/**
 * Comment Likes - JavaScript
 *
 * This handles liking and unliking comments, as well as viewing who has
 * liked a particular comment.
 *
 * @dependency  Swipe (dynamically loaded when needed)
 *
 * @package     Comment_Likes
 * @subpackage  JavaScript
 */
(function () {
	function init() {
		let extWin;
		let extWinCheck;
		let commentLikeEvent;

		// Only run once.
		if (window.comment_likes_loaded) {
			return;
		}
		window.comment_likes_loaded = true;

		// Client-side cache of who liked a particular comment to avoid
		// having to hit the server multiple times for the same data.
		const commentLikeCache = {};

		let swipeLibPromise;

		// Load the Swipe library, if it's not already loaded.
		function swipeLibLoader() {
			if (!swipeLibPromise) {
				swipeLibPromise = new Promise((resolve, reject) => {
					if (window.Swipe) {
						resolve(window.Swipe);
					} else {
						const swipeScript = document.createElement('script');
						swipeScript.src = comment_like_text.swipeUrl;
						swipeScript.async = true;
						document.body.appendChild(swipeScript);
						swipeScript.addEventListener('load', () => resolve(window.Swipe));
						swipeScript.addEventListener('error', error => reject(error));
					}
				});
			}
			return swipeLibPromise;
		}

		/**
		 * Parse the comment ID from a comment like link.
		 */
		function getCommentId(link) {
			const commentId =
				link && link.getAttribute('href') && link.getAttribute('href').split('like_comment=');
			return commentId[1].split('&_wpnonce=')[0];
		}

		/**
		 * Handle an ajax action on the comment like link.
		 */
		function handleLinkAction(link, action, commentId, callback) {
			const nonce =
				link && link.getAttribute('href') && link.getAttribute('href').split('_wpnonce=')[1];

			fetch('/wp-admin/admin-ajax.php', {
				method: 'POST',
				body: new URLSearchParams({
					action: action,
					_wpnonce: nonce,
					like_comment: commentId,
					blog_id: Number(link.dataset.blog),
				}),
				headers: {
					'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8',
					'X-Requested-With': 'XMLHttpRequest',
					Accept: 'application/json',
					'cache-control': 'no-cache',
					pragma: 'no-cache',
				},
			})
				.then(response => response.json())
				.then(callback);
		}

		function startPolling() {
			// Append cookie polling login iframe to this window to wait for user to finish logging in (or cancel)
			const loginIframe = document.createElement('iframe');
			loginIframe.id = 'wp-login-polling-iframe';
			loginIframe.src = 'https://wordpress.com/public.api/connect/?iframe=true';
			document.body.appendChild(loginIframe);
			loginIframe.style.display = 'none';
		}

		function stopPolling() {
			const iframe = document.querySelector('#wp-login-polling-iframe');
			if (iframe) {
				iframe.remove();
			}
		}

		function hide(el) {
			if (el && el.style) {
				el.style.display = 'none';
			}
		}

		function show(el) {
			if (el && el.style) {
				el.style.removeProperty('display');
			}
		}

		// Overlay used for displaying comment like info.
		class Overlay {
			constructor() {
				// Overlay element.
				this.el = document.createElement('div');
				this.el.classList.add('comment-likes-overlay');
				document.body.appendChild(this.el);
				hide(this.el);

				this.el.addEventListener('mouseenter', () => {
					// Don't hide the overlay if the user is mousing over it.
					overlay.cancelHide();
				});

				this.el.addEventListener('mouseleave', () => overlay.requestHide());

				// Inner contents of overlay.
				this.innerEl = null;

				// Instance of the Swipe library.
				this.swipe = null;

