/**
 * Social Likes
 * http://sapegin.github.com/social-likes
 *
 * Sharing buttons for Russian and worldwide social networks.
 * jQuery removed, only requires simple utilities: GET, onDomReady, http_build_query, addListener, removeListener
 *
 * @author Artem Sapegin, Vitaliy Filippov
 * @copyright 2014 Artem Sapegin (sapegin.me), 2016 Vitaliy Filippov
 * @license MIT
 */
/*jshint -W030 */

(function() {
	'use strict';

	var prefix = 'social-likes';
	var classPrefix = prefix + '__';
	var openClass = prefix + '_opened';
	var protocol = location.protocol === 'https:' ? 'https:' : 'http:';
	var isHttps = protocol === 'https:';

	function hasClass(e, cls, remove)
	{
		var p = -1, r = false;
		while ((p = e.className.indexOf(cls, p+1)) != -1)
		{
			if ((!p || /\s/.exec(e.className.charAt(p-1))) &&
				(p == e.className.length-cls.length || /\s/.exec(e.className.charAt(p+cls.length))))
			{
				r = true;
				if (remove)
					e.className = e.className.substr(0, p-1)+e.className.substr(p+cls.length);
			}
		}
		return r;
	}
	function getScript(url, onsuccess, onerror)
	{
		var node = document.createElement('script');
		node.type = 'text/javascript';
		node.src = url;
		node.onreadystatechange = function(node)
		{
			if (node.readyState == 'complete')
			{
				var head = document.head || document.getElementsByTagName('head')[0];
				head.appendChild(node);
				onsuccess && onsuccess();
			}
			else if (node.readyState == 'loaded')
			{
				node.children; // IE hack
				if (node.readyState == 'loading')
					onerror && onerror();
			}
		};
	}

	/**
	 * Buttons
	 */
	var services = {
		facebook: {
			// https://developers.facebook.com/docs/reference/fql/link_stat/
			counterUrl: 'https://graph.facebook.com/fql?q=SELECT+total_count+FROM+link_stat+WHERE+url%3D%22{url}%22&callback=?',
			convertNumber: function(data) {
				return data.data[0].total_count;
			},
			popupUrl: 'https://www.facebook.com/sharer/sharer.php?u={url}',
			popupWidth: 600,
			popupHeight: 359
		},
		twitter: {
			popupUrl: 'https://twitter.com/intent/tweet?url={url}&text={title}',
			popupWidth: 600,
			popupHeight: 250,
			click: function() {
				// Add colon to improve readability
				if (!/[\.\?:\-–—]\s*$/.test(this.options.title)) this.options.title += ':';
				return true;
			}
		},
		mailru: {
			counterUrl: protocol + '//connect.mail.ru/share_count?url_list={url}&callback=1&func=?',
			convertNumber: function(data) {
				for (var url in data) {
					if (data.hasOwnProperty(url)) {
						return data[url].shares;
					}
				}
			},
			popupUrl: 'https://connect.mail.ru/share?share_url={url}&title={title}',
			popupWidth: 492,
			popupHeight: 500
		},
		vkontakte: {
			counterUrl: 'https://vk.com/share.php?act=count&url={url}&index={index}',
			counter: function(jsonUrl, deferred) {
				var options = services.vkontakte;
				if (!options._) {
					options._ = [];
					if (!window.VK) window.VK = {};
					window.VK.Share = {
						count: function(idx, number) {
							options._[idx].resolve(number);
						}
					};
				}

				var index = options._.length;
				options._.push(deferred);
				getScript(makeUrl(jsonUrl, {index: index}), null, function() { deferred.reject(); });
			},
			popupUrl: 'https://vk.com/share.php?url={url}&title={title}',
			popupWidth: 655,
			popupHeight: 450
		},
		odnoklassniki: {
			counterUrl: protocol + '//connect.ok.ru/dk?st.cmd=extLike&ref={url}&uid={index}',
			counter: function(jsonUrl, deferred) {
				var options = services.odnoklassniki;
				if (!options._) {
					options._ = [];
					if (!window.ODKL) window.ODKL = {};
					window.ODKL.updateCount = function(idx, number) {
						options._[idx].resolve(number);
					};
				}

