/* global wpcom_reblog */

var jetpackLikesWidgetBatch = [];
var jetpackLikesMasterReady = false;

// Due to performance problems on pages with a large number of widget iframes that need to be loaded,
// we are limiting the processing at any instant to unloaded widgets that are currently in viewport,
// plus this constant that will allow processing of widgets above and bellow the current fold.
// This aim of it is to improve the UX and hide the transition from unloaded to loaded state from users.
var jetpackLikesLookAhead = 2000; // pixels

// Keeps track of loaded comment likes widget so we can unload them when they are scrolled out of view.
var jetpackCommentLikesLoadedWidgets = [];

var jetpackLikesDocReadyPromise = new Promise( resolve => {
	if ( document.readyState !== 'loading' ) {
		resolve();
	} else {
		window.addEventListener( 'DOMContentLoaded', () => resolve() );
	}
} );

function JetpackLikesPostMessage( message, target ) {
	if ( typeof message === 'string' ) {
		try {
			message = JSON.parse( message );
		} catch ( e ) {
			return;
		}
	}

	if ( target && typeof target.postMessage === 'function' ) {
		try {
			target.postMessage(
				JSON.stringify( {
					type: 'likesMessage',
					data: message,
				} ),
				'*'
			);
		} catch ( e ) {
			return;
		}
	}
}

function JetpackLikesBatchHandler() {
	const requests = [];
	document.querySelectorAll( 'div.jetpack-likes-widget-unloaded' ).forEach( widget => {
		if ( jetpackLikesWidgetBatch.indexOf( widget.id ) > -1 ) {
			return;
		}

		if ( ! jetpackIsScrolledIntoView( widget ) ) {
			return;
		}

		jetpackLikesWidgetBatch.push( widget.id );

		var regex = /like-(post|comment)-wrapper-(\d+)-(\d+)-(\w+)/,
			match = regex.exec( widget.id ),
			info;

		if ( ! match || match.length !== 5 ) {
			return;
		}

		info = {
			blog_id: match[ 2 ],
			width: widget.width,
		};

		if ( 'post' === match[ 1 ] ) {
			info.post_id = match[ 3 ];
		} else if ( 'comment' === match[ 1 ] ) {
			info.comment_id = match[ 3 ];
		}

		info.obj_id = match[ 4 ];

		requests.push( info );
	} );

	if ( requests.length > 0 ) {
		JetpackLikesPostMessage(
			{ event: 'initialBatch', requests: requests },
			window.frames[ 'likes-master' ]
		);
	}
}

function JetpackLikesMessageListener( event ) {
	let message = event && event.data;
	if ( typeof message === 'string' ) {
		try {
			message = JSON.parse( message );
		} catch ( err ) {
			return;
		}
	}

	const type = message && message.type;
	const data = message && message.data;

	if ( type !== 'likesMessage' || typeof data.event === 'undefined' ) {
		return;
	}

	// We only allow messages from one origin
	const allowedOrigin = 'https://widgets.wp.com';
	if ( allowedOrigin !== event.origin ) {
		return;
	}

	switch ( data.event ) {
		case 'masterReady':
			jetpackLikesDocReadyPromise.then( () => {
				jetpackLikesMasterReady = true;

				const stylesData = {
					event: 'injectStyles',
				};
				const sdTextColor = document.querySelector( '.sd-text-color' );
				const sdLinkColor = document.querySelector( '.sd-link-color' );
				const sdTextColorStyles = ( sdTextColor && getComputedStyle( sdTextColor ) ) || {};
				const sdLinkColorStyles = ( sdLinkColor && getComputedStyle( sdLinkColor ) ) || {};

