'use strict';

var
	parser = require( 'ext.discussionTools.init' ).parser,
	initialOffset, indentWidth;

function markTimestamp( node, match ) {
	var
		dfParser = parser.getLocalTimestampParser(),
		newNode, wrapper, date;

	newNode = node.splitText( match.index );
	newNode.splitText( match[ 0 ].length );

	wrapper = document.createElement( 'span' );
	wrapper.className = 'detected-timestamp';
	// We might need to actually port all the date formatting code from MediaWiki's PHP code
	// if we want to support displaying dates in all the formats available in user preferences
	// (which include formats in several non-Gregorian calendars).
	date = dfParser( match );
	wrapper.title = date.format() + ' / ' + date.fromNow();
	wrapper.appendChild( newNode );
	node.parentNode.insertBefore( wrapper, node.nextSibling );
}

function markSignature( sigNodes ) {
	var
		where = sigNodes[ 0 ],
		wrapper = document.createElement( 'span' );
	wrapper.className = 'detected-signature';
	where.parentNode.insertBefore( wrapper, where );
	while ( sigNodes.length ) {
		wrapper.appendChild( sigNodes.pop() );
	}
}

function getBoundingRect( comment ) {
	// Convert our plain-object range to a Range object
	var nativeRange = document.createRange();
	nativeRange.setStart( comment.range.startContainer, comment.range.startOffset );
	nativeRange.setEnd( comment.range.endContainer, comment.range.endOffset );
	return nativeRange.getBoundingClientRect();
}

function fixFakeFirstHeadingRect( rect, comment ) {
	// If the page has comments before the first section heading, they are connected to a "fake"
	// heading with an empty range. Visualize the page title as the heading for that section.
	var node;
	if ( rect.x === 0 && rect.y === 0 && comment.type === 'heading' ) {
		node = document.getElementsByClassName( 'firstHeading' )[ 0 ];
		return node.getBoundingClientRect();
	}
	return rect;
}

function calculateSizes() {
	var $content, rect, $test, rtl;

	if ( initialOffset !== undefined ) {
		return;
	}

	// eslint-disable-next-line no-jquery/no-global-selector
	rtl = $( 'html' ).attr( 'dir' ) === 'rtl';
	// eslint-disable-next-line no-jquery/no-global-selector
	$content = $( '#mw-content-text' );
	$test = $( '<dd>' ).appendTo( $( '<dl>' ).appendTo( $content ) );
	rect = $content[ 0 ].getBoundingClientRect();

	initialOffset = rtl ? document.body.scrollWidth - rect.left - rect.width : rect.left;
	indentWidth = parseFloat( $test.css( rtl ? 'margin-right' : 'margin-left' ) ) +
		parseFloat( $test.parent().css( rtl ? 'margin-right' : 'margin-left' ) );

	$test.parent().remove();
}

function markComment( comment ) {
	var
		// eslint-disable-next-line no-jquery/no-global-selector
		rtl = $( 'html' ).attr( 'dir' ) === 'rtl',
		rect = getBoundingRect( comment ),
		marker = document.createElement( 'div' ),
		marker2 = document.createElement( 'div' ),
		scrollTop = document.documentElement.scrollTop || document.body.scrollTop,
		scrollLeft = document.documentElement.scrollLeft || document.body.scrollLeft,
		parentRect, i;

	rect = fixFakeFirstHeadingRect( rect, comment );

	marker.className = 'detected-comment';
	marker.style.top = ( rect.top + scrollTop ) + 'px';
	marker.style.height = ( rect.height ) + 'px';
	marker.style.left = ( rect.left + scrollLeft ) + 'px';
	marker.style.width = ( rect.width ) + 'px';
	document.body.appendChild( marker );

	calculateSizes();

	if ( comment.parent ) {
		parentRect = getBoundingRect( comment.parent );
		parentRect = fixFakeFirstHeadingRect( parentRect, comment.parent );
		if ( comment.parent.level === 0 ) {
			// Twiddle so that it looks nice
			parentRect = $.extend( {}, parentRect );
			parentRect.height -= 10;
		}

		marker2.className = 'detected-comment-ruler';
		marker2.style.top = ( parentRect.top + parentRect.height + scrollTop ) + 'px';
		marker2.style.height = ( rect.top - ( parentRect.top + parentRect.height ) + 10 ) + 'px';
		if ( rtl ) {
			marker2.style.right = ( initialOffset - indentWidth / 2 + comment.parent.level * indentWidth ) + 'px';
			marker2.style.width = ( ( comment.level - comment.parent.level ) * indentWidth - indentWidth / 2 ) + 'px';
		} else {
			marker2.style.left = ( initialOffset - indentWidth / 2 + comment.parent.level * indentWidth ) + 'px';
			marker2.style.width = ( ( comment.level - comment.parent.level ) * indentWidth - indentWidth / 2 ) + 'px';
		}
		document.body.appendChild( marker2 );
	}

	for ( i = 0; i < comment.replies.length; i++ ) {
		markComment( comment.replies[ i ] );
	}
}

function markThreads( threads ) {
	var i;
	for ( i = 0; i < threads.length; i++ ) {
		markComment( threads[ i ] );
	}
	// Reverse order so that box-shadows look right
	// eslint-disable-next-line no-jquery/no-global-selector
	$( 'body' ).append( $( '.detected-comment-ruler' ).get().reverse() );
}

module.exports = {
	markThreads: markThreads,
	markTimestamp: markTimestamp,
	markSignature: markSignature
};