LyricsPicker/lyricsnode/routes/round.js

/*
 * main page
 */

var sqlite3 = require('sqlite3');
var path = require('path');
var db;     // make it global

/**
 * db name
 */
function dbName() {
  return path.join(__dirname, '../../db/lyrics.sq3');
}

/**
 * turn a phrase into a list of acronyms
 */
function acronymize(phrase) {
  var letters = [];
  phrase.split(' ').forEach(function (elem, idx, array) {
    letters.push(elem[0].toUpperCase());
  });

  return letters.join('');
}

/***********************************************************************
 * Main page
 **********************************************************************/

/**
 * Pick a song
 */
function getSong(res) {
  var name = dbName();
  var db = null;
  var song = null;
  var artist = null;
  var lyrics = null;
  
  function pickSong() {
    console.log('Picking song...');
    db.get('SELECT * FROM songs WHERE done_in IS NULL ORDER BY random() LIMIT 1', function (err, selectSong) {
      if (err) {
        throw err;
      }

      song = selectSong;
      console.log(song);
      pickArtist();
    });
  }

  function pickArtist() {
    console.log('Retrieving artist for song...');
    db.get('SELECT * FROM artists WHERE id = ' + song.artist, function (err, selectArtist) {
      if (err) {
        throw err;
      }

      artist = selectArtist;
      console.log(artist);
      pickLyrics();
    });
  }

  function pickLyrics() {
    console.log('Retrieving lyrics for song... ');
    db.get('SELECT * FROM lyrics WHERE song = ' + song.id, function (err, selectLyrics) {
      if (err) {
        throw err;
      }

      lyrics = selectLyrics;
      console.log(lyrics);
      answer();
    });
  }

  function answer() {
    var params = {
      title: 'Round',
      lyrics: lyrics.lyrics,
      song_title: song.title,
      song_artist: artist.name,
      acronym_title: acronymize(song.title),
      acronym_artist: acronymize(artist.name),
      id: song.id
    };
    res.render('index', params);
  }
  
  console.log('Opening the database ' + name + '...');
  db = new sqlite3.Database(name, sqlite3.OPEN_READWRITE, function (error) {
    if (error) {
      throw error;
    }

    pickSong();
  });
}

exports.index = function (req, res) {
  getSong(res);
};


/***********************************************************************
 * Support for the small box with the "others" picks
 **********************************************************************/
exports.others = function (req, res) {
  console.log('Artist: ' + req.body.artist);
  console.log('Song: ' + req.body.song);
};