				// enable reblogs if they are enabled for the page
				if ( document.body.classList.contains( 'jetpack-reblog-enabled' ) ) {
					JetpackLikesPostMessage( { event: 'reblogsEnabled' }, window.frames[ 'likes-master' ] );
				}

				stylesData.textStyles = {
					color: sdTextColorStyles[ 'color' ],
					fontFamily: sdTextColorStyles[ 'font-family' ],
					fontSize: sdTextColorStyles[ 'font-size' ],
					direction: sdTextColorStyles[ 'direction' ],
					fontWeight: sdTextColorStyles[ 'font-weight' ],
					fontStyle: sdTextColorStyles[ 'font-style' ],
					textDecoration: sdTextColorStyles[ 'text-decoration' ],
				};

				stylesData.linkStyles = {
					color: sdLinkColorStyles[ 'color' ],
					fontFamily: sdLinkColorStyles[ 'font-family' ],
					fontSize: sdLinkColorStyles[ 'font-size' ],
					textDecoration: sdLinkColorStyles[ 'text-decoration' ],
					fontWeight: sdLinkColorStyles[ 'font-weight' ],
					fontStyle: sdLinkColorStyles[ 'font-style' ],
				};

				JetpackLikesPostMessage( stylesData, window.frames[ 'likes-master' ] );

				JetpackLikesBatchHandler();
			} );

			break;

		// We're keeping this for planned future follow ups.
		// @see: https://github.com/Automattic/jetpack/pull/42361#discussion_r1995338815
		case 'showLikeWidget':
			break;

		// We're keeping this for planned future follow ups.
		// @see: https://github.com/Automattic/jetpack/pull/42361#discussion_r1995338815
		case 'showCommentLikeWidget':
			break;

		case 'killCommentLikes':
			// If kill switch for comment likes is enabled remove all widgets wrappers and `Loading...` placeholders.
			document
				.querySelectorAll( '.jetpack-comment-likes-widget-wrapper' )
				.forEach( wrapper => wrapper.remove() );
			break;

		case 'clickReblogFlair':
			if ( wpcom_reblog && typeof wpcom_reblog.toggle_reblog_box_flair === 'function' ) {
				wpcom_reblog.toggle_reblog_box_flair( data.obj_id, data.post_id );
			}
			break;

		case 'hideOtherGravatars': {
			hideLikersPopover();
			break;
		}

		case 'showOtherGravatars': {
			const container = document.querySelector( '#likes-other-gravatars' );

			if ( ! container ) {
				break;
			}

			const list = container.querySelector( 'ul' );

			container.style.display = 'none';
			list.innerHTML = '';

			container
				.querySelectorAll( '.likes-text span' )
				.forEach( item => ( item.textContent = data.totalLikesLabel ) );

			( data.likers || [] ).forEach( async ( liker, index ) => {
				if ( liker.profile_URL.substr( 0, 4 ) !== 'http' ) {
					// We only display gravatars with http or https schema
					return;
				}

				const element = document.createElement( 'li' );
				list.append( element );

				element.innerHTML = `
				<a href="${ encodeURI( liker.profile_URL ) }" rel="nofollow" target="_parent" class="wpl-liker">
					<img src="${ encodeURI( liker.avatar_URL ) }"
						alt=""
						style="width: 28px; height: 28px;" />
					<span></span>
				</a>
				`;


				// Add some extra attributes through native methods, to ensure strings are sanitized.
				element.classList.add( liker.css_class );
				element.querySelector( 'img' ).alt = data.avatarAltTitle.replace( '%s', liker.name );
				element.querySelector( 'span' ).innerText = liker.name;

				if ( index === data.likers.length - 1 ) {
					element.addEventListener( 'keydown', ( e ) => {
						if ( e.key === 'Tab' && ! e.shiftKey ) {
							e.preventDefault();
							hideLikersPopover();

							JetpackLikesPostMessage(
								{ event: 'focusLikesCount', parent: data.parent },
								window.frames[ 'likes-master' ]
							);
						}
					} );
				}
			} );

			const positionPopup = function() {
				const containerStyle = getComputedStyle(container);
				const isRtl = containerStyle.direction === 'rtl';

				const el = document.querySelector( `*[name='${ data.parent }']` );
				const rect = el.getBoundingClientRect();
				const win = el.ownerDocument.defaultView;

				const offset = {
					top: rect.top + win.pageYOffset,
					left: rect.left + win.pageXOffset,
				};