				var index = options._.length;
				options._.push(deferred);
				getScript(makeUrl(jsonUrl, {index: index}), null, function() { deferred.reject(); });
			},
			popupUrl: 'https://connect.ok.ru/dk?st.cmd=WidgetSharePreview&service=odnoklassniki&st.shareUrl={url}',
			popupWidth: 580,
			popupHeight: 336
		},
		plusone: {
			counterUrl: protocol + '//share.yandex.ru/gpp.xml?url={url}&callback=?',
			convertNumber: function(number) {
				return parseInt(number.replace(/\D/g, ''), 10);
			},
			popupUrl: 'https://plus.google.com/share?url={url}',
			popupWidth: 500,
			popupHeight: 550
		},
		pinterest: {
			counterUrl: protocol + '//api.pinterest.com/v1/urls/count.json?url={url}&callback=?',
			convertNumber: function(data) {
				return data.count;
			},
			popupUrl: 'https://pinterest.com/pin/create/button/?url={url}&description={title}',
			popupWidth: 740,
			popupHeight: 550
		}
	};


	/**
	 * Counters manager
	 */
	var counters = {
		promises: {},
		fetch: function(service, url, extraOptions) {
			if (!counters.promises[service]) counters.promises[service] = {};
			var servicePromises = counters.promises[service];

			if (!extraOptions.forceUpdate && servicePromises[url])
				return servicePromises[url];
			else
			{
				var options = {};
				for (var i in services[service])
					options[i] = services[service][i];
				for (i in extraOptions)
					options[i] = extraOptions[i];
				var deferred = { resolve: function(v) {}, reject: function() {} };
				var jsonUrl = options.counterUrl && makeUrl(options.counterUrl, {url: url});

				if (jsonUrl && typeof options.counter == 'function')
					options.counter(jsonUrl, deferred);
				else if (options.counterUrl)
				{
					GET(jsonUrl, function(r, d)
					{
						if (!r.responseText)
							deferred.reject();
						else
						{
							var number = d||r.responseText;
							try
							{
								if (typeof options.convertNumber == 'function')
									number = options.convertNumber(number);
								deferred.resolve(number);
							}
							catch (e)
							{
								deferred.reject();
							}
						}
					});
				}
				else
					deferred.reject();

				servicePromises[url] = deferred;
				return servicePromises[url];
			}
		}
	};


	/**
	 * jQuery plugin
	 */
	window.socialLikes = function(element, options) {
		var instance = element['__'+prefix];
		if (instance) {
			if (typeof options == 'object') {
				instance.update(options);
			}
		}
		else {
			var c = {}, o = dataToOptions(element);
			for (var i in window.socialLikes.defaults)
				c[i] = window.socialLikes.defaults[i];
			for (i in options)
				c[i] = options[i];
			for (i in o)
				c[i] = o[i];
			instance = new SocialLikes(element, c);
			element['__'+prefix] = instance;
		}
	};

	window.socialLikes.defaults = {
		url: window.location.href.replace(window.location.hash, ''),
		title: document.title,
		counters: true,
		zeroes: false,
		wait: 500,  // Show buttons only after counters are ready or after this amount of time
		timeout: 10000,  // Show counters after this amount of time even if they aren’t ready
		popupCheckInterval: 500,
		singleTitle: 'Share'
	};

	function SocialLikes(container, options) {
		this.container = container;
		this.options = options;
		this.init();
	}

	SocialLikes.prototype = {
		init: function() {
			var self = this;

