/*!
 * VisualEditor DataModel MWReferenceListNode class.
 *
 * @copyright 2011-2013 VisualEditor Team and others; see AUTHORS.txt
 * @license The MIT License (MIT); see LICENSE.txt
 */

/**
 * DataModel MediaWiki reference list node.
 *
 * @class
 * @extends ve.dm.BranchNode
 * @constructor
 * @param {number} [length] Length of content data in document; ignored and overridden to 0
 * @param {Object} [element] Reference to element in linear model
 */
ve.dm.MWReferenceListNode = function VeDmMWReferenceListNode( length, element ) {
	// Parent constructor
	ve.dm.BranchNode.call( this, 0, element );
};

/* Inheritance */

OO.inheritClass( ve.dm.MWReferenceListNode, ve.dm.BranchNode );

/* Static members */

ve.dm.MWReferenceListNode.static.name = 'mwReferenceList';

ve.dm.MWReferenceListNode.static.handlesOwnChildren = true;

ve.dm.MWReferenceListNode.static.matchTagNames = null;

ve.dm.MWReferenceListNode.static.matchRdfaTypes = [ 'mw:Extension/references' ];

ve.dm.MWReferenceListNode.static.storeHtmlAttributes = false;

ve.dm.MWReferenceListNode.static.toDataElement = function ( domElements, converter ) {
	var referenceListData, $contents, contentsData,
		mwDataJSON = domElements[0].getAttribute( 'data-mw' ),
		mwData = mwDataJSON ? JSON.parse( mwDataJSON ) : {},
		refGroup = mwData.attrs && mwData.attrs.group || '',
		listGroup = 'mwReference/' + refGroup;

	referenceListData = {
		'type': this.name,
		'attributes': {
			'mw': mwData,
			'originalMw': mwDataJSON,
			'domElements': ve.copy( domElements ),
			'refGroup': refGroup,
			'listGroup': listGroup
		}
	};
	if ( mwData.body && mwData.body.html ) {
		$contents = $( '<div>' ).append( mwData.body.html );
		contentsData = converter.getDataFromDomRecursionClean( $contents[0] );
		return [ referenceListData ].
			concat( contentsData ).
			concat( [ { 'type': '/' + this.name } ] );
	} else {
		return referenceListData;
	}

};

ve.dm.MWReferenceListNode.static.toDomElements = function ( data, doc, converter ) {
	var el, els, mwData, originalMw, wrapper, contentsHtml, originalHtml,
		dataElement = data[0],
		attribs = dataElement.attributes,
		contentsData = data.slice( 1, -1 );

	if ( attribs.domElements ) {
		// If there's more than 1 element, preserve entire array, not just first element
		els = ve.copyDomElements( attribs.domElements, doc );
		el = els[0];
	} else {
		el = doc.createElement( 'div' );
		els = [ el ];
	}

	mwData = attribs.mw ? ve.copy( attribs.mw ) : {};

	mwData.name = 'references';

	if ( attribs.refGroup ) {
		ve.setProp( mwData, 'attrs', 'group', attribs.refGroup );
	} else if ( mwData.attrs ) {
		delete mwData.attrs.refGroup;
	}

	el.setAttribute( 'typeof', 'mw:Extension/references' );

	if ( contentsData.length > 2 ) {
		wrapper = doc.createElement( 'div' );
		converter.getDomSubtreeFromData( data.slice( 1, -1 ), wrapper );
		contentsHtml = $( wrapper ).html(); // Returns '' if wrapper is empty
		originalHtml = ve.getProp( mwData, 'body', 'html' ) || '';
		// Only set body.html if contentsHtml and originalHtml are actually different
		if ( !$( '<div>' ).html( originalHtml ).get( 0 ).isEqualNode( wrapper ) ) {
			ve.setProp( mwData, 'body', 'html', contentsHtml );
		}
	}

	// If mwData and originalMw are the same, use originalMw to prevent reserialization.
	// Reserialization has the potential to reorder keys and so change the DOM unnecessarily
	originalMw = attribs.originalMw;
	if ( originalMw && ve.compare( mwData, JSON.parse( originalMw ) ) ) {
		el.setAttribute( 'data-mw', originalMw );
	} else {
		el.setAttribute( 'data-mw', JSON.stringify( mwData ) );
	}

	return els;
};

/* Registration */

ve.dm.modelRegistry.register( ve.dm.MWReferenceListNode );