				// don't display yet or we get skewed window.innerWidth later
				container.style.display = 'none';

				let containerLeft = 0;
				container.style.top = offset.top + data.position.top - 1 + 'px';

				if ( isRtl ) {
					const visibleAvatarsCount = data && data.likers ? Math.min( data.likers.length, 5 ) : 0;
					// 24px is the width of the avatar + 4px is the padding between avatars
					containerLeft = offset.left + data.position.left + 24 * visibleAvatarsCount + 4;
					container.style.transform = 'translateX(-100%)';
				} else {
					containerLeft = offset.left + data.position.left;
				}
				container.style.left = containerLeft + 'px';

				// Container width - padding
				const initContainerWidth = data.width - 20;
				const rowLength = Math.floor( initContainerWidth / 37 );
				// # of rows + (avatar + avatar padding) + text above + container padding
				let height = Math.ceil( data.likers.length / rowLength ) * 37 + 17 + 22;
				if ( height > 204 ) {
					height = 204;
				}

				// If the popup is overflows viewport width, we should show it on the next line
				// Push it offscreen to calculated rendered width
				const windowWidth = win.innerWidth;
				container.style.left = '-9999px';
				container.style.display = 'block';

				// If the popup exceeds the viewport width,
				// flip the position of the popup.
				const containerWidth = container.offsetWidth;
				const containerRight = containerLeft + containerWidth;

				if ( containerRight > windowWidth && ! isRtl) {
					containerLeft = rect.left + rect.width - containerWidth;
				} else if ( containerLeft - containerWidth < 0 && isRtl ) {
					container.style.transform = 'none';
					containerLeft = rect.left;
				}
				// Set the container left
				container.style.left = containerLeft + 'px';

				container.setAttribute( 'aria-hidden', 'false' );
			}

			positionPopup();
			container.focus();

			const debounce = function( func, wait ) {
				var timeout;
				return function() {
					var context = this;
					var args = arguments;
					clearTimeout( timeout );
					timeout = setTimeout( function() {
						func.apply( context, args );
					}, wait );
				};
			};

			const debouncedPositionPopup = debounce( positionPopup, 100 );

			// Keep a reference of this function in the element itself
			// so that we can destroy it later
			container.__resizeHandler = debouncedPositionPopup;

			// When window is resized, resize the popup.
			window.addEventListener( "resize", debouncedPositionPopup );
		}
	}
}

window.addEventListener( 'message', JetpackLikesMessageListener );

function hideLikersPopover() {
	const container = document.querySelector( '#likes-other-gravatars' );

	if ( container ) {
		container.style.display = 'none';
		container.setAttribute( 'aria-hidden', 'true' );

		// Remove the resize event listener and cleanup.
		const resizeHandler = container.__resizeHandler;
		if ( resizeHandler ) {
			window.removeEventListener( "resize", resizeHandler );
			delete container.__resizeHandler;
		}
	}
}

document.addEventListener( 'click', hideLikersPopover );

function JetpackLikesWidgetQueueHandler() {
	var wrapperID;

	if ( ! jetpackLikesMasterReady ) {
		setTimeout( JetpackLikesWidgetQueueHandler, 500 );
		return;
	}

	// Restore widgets to initial unloaded state when they are scrolled out of view.
	jetpackUnloadScrolledOutWidgets();

	var unloadedWidgetsInView = jetpackGetUnloadedWidgetsInView();

	if ( unloadedWidgetsInView.length > 0 ) {
		// Grab any unloaded widgets for a batch request
		JetpackLikesBatchHandler();
	}

	for ( var i = 0, length = unloadedWidgetsInView.length; i <= length - 1; i++ ) {
		wrapperID = unloadedWidgetsInView[ i ].id;

		if ( ! wrapperID ) {
			continue;
		}

		jetpackLoadLikeWidgetIframe( wrapperID );
	}
}

function jetpackLoadLikeWidgetIframe( wrapperID ) {
	if ( typeof wrapperID === 'undefined' ) {
		return;
	}

	const wrapper = document.querySelector( '#' + wrapperID );
	wrapper.querySelectorAll( 'iframe' ).forEach( iFrame => iFrame.remove() );

	const placeholder = wrapper.querySelector( '.likes-widget-placeholder' );

