/**
 * 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.
 *
 * hoverIntent r7 // 2013.03.11 // jQuery 1.9.1+
 * http://cherne.net/brian/resources/jquery.hoverIntent.html
 *
 * 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, 2013 Brian Cherne
 *
 * // 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 ($) {
    $.fn.hoverIntent = function (handlerIn, handlerOut, selector) {

        // default configuration values
        var cfg = {
            interval: 100,
            sensitivity: 7,
            timeout: 0
        };

        if (typeof handlerIn === "object") {
            cfg = $.extend(cfg, handlerIn);
        } else if ($.isFunction(handlerOut)) {
            cfg = $.extend(cfg, { over: handlerIn, out: handlerOut, selector: selector });
        } else {
            cfg = $.extend(cfg, { over: handlerIn, out: handlerIn, selector: handlerOut });
        }

        // instantiate variables
        // cX, cY = current X and Y position of mouse, updated by mousemove event
        // pX, pY = previous X and Y position of mouse, set by mouseover and polling interval
        var cX, cY, pX, pY;

        // A private function for getting mouse position
        var track = function (ev) {
            cX = ev.pageX;
            cY = ev.pageY;
        };

        // A private function for comparing current and previous mouse position
        var compare = function (ev, ob) {
            ob.hoverIntent_t = clearTimeout(ob.hoverIntent_t);
            // compare mouse positions to see if they've crossed the threshold
            if (( Math.abs(pX - cX) + Math.abs(pY - cY) ) < cfg.sensitivity) {
                $(ob).off("mousemove.hoverIntent", track);
                // set hoverIntent state to true (so mouseOut can be called)
                ob.hoverIntent_s = 1;
                return cfg.over.apply(ob, [ev]);
            } else {
                // set previous coordinates for next time
                pX = cX;
                pY = cY;
                // use self-calling timeout, guarantees intervals are spaced out properly (avoids JavaScript timer bugs)
                ob.hoverIntent_t = setTimeout(function () {
                    compare(ev, ob);
                }, cfg.interval);
            }
        };

        // A private function for delaying the mouseOut function
        var delay = function (ev, ob) {
            ob.hoverIntent_t = clearTimeout(ob.hoverIntent_t);
            ob.hoverIntent_s = 0;
            return cfg.out.apply(ob, [ev]);
        };

        // A private function for handling mouse 'hovering'
        var handleHover = function (e) {
            // copy objects to be passed into t (required for event object to be passed in IE)
            var ev = jQuery.extend({}, e);
            var ob = this;

            // cancel hoverIntent timer if it exists
            if (ob.hoverIntent_t) {
                ob.hoverIntent_t = clearTimeout(ob.hoverIntent_t);
            }

            // if e.type == "mouseenter"
            if (e.type == "mouseenter") {
                // set "previous" X and Y position based on initial entry point
                pX = ev.pageX;
                pY = ev.pageY;
                // update "current" X and Y position based on mousemove
                $(ob).on("mousemove.hoverIntent", track);
                // start polling interval (self-calling timeout) to compare mouse coordinates over time
                if (ob.hoverIntent_s != 1) {
                    ob.hoverIntent_t = setTimeout(function () {
                        compare(ev, ob);
                    }, cfg.interval);
                }

                // else e.type == "mouseleave"
            } else {
                // unbind expensive mousemove event
                $(ob).off("mousemove.hoverIntent", track);
                // if hoverIntent state is true, then call the mouseOut function after the specified delay
                if (ob.hoverIntent_s == 1) {
                    ob.hoverIntent_t = setTimeout(function () {
                        delay(ev, ob);
                    }, cfg.timeout);
                }
            }
        };

        // listen for mouseenter and mouseleave
        return this.on({'mouseenter.hoverIntent': handleHover, 'mouseleave.hoverIntent': handleHover}, cfg.selector);
    };
})(jQuery);