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/* global Fluid, CONFIG */

window.requestAnimationFrame = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame;

Fluid.utils = {

listenScroll: function(callback) {

var dbc = new Debouncer(callback);

window.addEventListener('scroll', dbc, false);

dbc.handleEvent();

return dbc;

},

unlistenScroll: function(callback) {

window.removeEventListener('scroll', callback);

},

scrollToElement: function(target, offset) {

var of = jQuery(target).offset();

if (of) {

jQuery('html,body').animate({

scrollTop: of.top + (offset || 0),

easing : 'swing'

});

}

},

elementVisible: function(element, offsetFactor) {

offsetFactor = offsetFactor && offsetFactor >= 0 ? offsetFactor : 0;

var rect = element.getBoundingClientRect();

var height = window.innerHeight || document.documentElement.clientHeight;

var top = rect.top;

return (top >= 0 && top <= height * (offsetFactor + 1))

|| (top <= 0 && top >= -(height * offsetFactor) - rect.height);

},

waitElementVisible: function(selectorOrElement, callback, offsetFactor) {

var runningOnBrowser = typeof window !== 'undefined';

var isBot = (runningOnBrowser && !('onscroll' in window))

|| (typeof navigator !== 'undefined' && /(gle|ing|ro|msn)bot|crawl|spider|yand|duckgo/i.test(navigator.userAgent));

if (!runningOnBrowser || isBot) {

return;

}

offsetFactor = offsetFactor && offsetFactor >= 0 ? offsetFactor : 0;

function waitInViewport(element) {

if (Fluid.utils.elementVisible(element, offsetFactor)) {

callback();

return;

}

if ('IntersectionObserver' in window) {

var io = new IntersectionObserver(function(entries, ob) {

if (entries[0].isIntersecting) {

callback();

ob.disconnect();

}

}, {

threshold : [0],

rootMargin: (window.innerHeight || document.documentElement.clientHeight) * offsetFactor + 'px'

});

io.observe(element);

} else {

var wrapper = Fluid.utils.listenScroll(function() {

if (Fluid.utils.elementVisible(element, offsetFactor)) {

Fluid.utils.unlistenScroll(wrapper);

callback();

}

});

}

}

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

this.waitElementLoaded(selectorOrElement, function(element) {

waitInViewport(element);

});

} else {

waitInViewport(selectorOrElement);

}

},

waitElementLoaded: function(selector, callback) {

var runningOnBrowser = typeof window !== 'undefined';

var isBot = (runningOnBrowser && !('onscroll' in window))

|| (typeof navigator !== 'undefined' && /(gle|ing|ro|msn)bot|crawl|spider|yand|duckgo/i.test(navigator.userAgent));

if (!runningOnBrowser || isBot) {

return;

}

if ('MutationObserver' in window) {

var mo = new MutationObserver(function(records, ob) {

var ele = document.querySelector(selector);

if (ele) {

callback(ele);

ob.disconnect();

}

});

mo.observe(document, { childList: true, subtree: true });

} else {

document.addEventListener('DOMContentLoaded', function() {

var waitLoop = function() {

var ele = document.querySelector(selector);

if (ele) {

callback(ele);

} else {

setTimeout(waitLoop, 100);

}

};

waitLoop();

});

}

},

createScript: function(url, onload) {

var s = document.createElement('script');

s.setAttribute('src', url);

s.setAttribute('type', 'text/javascript');

s.setAttribute('charset', 'UTF-8');

s.async = false;

if (typeof onload === 'function') {

if (window.attachEvent) {

s.onreadystatechange = function() {

var e = s.readyState;

if (e === 'loaded' || e === 'complete') {

s.onreadystatechange = null;

onload();

}

};

} else {

s.onload = onload;

}

}

var ss = document.getElementsByTagName('script');

var e = ss.length > 0 ? ss[ss.length - 1] : document.head || document.documentElement;

e.parentNode.insertBefore(s, e.nextSibling);

},

createCssLink: function(url) {

var l = document.createElement('link');

l.setAttribute('rel', 'stylesheet');

l.setAttribute('type', 'text/css');

l.setAttribute('href', url);

var e = document.getElementsByTagName('link')[0]

|| document.getElementsByTagName('head')[0]

|| document.head || document.documentElement;

e.parentNode.insertBefore(l, e);

},

loadComments: function(selector, loadFunc) {

var ele = document.querySelector('#comments[lazyload]');

if (ele) {

var callback = function() {

loadFunc();

ele.removeAttribute('lazyload');

};

Fluid.utils.waitElementVisible(selector, callback, CONFIG.lazyload.offset_factor);

} else {

loadFunc();

}

},

getBackgroundLightness(selectorOrElement) {

var ele = selectorOrElement;

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

ele = document.querySelector(selectorOrElement);

}

var view = ele.ownerDocument.defaultView;

if (!view) {

view = window;

}

var rgbArr = view.getComputedStyle(ele).backgroundColor.replace(/rgba*\(/, '').replace(')', '').split(/,\s*/);

if (rgbArr.length < 3) {

return 0;

}

var colorCast = (0.213 * rgbArr[0]) + (0.715 * rgbArr[1]) + (0.072 * rgbArr[2]);

return colorCast === 0 || colorCast > 255 / 2 ? 1 : -1;

}

};

/**

* Handles debouncing of events via requestAnimationFrame

* @see http://www.html5rocks.com/en/tutorials/speed/animations/

* @param {Function} callback The callback to handle whichever event

*/

function Debouncer(callback) {

this.callback = callback;

this.ticking = false;

}

Debouncer.prototype = {

constructor: Debouncer,

/**

* dispatches the event to the supplied callback

* @private

*/

update: function() {

this.callback && this.callback();

this.ticking = false;

},

/**

* ensures events don't get stacked

* @private

*/

requestTick: function() {

if (!this.ticking) {

requestAnimationFrame(this.rafCallback || (this.rafCallback = this.update.bind(this)));

this.ticking = true;

}

},

/**

* Attach this as the event listeners

*/

handleEvent: function() {

this.requestTick();

}

};