/**
 * Touch component definition
 * this plugin can handle doubletap singletap and swipe actions
 * dependency - some lib that creates doubletap, singletap and swipe event like jquery.mobile-events
 */
Crocodoc.addPlugin('touch', function (scope) {

    'use strict';

    var $el,api,pluginConfig,$viewport,
        zoomActive = false;

    function createEventData(){
        return {
            zoomActive: zoomActive
        }
    }

    function handleDoubletap(event,touch) {
        api.fire('doubletap',createEventData());

        if(zoomActive){
            zoomActive = false;
            api.zoom(Crocodoc.ZOOM_FIT_WIDTH);
            return
        }

        scope.getConfig().currentLayout.setZoom(3,touch.secondTap.offset.y,touch.secondTap.offset.x);
        zoomActive = true;
        event.preventDefault();
    }

    /**
     * Handle single tap events
     * @param   {Event} event The event object
     * @returns {void}
     */
    function handleSingletap(event) {
        api.fire('singletap',createEventData());
        ( pluginConfig.onsingletap || $.noop )();
        event.preventDefault();
    }

    /**
     * Handle swipe left events
     * @param   {Event} event The event object
     * @returns {void}
     */
    function handleSwipeLeft(event) {
        api.fire('swipeleft',createEventData());
        if( ! zoomActive ){
            presentation.scrollTo(Crocodoc.SCROLL_NEXT);
        }
        event.preventDefault();
    }

    /**
     * Handle swipe right events
     * @param   {Event} event The event object
     * @returns {void}
     */
    function handleSwipeRight(event) {
        api.fire('swiperight',createEventData());
        if( ! zoomActive ){
            presentation.scrollTo(Crocodoc.SCROLL_PREVIOUS);
        }
        event.preventDefault();
    }

    /**
     * Handle zoom events
     * @param   {Object} data The event object
     * @returns {void}
     */
    function handleZoom(data) {
        //zoomActive = data.zoomMode !== Crocodoc.ZOOM_FIT_WIDTH;
        //
        //if( ! data.canZoomIn || ! data.canZoomOut ){
        //    zoomActive = false;
        //    api.zoom(Crocodoc.ZOOM_FIT_WIDTH);
        //}
    }

    //--------------------------------------------------------------------------
    // Public
    //--------------------------------------------------------------------------

    return {
        messages: ['zoom','pagefocus'],

        onmessage: function(name,data){
            switch (name) {
                case 'zoom':
                    handleZoom(data);
                    break;
                case 'pagefocus':
                    api.zoom(Crocodoc.ZOOM_FIT_WIDTH);
                    break;
            }
        },

        /**
         * Initialize the zoom component
         * @param   {Object} config
         * @returns {void}
         */
        init: function (config) {
            pluginConfig = config;
            config = scope.getConfig();
            $el = config.$el;
            api = config.api;
            $viewport = config.$viewport;
            $el.on('doubletap', handleDoubletap);
            $el.on('singletap', handleSingletap);

            $el.on('swipeleft',handleSwipeLeft);
            $el.on('swiperight',handleSwipeRight);
        },

        /**
         * Destroy the scroller component
         * @returns {void}
         */
        destroy: function () {
            $el.off('doubletap', handleDoubletap);
            $el.off('singletap', handleSingletap);
        }
    };
});