/**
 * Extend the RegExp object with an escaping function
 * From http://simonwillison.net/2006/Jan/20/escape/
 */
RegExp.escape = function( s ) { return s.replace(/([.*+?^${}()|\/\\[\]])/g, '\\$1'); };

/**
 * Dialog Module for wikiEditor
 */
( function( $ ) { $.wikiEditor.modules.dialogs = {

/**
 * Compatability map
 */
'browsers': {
	// Left-to-right languages
	'ltr': {
		'msie': [['>=', 7]],
		// jQuery UI appears to be broken in FF 2.0 - 2.0.0.4
		'firefox': [
			['>=', 2], ['!=', '2.0'], ['!=', '2.0.0.1'], ['!=', '2.0.0.2'], ['!=', '2.0.0.3'], ['!=', '2.0.0.4']
		],
		'opera': [['>=', 9.6]],
		'safari': [['>=', 3]],
		'chrome': [['>=', 3]]
	},
	// Right-to-left languages
	'rtl': {
		'msie': [['>=', 7]],
		// jQuery UI appears to be broken in FF 2.0 - 2.0.0.4
		'firefox': [
			['>=', 2], ['!=', '2.0'], ['!=', '2.0.0.1'], ['!=', '2.0.0.2'], ['!=', '2.0.0.3'], ['!=', '2.0.0.4']
		],
		'opera': [['>=', 9.6]],
		'safari': [['>=', 3]],
		'chrome': [['>=', 3]]
	}
},
/**
 * API accessible functions
 */
api: {
	addDialog: function( context, data ) {
		$.wikiEditor.modules.dialogs.fn.create( context, data )
	},
	openDialog: function( context, module ) {
		if ( module in $.wikiEditor.modules.dialogs.modules ) {
			var mod = $.wikiEditor.modules.dialogs.modules[module];
			var $dialog = $( '#' + mod.id );
			if ( $dialog.length == 0 ) {
				$.wikiEditor.modules.dialogs.fn.reallyCreate( context, mod );
				$dialog = $( '#' + mod.id );
			}
			
			// Workaround for bug in jQuery UI: close button in top right retains focus
			$dialog.closest( '.ui-dialog' )
				.find( '.ui-dialog-titlebar-close' )
				.removeClass( 'ui-state-focus' );
			
			$dialog.dialog( 'open' );
		}
	},
	closeDialog: function( context, module ) {
		if ( module in $.wikiEditor.modules.dialogs.modules ) {
			$( '#' + $.wikiEditor.modules.dialogs.modules[module].id ).dialog( 'close' );
		}
	}
},
/**
 * Internally used functions
 */
fn: {
	/**
	 * Creates a dialog module within a wikiEditor
	 *
	 * @param {Object} context Context object of editor to create module in
	 * @param {Object} config Configuration object to create module from
	 */
	create: function( context, config ) {
		// Defer building of modules, but do check whether they need the iframe rightaway
		for ( mod in config ) {
			var module = config[mod];
			// Only create the dialog if it's supported, isn't filtered and doesn't exist yet
			var filtered = false;
			if ( typeof module.filters != 'undefined' ) {
				for ( var i = 0; i < module.filters.length; i++ ) {
					if ( $( module.filters[i] ).length == 0 ) {
						filtered = true;
						break;
					}
				}
			}
			if ( !filtered && $.wikiEditor.isSupported( module ) && $( '#' + module.id ).size() == 0 ) {
				$.wikiEditor.modules.dialogs.modules[mod] = module;
				// If this dialog requires the iframe, set it up
				if ( typeof context.$iframe == 'undefined' && $.wikiEditor.isRequired( module, 'iframe' ) ) {
					context.fn.setupIframe();
				}
				context.$textarea.trigger( 'wikiEditor-dialogs-setup-' + mod );
			}
		}
	},
	/**
	 * Build the actual dialog. This done on-demand rather than in create()
	 * @param {Object} context Context object of editor dialog belongs to
	 * @param {Object} module Dialog module object
	 */
	reallyCreate: function( context, module ) {
		var configuration = module.dialog;
		// Add some stuff to configuration
		configuration.bgiframe = true;
		configuration.autoOpen = false;
		configuration.modal = true;
		configuration.title = $.wikiEditor.autoMsg( module, 'title' );
		// Transform messages in keys
		// Stupid JS won't let us do stuff like
		// foo = { mediaWiki.msg.get( 'bar' ): baz }
		configuration.newButtons = {};
		for ( msg in configuration.buttons )
			configuration.newButtons[mediaWiki.msg.get( msg )] = configuration.buttons[msg];
		configuration.buttons = configuration.newButtons;
		// Create the dialog <div>
		var dialogDiv = $( '<div />' )
			.attr( 'id', module.id )
			.html( module.html )
			.data( 'context', context )
			.appendTo( $( 'body' ) )
			.each( module.init )
			.dialog( configuration );
		// Set tabindexes on buttons added by .dialog()
		$.wikiEditor.modules.dialogs.fn.setTabindexes( dialogDiv.closest( '.ui-dialog' )
			.find( 'button' ).not( '[tabindex]' ) );
		if ( !( 'resizeme' in module ) || module.resizeme ) {
			dialogDiv
				.bind( 'dialogopen', $.wikiEditor.modules.dialogs.fn.resize )
				.find( '.ui-tabs' ).bind( 'tabsshow', function() {
					$(this).closest( '.ui-dialog-content' ).each(
						$.wikiEditor.modules.dialogs.fn.resize );
				});
		}
		dialogDiv.bind( 'dialogclose', function() {
			context.fn.restoreSelection();
		} );
		
