var params = parseQueryParams();

// Set window title
if (params.name) document.title = params.name + " - Popup Timer";

var hours, minutes, seconds;
var secondsElem = document.getElementById("seconds");
var minutesElem = document.getElementById("minutes");
var hoursElem = document.getElementById("hours");
var playBtn = document.getElementById("play");
var progressBar = document.getElementById("progress-fg");
var timeout;
var timesUpStr = "[ TIME'S UP! ] ";
var lastPaused = -1;

// Init audio
var oscillator, audioContext;
if (params.beep === "true") {
  try {
    audioContext = new (window.AudioContext || window.webkitAudioContext);
  } catch(e) {}
}

// Autostart
if (params.autostart === "true") {

  switch (params.type) {
      
    case "timer":
      initTimer();
      startTimer(1000);
      break;
      
    case "stopwatch":
      initStopwatch();
      startStopwatch(1000);
      break;
      
    default:
      location.href = "/";
  } 

} 

// Reset timer/stopwatch
document.getElementById("restart").onclick = function() {
  
  if (timeout) clearTimeout(timeout);
  
  var paused = playBtn.classList.contains("fa-play");
  
  switch (params.type) {
    case "timer":
      
      // Reset progress bar
      // TODO
      progressBar.animationName = "";
      progressBar.animationName = "progress";
      
      initTimer();
      if (!paused) startTimer(1000);
      
      break;
    case "stopwatch":
      
      // Reset displayed time
      secondsElem.innerText = "00s";
      secondsElem.classList.remove("highlighted");
      minutesElem.innerText = "00m";
      minutesElem.classList.remove("highlighted");
      hoursElem.innerText = "00h";
      hoursElem.classList.remove("highlighted");
      
      initStopwatch();
      if (!paused) startStopwatch(1000);
      
      break;
  }
}

// Pause / Resume
playBtn.onclick = function() {
  
  if (!timeout) return;
  
  // Pause
  if (playBtn.classList.contains("fa-pause")) {
    
    lastPaused = Date.now();
    if (params.type === "timer") progressBar.style.animationPlayState = "paused";
    clearTimeout(timeout);
    
    // Change icon
    playBtn.classList.remove("fa-pause");
    playBtn.classList.add("fa-play");
    
  // Resume
  } else {
        
    var startOffset = lastPaused % 1000;
    
    switch (params.type) {
      case "timer":
        if (hours === 0 && minutes == 0 && seconds === 0) return;
        progressBar.style.animationPlayState = "running";
        startTimer(startOffset);
        break;
      case "stopwatch":
        startStopwatch(startOffset);
        break;
    } 
   
    // Change icon
    playBtn.classList.remove("fa-play");
    playBtn.classList.add("fa-pause");
    
  }
  
}

function initTimer() {
  
  hours = parseInt(params.h);
  minutes = parseInt(params.m);
  seconds = parseInt(params.s);

  if (hours === 0 && minutes === 0 && seconds === 0) return;

  // Only highlight relevant parts
  if (hours > 0) {
    hoursElem.classList.add("highlighted");
    minutesElem.classList.add("highlighted");
    secondsElem.classList.add("highlighted");
  } else if (minutes > 0) {
    minutesElem.classList.add("highlighted");
    secondsElem.classList.add("highlighted");
  } else {
    secondsElem.classList.add("highlighted");
  }

  // Print initial time
  hoursElem.innerText = pad(hours) + "h";
  minutesElem.innerText = pad(minutes) + "m";
  secondsElem.innerText = pad(seconds) + "s";

  // Animate progress bar
  var totalSeconds = (hours * 60 * 60) + (minutes * 60) + seconds;
  progressBar.style.animationDuration = totalSeconds + "s";
  progressBar.style.animationName = "progress";
  
}

function startTimer(startOffset) {

  playBtn.classList.remove("fa-play");
  playBtn.classList.add("fa-pause");
  
