/*!

 * http://briancherne.github.io/jquery-hoverIntent/

 *

 * You may use hoverIntent under the terms of the MIT license. Basically that

 * means you are free to use hoverIntent as long as this header is left intact.

 * Copyright 2007-2019 Brian Cherne

 */

/**

 * hoverIntent is similar to jQuery's built-in "hover" method except that

 * instead of firing the handlerIn function immediately, hoverIntent checks

 * to see if the user's mouse has slowed down (beneath the sensitivity

 * threshold) before firing the event. The handlerOut function is only

 * called after a matching handlerIn.

 *

 * // basic usage ... just like .hover()

 * .hoverIntent( handlerIn, handlerOut )

 * .hoverIntent( handlerInOut )

 *

 * // basic usage ... with event delegation!

 * .hoverIntent( handlerIn, handlerOut, selector )

 * .hoverIntent( handlerInOut, selector )

 *

 * // using a basic configuration object

 * .hoverIntent( config )

 *

 * @param  handlerIn   function OR configuration object

 * @param  handlerOut  function OR selector for delegation OR undefined

 * @param  selector    selector OR undefined

 * @author Brian Cherne <brian(at)cherne(dot)net>

 */

;(function(factory) {

    'use strict';

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

        define(['jquery'], factory);

    } else if (typeof module === 'object' && module.exports) {

        module.exports = factory(require('jquery'));

    } else if (jQuery && !jQuery.fn.hoverIntent) {

        factory(jQuery);

    }

})(function($) {

    'use strict';

    // default configuration values

    var _cfg = {

        interval: 100,

        sensitivity: 6,

        timeout: 0

    };

    // counter used to generate an ID for each instance

    var INSTANCE_COUNT = 0;

    // current X and Y position of mouse, updated during mousemove tracking (shared across instances)

    var cX, cY;

    // saves the current pointer position coordinates based on the given mousemove event

    var track = function(ev) {

        cX = ev.pageX;

        cY = ev.pageY;

    };

    // compares current and previous mouse positions

    var compare = function(ev,$el,s,cfg) {

        // compare mouse positions to see if pointer has slowed enough to trigger `over` function

        if ( Math.sqrt( (s.pX-cX)*(s.pX-cX) + (s.pY-cY)*(s.pY-cY) ) < cfg.sensitivity ) {

            $el.off(s.event,track);

            delete s.timeoutId;

            // set hoverIntent state as active for this element (permits `out` handler to trigger)

            s.isActive = true;

            // overwrite old mouseenter event coordinates with most recent pointer position

            ev.pageX = cX; ev.pageY = cY;

            // clear coordinate data from state object

            delete s.pX; delete s.pY;

            return cfg.over.apply($el[0],[ev]);

        } else {

            // set previous coordinates for next comparison

            s.pX = cX; s.pY = cY;

            // use self-calling timeout, guarantees intervals are spaced out properly (avoids JavaScript timer bugs)

            s.timeoutId = setTimeout( function(){compare(ev, $el, s, cfg);} , cfg.interval );

        }

    };

    // triggers given `out` function at configured `timeout` after a mouseleave and clears state

    var delay = function(ev,$el,s,out) {

        var data = $el.data('hoverIntent');

        if (data) {

            delete data[s.id];

        }

        return out.apply($el[0],[ev]);

    };

    $.fn.hoverIntent = function(handlerIn,handlerOut,selector) {

        // instance ID, used as a key to store and retrieve state information on an element

        var instanceId = INSTANCE_COUNT++;

        // extend the default configuration and parse parameters

        var cfg = $.extend({}, _cfg);

        if ( $.isPlainObject(handlerIn) ) {

            cfg = $.extend(cfg, handlerIn);

                cfg.out = cfg.over;

            }

            cfg = $.extend(cfg, { over: handlerIn, out: handlerOut, selector: selector } );

        } else {

            cfg = $.extend(cfg, { over: handlerIn, out: handlerIn, selector: handlerOut } );

        }

        // A private function for handling mouse 'hovering'

        var handleHover = function(e) {

            // cloned event to pass to handlers (copy required for event object to be passed in IE)

            var ev = $.extend({},e);

            // the current target of the mouse event, wrapped in a jQuery object

            var $el = $(this);

            // read hoverIntent data from element (or initialize if not present)

            var hoverIntentData = $el.data('hoverIntent');

            if (!hoverIntentData) { $el.data('hoverIntent', (hoverIntentData = {})); }

            // read per-instance state from element (or initialize if not present)

            var state = hoverIntentData[instanceId];

            if (!state) { hoverIntentData[instanceId] = state = { id: instanceId }; }

            // state properties:

            // id = instance ID, used to clean up data

            // timeoutId = timeout ID, reused for tracking mouse position and delaying "out" handler

            // isActive = plugin state, true after `over` is called just until `out` is called

            // pX, pY = previously-measured pointer coordinates, updated at each polling interval

            // event = string representing the namespaced event used for mouse tracking

            // clear any existing timeout

            if (state.timeoutId) { state.timeoutId = clearTimeout(state.timeoutId); }

            // namespaced event used to register and unregister mousemove tracking

            var mousemove = state.event = 'mousemove.hoverIntent.hoverIntent'+instanceId;

            // handle the event, based on its type

            if (e.type === 'mouseenter') {

                // do nothing if already active

                if (state.isActive) { return; }

                // set "previous" X and Y position based on initial entry point

                state.pX = ev.pageX; state.pY = ev.pageY;

                // update "current" X and Y position based on mousemove

                $el.off(mousemove,track).on(mousemove,track);

                // start polling interval (self-calling timeout) to compare mouse coordinates over time

                state.timeoutId = setTimeout( function(){compare(ev,$el,state,cfg);} , cfg.interval );

            } else { // "mouseleave"

                // do nothing if not already active

                if (!state.isActive) { return; }

                // unbind expensive mousemove event

                $el.off(mousemove,track);

                // if hoverIntent state is true, then call the mouseOut function after the specified delay

                state.timeoutId = setTimeout( function(){delay(ev,$el,state,cfg.out);} , cfg.timeout );

            }

        };

        // listen for mouseenter and mouseleave

        return this.on({'mouseenter.hoverIntent':handleHover,'mouseleave.hoverIntent':handleHover}, cfg.selector);

    };

});