	// Post like iframe
	if ( placeholder && placeholder.classList.contains( 'post-likes-widget-placeholder' ) ) {
		const postLikesFrame = document.createElement( 'iframe' );

		postLikesFrame.classList.add( 'post-likes-widget', 'jetpack-likes-widget' );
		postLikesFrame.name = wrapper.dataset.name;
		postLikesFrame.src = wrapper.dataset.src;
		postLikesFrame.height = '55px';
		postLikesFrame.width = '100%';
		postLikesFrame.frameBorder = '0';
		postLikesFrame.scrolling = 'no';
		postLikesFrame.title = wrapper.dataset.title;

		placeholder.after( postLikesFrame );
	}

	// Comment like iframe
	if ( placeholder.classList.contains( 'comment-likes-widget-placeholder' ) ) {
		const commentLikesFrame = document.createElement( 'iframe' );

		commentLikesFrame.class = 'comment-likes-widget-frame jetpack-likes-widget-frame';
		commentLikesFrame.name = wrapper.dataset.name;
		commentLikesFrame.src = wrapper.dataset.src;
		commentLikesFrame.height = '18px';
		commentLikesFrame.width = '100%';
		commentLikesFrame.frameBorder = '0';
		commentLikesFrame.scrolling = 'no';

		wrapper.querySelector( '.comment-like-feedback' ).after( commentLikesFrame );

		jetpackCommentLikesLoadedWidgets.push( commentLikesFrame );
	}

	wrapper.classList.remove( 'jetpack-likes-widget-unloaded' );
	wrapper.classList.add( 'jetpack-likes-widget-loading' );

	wrapper.querySelector( 'iframe' ).addEventListener( 'load', e => {
		JetpackLikesPostMessage(
			{ event: 'loadLikeWidget', name: e.target.name, width: e.target.width },
			window.frames[ 'likes-master' ]
		);

		wrapper.classList.remove( 'jetpack-likes-widget-loading' );
		wrapper.classList.add( 'jetpack-likes-widget-loaded' );
	} );
}

function jetpackGetUnloadedWidgetsInView() {
	const unloadedWidgets = document.querySelectorAll( 'div.jetpack-likes-widget-unloaded' );

	return [ ...unloadedWidgets ].filter( item => jetpackIsScrolledIntoView( item ) );
}

function jetpackIsScrolledIntoView( element ) {
	const top = element.getBoundingClientRect().top;
	const bottom = element.getBoundingClientRect().bottom;

	// Allow some slack above and bellow the fold with jetpackLikesLookAhead,
	// with the aim of hiding the transition from unloaded to loaded widget from users.
	return top + jetpackLikesLookAhead >= 0 && bottom <= window.innerHeight + jetpackLikesLookAhead;
}

function jetpackUnloadScrolledOutWidgets() {
	for ( let i = jetpackCommentLikesLoadedWidgets.length - 1; i >= 0; i-- ) {
		const currentWidgetIframe = jetpackCommentLikesLoadedWidgets[ i ];

		if ( ! jetpackIsScrolledIntoView( currentWidgetIframe ) ) {
			const widgetWrapper =
				currentWidgetIframe &&
				currentWidgetIframe.parentElement &&
				currentWidgetIframe.parentElement.parentElement;

			// Restore parent class to 'unloaded' so this widget can be picked up by queue manager again if needed.
			widgetWrapper.classList.remove( 'jetpack-likes-widget-loaded' );
			widgetWrapper.classList.remove( 'jetpack-likes-widget-loading' );
			widgetWrapper.classList.add( 'jetpack-likes-widget-unloaded' );

			// Bring back the loading placeholder into view.
			widgetWrapper
				.querySelectorAll( '.comment-likes-widget-placeholder' )
				.forEach( item => ( item.style.display = 'block' ) );

