using Application.Abstractions.Data;
using Application.Abstractions.Messaging;
using Domain.Entities.Store.ValueObject;
using Microsoft.EntityFrameworkCore;
using SharedKernel.Results;

namespace Application.Features.Admin.Store.Settlement.MarkSettled;

public sealed class Handler(IAppDbContext db) : ICommandHandler<Command, Result>
{
    public async Task<Result> Handle(Command request, CancellationToken ct)
    {
        if (string.IsNullOrWhiteSpace(request.AdminUserId))
        {
            return Result.Failure(Error.Problem("GameSettlement.AdminRequired", "처리 관리자 정보가 누락되었습니다."));
        }

        if (request.AdminMemo is { Length: > 500 })
        {
            return Result.Failure(Error.Problem("GameSettlement.AdminMemoTooLong", "관리자 메모는 500자 이하여야 합니다."));
        }

        var settlement = await db.GameSettlement
            .FirstOrDefaultAsync(s => s.ID == request.ID, ct);

        if (settlement is null)
        {
            return Result.Failure(Error.NotFound("GameSettlement.NotFound", "정산 정보를 찾을 수 없습니다."));
        }

        if (settlement.Status != GameSettlementStatus.Pending)
        {
            return Result.Failure(Error.Problem("GameSettlement.AlreadySettled", "이미 정산 완료된 항목입니다."));
        }

        try
        {
            settlement.MarkSettled(request.AdminUserId, request.AdminEmail, request.AdminMemo);
        }
        catch (InvalidOperationException ex)
        {
            return Result.Failure(Error.Problem("GameSettlement.InvalidTransition", ex.Message));
        }
        catch (ArgumentOutOfRangeException ex)
        {
            return Result.Failure(Error.Problem("GameSettlement.InvalidArgument", ex.Message));
        }

        await db.SaveChangesAsync(ct);

        return Result.Success();
    }
}