ColorGeneratorModule

/*! ColorGenerator v0.0.1 - MIT license */

'use strict';

/**
 * Module dependencies
 */

var hash = function(stringToHash) {

    var value = 1;

    for (var i = 0; i < stringToHash.length; i++) {
        value = value * parseInt(stringToHash.charCodeAt(i));
    };

    if(value < Math.pow(16, 6))
    {
        value = Math.pow(value, 6);
    }

    return value.toString(16);
}

/**
 * Module exports
 */

module.exports = ColorGenerator;
/**
 * @param str
 * @return {}
 * @api public
 */

function ColorGenerator(sourceString) {

    if (typeof sourceString !== 'string') throw (new Error('ColorGenerator was not passed a string'));

    var hex = hash(sourceString).substr(0, 6);
    var offset = 0.2;

    var r = parseInt(hex.substr(0, 2), 16),
        g = parseInt(hex.substr(2, 2), 16),
        b = parseInt(hex.substr(4, 2), 16);

    var lum = Math.sqrt(0.299 * r * r + 0.587 * g * g + 0.114 * b * b);

    var isDark = (lum < 128);

    if (!isDark) offset *= -1;

    var oRGB = [
        Math.round(Math.min(Math.max(0, r + (r * offset)), 255)),
        Math.round(Math.min(Math.max(0, g + (g * offset)), 255)),
        Math.round(Math.min(Math.max(0, b + (b * offset)), 255))
    ];

    var oHex = '',
        c;

    for (var i = 0; i < oRGB.length; i++) {
        c = oRGB[i].toString(16);
        oHex += ("00" + c).substr(c.length);
    };

    return {
        "hex": hex,
        "rgb": [r, g, b],
        "lum": lum,
        "isDark": isDark,
        "oRGB": oRGB,
        "oHex": oHex
    };
}