// randomColor by David Merfield under the CC0 license
// https://github.com/davidmerfield/randomColor/

;(function(root, factory) {

  // Support AMD
  if (typeof define === 'function' && define.amd) {
  define([], factory);

  // Support CommonJS
  } else if (typeof exports === 'object') {
  var randomColor = factory();

  // Support NodeJS & Component, which allow module.exports to be a function
  if (typeof module === 'object' && module && module.exports) {
    exports = module.exports = randomColor;
  }

  // Support CommonJS 1.1.1 spec
  exports.randomColor = randomColor;

  // Support vanilla script loading
  } else {
  root.randomColor = factory();
  }

}(this, function() {

  // Seed to get repeatable colors
  var seed = null;

  // Shared color dictionary
  var colorDictionary = {};

  // Populate the color dictionary
  loadColorBounds();

  var randomColor = function (options) {

  options = options || {};

  // Check if there is a seed and ensure it's an
  // integer. Otherwise, reset the seed value.
  if (options.seed !== undefined && options.seed !== null && options.seed === parseInt(options.seed, 10)) {
    seed = options.seed;

  // A string was passed as a seed
  } else if (typeof options.seed === 'string') {
    seed = stringToInteger(options.seed);

  // Something was passed as a seed but it wasn't an integer or string
  } else if (options.seed !== undefined && options.seed !== null) {
    throw new TypeError('The seed value must be an integer or string');

  // No seed, reset the value outside.
  } else {
    seed = null;
  }

  var H,S,B;

  // Check if we need to generate multiple colors
  if (options.count !== null && options.count !== undefined) {

    var totalColors = options.count,
      colors = [];

    options.count = null;

    while (totalColors > colors.length) {

    // Since we're generating multiple colors,
    // incremement the seed. Otherwise we'd just
    // generate the same color each time...
    if (seed && options.seed) options.seed += 1;

    colors.push(randomColor(options));
    }

    options.count = totalColors;

    return colors;
  }

  // First we pick a hue (H)
  H = pickHue(options);

  // Then use H to determine saturation (S)
  S = pickSaturation(H, options);

  // Then use S and H to determine brightness (B).
  B = pickBrightness(H, S, options);

  // Then we return the HSB color in the desired format
  return setFormat([H,S,B], options);
  };

  function pickHue (options) {

  var hueRange = getHueRange(options.hue),
    hue = randomWithin(hueRange);

  // Instead of storing red as two seperate ranges,
  // we group them, using negative numbers
  if (hue < 0) {hue = 360 + hue;}

  return hue;

  }

  function pickSaturation (hue, options) {

  if (options.luminosity === 'random') {
    return randomWithin([0,100]);
  }

  if (options.hue === 'monochrome') {
    return 0;
  }

  var saturationRange = getSaturationRange(hue);

  var sMin = saturationRange[0],
    sMax = saturationRange[1];

  switch (options.luminosity) {

    case 'bright':
    sMin = 55;
    break;

    case 'dark':
    sMin = sMax - 10;
    break;

    case 'light':
    sMax = 55;
    break;
   }

  return randomWithin([sMin, sMax]);

  }

  function pickBrightness (H, S, options) {

  var bMin = getMinimumBrightness(H, S),
    bMax = 100;

  switch (options.luminosity) {

    case 'dark':
    bMax = bMin + 20;
    break;

    case 'light':
    bMin = (bMax + bMin)/2;
    break;

    case 'random':
    bMin = 0;
    bMax = 100;
    break;
  }

  return randomWithin([bMin, bMax]);
  }

  function setFormat (hsv, options) {

  switch (options.format) {

    case 'hsvArray':
    return hsv;

    case 'hslArray':
    return HSVtoHSL(hsv);

    case 'hsl':
    var hsl = HSVtoHSL(hsv);
    return 'hsl('+hsl[0]+', '+hsl[1]+'%, '+hsl[2]+'%)';

    case 'hsla':
    var hslColor = HSVtoHSL(hsv);
    return 'hsla('+hslColor[0]+', '+hslColor[1]+'%, '+hslColor[2]+'%, ' + Math.random() + ')';

    case 'rgbArray':
    return HSVtoRGB(hsv);

    case 'rgb':
    var rgb = HSVtoRGB(hsv);
    return 'rgb(' + rgb.join(', ') + ')';

    case 'rgba':
    var rgbColor = HSVtoRGB(hsv);
    return 'rgba(' + rgbColor.join(', ') + ', ' + Math.random() + ')';

    default:
    return HSVtoHex(hsv);
  }

  }

  function getMinimumBrightness(H, S) {

  var lowerBounds = getColorInfo(H).lowerBounds;

  for (var i = 0; i < lowerBounds.length - 1; i++) {

    var s1 = lowerBounds[i][0],
      v1 = lowerBounds[i][1];

    var s2 = lowerBounds[i+1][0],
      v2 = lowerBounds[i+1][1];

    if (S >= s1 && S <= s2) {

     var m = (v2 - v1)/(s2 - s1),
       b = v1 - m*s1;

     return m*S + b;
    }

  }

  return 0;
  }

  function getHueRange (colorInput) {

  if (typeof parseInt(colorInput) === 'number') {

    var number = parseInt(colorInput);

    if (number < 360 && number > 0) {
    return [number, number];
    }

  }

  if (typeof colorInput === 'string') {

    if (colorDictionary[colorInput]) {
    var color = colorDictionary[colorInput];
    if (color.hueRange) {return color.hueRange;}
    }
  }

  return [0,360];

