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var Color = function () {};

/**
 * Figures out if a string is a hexadecimal or
 * string rendering of RGB (rgb(...)) and converts
 * it to an RGB object that we can parse
 * @param {string} string
 */
Color.prototype.stringToRGB = function (string) {

  // if rgb
  var rgbTest = /rgb\(/;
  if (rgbTest.test(string)) {
    return this.rgbStingToRGB(string);
  }

  // if hex
  var hexTest = /(#?([A-Fa-f0-9]){3}(([A-Fa-f0-9]){3})?)/;
  if (hexTest.test(string)) {
    return this.hexToRGB(string);
  }

  return null;

};

/**
 * Convert a hexadecimal color to RGB.
 * From: http://stackoverflow.com/a/5624139/2662151
 * @param {string} hex Hexadecimal color
 */
Color.prototype.hexToRGB = function (hex) {

  // Expand shorthand form (e.g. "03F") to full form (e.g. "0033FF")
  var shorthandRegex = /^#?([a-f\d])([a-f\d])([a-f\d])$/i;

  hex = hex.replace(shorthandRegex, function(m, r, g, b) {
      return r + r + g + g + b + b;
  });

  var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);

  return result ? {
      r: parseInt(result[1], 16),
      g: parseInt(result[2], 16),
      b: parseInt(result[3], 16)
  } : null;

};

Color.prototype.rgbStingToRGB = function (string) {

  var parts = string.replace("rgb(", "").replace(")", "").replace(" ", "").split(",");

  return {
    r: parts[0],
    g: parts[1],
    b: parts[2]
  };

};

Color.prototype.hex = function (x) {
  return ("0" + parseInt(x).toString(16)).slice(-2);
};

Color.prototype.rgb2hex = function (string) {

  if (/^#[0-9A-F]{6}$/i.test(string)) return string;

  string = string.match(/^rgb\((\d+),\s*(\d+),\s*(\d+)\)$/);

  return this.hex(string[1]) + this.hex(string[2]) + this.hex(string[3]);

};

/**
 * Return white if given a dark color.
 * Return black if given a light color.
 */
Color.prototype.getContrastingColor = function (r, g, b) {

  if (!g && !b) {

    var rgb = this.stringToRGB(r);
    if (!rgb) return null;

    r = rgb.r;
    g = rgb.g;
    b = rgb.b;

  }

  // W3C algorithm
  var o = Math.round(((parseInt(r) * 299) + (parseInt(g) * 587) + (parseInt(b) * 114)) / 1000);
  return o > 125 ? "000" : "fff";

};


module.exports = new Color();