				// Timeout used for hiding the overlay.
				this.hideTimeout = null;
			}

			// Initialise the overlay for use, removing any old content.
			clear() {
				// Unload any previous instance of Swipe (to avoid leaking a global
				// event handler). This is done before clearing the contents of the
				// overlay because Swipe expects the slides to still be present.
				if (this.swipe) {
					this.swipe.kill();
					this.swipe = null;
				}
				this.el.innerHTML = '';
				this.innerEl = document.createElement('div');
				this.innerEl.classList.add('inner');
				this.el.appendChild(this.innerEl);
			}

			/**
			 * Construct a list (<ul>) of user (gravatar, name) details.
			 *
			 * @param  data     liker data returned from the server
			 * @param  klass    CSS class to apply to the <ul> element
			 * @param  start    index of user to start at
			 * @param  length   number of users to include in the list
			 *
			 * @return          A container element with the list
			 */
			getUserBits(data, klass, start, length) {
				start = start || 0;
				let last = start + (length || data.length);
				last = last > data.length ? data.length : last;
				const container = document.createElement('div');
				container.classList.add('liker-list');
				let html = `<ul class="${klass || ''}">`;
				for (let i = start; i < last; ++i) {
					const user = data[i];
					html += `
						<li>
							<a rel="nofollow" title="${user.display_name_esc}" href="${user.profile_url_esc}">
								<img src="${user.avatar_url_esc}" alt="${user.display_name_esc}" />
								<span class="user-name">${user.display_name_esc}</span>
							</a>
						</li>
					`;
				}
				html += '</ul>';
				container.innerHTML = html;
				return container;
			}

			/**
			 * Render the display of who has liked this comment. The type of
			 * display depends on how many people have liked the comment.
			 * If more than 10 people have liked the comment, this function
			 * renders navigation controls and sets up the Swipe library for
			 * changing between pages.
			 *
			 * @param link  the element over which the user is hovering
			 * @param data  the results retrieved from the server
			 */
			showLikes(link, data) {
				this.clear();

				link.dataset.likeCount = data.length;
				if (data.length === 0) {
					// No likers after all.
					hide(this.el);
					return;
				}

				this.innerEl.style.padding = '12px';

				if (data.length < 6) {
					// Only one column needed.
					this.innerEl.style.maxWidth = '200px';
					this.innerEl.innerHTML = '';
					this.innerEl.appendChild(this.getUserBits(data, 'single'));
					this.setPosition(link);
				} else if (data.length < 11) {
					// Two columns, but only one page.
					this.innerEl.innerHTML = '';
					this.innerEl.appendChild(this.getUserBits(data, 'double'));
					this.setPosition(link);
				} else {
					// Multiple pages.
					this.renderLikesWithPagination(data, link);
				}
			}

			/**
			 * Render multiple pages of likes with pagination controls.
			 * This function is intended to be called by `showLikes` above.
			 *
			 * @param data  the results retrieved from the server
			 */
			renderLikesWithPagination(data, link) {
				swipeLibLoader().then(() => {
					const page_count = Math.ceil(data.length / 10);
					// Swipe requires two nested containers.
					const swipe = document.createElement('div');
					swipe.classList.add('swipe');
					this.innerEl.appendChild(swipe);

					const wrap = document.createElement('div');
					wrap.classList.add('swipe-wrap');
					swipe.appendChild(wrap);

					for (let i = 0; i < page_count; ++i) {
						wrap.appendChild(this.getUserBits(data, 'double', i * 10, 10));
					}

					/**
					 * Navigation controls.
					 * This is based on the Newdash controls found in
					 *    reader/recommendations-templates.php
					 */
					const nav = document.createElement('nav');
					nav.classList.add('slider-nav');

					let navContents = `
						<a href="#" class="prev">
							<span class="noticon noticon-previous" title="Previous" alt="<"></span>
						</a>
						<span class="position">
					`;
					for (let i = 0; i < page_count; ++i) {
						navContents += `<em data-page="${i}" class="${i === 0 ? 'on' : ''}">&bull;</em>`;
					}
					navContents += `
						</span>
						<a href="#" class="next">
							<span class="noticon noticon-next" title="Next" alt=">"></span>
						</a>
					`;
					this.innerEl.appendChild(nav);
					nav.innerHTML = navContents;