  }

  function getSaturationRange (hue) {
  return getColorInfo(hue).saturationRange;
  }

  function getColorInfo (hue) {

  // Maps red colors to make picking hue easier
  if (hue >= 334 && hue <= 360) {
    hue-= 360;
  }

  for (var colorName in colorDictionary) {
     var color = colorDictionary[colorName];
     if (color.hueRange &&
       hue >= color.hueRange[0] &&
       hue <= color.hueRange[1]) {
      return colorDictionary[colorName];
     }
  } return 'Color not found';
  }

  function randomWithin (range) {
  if (seed === null) {
    return Math.floor(range[0] + Math.random()*(range[1] + 1 - range[0]));
  } else {
    //Seeded random algorithm from http://indiegamr.com/generate-repeatable-random-numbers-in-js/
    var max = range[1] || 1;
    var min = range[0] || 0;
    seed = (seed * 9301 + 49297) % 233280;
    var rnd = seed / 233280.0;
    return Math.floor(min + rnd * (max - min));
  }
  }

  function HSVtoHex (hsv){

  var rgb = HSVtoRGB(hsv);

  function componentToHex(c) {
    var hex = c.toString(16);
    return hex.length == 1 ? '0' + hex : hex;
  }

  var hex = '#' + componentToHex(rgb[0]) + componentToHex(rgb[1]) + componentToHex(rgb[2]);

  return hex;

  }

  function defineColor (name, hueRange, lowerBounds) {

  var sMin = lowerBounds[0][0],
    sMax = lowerBounds[lowerBounds.length - 1][0],

    bMin = lowerBounds[lowerBounds.length - 1][1],
    bMax = lowerBounds[0][1];

  colorDictionary[name] = {
    hueRange: hueRange,
    lowerBounds: lowerBounds,
    saturationRange: [sMin, sMax],
    brightnessRange: [bMin, bMax]
  };

  }

  function loadColorBounds () {

  defineColor(
    'monochrome',
    null,
    [[0,0],[100,0]]
  );

  defineColor(
    'red',
    [-26,18],
    [[20,100],[30,92],[40,89],[50,85],[60,78],[70,70],[80,60],[90,55],[100,50]]
  );

  defineColor(
    'orange',
    [19,46],
    [[20,100],[30,93],[40,88],[50,86],[60,85],[70,70],[100,70]]
  );

  defineColor(
    'yellow',
    [47,62],
    [[25,100],[40,94],[50,89],[60,86],[70,84],[80,82],[90,80],[100,75]]
  );

  defineColor(
    'green',
    [63,178],
      [[30,100],[40,90],[50,85],[60,81],[70,74],[80,64],[90,50],[100,40]]
    );

    defineColor(
      'blue',
      [179, 257],
      [[20,100],[30,86],[40,80],[50,74],[60,60],[70,52],[80,44],[90,39],[100,35]]
    );

    defineColor(
      'purple',
      [258, 282],
      [[20,100],[30,87],[40,79],[50,70],[60,65],[70,59],[80,52],[90,45],[100,42]]
    );

    defineColor(
      'pink',
      [283, 334],
      [[20,100],[30,90],[40,86],[60,84],[80,80],[90,75],[100,73]]
    );

  }

  function HSVtoRGB (hsv) {

    // this doesn't work for the values of 0 and 360
    // here's the hacky fix
    var h = hsv[0];
    if (h === 0) {h = 1;}
    if (h === 360) {h = 359;}

    // Rebase the h,s,v values
    h = h/360;
    var s = hsv[1]/100,
        v = hsv[2]/100;

    var h_i = Math.floor(h*6),
      f = h * 6 - h_i,
      p = v * (1 - s),
      q = v * (1 - f*s),
      t = v * (1 - (1 - f)*s),
      r = 256,
      g = 256,
      b = 256;

    switch(h_i) {
      case 0: r = v; g = t; b = p;  break;
      case 1: r = q; g = v; b = p;  break;
      case 2: r = p; g = v; b = t;  break;
      case 3: r = p; g = q; b = v;  break;
      case 4: r = t; g = p; b = v;  break;
      case 5: r = v; g = p; b = q;  break;
    }

    var result = [Math.floor(r*255), Math.floor(g*255), Math.floor(b*255)];
    return result;
  }

  function HSVtoHSL (hsv) {
    var h = hsv[0],
      s = hsv[1]/100,
      v = hsv[2]/100,
      k = (2-s)*v;

    return [
      h,
      Math.round(s*v / (k<1 ? k : 2-k) * 10000) / 100,
      k/2 * 100
    ];
  }

  function stringToInteger (string) {
    var total = 0
    for (var i = 0; i !== string.length; i++) {
      if (total >= Number.MAX_SAFE_INTEGER) break;
      total += string.charCodeAt(i)
    }
    return total
  }

  return randomColor;
}));
