$( () => {
	// sidebar-chunk only applies to desktop-small, but the toggles are hidden at
	// other resolutions regardless and the css overrides any visible effects.
	const $dropdowns = $( '#personal, #p-variants-desktop, .sidebar-chunk' );

	/**
	 * Desktop menu click-toggling
	 *
	 * We're not even checking if it's desktop because the classes in play have no effect
	 * on mobile regardless... this may break things at some point, though.
	 */

	/**
	 * Close all dropdowns
	 */
	function closeOpen() {
		$dropdowns.removeClass( 'dropdown-active' );
	}

	/**
	 * Click behaviour
	 */
	$dropdowns.on( 'click', function ( e ) {
		// Check if it's already open so we don't open it again
		// eslint-disable-next-line no-jquery/no-class-state
		if ( $( this ).hasClass( 'dropdown-active' ) ) {
			if ( $( e.target ).closest( $( 'h2, #p-variants-desktop h3' ) ).length > 0 ) {
				// treat reclick on the header as a toggle
				closeOpen();
			}
			// Clicked inside an open menu; don't do anything
		} else {
			closeOpen();
			e.stopPropagation(); // stop hiding it!
			$( this ).addClass( 'dropdown-active' );
		}
	} );
	$( document ).on( 'click', ( e ) => {
		if ( $( e.target ).closest( $dropdowns ).length > 0 ) {
			// Clicked inside an open menu; don't close anything
		} else {
			closeOpen();
		}
	} );
} );

mw.hook( 'wikipage.content' ).add( ( $content ) => {
	// Gotta wrap them for this to work; maybe later the parser etc will do this for us?!
	$content.find( 'div > table:not( table table )' ).wrap( '<div class="content-table-wrapper"><div class="content-table"></div></div>' );
	$content.find( '.content-table-wrapper' ).prepend( '<div class="content-table-left"></div><div class="content-table-right"></div>' );

	/**
	 * Set up borders for experimental overflowing table scrolling
	 *
	 * I have no idea what I'm doing.
	 *
	 * @param {jQuery} $table
	 */
	function setScrollClass( $table ) {
		const $tableWrapper = $table.parent(),
			// wtf browser rtl implementations
			scroll = Math.abs( $tableWrapper.scrollLeft() );

		$tableWrapper.parent()
			// 1 instead of 0 because of weird rtl rounding errors or something
			.toggleClass( 'scroll-left', scroll > 1 )
			.toggleClass( 'scroll-right', $table.outerWidth() - $tableWrapper.innerWidth() - scroll > 1 );
	}

	$content.find( '.content-table' ).on( 'scroll', function () {
		setScrollClass( $( this ).children( 'table' ).first() );

		if ( $content.attr( 'dir' ) === 'rtl' ) {
			$( this ).find( 'caption' ).css( 'margin-right', Math.abs( $( this ).scrollLeft() ) + 'px' );
		} else {
			$( this ).find( 'caption' ).css( 'margin-left', $( this ).scrollLeft() + 'px' );
		}
	} );

	/**
	 * Mark overflowed tables for scrolling
	 */
	function unOverflowTables() {
		$content.find( '.content-table > table' ).each( function () {
			const $table = $( this ),
				$wrapper = $table.parent().parent();
			// Use browser's native width to avoid off-by-0.5 errors (T402848)
			if ( $table[ 0 ].offsetWidth > $wrapper[ 0 ].offsetWidth ) {
				$wrapper.addClass( 'overflowed' );
				setScrollClass( $table );
			} else {
				$wrapper.removeClass( 'overflowed scroll-left scroll-right fixed-scrollbar-container' );
			}
		} );

		// Set up sticky captions
		$content.find( '.content-table > table > caption' ).each( function () {
			const $table = $( this ).parent(),
				$wrapper = $table.parent().parent();

			if ( $table.outerWidth() > $wrapper.outerWidth() ) {
				const $container = $( this ).parents( '.content-table-wrapper' );
				$( this ).width( $content.width() );
				const tableHeight = $container.innerHeight() - $( this ).outerHeight();

				$container.find( '.content-table-left' ).height( tableHeight );
				$container.find( '.content-table-right' ).height( tableHeight );
			}
		} );
	}

	unOverflowTables();
	$( window ).on( 'resize', unOverflowTables );

	/**
	 * Sticky scrollbars maybe?!
	 */
	$content.find( '.content-table' ).each( function () {
		const $tableWrapper = $( this );
		const $table = $tableWrapper.children( 'table' ).first();

		// Assemble our silly crap and add to page
		const $scrollbar = $( '<div>' ).addClass( 'content-table-scrollbar inactive' ).width( $content.width() );
		const $spoof = $( '<div>' ).addClass( 'content-table-spoof' ).width( $table.outerWidth() );
		$tableWrapper.parent().prepend( $scrollbar.prepend( $spoof ) );
	} );

	/**
	 * Scoll table when scrolling scrollbar and visa-versa lololol wut
	 */
	$content.find( '.content-table' ).on( 'scroll', function () {
		// Only do this here if we're not already mirroring the spoof
		const $mirror = $( this ).siblings( '.inactive' ).first();

		$mirror.scrollLeft( $( this ).scrollLeft() );
	} );
	$content.find( '.content-table-scrollbar' ).on( 'scroll', function () {
		const $mirror = $( this ).siblings( '.content-table' ).first();

		// Only do this here if we're not already mirroring the table
		// eslint-disable-next-line no-jquery/no-class-state
		if ( !$( this ).hasClass( 'inactive' ) ) {
			$mirror.scrollLeft( $( this ).scrollLeft() );
		}
	} );

	/**
	 * Set active when actually over the table it applies to...
	 */
	function determineActiveSpoofScrollbars() {
		$content.find( '.overflowed .content-table' ).each( function () {
			const $scrollbar = $( this ).siblings( '.content-table-scrollbar' ).first();

			// Skip caption
			let captionHeight = $( this ).find( 'caption' ).outerHeight() || 0;
			if ( captionHeight ) {
				// Pad slightly for reasons
				captionHeight += 8;
			}

			const tableTop = $( this ).offset().top,
				tableBottom = tableTop + $( this ).outerHeight(),
				viewBottom = window.scrollY + document.documentElement.clientHeight,
				active = tableTop + captionHeight < viewBottom && tableBottom > viewBottom;
			$scrollbar.toggleClass( 'inactive', !active );
		} );
	}

	determineActiveSpoofScrollbars();
	$( window ).on( 'scroll resize', determineActiveSpoofScrollbars );

	/**
	 * Make sure tablespoofs remain correctly-sized?
	 */
	$( window ).on( 'resize', () => {
		$content.find( '.content-table-scrollbar' ).each( function () {
			const width = $( this ).siblings().first().find( 'table' ).first().width();
			$( this ).find( '.content-table-spoof' ).first().width( width );
			$( this ).width( $content.width() );
		} );
	} );
} );