		// Let the outside world know we set up this dialog
		context.$textarea.trigger( 'wikiEditor-dialogs-loaded-' + mod );
	},
	/**
	 * Resize a dialog so its contents fit
	 *
	 * Usage: dialog.each( resize ); or dialog.bind( 'blah', resize );
	 * NOTE: This function assumes $j.ui.dialog has already been loaded
	 */
	resize: function() {
		var wrapper = $(this).closest( '.ui-dialog' );
		var oldWidth = wrapper.width();
		// Make sure elements don't wrapped so we get an accurate idea of whether they really fit. Also temporarily show
		// hidden elements. Work around jQuery bug where <div style="display:inline;" /> inside a dialog is both
		// :visible and :hidden
		var oldHidden = $(this).find( '*' ).not( ':visible' );
		// Save the style attributes of the hidden elements to restore them later. Calling hide() after show() messes up
		// for elements hidden with a class
		oldHidden.each( function() {
			$(this).data( 'oldstyle', $(this).attr( 'style' ) );
		});
		oldHidden.show();
		var oldWS = $(this).css( 'white-space' );
		$(this).css( 'white-space', 'nowrap' );
		if ( wrapper.width() <= $(this).get(0).scrollWidth ) {
			var thisWidth = $(this).data( 'thisWidth' ) ? $(this).data( 'thisWidth' ) : 0;
			thisWidth = Math.max( $(this).get(0).scrollWidth, thisWidth );
			$(this).width( thisWidth );
			$(this).data( 'thisWidth', thisWidth );
			var wrapperWidth = $(this).data( 'wrapperWidth' ) ? $(this).data( 'wrapperWidth' ) : 0;
			wrapperWidth = Math.max( wrapper.get(0).scrollWidth, wrapperWidth );
			wrapper.width( wrapperWidth );
			$(this).data( 'wrapperWidth', wrapperWidth );
			$(this).dialog( { 'width': wrapper.width() } );
			wrapper.css( 'left', parseInt( wrapper.css( 'left' ) ) - ( wrapper.width() - oldWidth ) / 2 );
		}
		$(this).css( 'white-space', oldWS );
		oldHidden.each( function() {
			$(this).attr( 'style', $(this).data( 'oldstyle' ) );
		});		
	},
	/**
	 * Set the right tabindexes on elements in a dialog
	 * @param $elements Elements to set tabindexes on. If they already have tabindexes, this function can behave a bit weird
	 */
	setTabindexes: function( $elements ) {
		// Get the highest tab index
		var tabIndex = $( document ).lastTabIndex() + 1;
		$elements.each( function() {
			$j(this).attr( 'tabindex', tabIndex++ );
		} );
	}
},
// This stuff is just hanging here, perhaps we could come up with a better home for this stuff
modules: {},
quickDialog: function( body, settings ) {
	$( '<div />' )
		.text( body )
		.appendTo( $( 'body' ) )
		.dialog( $.extend( {
			bgiframe: true,
			modal: true
		}, settings ) )
		.dialog( 'open' );
}

}; } ) ( jQuery );