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

namespace Musify.Application.Tracks;

public record GetTracksByUserIdQuery(
    long UserId,
    string? Name,
    int PageNumber,
    int PageSize)
    : IQuery<ErrorOr<PaginatedResponse<TrackApplicationResponse>>>;

public class GetTracksByUserIdQueryHandler(IDatabase database)
    : IQueryHandler<GetTracksByUserIdQuery, ErrorOr<PaginatedResponse<TrackApplicationResponse>>>
{
    public async ValueTask<ErrorOr<PaginatedResponse<TrackApplicationResponse>>> Handle(GetTracksByUserIdQuery request, CancellationToken cancellationToken)
    {
        var tracksQuery = database.Tracks
            .AsNoTracking()
            .Active()
            .Where(track => track.OwnerUserId == request.UserId);

        if (!string.IsNullOrWhiteSpace(request.Name))
        {
            var normalizedName = TextNormalizer.Normalize(request.Name);
            tracksQuery = tracksQuery.Where(track => track.NormalizedTitle.Contains(normalizedName));
        }

        return await tracksQuery
            .OrderByDescending(track => track.CreatedAt)
            .ThenBy(track => track.Id)
            .SelectResponse()
            .ToPaginatedAsync(new PageRequest(request.PageNumber, request.PageSize), cancellationToken);
    }
}