/**
 * Creates an es.ContextView object.
 * 
 * @class
 * @constructor
 * @param {jQuery} $overlay DOM selection to add nodes to
 */
es.ContextView = function( surfaceView, $overlay ) {
	var _this = this;

	// Properties
	this.surfaceView = surfaceView;
	this.$ = $( '<div class="es-contextView"></div>' ).appendTo( $overlay || $( 'body' ) );
	this.$panels = $( '<div class="es-contextView-panels"></div>' ).appendTo( this.$ );
	this.$toolbar = $( '<div class="es-contextView-toolbar"></div>' );
	this.toolbarView = new es.ToolbarView(
		this.$toolbar,
		this.surfaceView,
		[{ 'name': 'textStyle', 'items' : [ 'bold', 'italic', 'link', 'clear' ] }]
	);
	this.menuView = new es.MenuView( [
			// Example menu items
			{ 'name': 'tools', '$': this.$toolbar }
		],
		null,
		this.$
	);
	this.$icon = $( '<div class="es-contextView-icon"></div>' ).appendTo( this.$ );
	
	// Example panel
	this.$panels.append(
		'<div class="es-contextView-panel" rel="link">' +
			'<div><label>Page title or URL <input type="text"></label></div>' +
			'<div><a href="#cancel">Cancel</a> <button>Change</button></div>' +
		'</div>'
	);
	this.$panels.find( '[href="#cancel"]' ).click( function( e ) {
		_this.$panels.children().hide();
		e.preventDefault();
		return false;
	} );

	// Events
	this.$icon.bind( {
		'mousedown': function( e ) {
			if ( e.which === 1 ) {
				e.preventDefault();
				return false;
			}
		},
		'mouseup': function( e ) {
			if ( e.which === 1 ) {
				_this.menuView.toggle();
			}
		}
	} );
};

/* Methods */

es.ContextView.prototype.set = function() {
	this.$.removeClass(
		'es-contextView-position-below es-contextView-position-above ' +
		'es-contextView-position-left es-contextView-position-right ' +
		'es-contextView-position-start es-contextView-position-end'
	);
	var selection = this.surfaceView.getModel().getSelection(),
		position,
		offset;
	if ( selection.from < selection.to ) {
		var $lastRange = this.surfaceView.$.find( '.es-contentView-range:visible:last' );
		if ( $lastRange.length ) {
			offset = $lastRange.offset();
			position = new es.Position(
				offset.left + $lastRange.width(), offset.top + $lastRange.height()
			);
			this.$.addClass( 'es-contextView-position-end' );
		}
	} else if ( selection.from > selection.to ) {
		var $firstRange = this.surfaceView.$.find( '.es-contentView-range:visible:first' );
		if ( $firstRange.length ) {
			offset = $firstRange.offset();
			position = new es.Position( offset.left, offset.top );
			this.$.addClass( 'es-contextView-position-start' );
		}
	}
	if ( position ) {
		var $menu = this.menuView.$,
			menuMargin = 5,
			menuWidth = $menu.width(),
			menuHeight = $menu.height(),
			$window = $( window ),
			windowWidth = $window.width(),
			windowHeight = $window.height(),
			windowScrollTop = $window.scrollTop();
		// Center align menu
		var menuLeft = -Math.round( menuWidth / 2 );
		// Adjust menu left or right depending on viewport
		if ( ( position.left - menuMargin ) + menuLeft < 0 ) {
			// Move right a bit past center
			menuLeft -= position.left + menuLeft - menuMargin;
		} else if ( ( menuMargin + position.left ) - menuLeft > windowWidth ) {
			// Move left a bit past center
			menuLeft += windowWidth - menuMargin - ( position.left - menuLeft );
		}
		$menu.css( 'left', menuLeft );
		// Position menu on top or bottom depending on viewport
		if ( position.top + menuHeight + ( menuMargin * 2 ) < windowHeight + windowScrollTop ) {
			this.$.addClass( 'es-contextView-position-below' );
		} else {
			this.$.addClass( 'es-contextView-position-above' );
		}
		this.$.css( { 'left': position.left, 'top': position.top } );
		this.$icon.fadeIn( 'fast' );
	}
};

es.ContextView.prototype.clear = function() {
	this.$panels.hide().children().hide();
	this.$icon.hide();
	this.menuView.hide();
};