			// Add class in case of manual initialization
			if (!hasClass(this.container, prefix))
				this.container.className += ' '+prefix;

			this.single = hasClass(this.container, prefix+'_single');

			this.initUserButtons();

			this.countersLeft = 0;
			this.number = 0;
			this.container['on_counter.' + prefix] = function(e) { return self.updateCounter(e); };

			this.makeSingleButton();

			this.buttons = [];
			for (var i = 0; i < this.container.children.length; i++)
			{
				var button = new Button(this.container.children[i], this.options);
				this.buttons.push(button);
				if (button.options.counterUrl)
					this.countersLeft++;
			}

			if (this.options.counters)
			{
				this.timer = setTimeout(function() { self.appear(); }, this.options.wait);
				this.timeout = setTimeout(function() { self.ready(); }, this.options.timeout);
			}
			else
				this.appear();
		},
		initUserButtons: function() {
			if (!this.userButtonInited && window.socialLikesButtons) {
				for (var i in window.socialLikesButtons) {
					services[i] = services[i] || {};
					for (var j in window.socialLikesButtons[i])
						services[i][j] = window.socialLikesButtons[i][j];
				}
			}
			this.userButtonInited = true;
		},
		makeSingleButton: function() {
			if (!this.single) return;

			var container = this.container;
			container.className += ' ' + prefix + '_vertical';
			var wrapper = document.createElement('div');
			wrapper.className = prefix + '_single-w';
			container.parentNode.insertBefore(wrapper, container);
			wrapper.appendChild(container);
			var d = document.createElement('div');
			d.className = prefix + '__single-container';
			while (container.firstChild)
				d.appendChild(container.firstChild);
			container.appendChild(d);

			// Widget
			var widget = document.createElement('div');
			widget.className = getElementClassNames('widget', 'single');
			widget.innerHTML = '<div class="'+getElementClassNames('button', 'single')+
				'"><span class="'+getElementClassNames('icon', 'single')+'"></span>'+
				this.options.singleTitle+'</div>';
			wrapper.appendChild(widget);

			addListener(widget, 'click', function() {
				var activeClass = prefix+'__widget_active';
				if (!hasClass(widget, activeClass, true)) {
					widget.className += ' '+activeClass;
					container.style.left = ((widget.offsetWidth-container.offsetWidth)/2)+'px';
					container.style.top = -container.offsetHeight+'px';
					showInViewport(container);
					closeOnClick(container, function() {
						hasClass(widget, activeClass, true);
					});
				}
				else {
					hasClass(container, openClass, true);
				}
				return false;
			});

			this.widget = widget;
		},
		update: function(options) {
			if (!options.forceUpdate && options.url === this.options.url) return;

			// Reset counters
			this.number = 0;
			this.countersLeft = this.buttons.length;
			if (this.widget)
			{
				var e = this.widget.querySelector('.' + prefix + '__counter');
				if (e) e.parentNode.removeChild(e);
			}

			// Update options
			for (var i in options)
				this.options[i] = options[i];
			for (var buttonIdx = 0; buttonIdx < this.buttons.length; buttonIdx++)
				this.buttons[buttonIdx].update(options);
		},
		updateCounter: function(e, service, number) {
			number = number || 0;

			if (number || this.options.zeroes) {
				this.number += number;
				if (this.single) {
					this.getCounterElem().text(this.number);
				}
			}

			if (this.countersLeft === 0) {
				this.appear();
				this.ready();
			}
			this.countersLeft--;
		},
		appear: function() {
			this.container.className += ' '+prefix+'_visible';
		},
		ready: function(silent) {
			if (this.timeout) {
				clearTimeout(this.timeout);
			}
			this.container.className += ' '+prefix+'_ready';
			if (!silent) {
				var e = this.container['on_ready.'+prefix];
				if (e) e(this.number);
			}
		},
		getCounterElem: function() {
			var counterElem = this.widget.querySelector('.' + classPrefix + 'counter_single');
			if (!counterElem.length) {
				counterElem = document.createElement('span');
				counterElem.className = getElementClassNames('counter', 'single');
				this.widget.append(counterElem);
			}
			return counterElem;
		}
	};


	function Button(widget, options) {
		this.widget = widget;
		this.options = {};
		for (var i in options)
			this.options[i] = options[i];
		this.detectService();
		if (this.service) {
			this.init();
		}
	}

