {
            UserId = userId, // long? type in proto - just assign directly
            PageIndex = Math.Max(0, request.PageNumber - 1), // Convert 1-based to 0-based
            PageSize = request.PageSize
        };

        // WeekNumber is string type in proto - assign directly
        if (request.WeekDefinitionId!=null)
            cmsRequest.WeekDefinitionId = request.WeekDefinitionId;

        if (request.Status.HasValue)
            cmsRequest.Status = request.Status.Value; // int? type in proto

        var response = await _context.Commission.GetUserCommissionPayoutsAsync(cmsRequest, cancellationToken: cancellationToken);

        var payouts = response.Models.Select(p => new CommissionPayoutDto
        {
            Id = p.Id,
            WeekDefinitionId = p.WeekDefinitionId,
            WeekDisplayName = p.WeekDisplayName,
            BalancesEarned = (int)p.BalancesEarned,
            TotalAmount = p.TotalAmount,
            AmountFormatted = FormatCurrency(p.TotalAmount),
            Status = MapStatus(p.Status),
            StatusBadgeColor = GetStatusColor(p.Status),
            CalculatedDate = p.Created?.ToDateTime() ?? DateTime.UtcNow,
            DatePersian = FormatPersianDate(p.Created?.ToDateTime())
        }).ToList();

        return new GetMyCommissionPayoutsResponseDto
        {
            Payouts = payouts,
            TotalCount = (int)response.MetaData.TotalCount,
            PageNumber = request.PageNumber,
            PageSize = request.PageSize
        };
    }

    private static string MapStatus(int status)
    {
        return status switch
        {
            0 => "Pending",
            1 => "Calculated",
            2 => "Paid",
            3 => "Withdrawn",
            _ => "Unknown"
        };
    }

    private static string GetStatusColor(int status)
    {
        return status switch
        {
            0 => "warning",
            1 => "info",
            2 => "success",
            3 => "success",
            _ => "default"
        };
    }

    private static string FormatCurrency(long amount)
    {
        return $"{amount:N0} تومان";
    }

    private static string FormatPersianDate(DateTime? date)
    {
        if (!date.HasValue) return string.Empty;
        // TODO: استفاده از PersianCalendar
        return date.Value.ToString("yyyy/MM/dd");
    }
}