					/** Set up Swipe. **/
					// Swipe cannot be set up successfully unless its container
					// is visible, so we show it now.
					show(this.el);
					this.setPosition(link);

					this.swipe = new Swipe(swipe, {
						callback: function (pos) {
							// Update the pagination indicators.
							//
							// If there are exactly two pages, Swipe has a weird
							// special case where it duplicates both pages and
							// can return index 2 and 3 even though those aren't
							// real pages (see swipe.js, line 47). To deal with
							// this, we use the expression `pos % page_count`.
							pos = pos % page_count;
							nav.querySelectorAll('em').forEach(em => {
								const page = Number(em.dataset.page);
								em.setAttribute('class', pos === page ? 'on' : '');
							});
						},
					});

					nav.querySelectorAll('em').forEach(em => {
						em.addEventListener('click', e => {
							// Go to the page corresponding to the indicator clicked.
							this.swipe.slide(Number(em.dataset.page));
							e.preventDefault();
						});
					});
					// Previous and next buttons.
					nav.querySelector('.prev').addEventListener('click', e => {
						this.swipe.prev();
						e.preventDefault();
					});
					nav.querySelector('.next').addEventListener('click', e => {
						this.swipe.next();
						e.preventDefault();
					});
				});
			}

			/**
			 * Open the overlay and show a loading message.
			 */
			showLoadingMessage(link) {
				this.clear();
				this.innerEl.textContent = comment_like_text.loading;
				this.setPosition(link);
			}

			/**
			 * Position the overlay near the current comment.
			 *
			 * @param link  element near which to position the overlay
			 */
			setPosition(link) {
				// Prepare a down arrow icon for the bottom of the overlay.
				const icon = document.createElement('span');
				this.el.appendChild(icon);
				icon.classList.add('icon', 'noticon', 'noticon-downarrow');
				icon.style.textShadow = '0px 1px 1px rgb(223, 223, 223)';

				const rect = link.getBoundingClientRect();
				const win = document.defaultView;
				const offset = {
					top: rect.top + win.scrollY,
					left: rect.left + win.scrollX,
				};

				// Take measurements with the element fully visible.
				show(this.el);
				let left = offset.left - (this.el.offsetWidth - link.offsetWidth) / 2;
				left = left < 5 ? 5 : left;
				let top = offset.top - this.el.offsetHeight + 5;
				hide(this.el);

				const adminBar = document.querySelector('#wpadminbar');

				// Check if the overlay would appear off the screen.
				if (top < win.scrollY + ((adminBar && adminBar.offsetHeight) || 0)) {
					// We'll display the overlay beneath the link instead.
					top = offset.top + link.offsetHeight;
					// Instead of using the down arrow icon, use an up arrow.
					icon.remove();
					this.el.prepend(icon);
					icon.classList.remove('noticon-downarrow');
					icon.classList.add('noticon-uparrow');
					icon.style.textShadow = '0px -1px 1px rgb(223, 223, 223)';
					icon.style.verticalAlign = 'bottom';
				}

				this.el.style.left = `${left}px`;
				this.el.style.top = `${top}px`;
				show(this.el);

				// The height of the arrow icon differs slightly between browsers,
				// so we compute the margin here to make sure it isn't disjointed
				// from the overlay.
				icon.style.marginTop = `${icon.scrollHeight - 26}px`;
				icon.style.marginBottom = `${20 - icon.scrollHeight}px`;

				// Position the arrow to be horizontally centred on the link.
				icon.style.paddingLeft = `${
					offset.left - left + (link.offsetWidth - icon.scrollWidth) / 2
				}px`;
			}

			/**
			 * Return whether the overlay is visible.
			 */
			isVisible() {
				return this.el.style.getPropertyValue('display') !== 'none';
			}