	Button.prototype = {
		init: function() {
			this.detectParams();
			this.initHtml();
			var self = this;
			setTimeout(function() { self.initCounter(); }, 0);
		},

		update: function(options) {
			this.options.forceUpdate = false;
			for (var i in options)
				this.options[i] = options[i];
			var e = this.widget.querySelector('.' + prefix + '__counter');
			if (e) e.parentNode.removeChild(e); // Remove old counter
			this.initCounter();
		},

		detectService: function() {
			var service = this.widget.getAttribute('data-service');
			if (!service) {
				// class="facebook"
				var classes = this.widget.classList || this.widget.className.split(' ');
				for (var classIdx = 0; classIdx < classes.length; classIdx++) {
					var cls = classes[classIdx];
					if (services[cls]) {
						service = cls;
						break;
					}
				}
				if (!service) return;
			}
			this.service = service;
			for (var i in services[service])
				this.options[i] = services[service][i];
		},

		detectParams: function() {
			// Custom page counter URL or number
			var c = this.widget.getAttribute('data-counter');
			if (c) {
				var number = parseInt(c, 10);
				if (isNaN(number))
					this.options.counterUrl = c;
				else
					this.options.counterNumber = number;
			}

			// Custom page title
			c = this.widget.getAttribute('data-title');
			if (c)
				this.options.title = c;

			// Custom page URL
			c = this.widget.getAttribute('data-url');
			if (c)
				this.options.url = c;
		},

		initHtml: function() {
			var self = this;
			var options = this.options;
			var widget = this.widget;

			// Old initialization HTML
			var a = widget.querySelector('a');
			if (a)
				this.cloneDataAttrs(a, widget);

			// Button
			var button = document.createElement('span');
			button.className = this.getElementClassNames('button');
			button.innerHTML = widget.innerHTML;
			if (options.clickUrl) {
				var url = makeUrl(options.clickUrl, {
					url: options.url,
					title: options.title
				});
				var link = document.createElement('a');
				link.href = url;
				this.cloneDataAttrs(widget, link);
				widget.parentNode.insertBefore(link, widget);
				widget.parentNode.removeChild(widget);
				this.widget = widget = link;
			}
			else {
				addListener(widget, 'click', function() { self.click(); });
			}

			widget.className = widget.className.replace(' '+this.service, '') + ' '+this.getElementClassNames('widget');

			// Icon
			var s = document.createElement('span');
			s.className = this.getElementClassNames('icon');
			button.children.length ? button.insertBefore(s, button.firstChild) : button.appendChild(s);

			widget.innerHTML = '';
			widget.appendChild(button);
			this.button = button;
		},

		initCounter: function() {
			if (this.options.counters) {
				if (this.options.counterNumber) {
					this.updateCounter(this.options.counterNumber);
				}
				else {
					var extraOptions = {
						counterUrl: this.options.counterUrl,
						forceUpdate: this.options.forceUpdate
					};
					var self = this;
					var r = counters.fetch(this.service, this.options.url, extraOptions);
					r.reject = r.resolve = function(n) { self.updateCounter(n); };
				}
			}
		},

		cloneDataAttrs: function(source, destination) {
			for (var i = 0; i < source.attributes.length; i++)
				if (source.attributes[i].name.substr(0, 5) == 'data-')
					destination.setAttribute(source.attributes[i].name, source.attributes[i].value);
		},

		getElementClassNames: function(elem) {
			return getElementClassNames(elem, this.service);
		},

		updateCounter: function(number) {
			number = parseInt(number, 10) || 0;

			var counterElem = document.createElement('span');
			if (!number && !this.options.zeroes)
				counterElem.className = this.getElementClassNames('counter') + ' ' + prefix + '__counter_empty';
			else
			{
				counterElem.innerHTML = number;
				counterElem.className = this.getElementClassNames('counter');
			}
			this.widget.appendChild(counterElem);

			var e = this.widget['on_counter.'+prefix];
			if (e) e([this.service, number]);
		},

		click: function(e) {
			var options = this.options;
			var process = true;
			if (typeof options.click == 'function') {
				process = options.click.call(this, e);
			}
			if (process) {
				var url = makeUrl(options.popupUrl, {
					url: options.url,
					title: options.title
				});
				url = this.addAdditionalParamsToUrl(url);
				this.openPopup(url, {
					width: options.popupWidth,
					height: options.popupHeight
				});
			}
			return false;
		},

