/*
The MIT License

Copyright (c) 2010 Michael Brooks

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/

(function(window) {

    /**
     * Do not use thumbs.js on touch-enabled devices
     * 
     * Thanks to Jesse MacFadyen (purplecabbage):
     * https://gist.github.com/850593#gistcomment-22484
     */
    try {
        document.createEvent('TouchEvent');
        return;
    }
    catch(e) {
    }

    /**
     * Map touch events to mouse events
     */
    var eventMap = {
        'mousedown': 'touchstart',
        'mouseup':   'touchend',
        'mousemove': 'touchmove'
    };

    /**
     * Fire touch events
     *
     * Monitor mouse events and fire a touch event on the
     * object broadcasting the mouse event. This approach
     * likely has poorer performance than hijacking addEventListener
     * but it is a little more browser friendly.
     */
    window.addEventListener('load', function() {
        for (var key in eventMap) {
            document.body.addEventListener(key, function(e) {
                // Supports:
                //   - addEventListener
                //   - setAttribute
                var event = createTouchEvent(eventMap[e.type], e);
                e.target.dispatchEvent(event);

                // Supports:
                //   - element.ontouchstart
                var fn = e.target['on' + eventMap[e.type]];
                if (typeof fn === 'function') fn(e);
            }, false);
        }
    }, false);

    /**
     * Utility function to create a touch event.
     *
     * @param  name  {String} of the event
     * @return event {Object}
     */
    var createTouchEvent = function(name, e) {
        var event = document.createEvent('MouseEvents');

        event.initMouseEvent(
            name,
            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
        );

        return event;
    };

})(window);