/*
 * jquery.simulate - simulate browser mouse and keyboard events
 *
 * Copyright 2012, AUTHORS.txt (http://jqueryui.com/about)
 * Dual licensed under the MIT or GPL Version 2 licenses.
 * http://jquery.org/license
 *
 */

;(function( $ ) {

$.fn.extend({
	simulate: function( type, options ) {
		return this.each(function() {
			var opt = $.extend( {}, $.simulate.defaults, options );
			new $.simulate( this, type, opt );
		});
	}
});

$.simulate = function( el, type, options ) {
	this.target = el;
	this.options = options;

	if ( type === "drag" ) {
		this[ type ].apply( this, [ this.target, options ] );
	} else if ( type === "focus" || type === "blur" ) {
		this[ type ]();
	} else {
		this.simulateEvent( el, type, options );
	}
};

$.extend( $.simulate.prototype, {
	simulateEvent: function( el, type, options ) {
		var evt = this.createEvent( type, options );
		this.dispatchEvent( el, type, evt, options );
		return evt;
	},
	createEvent: function( type, options ) {
		if ( /^mouse(over|out|down|up|move)|(dbl)?click$/.test( type ) ) {
			return this.mouseEvent( type, options );
		} else if ( /^key(up|down|press)$/.test( type ) ) {
			return this.keyboardEvent( type, options );
		}
	},
	mouseEvent: function( type, options ) {
		var evt, eventDoc, doc, body;
		var e = $.extend({
			bubbles: true,
			cancelable: (type !== "mousemove"),
			view: window,
			detail: 0,
			screenX: 0,
			screenY: 0,
			clientX: 0,
			clientY: 0,
			ctrlKey: false,
			altKey: false,
			shiftKey: false,
			metaKey: false,
			button: 0,
			relatedTarget: undefined
		}, options );

		var relatedTarget = $( e.relatedTarget )[0];

		if ( $.isFunction( document.createEvent ) ) {
			evt = document.createEvent( "MouseEvents" );
			evt.initMouseEvent( type, e.bubbles, e.cancelable, e.view, e.detail,
				e.screenX, e.screenY, e.clientX, e.clientY,
				e.ctrlKey, e.altKey, e.shiftKey, e.metaKey,
				e.button, e.relatedTarget || document.body.parentNode );
			
			// IE 9+ creates events with pageX and pageY set to 0.
			// Trying to modify the properties throws an error,
			// so we define getters to return the correct values.
			if ( evt.pageX === 0 && evt.pageY === 0 && Object.defineProperty ) {
				eventDoc = evt.relatedTarget.ownerDocument || document;
				doc = eventDoc.documentElement;
				body = eventDoc.body;

				Object.defineProperty( evt, "pageX", {
					get: function() {
						return e.clientX +
							( doc && doc.scrollLeft || body && body.scrollLeft || 0 ) -
							( doc && doc.clientLeft || body && body.clientLeft || 0 );
					}
				});
				Object.defineProperty( evt, "pageY", {
					get: function() {
						return e.clientY +
							( doc && doc.scrollTop || body && body.scrollTop || 0 ) -
							( doc && doc.clientTop || body && body.clientTop || 0 );
					}
				});
			}
		} else if ( document.createEventObject ) {
			evt = document.createEventObject();
			$.extend( evt, e );
			evt.button = { 0:1, 1:4, 2:2 }[evt.button] || evt.button;
		}
		return evt;
	},
	keyboardEvent: function( type, options ) {
		var evt;

		var e = $.extend({
			bubbles: true,
			cancelable: true,
			view: window,
			ctrlKey: false,
			altKey: false,
			shiftKey: false,
			metaKey: false,
			keyCode: 0,
			charCode: undefined
		}, options );

