var express = require('express');
var router = express.Router();

var playlists = [
  { id: 1, title: 'Rock', songs: [4,5,6,7] },
  { id: 2, title: 'Pop', songs: [1,2,3] },
  { id: 3, title: 'Jazz', songs: [8,9,10,11,12] }
];

router.get('/', function (req, res) {
  res.json(playlists);
});

router.param('id', function (req, res, next, id) {
  var item = playlists.filter(function (item) {
    return item.id == id;
  });
  req.playlistItem = item.length ? item[0] : null;
  next();
});

router.route('/:id')
  .get(function (req, res, next) {
    return req.playlistItem ? res.json(req.playlistItem) : next();
  })
  .post(function (req, res) {
    // create item
  })
  .put(function (req, res) {
    // update item
  })
  .delete(function (req, res) {
    // delete item
  });


// handle "/api/playlists/1/songs/" as well
router.use('/:id/songs', require('./songs'));


module.exports = router;