import Playlist from '../models/Playlist.js';
import Track from '../models/Track.js';

export const playlistController = {
  async list(req, res, next) {
    try {
      const playlists = await Playlist.find({ user: req.userId })
        .sort({ createdAt: -1 })
        .lean();
      res.json({ success: true, data: playlists });
    } catch (error) {
      next(error);
    }
  },

  async create(req, res, next) {
    try {
      const { name } = req.body;
      if (!name) {
        return res
          .status(400)
          .json({ success: false, message: 'Playlist name is required' });
      }

      const playlist = await Playlist.create({
        name,
        user: req.userId,
      });

      return res.json({ success: true, data: playlist });
    } catch (error) {
      next(error);
    }
  },

  async addTrack(req, res, next) {
    try {
      const { playlistId } = req.params;
      const { trackId } = req.body;

      if (!trackId) {
        return res
          .status(400)
          .json({ success: false, message: 'Track id is required' });
      }

      const exists = await Track.exists({ _id: trackId });
      if (!exists) {
        return res.status(404).json({ success: false, message: 'Track not found' });
      }

      const playlist = await Playlist.findOneAndUpdate(
        { _id: playlistId, user: req.userId },
        { $addToSet: { tracks: trackId } },
        { new: true }
      ).lean();

      if (!playlist) {
        return res.status(404).json({ success: false, message: 'Playlist not found' });
      }

      return res.json({ success: true, data: playlist });
    } catch (error) {
      next(error);
    }
  },
};