			// Remove it from the list of loaded widgets.
			jetpackCommentLikesLoadedWidgets.splice( i, 1 );

			// Remove comment like widget iFrame.
			currentWidgetIframe.remove();
		}
	}
}

var jetpackWidgetsDelayedExec = function ( after, fn ) {
	var timer;
	return function () {
		clearTimeout( timer );
		timer = setTimeout( fn, after );
	};
};

var jetpackOnScrollStopped = jetpackWidgetsDelayedExec( 250, JetpackLikesWidgetQueueHandler );

// Load initial batch of widgets, prior to any scrolling events.
JetpackLikesWidgetQueueHandler();

// Add event listener to execute queue handler after scroll.
window.addEventListener( 'scroll', jetpackOnScrollStopped, true );
;
/**
 * Observe how the user enters content into the comment form in order to determine whether it's a bot or not.
 *
 * Note that no actual input is being saved here, only counts and timings between events.
 */

( function() {
	// Passive event listeners are guaranteed to never call e.preventDefault(),
	// but they're not supported in all browsers.  Use this feature detection
	// to determine whether they're available for use.
	var supportsPassive = false;

	try {
		var opts = Object.defineProperty( {}, 'passive', {
			get : function() {
				supportsPassive = true;
			}
		} );

		window.addEventListener( 'testPassive', null, opts );
		window.removeEventListener( 'testPassive', null, opts );
	} catch ( e ) {}

	function init() {
		var input_begin = '';

		var keydowns = {};
		var lastKeyup = null;
		var lastKeydown = null;
		var keypresses = [];

		var modifierKeys = [];
		var correctionKeys = [];

		var lastMouseup = null;
		var lastMousedown = null;
		var mouseclicks = [];

		var mousemoveTimer = null;
		var lastMousemoveX = null;
		var lastMousemoveY = null;
		var mousemoveStart = null;
		var mousemoves = [];

		var touchmoveCountTimer = null;
		var touchmoveCount = 0;

		var lastTouchEnd = null;
		var lastTouchStart = null;
		var touchEvents = [];

		var scrollCountTimer = null;
		var scrollCount = 0;

		var correctionKeyCodes = [ 'Backspace', 'Delete', 'ArrowUp', 'ArrowDown', 'ArrowLeft', 'ArrowRight', 'Home', 'End', 'PageUp', 'PageDown' ];
		var modifierKeyCodes = [ 'Shift', 'CapsLock' ];

		var forms = document.querySelectorAll( 'form[method=post]' );

		for ( var i = 0; i < forms.length; i++ ) {
			var form = forms[i];

			var formAction = form.getAttribute( 'action' );

			// Ignore forms that POST directly to other domains; these could be things like payment forms.
			if ( formAction ) {
				// Check that the form is posting to an external URL, not a path.
				if ( formAction.indexOf( 'http://' ) == 0 || formAction.indexOf( 'https://' ) == 0 ) {
					if ( formAction.indexOf( 'http://' + window.location.hostname + '/' ) != 0 && formAction.indexOf( 'https://' + window.location.hostname + '/' ) != 0 ) {
						continue;
					}
				}
			}

			form.addEventListener( 'submit', function () {
				var ak_bkp = prepare_timestamp_array_for_request( keypresses );
				var ak_bmc = prepare_timestamp_array_for_request( mouseclicks );
				var ak_bte = prepare_timestamp_array_for_request( touchEvents );
				var ak_bmm = prepare_timestamp_array_for_request( mousemoves );

				var input_fields = {
					// When did the user begin entering any input?
					'bib': input_begin,

					// When was the form submitted?
					'bfs': Date.now(),

					// How many keypresses did they make?
					'bkpc': keypresses.length,

					// How quickly did they press a sample of keys, and how long between them?
					'bkp': ak_bkp,

					// How quickly did they click the mouse, and how long between clicks?
					'bmc': ak_bmc,

					// How many mouseclicks did they make?
					'bmcc': mouseclicks.length,

					// When did they press modifier keys (like Shift or Capslock)?
					'bmk': modifierKeys.join( ';' ),

