script.js

// global constants
var clueHoldTime = 500; //how long to hold each clue's light/sound
var cluePauseTime = 333 + (1/3); //how long to pause in between clues
var nextClueWaitTime = 500; //how long to wait before starting playback of the clue sequence

//Global Variables
var pattern = [];
var progress = 0;
var gamePlaying = false;
var tonePlaying = false;
var volume = 0.5;
var guessCounter = 0;

var strikes = 0;

function newPattern(){
  var patternList = [];
  for(let i=0; i<8; i++){
      patternList[i] = Math.floor(Math.random() * 6) + 1;
  }
  return patternList;
}

function startGame(){
  //initialize game variables
  progress = 0;
  pattern = newPattern();
  gamePlaying = true;
  document.getElementById("startBtn").classList.add("hidden");
  document.getElementById("stopBtn").classList.remove("hidden");
  playClueSequence();
}

function stopGame(){
  gamePlaying = false;
  document.getElementById("startBtn").classList.remove("hidden");
  document.getElementById("stopBtn").classList.add("hidden");
}

// Sound Synthesis Functions
const freqMap = {
  1: 233.3,
  2: 266.7,
  3: 300,
  4: 333.3,
  5: 366.7,
  6: 400
}
function playTone(btn,len){ 
  o.frequency.value = freqMap[btn]
  g.gain.setTargetAtTime(volume,context.currentTime + 0.05,0.025)
  context.resume()
  tonePlaying = true
  setTimeout(function(){
    stopTone()
  },len)
}
function startTone(btn){
  if(!tonePlaying){
    context.resume()
    o.frequency.value = freqMap[btn]
    g.gain.setTargetAtTime(volume,context.currentTime + 0.05,0.025)
    context.resume()
    tonePlaying = true
  }
}
function stopTone(){
  g.gain.setTargetAtTime(0,context.currentTime + 0.05,0.025)
  tonePlaying = false
}

// Page Initialization
// Init Sound Synthesizer
var AudioContext = window.AudioContext || window.webkitAudioContext 
var context = new AudioContext()
var o = context.createOscillator()
var g = context.createGain()
g.connect(context.destination)
g.gain.setValueAtTime(0,context.currentTime)
o.connect(g)
o.start(0)

function lightButton(btn){
  document.getElementById("button"+btn).classList.add("lit")
}
function clearButton(btn){
  document.getElementById("button"+btn).classList.remove("lit")
}

function playSingleClue(btn){
  if(gamePlaying){
    lightButton(btn);
    playTone(btn,clueHoldTime);
    setTimeout(clearButton,clueHoldTime,btn);
  }
}

function playClueSequence(){
  guessCounter = 0;
  let delay = nextClueWaitTime; //set delay to initial wait time
  for(let i=0;i<=progress;i++){ // for each clue that is revealed so far
    console.log("play single clue: " + pattern[i] + " in " + delay + "ms")
    setTimeout(playSingleClue,delay,pattern[i]) // set a timeout to play that clue
    delay += clueHoldTime 
    delay += cluePauseTime;
  }
}

function loseGame() {
  stopGame();
  alert("Game Over. You lost.");
  strikes = 0;
  clueHoldTime = 500;
  cluePauseTime = 333;
  nextClueWaitTime = 500;
}

function winGame() {
  stopGame();
  alert("Game Over. You won!");
  strikes = 0;
  clueHoldTime = 500;
  cluePauseTime = 333;
  nextClueWaitTime = 500;
}

function guess(btn){
  console.log("user guessed: " + btn);
  
  if(!gamePlaying){
    return;
  }
  
  if(pattern[guessCounter] == btn){
    //Guess was correct!
    if(guessCounter == progress){
      if(progress == pattern.length - 1){
        //GAME OVER: WIN!
        winGame();
      }else{
        //Pattern correct. Add next segment
        clueHoldTime -= 25
        cluePauseTime -= (25/6);
        nextClueWaitTime -= 25;
        progress++;
        playClueSequence();
      }
    }else{
      //so far so good... check the next guess
      guessCounter++;
    }
  }else{
    strikes++;
    if (strikes < 3) {
      alert('Strike ' + strikes);
      playClueSequence();
    }
    else{
      loseGame();
    }
  } 
}