'use strict';

var IO;

var LESS_THAN = /</g, GREATER_THAN = />/g, AMPERSAND = /&/g;
function sanitize (s) {
  if (s)
    return s.replace(LESS_THAN, '&lt;').replace(GREATER_THAN, '&gt;').replace(AMPERSAND, '&amp;');
  return "";
}
function sanitizeJSON (json) {
  try {
    var data = JSON.parse(sanitize(json));
    return data;
  } catch (SyntaxError) {
    console.log('Invalid JSON: ' + json);
    return false;
  }
}

function Grid(){
  var base = this;
  var tempo = 125;
  var pattern = [
  	[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
  	[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
  	[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
  	[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
  	[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
  	[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
  	[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
  	[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
  	[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
  	[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
  	[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
  	[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
  	[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
  	[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
  	[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
  	[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
  ];
  function init(){
    bind();
  }
  function bind(){
  }
  base.getState = function(){
    return {
      'pattern': pattern,
      'tempo': tempo
    }
  }
  base.setNote = function(data){
    if (data.step < pattern.length && data.channel < pattern[data.step].length) {
      var state = data.state == 1 ? 1 : 0;
      pattern[data.step][data.channel] = state;
    }
  }
  init();
}

function Connection (socket) {
  var base = this;

  function init(){
    bind();
  }
  function bind(){
    socket.on('event-join', join);
    socket.on('event-mouse', mouse);
    socket.on('event-chat', chat);

    socket.on('event-note', note);
    socket.on('event-tempo', tempo);

    socket.on('disconnect', disconnect);
  }
  function join(json){
    socket.broadcast.emit("event-join", json);
    socket.emit("event-grid", grid.getState());
  }
  function mouse(json){
    socket.broadcast.emit("event-mouse", json);
  }
  function chat(json){
    socket.broadcast.emit("event-chat", json);
  }
  function note(json){
    var data = sanitizeJSON(json);
    if (data) {
      grid.setNote(data);
      socket.broadcast.emit("event-note", data);
    }
  }
  function tempo(json){
    socket.broadcast.emit("event-tempo", json);
  }
  function disconnect(json){
    base = null;
  }
  init();
}

var grid = new Grid ();

exports.connect = function(io, socket) {
  IO = IO || io;
  var user = new Connection (socket);
};