/* 
 *   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 setDNT(dntrack){
    dntrack = dntrack.toString();

    _paq.push(['setDoNotTrack', dntrack]);
    localStorage.setItem('dntrack', dntrack);
    $('#disclaimerpopup').popup('close');
    $('#dntflip').val(dntrack);
}

function track(what){
    _paq.push(['setCustomUrl', what]);
    _paq.push(['trackPageView', what]);
}

function trackPlan(vdate){
    track('ui/tab/plan');
    track('plan/' + vdate.format('YYYY/MM/DD'));
}

$('#settingspanel').on('panelclose', function(){
    localStorage.setItem('dntrack', $('#dntflip').val());
    localStorage.setItem('classes', $('#addclass').val().toUpperCase());
    localStorage.setItem('notifyday', $('#notifydayflip').val());
    localStorage.setItem('notifydate', $('#notifydate').val());
});

document.addEventListener('pause', function(){
    track('event/pause');
});

document.addEventListener('resume', function(){
    track('event/resume');
});

var _paq = _paq || [];
$('#mainpage').on('pagebeforeshow', function(){
    /* Sprache setzen */
    moment.lang('de');

    /* Nutzungsstatistiken */
    _paq.push(['setTrackerUrl', 'http://klimaag.***REMOVED***/piwik/piwik.php']); // TODO Https wäre schön.
    _paq.push(['setSiteId', 5]);

    console.log('Piwik initialisiert');

    /* gespeicherte Daten laden */
    var dntrack = localStorage.getItem('dntrack');
    var additionalClasses = localStorage.getItem('classes');
    var notifyDay = localStorage.getItem('notifyday');
    var notifyDate = localStorage.getItem('notifydate');

    if(dntrack === null || dntrack.length === 0){
        dntrack = 'false';
    }
    $('#dntflip').val(dntrack).slider('refresh');

    if(additionalClasses === null || additionalClasses.length === 0){
        additionalClasses = '';
    }
    $('#addclass').val(additionalClasses).textinput('refresh');

    if(notifyDay === null || notifyDay.length === 0){
        notifyDay = 0;
    }
    $('#notifydayflip').val(notifyDay).slider('refresh');

    if(notifyDate === null || notifyDate.length === 0){
        notifyDate = '18:00';
    }
    $('#notifydate').val(notifyDate).textinput('refresh');

    /* Piwik initialisieren */
    _paq.push(['setDoNotTrack', dntrack]);
});

// Login-Popup beim Start
document.addEventListener('deviceready', function(){
    /* los geht's */
    _paq.push(['setCustomVariable', 1, 'Modell', device.model, 'visit']);
    _paq.push(['setCustomVariable', 2, 'Version', device.version, 'visit']);
    track('event/load');

    var dntrack = localStorage.getItem('dntrack');

    if(dntrack === null || dntrack.length === 0){
        setTimeout(function(){
            $('#lnkdisclaimer').click();
        }, 2000);
    }else{
        fillForm();
        load();
        tryLogin();
    }
}, false);

/* der Loader wird nur angezeigt, wenn das Popup zu ist */
$('#loginpopup').on('popupafteropen', function(){
    $.mobile.loading('hide');
});

$('#disclaimerpopup').on('popupafterclose', function(){
    fillForm();
    load();
    tryLogin();
});

/* füllt die Loginform mit gespeicherten Werten */
function fillForm(){
    var username = localStorage.getItem('username');

    if(username !== null && username.length !== 0){
        $('#username').val(username);
    }
       
    var password = localStorage.getItem('password');

    if(password !== null && password.length !== 0){
        $('#password').val(password);
    }
}

/* benachrichtigt den Benutzer an vdate mit msg */
var notifications = 0;
function addNotification(vdate, msg){
    vdate = vdate.subtract('days', 1).add('days', $('#notifydayflip').val()); // Bei Bedarf einen Tag vorher

    var secondsUntilDate = vdate.diff(moment(), 'seconds');

    if(secondsUntilDate > 0){
        localNotification.add(++notifications, {
            seconds: secondsUntilDate,
            message: msg,
            badge: 0});

        console.log('Benachrichtigung hinzugefügt: ' + vdate.format('DD.MM. hh:mm') + '; ' + msg);
    }
}

