/*!
 * VisualEditor UserInterface MediaWiki UseExistingReferenceCommand class.
 *
 * @copyright 2011-2014 VisualEditor Team and others; see http://ve.mit-license.org
 */

/**
 * Use existing reference command.
 *
 * @class
 * @extends ve.ui.Command
 *
 * @constructor
 */
ve.ui.MWUseExistingReferenceCommand = function VeUiMWUseExistingReferenceCommand() {
	// Parent constructor
	ve.ui.MWUseExistingReferenceCommand.super.call(
		this, 'reference/existing', 'window', 'open',
		{ args: [ 'reference', { useExisting: true } ], supportedSelections: ['linear'] }
	);
};

/* Inheritance */

OO.inheritClass( ve.ui.MWUseExistingReferenceCommand, ve.ui.Command );

/* Methods */

/**
 * @inheritdoc
 */
ve.ui.MWUseExistingReferenceCommand.prototype.isExecutable = function ( fragment ) {
	// Parent method
	if ( !ve.ui.MWUseExistingReferenceCommand.super.prototype.isExecutable.apply( this, arguments ) ) {
		return false;
	}

	var groupName,
		groups = fragment.getDocument().getInternalList().getNodeGroups();

	for ( groupName in groups ) {
		if ( groupName.lastIndexOf( 'mwReference/' ) === 0 && groups[groupName].indexOrder.length ) {
			return true;
		}
	}
	return false;
};

/* Registration */

ve.ui.commandRegistry.register( new ve.ui.MWUseExistingReferenceCommand() );