			/**
			 * Request that the overlay be hidden after a short delay.
			 */
			requestHide() {
				if (this.hideTimeout !== null) {
					return;
				}
				this.hideTimeout = setTimeout(() => {
					hide(this.el);
					this.clear();
				}, 300);
			}

			/**
			 * Cancel a request to hide the overlay.
			 */
			cancelHide() {
				if (this.hideTimeout !== null) {
					clearTimeout(this.hideTimeout);
					this.hideTimeout = null;
				}
			}
		}

		// Overlay used for displaying comment like info.
		const overlay = new Overlay();

		// The most recent comment for which the user has requested to see
		// who liked it.
		var relevantComment;

		// Precache after this timeout.
		var precacheTimeout = null;

		/**
		 * Fetch the like data for a particular comment.
		 */
		function fetchLikeData(link, commentId) {
			commentLikeCache[commentId] = null;

			const container = link && link.parentElement && link.parentElement.parentElement;
			const star = container.querySelector('a.comment-like-link');
			star &&
				handleLinkAction(star, 'view_comment_likes', commentId, data => {
					// Populate the cache.
					commentLikeCache[commentId] = data;

					// Only show the overlay if the user is interested.
					if (overlay.isVisible() && relevantComment === commentId) {
						overlay.showLikes(link, data);
					}
				});
		}

		function readCookie(c) {
			const nameEQ = c + '=';
			const cookieStrings = document.cookie.split(';');

			for (let i = 0; i < cookieStrings.length; i++) {
				let cookieString = cookieStrings[i];
				while (cookieString.charAt(0) === ' ') {
					cookieString = cookieString.substring(1, cookieString.length);
				}
				if (cookieString.indexOf(nameEQ) === 0) {
					const chunk = cookieString.substring(nameEQ.length, cookieString.length);
					const pairs = chunk.split('&');
					const cookieData = {};
					for (let num = pairs.length - 1; num >= 0; num--) {
						const pair = pairs[num].split('=');
						cookieData[pair[0]] = decodeURIComponent(pair[1]);
					}
					return cookieData;
				}
			}
			return null;
		}

		function getServiceData() {
			const data = readCookie('wpc_wpc');
			if (data === null || typeof data.access_token === 'undefined' || !data.access_token) {
				return false;
			}
			return data;
		}

		function readMessage(msg) {
			const event = msg.data;

			if (typeof event.event === 'undefined') {
				return;
			}

			if (event.event === 'login' && event.success) {
				extWinCheck = setInterval(function () {
					if (!extWin || extWin.closed) {
						clearInterval(extWinCheck);
						if (getServiceData()) {
							// Load page in an iframe to get the current comment nonce
							const nonceIframe = document.createElement('iframe');
							nonceIframe.id = 'wp-login-comment-nonce-iframe';
							nonceIframe.style.display = 'none';
							nonceIframe.src = commentLikeEvent + '';
							document.body.appendChild(nonceIframe);

							const commentLikeId = (commentLikeEvent + '')
								.split('like_comment=')[1]
								.split('&_wpnonce=')[0];
							let c;

							// Set a 5 second timeout to redirect to the comment page without doing the Like as a fallback
							const commentLikeTimeout = setTimeout(() => {
								window.location = commentLikeEvent;
							}, 5000);