/* zeigt einen Button an, mit dem die Vertretung geteilt werden kann */
function addSocialButton(vdate, msg, $div){
    if(moment().isBefore(vdate)){
        var datestr = vdate.format('dddd');

        var btn = $('<button />')
            .text('Teile die Vertretungen')

            .click(function(){
                window.plugins.socialsharing.share('Hey Leute! Laut der WvS-VPlan-App gibt es folgende Vertretungen am ' + datestr + ': ' + msg);
                console.log('Vertretungsplan geteilt: ' + datestr);
                track('event/share');
            })
        
            .addClass('ui-btn ui-corner-all ui-btn-inline');

        $div.prepend(btn);

        console.log('Teilen-Button hinzugefügt: ' + datestr + msg);
    }
}

function checkeKlasse(nutzerklasse, klasse){
    var subklassen = nutzerklasse.match(/(\d{1,2})([ABCD])/);
    var wichtig = true;

    if(klasse.indexOf(nutzerklasse) == -1){
        if(subklassen !== null){
            for(j = 1; j < subklassen.length; j++){ // Wenn alle Buchstaben der Klasse in der Vertretung vorkommen
                if(klasse.indexOf(subklassen[j]) == -1){
                    wichtig = false;
                }
            }
        }else{
            wichtig = false;
        }
    }

    return wichtig;
}

/* konvertiert die extrahierten Strings in ein lesbares Format und filtert nach relevanten Vertretungen */
function parseVertretungen(str, username){
    var vertretungenRe = new RegExp('(\\w+)\\s+(\\d(?:\\s+-\\s+\\d)?)\\s+((?:x\\s+)?)(\\+|\\w+|---)\\s+(\\w+|---)\\s+(\\w+|---)\\s+(.*?)\\s+(\\w+)(?:\\s+)?(.*?)');
    var res;
    var vertretungen = [];

    var nutzerklasse = username.match(/(\w+)_.*/)[1].toUpperCase();

    str.split('\n').forEach(function(vertretungsstr){
        res = vertretungsstr.match(vertretungenRe);

        if(res !== null){
            var klasse = res[1];
            var stunde = res[2].replace(/ /g, '');
            var entfall = res[3].indexOf('x') > -1;
            var vertreter = res[4];
            var fach = res[5];
            var raum = res[6];
            var art = res[7];
            var lehrer = res[8];
            var info = res[9];

            var wichtig = false;
            
            if(checkeKlasse(nutzerklasse, klasse) === true){
                wichtig = true;
            }else{
                var additionalClasses = $('#addclass').val().split('\n'); // alle benutzerdefinierten Klassen durchgehen

                additionalClasses.forEach(function(addCls){
                    if(checkeKlasse(addCls, klasse) === true){
                        wichtig = true;
                    }
                });
            }

            if(wichtig === false){
                return;
            }

            if(entfall === true){
                if(art.length <= 1){
                    art = "";
                }else{
                    art = " " + art;
                }

                if(info.length <= 1){
                    info = "";
                }else{
                    info = " Info:" + info;
                }

                vertretungen.push(klasse + " " + stunde + ". Stunde Entfall statt " + lehrer + art + info);
            }else{
                if(art.length <= 1){
                    art = "";
                }else{
                    art = art + " in ";
                }

                if(info.length <= 1){
                    info = "";
                }else{
                    info = " Info:" + info;
                }

                var nlehrer;

                if(lehrer !== vertreter){
                    nlehrer = " bei " + vertreter + " (statt " + lehrer + ")";
                }

                vertretungen.push(klasse + " " + stunde + ". Stunde " + art + fach + nlehrer + " in Raum " + raum + info);
            }
        }else{
            if(vertretungsstr.indexOf('Unterrichtsschluss') > -1){
                vertretungen.push(vertretungsstr);
            }
        }
    });

    vertretungen = vertretungen.filter(function(elem, pos){ // doppelte Einträge filtern
        return vertretungen.indexOf(elem) == pos;
    });

