/*
 * 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('');
}

/**
 * Pick a song
 */
function getSong(res) {
  var name = dbName();
  console.log('Opening the database ' + name + '...');
  db = new sqlite3.Database(name, sqlite3.OPEN_READWRITE, function (error) {
    if (error) {
      throw error;
    }

    console.log('Pickling a song...');
    db.get('SELECT * FROM songs WHERE done_in IS NULL ORDER BY random() LIMIT 1', function (err, song) {
      if (err) {
        throw err;
      }

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

        db.get('SELECT * FROM lyrics WHERE song = ' + song.id, function (err, lyrics) {
          if (err) {
            throw err;
          }

          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);
        });
      });
    });
  });
}

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