							// Check for a new nonced redirect and use that if available before timing out
							const commentLikeCheck = setInterval(() => {
								const iframe = document.querySelector('#wp-login-comment-nonce-iframe');
								if (iframe) {
									c = iframe.querySelector(`#comment-like-${commentLikeId} .comment-like-link`);
								}
								if (c && typeof c.href !== 'undefined') {
									clearTimeout(commentLikeTimeout);
									clearInterval(commentLikeCheck);
									window.location = c.href;
								}
							}, 100);
						}
					}
				}, 100);

				if (extWin) {
					if (!extWin.closed) {
						extWin.close();
					}
					extWin = false;
				}

				stopPolling();
			}
		}

		if (typeof window.postMessage !== 'undefined') {
			window.addEventListener('message', e => {
				let message = e && e.data;
				if (typeof message === 'string') {
					try {
						message = JSON.parse(message);
					} catch (err) {
						return;
					}
				}

				const type = message && message.type;
				if (type === 'loginMessage') {
					readMessage(message);
				}
			});
		}

		document.body.addEventListener('click', e => {
			let target = e.target;

			// Don't do anything when clicking on the "X people" link.
			if (target.matches('p.comment-likes a.view-likers')) {
				e.preventDefault();
				return;
			}

			// Retrieve the surrounding paragraph to the star, if it hasn't been liked.
			const notLikedPar = target.closest('p.comment-not-liked');

			// Return if not clicking on star or surrounding paragraph.
			if (!target.matches('a.comment-like-link') && !notLikedPar) {
				return;
			}

			// When a comment hasn't been liked, make the text clickable, too.
			if (notLikedPar) {
				target = notLikedPar.querySelector('a.comment-like-link');
				if (!target) {
					return;
				}
			}

			if (target.classList.contains('needs-login')) {
				e.preventDefault();
				commentLikeEvent = target;
				if (extWin) {
					if (!extWin.closed) {
						extWin.close();
					}
					extWin = false;
				}

				stopPolling();

				const url = 'https://wordpress.com/public.api/connect/?action=request&service=wordpress';
				extWin = window.open(
					url,
					'likeconn',
					'status=0,toolbar=0,location=1,menubar=0,directories=0,resizable=1,scrollbars=1,height=560,width=500'
				);

				startPolling();

				return false;
			}

			// Record that the user likes or does not like this comment.
			const commentId = getCommentId(target);
			target.classList.add('loading');

			let commentEl = document.querySelector(`p#comment-like-${commentId}`);
			// Determine whether to like or unlike based on whether the comment is
			// currently liked.
			const action =
				commentEl && commentEl.dataset.liked === 'comment-liked'
					? 'unlike_comment'
					: 'like_comment';
			handleLinkAction(target, action, commentId, data => {
				// Invalidate the like cache for this comment.
				delete commentLikeCache[commentId];

				const countEl = document.querySelector(`#comment-like-count-${data.context}`);
				if (countEl) {
					countEl.innerHTML = data.display;
				}

				commentEl = document.querySelector(`p#comment-like-${data.context}`);
				if (action === 'like_comment') {
					commentEl.classList.remove('comment-not-liked');
					commentEl.classList.add('comment-liked');
					commentEl.dataset.liked = 'comment-liked';
				} else {
					commentEl.classList.remove('comment-liked');
					commentEl.classList.add('comment-not-liked');
					commentEl.dataset.liked = 'comment-not-liked';
				}

				// Prefetch new data for this comment (if there are likers left).
				const parent = target.closest('.comment-likes');
				const link = parent && parent.querySelector('a.view-likers');
				if (link) {
					fetchLikeData(link, commentId);
				}

				target.classList.remove('loading');
			});
			e.preventDefault();
			e.stopPropagation();
		});

		document.body.addEventListener(
			'mouseenter',
			function (e) {
				if (!e.target.matches('p.comment-likes a.view-likers')) {
					return;
				}
				// Show the user a list of who has liked this comment.

				const link = e.target;
				if (Number(link.dataset.likeCount || 0) === 0) {
					// No one has liked this comment.
					return;
				}

				// Don't hide the overlay.
				overlay.cancelHide();

				// Get the comment ID.
				const container = link.parentElement && link.parentElement.parentElement;
				const star = container && container.querySelector('a.comment-like-link');
				const commentId = star && getCommentId(star);
				relevantComment = commentId;