    console.log(JSON.stringify(vertretungen));
    return vertretungen;
}

/* PDF Rendering */
function renderPage($div, pdf, pageNumber, callback){
    pdf.getPage(pageNumber).then(function(page){
        var scale = 1;
        var viewport = page.getViewport(scale);

        var pageDisplayWidth = viewport.width;
        var pageDisplayHeight = viewport.height;

        var $pageDivHolder = $('<div></div>');
        $pageDivHolder.addClass('pdfpage');
        $pageDivHolder.width($(window).width()); // TODO Rotation change
        $pageDivHolder.height($(window).height());

        var $canvas = $('<canvas></canvas>');
        var canvas = $canvas.get(0);
        canvas.className = 'pdfcanvas';
        var context = canvas.getContext('2d');
        canvas.width = pageDisplayWidth;
        canvas.height = pageDisplayHeight;

        $pageDivHolder.append(canvas);
        $div.append($pageDivHolder);

        var renderContext = {
            canvasContext: context,
            viewport: viewport
        };

        page.render(renderContext).promise.then(function(pdf){
            page.getTextContent().then(function(textContent){ // Text extrahieren
                var pageText = "";
                var lastBlock = null;
                 
                for(j = 0; j < textContent.length; j++){
                    var block = textContent[j];
                    if(lastBlock !== null && lastBlock.str[lastBlock.str.length - 1] !== ' '){
                        if(block.x < lastBlock.x){
                            pageText += '\n';
                        }else if(lastBlock.y !== block.y && (lastBlock.str.match(/^(\s?[a-zA-Z])$|^(.+\s[a-zA-Z])$/) === null )){
                            pageText += '\n';
                        }
                    }
                     
                    pageText += block.str;
                    lastBlock = block;
                }

                var username = getUserData();

                if(username === null){
                    return;
                }else{
                    username = username[0];
                }

                var vertretungen = parseVertretungen(pageText, username);

                if(vertretungen.length > 0){
                    var vdate = moment($div.data('date'), 'YYYY-MM-DD').startOf('second');
                    var time = $('#notifydate').val().split(':');

                    vdate.set('hour', time[0]);
                    vdate.set('minute', time[1]);

                    addNotification(vdate, vertretungen.join('\n'));
                    addSocialButton(vdate, vertretungen.join(', '), $div);
                }
            });

            callback(pdf);
        });
    });
}

function renderPdf(url, divstr){
    console.log('Rendere PDF: ' + url + ' (' + divstr + ')');

    PDFJS.getDocument(url).then(function(pdf){
        var $viewer = $('#' + divstr);

        var pageNumber = 1;
        renderPage($viewer, pdf, pageNumber++, function pageRenderingComplete(){
            if(pageNumber > pdf.numPages){
                $.mobile.loading('hide'); // nach dem Rendern des ersten PDFs Loader verstecken
                return;
            }
            renderPage($viewer, pdf, pageNumber++, pageRenderingComplete);
        });
    });
}

/* wird bei Verbindungsfehlern oder anderen Fehlern aufgerufen */
function fail(text){
    $('#lnklogin').click();
    $('#error_noconn').show('fast');
    console.log('Fehler: ' + text.toString() + ' / ' + text.code);
    track('error/connectiondown');
}

/* entfernt das Logintab */
function removeLoginTab(){
    $('#vplannavbar').find('*').andSelf().each(function(){
        $(this).removeClass(function(i, cn){
            var matches = cn.match(/ui-[\w\-]+/g) || [];
            return (matches.join(' '));
        });
        if($(this).attr('class') === ''){
            $(this).removeAttr('class');
        }
    });

    $('#vplannavbar').navbar('destroy');
    $('#vplannavbar ul li:first').remove();
    $('#vplannavbar').navbar();

