var quoteArray = [
  ["Be the change that you wish to see in the world.", "-Mahatma Gandhi"],
  ["People who think they know everything are a great annoyance to those of us who do.", "-Isaac Asimov"],
  ["The fool doth think he is wise, but the wise man knows himself to be a fool.", "-William Shakespeare"],
  ["If you don't stand for something you will fall for anything.", "Gordon A. Eadie"],
  ["I solemnly swear that I am up to no good.", "J.K. Rowling"]
];

var colorArray = [
  "#FF99FF", // pinkish-purple
  "#9999FF", // blue
  "#00CC00", // green
  "#FF6633", // orange
  "#FFCC00", // yellow
  "#999999", // gray
];

var numQuotes = quoteArray.length;
var numColors = colorArray.length;

var randomNum;

var randomColor;
var newRandomColor;

var randomColorNumber = 0;

// arrays each containing
// text at index 0
// and author at index 1
var quote;
var newQuote;

var twitterQuote = "";

$(document).ready(function() {
  // initialize quote to a random one
  randomNum = newRandomNumber();
  randomColor = newRandomColor();

  quote = newQuote(randomNum);
  twitterQuote = quote[0] + " " + quote[1];

  $("#quote-text").text(
    quote[0]);
  $("#quote-author").text(
    quote[1]);

  $("body").css("background-color", randomColor);
  $("#quote-text").css("color", randomColor);
  $("#quote-author").css("color", randomColor);
  $("#quote-box button").css("background-color", randomColor);
  $("i").css("color", randomColor);

  // whenever #new-quote-icon is clicked
  $("#new-quote-icon").on("click", function() {

    randomNum = newRandomNumber();
    randomColor = newRandomColor();

    quote = newQuote(randomNum);
    twitterQuote = quote[0] + " " + quote[1];

    $("#quote-text").text(
      quote[0]);
    $("#quote-author").text(
      quote[1]);

    $("body").css("background-color", randomColor);
    $("#quote-text").css("color", randomColor);
    $("#quote-author").css("color", randomColor);
    $("#quote-box button").css("background-color", randomColor);
    $("i").css("color", randomColor);

  }); // end of new quote function

  // when twitter icon is clicked
  $("#twitter-icon").on("click", function() {
    window.open("https://twitter.com/intent/tweet?text=" + twitterQuote);
  }); // end of twitter click function

}); // end of document ready function

// returns quote with index randomNum
function newQuote(randomNum) {
  return quoteArray[randomNum];
}

// returns number corresponding to
// quoteArray indices
function newRandomNumber() {
  var num = Math.floor(Math.random() * (numQuotes - 1));
  if (num >= randomNum) {
    num++;
  }
  return num;
}

// returns a new random color
// that is different than
// the current one
function newRandomColor() {
  var num = Math.floor(Math.random() * (numColors - 1));

  if (num >= randomColorNumber) {
    num++;
  }

  randomColorNumber = num;
  return colorArray[num];
}