  // Wait the starting offset
  timeout = setTimeout(updateTimer, startOffset);

  document.getElementById("progress-fg").style.animationPlayState = "running";
  
}

function updateTimer() {
      
    seconds--;
    if (seconds === 0 && minutes === 0 && hours === 0) secondsElem.classList.remove("highlighted");
    if (seconds <= -1) {
      seconds = 59;

      minutes--;
      if (minutes === 0 && hours === 0) minutesElem.classList.remove("highlighted");
      if (minutes <= -1) {
        minutes = 59;

        hours--;
        if (hours === 0) hoursElem.classList.remove("highlighted");

        hoursElem.innerText = pad(hours) + "h";
      }
      minutesElem.innerText = pad(minutes) + "m";
    }
    secondsElem.innerText = pad(seconds) + "s";

    if (hours === 0 && minutes === 0 && seconds == 0) timeUp();
    else timeout = setTimeout(updateTimer, 1000);
    
}

// Makes the numbers blink red etc.
function timeUp() {
  
  var timeUpInterval = setInterval(function() {

    // Blink red
    [].slice.call(document.querySelectorAll("main > span")).forEach(function(elem) {
      elem.classList.toggle("red");
    });
    //document.querySelector

    // Blink title
    if (document.title.indexOf(timesUpStr) === -1) document.title = timesUpStr + document.title;
    else document.title = document.title.substr(timesUpStr.length);
    
    // Play beep
    if (params.beep === "true" && audioContext) {
      try {
        oscillator = audioContext.createOscillator();
        oscillator.type = "sine";
        oscillator.frequency.value = 1000;
        oscillator.connect(audioContext.destination);
        oscillator.start();
        oscillator.stop(audioContext.currentTime + 0.25);
      } catch(e) {}
    }

  }, 500);

  // Stop when user clicks
  document.onclick = function() {
    
    if (oscillator) oscillator.stop();
  
    // Reset color
    [].slice.call(document.querySelectorAll("main > span")).forEach(function(elem) {
      elem.classList.remove("red");
    });

    // Remove "TIME UP" from title
    if (document.title.indexOf(timesUpStr) !== -1) document.title = document.title.substr(timesUpStr.length);

    // Clean up
    clearInterval(timeUpInterval);
    document.onclick = null;
    
  }
  
}

function initStopwatch() {
  hours = 0;
  minutes = 0;
  seconds = 0;
}

function startStopwatch(startOffset) {
  
  playBtn.classList.remove("fa-play");
  playBtn.classList.add("fa-pause");

  timeout = setTimeout(updateStopwatch, startOffset);
  
}

function updateStopwatch() {

  // Update seconds
  seconds++;
  if (hours === 0 && minutes === 0 && seconds === 1) secondsElem.classList.add("highlighted");
  if (seconds >= 60) {
    seconds = 0;

    // Update minutes
    minutes++;
    if (hours === 0 && minutes === 1) minutesElem.classList.add("highlighted");
    if (minutes >= 60) {
      minutes = 0;

      // Update hours
      hours++;
      if (hours === 1) hoursElem.classList.add("highlighted");
      hoursElem.innerText = pad(hours) + "h";

    }
    // Minutes
    minutesElem.innerText = pad(minutes) + "m";

  }
  // Seconds
  secondsElem.innerText = pad(seconds) + "s";
  
  timeout = setTimeout(updateStopwatch, 1000);

}

function parseQueryParams() {
	if (location.search === "" || location.search.indexOf("?") !== 0) return {};
	var result = {};
	location.search.substr(1).split("&").forEach(function(str) {
		var key = str.split("=")[0];
		var value;
		if (str.split("=").length > 1) value = str.split("=")[1];
		else value = null;
		result[key] = value;
	});
	return result;
}

// Adds one leading zero if necessary
function pad(num) {
  return ("00" + num).substr(-2);
}