    $('#login').remove();
    $('#vplantabs').tabs('refresh');

    var vdate = moment($('#vplantabs ul li:first').data('date'), 'YYYY-MM-DD');
    trackPlan(vdate);
}

function replaceUmlauts(umlautstr){
    tr = {'ä': 'ae', 'ü': 'ue', 'ö': 'oe', 'ß': 'ss'};

    return umlautstr.replace(/[äöüß]/g, function($0) { return tr[$0]; });
}

/* fügt die lokale URL des Plans ein und ruft die Seite zum Rendering auf */
function addPlanAttr(fileEntry, wasdownloaded){
    var sPath = fileEntry.toURL();
    var name = fileEntry.name;
    console.log('Dateiname: ' + name);

    var fnameRe = new RegExp('.*?(\\d{4}-\\d{2}-\\d{2})(.*?)\\.pdf');
    var results = name.match(fnameRe);
    var vdate = moment(results[1], 'YYYY-MM-DD').startOf('day');

    if(results[2] !== null){
        results[2] = results[2].replace(/[ ,]/g, '-').replace(/-{2}/g, '-');
    }

    name = vdate.format('DD_MM_YYYY') + replaceUmlauts(results[2]);

    if(!$(name).length){
        $('#vplannavbar').find('*').andSelf().each(function(){
            $(this).removeClass(function(i, cn){
                var matches = cn.match(/ui-[\w\-]+/g) || [];
                return (matches.join(' '));
            });
            if($(this).attr('class') === ''){
                $(this).removeAttr('class');
            }
        });

        $('#vplannavbar').navbar('destroy');
        $('#vplannavbar ul').append('<li><a href="#' + name + '">' + name.replace(/_/g, '.') + '</a></li>');
        $('#vplannavbar ul li:last').click(function(){
            trackPlan(vdate);
        });

        $('#vplannavbar').navbar();

        $('#vplantabs').append('<div id="' + name + '" class="tablist-content"></div>');
        $('#vplantabs').tabs('refresh');

        $('#' + name).data('date', results[1]);

        if($('#login').length && wasdownloaded){
            removeLoginTab();
        }
    }

    renderPdf(sPath, name);
}

/* lädt ein PDF anhand eines Links herunter, benötigt ID zur Sortierung */
function downloadPdf(link){
    var filename = link.substring(link.lastIndexOf("/") + 1);

    window.requestFileSystem(
    LocalFileSystem.PERSISTENT, 0,
    function(fileSystem){
        fileSystem.root.getDirectory('WvSVPlan', {create: true, exclusive: false},
        function(dirEntry){
            dirEntry.getFile(filename, {create: false, exclusive: false},
            function(fileEntry){
                // Datei ist schon heruntergeladen
                console.log('Datei schon heruntergeladen');

                if($('#login').length){
                    removeLoginTab();
                }
            },
        function(err){
            // Datei existiert noch nicht
            dirEntry.getFile(filename, {create: true, exclusive: false},
            function(fileEntry){
                var fileTransfer = new FileTransfer();

                fileTransfer.download(
                link,
                fileEntry.toURL(),
                function(theFile){
                    console.log('Download fertig: ' + theFile.toURL());
                    addPlanAttr(theFile, true);
                    }, fail);
                }, fail);
            });
        }, fail);
    });
}

/* sucht den Downloadlink eines Plans mithilfe eines Links aus der Kursübersicht */
function getPlan(link){
    var request = $.ajax({
        url: link
    });

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

        if(pdflink === null){
            return 0;
        }

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

        return 1;
    });

    request.fail(fail);
}


/* holt die Kursübersicht - bei Verbindungsfehlern wird onfail aufgerufen */
function getOverview(link, onfail){
    var request = $.ajax({
        url: link
    });

    console.log('Hole Übersicht');

    request.done(function gotOverview(resultHtml){
            /* ruft getPlan für jeden Link in der Kursübersicht auf */
            var plansRe = new RegExp('window\\.open\\(&#039;(http://***REMOVED***\\.de/moodle/mod/resource/view\\.php\\?id=\\d+)&amp;redirect=1&#039;\\)', 'g');

            var resultarr = resultHtml.match(plansRe);

            if(resultarr === null){
                $('#error_passwd').show('fast');
                onfail();
                return 0;
            }

            var resultl = resultarr.length;

            while((link = plansRe.exec(resultHtml)) !== null){
                console.log('suche Plan ' + link[1]);
                getPlan(link[1]);
            }

            console.log('Übersichts-Request erfolgreich');
            return 1;
        });