				// Check if the list of likes for this comment is already in
				// the cache.
				if (commentId in commentLikeCache) {
					const entry = commentLikeCache[commentId];
					// Only display the likes if the ajax request is
					// actually done.
					if (entry !== null) {
						overlay.showLikes(link, entry);
					} else {
						// Make sure the overlay is visible (in case
						// the user moved the mouse away while loading
						// but then came back before it finished
						// loading).
						overlay.showLoadingMessage(link);
					}
					return;
				}

				// Position the "Loading..." overlay.
				overlay.showLoadingMessage(link);

				// Fetch the data.
				fetchLikeData(link, commentId);
			},
			true
		);

		document.body.addEventListener(
			'mouseleave',
			e => {
				if (!e.target.matches('p.comment-likes a.view-likers')) {
					return;
				}
				// User has moved cursor away - hide the overlay.
				overlay.requestHide();
			},
			true
		);

		document.body.addEventListener(
			'mouseenter',
			e => {
				if (!e.target.matches('.comment') || !e.target.querySelector('a.comment-like-link')) {
					return;
				}
				// User is moving over a comment - precache the comment like data.
				if (precacheTimeout !== null) {
					clearTimeout(precacheTimeout);
					precacheTimeout = null;
				}

				const star = e.target.querySelector('a.comment-like-link');
				const parent = star.closest('.comment-likes');
				const link = parent && parent.querySelector('a.view-likers');
				if (!link || Number(link.dataset.likeCount || 0) === 0) {
					// No likes.
					return;
				}
				const commentId = getCommentId(star);
				if (commentId in commentLikeCache) {
					// Already in cache.
					return;
				}

				precacheTimeout = setTimeout(() => {
					precacheTimeout = null;
					if (commentId in commentLikeCache) {
						// Was cached in the interim.
						return;
					}
					fetchLikeData(link, commentId);
				}, 1000);
			},
			true
		);
	}

	if (document.readyState !== 'loading') {
		init();
	} else {
		document.addEventListener('DOMContentLoaded', init);
	}
})();
;
/**
 * Handles toggling the navigation menu for small screens.
 */
( function() {
	var nav = document.querySelectorAll( '.wpcom-pages' )[0], button, menu, buttonVisible;
	if ( ! nav ) {
		return;
	}

	button = nav.getElementsByTagName( 'a' )[0];
	menu   = nav.getElementsByTagName( 'ul' )[0];
	if ( ! button ) {
		return;
	}

	// Open menu when Menu button is clicked.
	button.onclick = function( e) {
		if ( -1 !== button.className.indexOf( 'toggled-on' ) ) {
			button.className = button.className.replace( ' toggled-on', '' );
			menu.className = menu.className.replace( ' toggled-on', '' );
		} else {
			button.className += ' toggled-on';
			menu.className += ' toggled-on';
		}
		e.preventDefault();
	};

	// Handle both clicks and touch events.
	document.body.onclick = function( e ) {
		closeMenu( e );
	};
	document.body.ontouchstart = function( e ) {
		closeMenu( e );
	};

	// When menu is open, close it with any click away from the menu.
	var closeMenu = function( e ) {
		if ( button === e.target ) {
			return;
		}

		// Only continue if menu button is visible.
		buttonVisible = window.getComputedStyle( button );
		if ( 'none' === buttonVisible.getPropertyValue( 'display' ) ) {
			return;
		}

		if ( ! menu.contains( e.target ) ) {
			button.className = button.className.replace( ' toggled-on', '' );
			menu.className = menu.className.replace( ' toggled-on', '' );
		}

		// If the click away from the menu was on something for which we should respond
		// to a click, return rather than stopping propagation. Else the click doesn't work.
		// This should run after the toggle code above so that the menu itself does close as expected.
		if ( [ 'button', 'submit', 'a' ].indexOf( e.target.type ) !== -1 ) {
			return;
		}

	}
} )();
;