					// When did they correct themselves? e.g., press Backspace, or use the arrow keys to move the cursor back
					'bck': correctionKeys.join( ';' ),

					// How many times did they move the mouse?
					'bmmc': mousemoves.length,

					// How many times did they move around using a touchscreen?
					'btmc': touchmoveCount,

					// How many times did they scroll?
					'bsc': scrollCount,

					// How quickly did they perform touch events, and how long between them?
					'bte': ak_bte,

					// How many touch events were there?
					'btec' : touchEvents.length,

					// How quickly did they move the mouse, and how long between moves?
					'bmm' : ak_bmm
				};

				var akismet_field_prefix = 'ak_';

				if ( this.getElementsByClassName ) {
					// Check to see if we've used an alternate field name prefix. We store this as an attribute of the container around some of the Akismet fields.
					var possible_akismet_containers = this.getElementsByClassName( 'akismet-fields-container' );

					for ( var containerIndex = 0; containerIndex < possible_akismet_containers.length; containerIndex++ ) {
						var container = possible_akismet_containers.item( containerIndex );

						if ( container.getAttribute( 'data-prefix' ) ) {
							akismet_field_prefix = container.getAttribute( 'data-prefix' );
							break;
						}
					}
				}

				for ( var field_name in input_fields ) {
					var field = document.createElement( 'input' );
					field.setAttribute( 'type', 'hidden' );
					field.setAttribute( 'name', akismet_field_prefix + field_name );
					field.setAttribute( 'value', input_fields[ field_name ] );
					this.appendChild( field );
				}
			}, supportsPassive ? { passive: true } : false  );

			form.addEventListener( 'keydown', function ( e ) {
				// If you hold a key down, some browsers send multiple keydown events in a row.
				// Ignore any keydown events for a key that hasn't come back up yet.
				if ( e.key in keydowns ) {
					return;
				}

				var keydownTime = ( new Date() ).getTime();
				keydowns[ e.key ] = [ keydownTime ];

				if ( ! input_begin ) {
					input_begin = keydownTime;
				}

				// In some situations, we don't want to record an interval since the last keypress -- for example,
				// on the first keypress, or on a keypress after focus has changed to another element. Normally,
				// we want to record the time between the last keyup and this keydown. But if they press a
				// key while already pressing a key, we want to record the time between the two keydowns.

				var lastKeyEvent = Math.max( lastKeydown, lastKeyup );

				if ( lastKeyEvent ) {
					keydowns[ e.key ].push( keydownTime - lastKeyEvent );
				}

				lastKeydown = keydownTime;
			}, supportsPassive ? { passive: true } : false  );

			form.addEventListener( 'keyup', function ( e ) {
				if ( ! ( e.key in keydowns ) ) {
					// This key was pressed before this script was loaded, or a mouseclick happened during the keypress, or...
					return;
				}

				var keyupTime = ( new Date() ).getTime();

				if ( 'TEXTAREA' === e.target.nodeName || 'INPUT' === e.target.nodeName ) {
					if ( -1 !== modifierKeyCodes.indexOf( e.key ) ) {
						modifierKeys.push( keypresses.length - 1 );
					} else if ( -1 !== correctionKeyCodes.indexOf( e.key ) ) {
						correctionKeys.push( keypresses.length - 1 );
					} else {
						// ^ Don't record timings for keys like Shift or backspace, since they
						// typically get held down for longer than regular typing.

						var keydownTime = keydowns[ e.key ][0];

						var keypress = [];

						// Keypress duration.
						keypress.push( keyupTime - keydownTime );