        request.fail(onfail);
}

/* such den Link zur Übersicht von der Startseite aus */
function loggedIn(resultHtml){
    var vertretungsRe = new RegExp('title="Vertretungsplan" href="(http://***REMOVED***\\.de/moodle/course/view\\.php\\?id=\\d+)"');
    var link = vertretungsRe.exec(resultHtml)[1];

    if(link === null){
        return 0;
    }

    localStorage.setItem('overviewlink', link);
    console.log('Eingeloggt');
    getOverview(link, fail);

    return 1;
}

/* sendet einen HTTPost-Request mit Logindaten */
function sendLogin(username, password){
    var params = 'username=' + username + '&password=' + password;

    $('#error_noconn').hide('fast');
    $('#error_passwd').hide('fast');
    
    var request = $.ajax({
        type: 'POST',
        url: 'https://***REMOVED***/moodle/login/index.php',
        data: {username: username, password: password}
    });

    console.log('Logge ein');

    request.done(loggedIn);
    request.fail(fail);
}

/* lädt Benutzerdaten 1) aus den Userinterfaces oder 2) aus dem HTML5 Local Storage */
/* oder 3) gibt null zurück */
function getUserData(){
    var username = encodeURIComponent($('#username').val());

    if(username === ''){
        username = localStorage.getItem('username');
    }else{
        localStorage.setItem('username', username);
    }

    var password = encodeURIComponent($('#password').val());
    if(password === ''){
        password = localStorage.getItem('password');
    }else{
        localStorage.setItem('password', password);
    }

    console.log('Benutzerdaten geladen');

    if(username !== null && username.length !== 0 && password !== null && password.length !== 0){
        $('#username').val(username);
        $('#password').val(password);

        return [username, password];
    }else{
        return null;
    }
}

/* loggt ein oder zeigt Loginform */
function login(){
    $.mobile.loading('show', {theme: 'a'});
    userdata = getUserData();

    if(userdata){
        sendLogin(userdata[0], userdata[1]);
        $('#loginpopup').popup('close');
        return 1;
    }else{
        $('#lnklogin').click();
        return 0;
    }
}

/* versucht ohne HTTPost die Übersicht zu holen */
/* bei einem Fehlschlag wird in login() versucht, die Nutzerdaten zu laden */
/* und wenn das schiefläuft, muss der Nutzer seine Daten selbst eingeben */
function tryLogin(){
    var link = localStorage.getItem('overviewlink');

    $('#loginpopup').popup('close');

    if(link !== null && link.length !== 0){
        console.log('Teste Login');
        console.log(link);

        getOverview(link, login);
    }else{
        login();
    }
}

/* gibt aktuelle Pläne aus entries zurück */
function getActual(entries){
    var fnameRe = new RegExp('.*?(\\d{4}-\\d{2}-\\d{2}).*?\\.pdf');
    var today = moment().startOf('day');
    var actual = [];

    entries.forEach(function(entry){
        console.log(entry.name);
        var results = entry.name.match(fnameRe);
        var fdate = moment(results[1], 'YYYY-MM-DD');

        if(today.isBefore(fdate)){
            actual.push(entry);
        }
    });

    return actual;
}

/* lädt Vertretungspläne aus dem Speicher [1) SD-Karte oder 2) dem internen Speicher] */
function load(){
    $.mobile.loading('show', {theme: 'a'});
    window.requestFileSystem(
    LocalFileSystem.PERSISTENT, 0,
    function(fileSystem){
        fileSystem.root.getDirectory('WvSVPlan', {create: true, exclusive: false},
        function(dirEntry){
            var dirReader = dirEntry.createReader();

            dirReader.readEntries(
            function(entries){
                var actual = getActual(entries);

                console.log('Im Speicher: ' + actual.length + ' Pläne');

                if(actual.length > 0){
                    $('#noplans').hide('slow');
                    for(j = 0; j < actual.length; j++){
                        addPlanAttr(actual[j], false);
                    }
                }else{
                    $('#noplans').show('fast');
                    $('#lnklogin').show('fast');
                }
            }, fail);
        }, fail);
    });
}