using Application.Abstractions.Data;
using Application.Abstractions.Messaging;
using SharedKernel.Results;
using Microsoft.EntityFrameworkCore;

namespace Application.Features.Api.DonationRemote.MarkDelivered;

internal sealed class Handler(IAppDbContext db) : ICommandHandler<Command, Result<Response>>
{
    public async Task<Result<Response>> Handle(Command r, CancellationToken ct)
    {
        var alert = await db.DonationAlert.Include(a => a.Donation).ThenInclude(d => d!.Channel).FirstOrDefaultAsync(a => a.ID == r.AlertID, ct);
        if (alert is null || alert.Donation is null || alert.Donation.Channel is null)
        {
            return Result.Failure<Response>(Error.NotFound("DonationAlert.NotFound", "알림을 찾을 수 없습니다."));
        }

        if (alert.Donation.Channel.MemberID != r.RequesterMemberID)
        {
            return Result.Failure<Response>(Error.Forbidden("Remote.Forbidden", "권한이 없습니다."));
        }

        alert.MarkDelivered();
        await db.SaveChangesAsync(ct);

        return Result.Success(new Response(alert.ID, alert.Donation.Channel.WidgetToken!));
    }
}