						// Amount of time between this keypress and the previous keypress.
						if ( keydowns[ e.key ].length > 1 ) {
							keypress.push( keydowns[ e.key ][1] );
						}

						keypresses.push( keypress );
					}
				}

				delete keydowns[ e.key ];

				lastKeyup = keyupTime;
			}, supportsPassive ? { passive: true } : false  );

			form.addEventListener( "focusin", function ( e ) {
				lastKeydown = null;
				lastKeyup = null;
				keydowns = {};
			}, supportsPassive ? { passive: true } : false  );

			form.addEventListener( "focusout", function ( e ) {
				lastKeydown = null;
				lastKeyup = null;
				keydowns = {};
			}, supportsPassive ? { passive: true } : false  );
		}

		document.addEventListener( 'mousedown', function ( e ) {
			lastMousedown = ( new Date() ).getTime();
		}, supportsPassive ? { passive: true } : false  );

		document.addEventListener( 'mouseup', function ( e ) {
			if ( ! lastMousedown ) {
				// If the mousedown happened before this script was loaded, but the mouseup happened after...
				return;
			}

			var now = ( new Date() ).getTime();

			var mouseclick = [];
			mouseclick.push( now - lastMousedown );

			if ( lastMouseup ) {
				mouseclick.push( lastMousedown - lastMouseup );
			}

			mouseclicks.push( mouseclick );

			lastMouseup = now;

			// If the mouse has been clicked, don't record this time as an interval between keypresses.
			lastKeydown = null;
			lastKeyup = null;
			keydowns = {};
		}, supportsPassive ? { passive: true } : false  );

		document.addEventListener( 'mousemove', function ( e ) {
			if ( mousemoveTimer ) {
				clearTimeout( mousemoveTimer );
				mousemoveTimer = null;
			}
			else {
				mousemoveStart = ( new Date() ).getTime();
				lastMousemoveX = e.offsetX;
				lastMousemoveY = e.offsetY;
			}

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					)
				);

				if ( mousemove[1] > 0 ) {
					// If there was no measurable distance, then it wasn't really a move.
					mousemoves.push( mousemove );
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				mousemoveStart = null;
				mousemoveTimer = null;
			}, 500, e, mousemoveStart );
		}, supportsPassive ? { passive: true } : false  );

		document.addEventListener( 'touchmove', function ( e ) {
			if ( touchmoveCountTimer ) {
				clearTimeout( touchmoveCountTimer );
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			touchmoveCountTimer = setTimeout( function () {
				touchmoveCount++;
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		}, supportsPassive ? { passive: true } : false );

		document.addEventListener( 'touchstart', function ( e ) {
			lastTouchStart = ( new Date() ).getTime();
		}, supportsPassive ? { passive: true } : false );

		document.addEventListener( 'touchend', function ( e ) {
			if ( ! lastTouchStart ) {
				// If the touchstart happened before this script was loaded, but the touchend happened after...
				return;
			}

			var now = ( new Date() ).getTime();

			var touchEvent = [];
			touchEvent.push( now - lastTouchStart );

			if ( lastTouchEnd ) {
				touchEvent.push( lastTouchStart - lastTouchEnd );
			}

			touchEvents.push( touchEvent );

			lastTouchEnd = now;

			// Don't record this time as an interval between keypresses.
			lastKeydown = null;
			lastKeyup = null;
			keydowns = {};
		}, supportsPassive ? { passive: true } : false );

		document.addEventListener( 'scroll', function ( e ) {
			if ( scrollCountTimer ) {
				clearTimeout( scrollCountTimer );
			}

			scrollCountTimer = setTimeout( function () {
				scrollCount++;
			}, 500 );
		}, supportsPassive ? { passive: true } : false );
	}

	/**
	 * For the timestamp data that is collected, don't send more than `limit` data points in the request.
	 * Choose a random slice and send those.
	 */
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		if ( ! limit ) {
			limit = 100;
		}

		var rv = '';

		if ( a.length > 0 ) {
			var random_starting_point = Math.max( 0, Math.floor( Math.random() * a.length - limit ) );

			for ( var i = 0; i < limit && i < a.length; i++ ) {
				rv += a[ random_starting_point + i ][0];

				if ( a[ random_starting_point + i ].length >= 2 ) {
					rv += "," + a[ random_starting_point + i ][1];
				}

				rv += ";";
			}
		}

		return rv;
	}

	if ( document.readyState !== 'loading' ) {
		init();
	} else {
		document.addEventListener( 'DOMContentLoaded', init );
	}
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