using ErrorOr;
using Mediator;
using Microsoft.EntityFrameworkCore;
using Musify.Application.Albums.Responses;
using Musify.Application.Contracts;
using Musify.Application.Shared;

namespace Musify.Application.Albums;

public record GetAlbumByIdQuery(Guid Id)
    : IQuery<ErrorOr<AlbumApplicationResponse>>;

public class GetAlbumByIdQueryHandler(IDatabase database)
    : IQueryHandler<GetAlbumByIdQuery, ErrorOr<AlbumApplicationResponse>>
{
    public async ValueTask<ErrorOr<AlbumApplicationResponse>> Handle(GetAlbumByIdQuery request, CancellationToken cancellationToken)
    {
        var album = await database.Albums
            .AsNoTracking()
            .Active()
            .Where(a => a.Id == request.Id)
            .SelectResponse()
            .SingleOrDefaultAsync(cancellationToken);

        return album == null
            ? AppErrors.NotFound("Album", request.Id)
            : album;
    }
}