		if ( $.isFunction( document.createEvent ) ) {
			try {
				evt = document.createEvent( "KeyEvents" );
				evt.initKeyEvent( type, e.bubbles, e.cancelable, e.view,
					e.ctrlKey, e.altKey, e.shiftKey, e.metaKey,
					e.keyCode, e.charCode );
			} catch( err ) {
				evt = document.createEvent( "Events" );
				evt.initEvent( type, e.bubbles, e.cancelable );
				$.extend(evt, {
					view: e.view,
					ctrlKey: e.ctrlKey,
					altKey: e.altKey,
					shiftKey: e.shiftKey,
					metaKey: e.metaKey,
					keyCode: e.keyCode,
					charCode: e.charCode
				});
			}
		} else if ( document.createEventObject ) {
			evt = document.createEventObject();
			$.extend( evt, e );
		}
		if ( $.browser.msie || $.browser.opera ) {
			evt.keyCode = (e.charCode > 0) ? e.charCode : e.keyCode;
			evt.charCode = undefined;
		}
		return evt;
	},

	dispatchEvent: function( el, type, evt ) {
		if ( el.dispatchEvent ) {
			el.dispatchEvent( evt );
		} else if ( el.fireEvent ) {
			el.fireEvent( "on" + type, evt );
		}
		return evt;
	},

	drag: function( el ) {
		var self = this,
			center = this.findCenter(this.target),
			options = this.options,
			x = Math.floor( center.x ),
			y = Math.floor( center.y ), 
			dx = options.dx || 0,
			dy = options.dy || 0,
			target = this.target,
			coord = { clientX: x, clientY: y };
		this.simulateEvent( target, "mousedown", coord );
		coord = { clientX: x + 1, clientY: y + 1 };
		this.simulateEvent( document, "mousemove", coord );
		coord = { clientX: x + dx, clientY: y + dy };
		this.simulateEvent( document, "mousemove", coord );
		this.simulateEvent( document, "mousemove", coord );
		this.simulateEvent( target, "mouseup", coord );
		this.simulateEvent( target, "click", coord );
	},
	findCenter: function( el ) {
		var el = $( this.target ),
			o = el.offset(),
			d = $( document );
		return {
			x: o.left + el.outerWidth() / 2 - d.scrollLeft(),
			y: o.top + el.outerHeight() / 2 - d.scrollTop()
		};
	},

	focus: function() {
		var focusinEvent,
			triggered = false,
			element = $( this.target );

		function trigger() {
			triggered = true;
		}

		element.bind( "focus", trigger );
		element[ 0 ].focus();

		if ( !triggered ) {
			focusinEvent = $.Event( "focusin" );
			focusinEvent.preventDefault();
			element.trigger( focusinEvent );
			element.triggerHandler( "focus" );
		}
		element.unbind( "focus", trigger );
	},

	blur: function() {
		var focusoutEvent,
			triggered = false,
			element = $( this.target );

		function trigger() {
			triggered = true;
		}

		element.bind( "blur", trigger );
		element[ 0 ].blur();

		// blur events are async in IE
		setTimeout(function() {
			// IE won't let the blur occur if the window is inactive
			if ( element[ 0 ].ownerDocument.activeElement === element[ 0 ] ) {
				element[ 0 ].ownerDocument.body.focus();
			}

			// Firefox won't trigger events if the window is inactive
			// IE doesn't trigger events if we had to manually focus the body
			if ( !triggered ) {
				focusoutEvent = $.Event( "focusout" );
				focusoutEvent.preventDefault();
				element.trigger( focusoutEvent );
				element.triggerHandler( "blur" );
			}
			element.unbind( "blur", trigger );
		}, 1 );
	}
});

$.extend( $.simulate, {
	defaults: {
		speed: "sync"
	},
	VK_TAB: 9,
	VK_ENTER: 13,
	VK_ESC: 27,
	VK_PGUP: 33,
	VK_PGDN: 34,
	VK_END: 35,
	VK_HOME: 36,
	VK_LEFT: 37,
	VK_UP: 38,
	VK_RIGHT: 39,
	VK_DOWN: 40
});

})( jQuery );
