/* 
 *   Copyright (C) 2014
 *   This file is part of WvS VPlan.
 *
 *   WvS VPlan is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU Affero General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU Affero General Public License for more details.
 *
 *   You should have received a copy of the GNU Affero General Public License
 *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

function show_pdf(url){
    $('#input').attr('src', url);

    console.log("Download fertig, parse PDF");

    var input = document.getElementById("input");
    var processor = document.getElementById("processor");
    var output = document.getElementById("output");

    window.addEventListener("message", function(event){
        if(event.source != processor.contentWindow) return;

        switch(event.data){
            case "ready":
                var xhr = new XMLHttpRequest;
                xhr.open("GET", input.getAttribute("src"), true);
                xhr.responseType = "arraybuffer";

                xhr.onload = function(event){
                    processor.contentWindow.postMessage(this.response, "*");
                };

                xhr.send();
                break;

            default:
                output.textContent = event.data.replace(/\s+/g, " ");
                break;
        }
    }, true);
}

function fail(text){
    alert("Etwas ist schiefgelaufen: " + text.toString());
}

function download_pdf(link){
    var filename = link.substring(link.lastIndexOf('/') + 1);

    window.requestFileSystem(
            LocalFileSystem.PERSISTENT, 0,
            function onFileSystemSuccess(fileSystem){
                fileSystem.root.getFile(
                    filename, {create: true, exclusive: false},
                    function gotFileEntry(fileEntry){
                        var sPath = "/storage/sdcard0" + fileEntry.fullPath; // !!! TODO Unterstützung anderer Geräte
                        console.log("Pfad: " + sPath);
                        var fileTransfer = new FileTransfer();
                        fileEntry.remove();

                        fileTransfer.download(
                            link,
                            sPath,
                            function(theFile){
                                console.log("Download fertig: " + theFile.toURL());
                                show_pdf(theFile.toURL());
                            },
                            function(error){
                                console.log("Fehler: " + error.source + " - "+ error.target + " - " + error.code);
                            }
                            );
                    },
                    fail);
            },
            fail);
}

function get_plan(link){
    var request = $.ajax({
        type: "GET",
        url: link
    });

    request.done(function(result){
        var pdf_re = new RegExp("(http://***REMOVED***\\.de/moodle/pluginfile\\.php/\\d+/mod_resource/content/\\d+.*?\\.pdf)");
        var pdflink = pdf_re.exec(result)[1];

        console.log('Plan gefunden: ' + pdflink);

        download_pdf(pdflink);
    });

    request.fail(function(jqXHR, textStatus){
        alert("Etwas ist schiefgelaufen: " + textStatus);
    });
}

function get_overview(link){
    var request = $.ajax({
        type: "GET",
        url: link
    });

    request.done(function(result){
        var plans_re = new RegExp("window\\.open\\(&#039;(http://***REMOVED***\\.de/moodle/mod/resource/view\\.php\\?id=\\d+)&amp;redirect=1&#039;\\)");
        var links = plans_re.exec(result);

        for(var i = 1; i < links.length; i += 2){
            console.log('suche Plan ' + links[i]);
            get_plan(links[i]);
        }

        console.log('Übersichts-Request erfolgreich');

        location.href = '#overview';
    });

    request.fail(function(jqXHR, textStatus){
        alert("Etwas ist schiefgelaufen: " + textStatus);
    });
}

function login(){
    $.mobile.loading("show", {
        text: "Lade...",
        textVisible: true,
        theme: "b",
    });

    var username = encodeURIComponent($("#username").val());
    var password = encodeURIComponent($("#password").val());
    var params = "username=" + username + "&password=" + password;

    var request = $.ajax({
        type: "POST",
        url: "https://***REMOVED***/moodle/login/index.php",
        data: {username: username, password: password}
    });
    request.done(function(result){
        var vertretungs_re = new RegExp("title=\"Vertretungsplan\" href=\"(http://***REMOVED***\\.de/moodle/course/view\\.php\\?id=\\d+)");
        var link = vertretungs_re.exec(result)[1];

        console.log('Login-Request erfolgreich: ' + link);

        get_overview(link);
    });

    request.fail(function(jqXHR, textStatus){
        alert("Etwas ist schiefgelaufen: " + textStatus);
    });
}

var app = {
    // Application Constructor
    initialize: function() {
        this.bindEvents();
    },
    // Bind Event Listeners
    //
    // Bind any events that are required on startup. Common events are:
    // 'load', 'deviceready', 'offline', and 'online'.
    bindEvents: function() {
        document.addEventListener('deviceready', this.onDeviceReady, false);
    },
    // deviceready Event Handler
    //
    // The scope of 'this' is the event. In order to call the 'receivedEvent'
    // function, we must explicity call 'app.receivedEvent(...);'
    onDeviceReady: function() {
        app.receivedEvent('deviceready');
    },
    // Update DOM on a Received Event
    receivedEvent: function(id) {
        /* var parentElement = document.getElementById(id);
        var listeningElement = parentElement.querySelector('.listening');
        var receivedElement = parentElement.querySelector('.received');

        listeningElement.setAttribute('style', 'display:none;');
        receivedElement.setAttribute('style', 'display:block;');

        */
        console.log('Received Event: ' + id);
    }
};