/*!

 * http://jqueryui.com

 *

 * Copyright jQuery Foundation and other contributors

 * Released under the MIT license.

 * http://jquery.org/license

 */

//>>label: Bounce Effect

//>>group: Effects

//>>description: Bounces an element horizontally or vertically n times.

//>>docs: http://api.jqueryui.com/bounce-effect/

//>>demos: http://jqueryui.com/effect/

( function( factory ) {

	if ( typeof define === "function" && define.amd ) {

		// AMD. Register as an anonymous module.

		define( [

			"jquery",

			"./effect"

		], factory );

	} else {

		// Browser globals

		factory( jQuery );

	}

return $.effects.define( "bounce", function( options, done ) {

	var upAnim, downAnim, refValue,

		element = $( this ),

		// Defaults:

		mode = options.mode,

		hide = mode === "hide",

		show = mode === "show",

		direction = options.direction || "up",

		distance = options.distance,

		times = options.times || 5,

		// Number of internal animations

		anims = times * 2 + ( show || hide ? 1 : 0 ),

		speed = options.duration / anims,

		easing = options.easing,

		// Utility:

		ref = ( direction === "up" || direction === "down" ) ? "top" : "left",

		motion = ( direction === "up" || direction === "left" ),

		i = 0,

		queuelen = element.queue().length;

	$.effects.createPlaceholder( element );

	refValue = element.css( ref );

	// Default distance for the BIGGEST bounce is the outer Distance / 3

	if ( !distance ) {

		distance = element[ ref === "top" ? "outerHeight" : "outerWidth" ]() / 3;

	}

	if ( show ) {

		downAnim = { opacity: 1 };

		downAnim[ ref ] = refValue;

		// If we are showing, force opacity 0 and set the initial position

		// then do the "first" animation

		element

			.css( "opacity", 0 )

			.css( ref, motion ? -distance * 2 : distance * 2 )

			.animate( downAnim, speed, easing );

	}

	// Start at the smallest distance if we are hiding

	if ( hide ) {

		distance = distance / Math.pow( 2, times - 1 );

	}

	downAnim = {};

	downAnim[ ref ] = refValue;

	// Bounces up/down/left/right then back to 0 -- times * 2 animations happen here

	for ( ; i < times; i++ ) {

		upAnim = {};

		upAnim[ ref ] = ( motion ? "-=" : "+=" ) + distance;

		element

			.animate( upAnim, speed, easing )

			.animate( downAnim, speed, easing );

		distance = hide ? distance * 2 : distance / 2;

	}

	// Last Bounce when Hiding

	if ( hide ) {

		upAnim = { opacity: 0 };

		upAnim[ ref ] = ( motion ? "-=" : "+=" ) + distance;

		element.animate( upAnim, speed, easing );

	}

	element.queue( done );

	$.effects.unshift( element, queuelen, anims + 1 );

} );