		addAdditionalParamsToUrl: function(url) {
			var params = dataToOptions(this.widget);
			for (var i in this.options.data)
				params[i] = this.options.data[i];
			var s = '';
			for (i in params)
				s += '&'+encodeURIComponent(i)+'='+encodeURIComponent(params[i]);
			if (!s)
				return url;
			if (!url.indexOf('?'))
				s = '?'+s.substr(1);
			return url + s;
		},

		openPopup: function(url, params) {
			var left = Math.round(screen.width/2 - params.width/2);
			var top = 0;
			if (screen.height > params.height) {
				top = Math.round(screen.height/3 - params.height/2);
			}

			var win = window.open(url, 'sl_' + this.service, 'left=' + left + ',top=' + top + ',' +
			   'width=' + params.width + ',height=' + params.height + ',personalbar=0,toolbar=0,scrollbars=1,resizable=1');
			if (win) {
				win.focus();
				var e = this.widget['on_popup_opened.' + prefix];
				if (e) e([this.service, win]);
				var self = this;
				var timer = setInterval(function() {
					if (!win.closed) return;
					clearInterval(timer);
					var e = self.widget['on_popup_closed.' + prefix];
					if (e) e(self.service);
				}, this.options.popupCheckInterval);
			}
			else {
				location.href = url;
			}
		}
	};


	/**
	 * Helpers
	 */

	// Camelize data-attributes
	function dataToOptions(elem, nocamel)
	{
		function upper(m, l)
		{
			return l.toUpper();
		}
		var options = {};
		for (var i = 0; i < elem.attributes.length; i++)
		{
			var key = elem.attributes[i].name;
			if (key.substr(0, 5) == 'data-')
			{
				key = key.substr(5);
				var value = elem.attributes[i].value;
				if (value === 'yes') value = true;
				else if (value === 'no') value = false;
				options[nocamel ? key : key.replace(/-(\w)/g, upper)] = value;
			}
		}
		return options;
	}

	function makeUrl(url, context) {
		return template(url, context, encodeURIComponent);
	}

	function template(tmpl, context, filter) {
		return tmpl.replace(/\{([^\}]+)\}/g, function(m, key) {
			// If key doesn't exists in the context we should keep template tag as is
			return key in context ? (filter ? filter(context[key]) : context[key]) : m;
		});
	}

	function getElementClassNames(elem, mod) {
		var cls = classPrefix + elem;
		return cls + ' ' + cls + '_' + mod;
	}

	function closeOnClick(elem, callback)
	{
		function handler(e)
		{
			if (e.type === 'keydown' && e.which !== 27)
				return;
			for (var i = e; i && i != elem; i = i.parentNode) {}
			if (i == elem)
				return;
			hasClass(elem, openClass, true);
			removeListener(document, 'click', handler);
			removeListener(document, 'touchstart', handler);
			removeListener(document, 'keydown', handler);
			callback();
		}
		var events = 'click touchstart keydown';
		addListener(document, 'click', handler);
		addListener(document, 'touchstart', handler);
		addListener(document, 'keydown', handler);
	}

	function showInViewport(elem) {
		var offset = 10;
		if (document.documentElement.getBoundingClientRect) {
			var left = parseInt(elem.style.left, 10);
			var top = parseInt(elem.style.top, 10);

			var rect = elem[0].getBoundingClientRect();
			if (rect.left < offset)
				elem.stype.left = (offset - rect.left + left)+'px';
			else if (rect.right > window.innerWidth - offset)
				elem.style.left = (window.innerWidth - rect.right - offset + left)+'px';

			if (rect.top < offset)
				elem.style.top = (offset - rect.top + top)+'px';
			else if (rect.bottom > window.innerHeight - offset)
				elem.style.top = (window.innerHeight - rect.bottom - offset + top)+'px';
		}
		elem.className += ' '+openClass;
	}

	/**
	 * Auto initialization
	 */
	onDomReady(function() {
		var es = document.querySelectorAll('.' + prefix);
		for (var i = 0; i < es.length; i++)
			window.socialLikes(es[i]);
	});
})();