using FreeTubeSync.Model;

namespace FreeTubeSync.EndPoints;

public static class PlaylistEndpoint
{
    public static void MapPlaylistEndpoints(this WebApplication app)
    {
        var group = app.MapGroup("playlists");

        group.MapGet("/", GetAllPlaylists);
        group.MapGet("/{id}", GetPlaylist);
        group.MapPost("/", UpdatePlaylist);
        group.MapDelete("/{id}", RemovePlaylist);
    }

    private static async Task<IResult> GetAllPlaylists(IRepository<Playlist> repository, CancellationToken ct)
    {
        var results = await repository.GetAllAsync(ct);
        return Results.Ok(results);
    }

    private static async Task<IResult> GetPlaylist(IRepository<Playlist> repository, string id, CancellationToken ct)
    {
        var result = await repository.GetByIdAsync(id, ct);
        return result == null ? Results.NotFound() : Results.Ok(result);
    }

    private static async Task<IResult> UpdatePlaylist(IRepository<Playlist> repository, Playlist playlist, CancellationToken ct,
        ILogger<Program> logger)
    {
        var results = await repository.GetByIdAsync(playlist._id, ct);
        if (results == null)
        {
            try
            {
                logger.LogInformation("Playlist {id} does not exist, adding it to the database", playlist._id);
                await repository.AddAsync(playlist, ct);
            }
            catch (Exception)
            {
                logger.LogError("Failed to create Playlist {playlist}", playlist._id);
                return Results.StatusCode(500);
            }
        }
        else
        {
            logger.LogInformation("Playlist {id} exists, updating the databsae.", playlist._id);
            results.UpdateFrom(playlist);
            var toRemove = results.videos.Where(vid => !playlist.videos.Any(x => x.playlistItemId == vid.playlistItemId)).ToList();

            foreach (var vid in toRemove)
                results.videos.Remove(vid);

            foreach (var vid in playlist.videos)
            {
                var ovid = results.videos.FirstOrDefault(x => x.playlistItemId == vid.playlistItemId);
                if (ovid == null)
                    results.videos.Add(vid);
                else
                {
                    ovid.videoId = vid.videoId;
                    ovid.title = vid.title;
                    ovid.author = vid.author;
                    ovid.authorId = vid.authorId;
                    ovid.lengthSeconds = vid.lengthSeconds;
                    ovid.published = vid.published;
                    ovid.timeAdded = vid.timeAdded;
                    ovid.playlistItemId = vid.playlistItemId;
                    ovid.type = vid.type;
                }
            }
            await repository.UpdateAsync(results, ct);
        }

        return Results.Ok();
    }
    
    private static async Task<IResult> RemovePlaylist(IRepository<Playlist> repository, string id, CancellationToken ct)
    {
        var result = await repository.GetByIdAsync(id, ct);
        if (result == null) return Results.NotFound();
        await repository.DeleteAsync(result, ct);
        return Results.Ok();
    }
}