/*
 * Copyright (C) 2016 The Qt Company Ltd.
 * Copyright (C) 2017 Toyota Motor Corporation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <QtCore/QCommandLineParser>
#include <QtCore/QDebug>
#include <QtCore/QDir>
#include <QtCore/QStandardPaths>
#include <QtCore/QUrlQuery>
#include <QtGui/QGuiApplication>
#include <QtQml/QQmlApplicationEngine>
#include <QtQml/QQmlContext>
#include <QtQml/qqml.h>
#include <QtQuickControls2/QQuickStyle>
#include "libsmwrapper.h"

#ifdef HAVE_LIBHOMESCREEN
#include <libhomescreen.hpp>
#endif

#include "playlistwithmetadata.h"

LibSMWrapper* smw;
static int mysourceID = 0;
static bool firsttime = true;
QObject *root;

static void onRep(struct json_object* reply_contents);
static void onEv(const std::string& event, struct json_object* event_contents);

int main(int argc, char *argv[])
{
#ifdef HAVE_LIBHOMESCREEN
    LibHomeScreen libHomeScreen;

    if (!libHomeScreen.renderAppToAreaAllowed(0, 1)) {
        qWarning() << "renderAppToAreaAllowed is denied";
        return -1;
    }
#endif

    QGuiApplication app(argc, argv);

    QQuickStyle::setStyle("AGL");

    qmlRegisterType<PlaylistWithMetadata>("MediaPlayer", 1, 0, "PlaylistWithMetadata");

    QQmlApplicationEngine engine;
    QQmlContext *context = engine.rootContext();

    QCommandLineParser parser;
    parser.addPositionalArgument("port", app.translate("main", "port for binding"));
    parser.addPositionalArgument("secret", app.translate("main", "secret for binding"));
    parser.addHelpOption();
    parser.addVersionOption();
    parser.process(app);
    QStringList positionalArguments = parser.positionalArguments();

    if (positionalArguments.length() == 2) {
        int port = positionalArguments.takeFirst().toInt();
        QString secret = positionalArguments.takeFirst();
        QUrl bindingAddress;
        bindingAddress.setScheme(QStringLiteral("ws"));
        bindingAddress.setHost(QStringLiteral("localhost"));
        bindingAddress.setPort(port);
        bindingAddress.setPath(QStringLiteral("/api"));
        QUrlQuery query;
        query.addQueryItem(QStringLiteral("token"), secret);
        bindingAddress.setQuery(query);
        context->setContextProperty(QStringLiteral("bindingAddress"), bindingAddress);

        // prepare to use soundmangaer
        smw = new LibSMWrapper(port, secret);
        smw->wrapper_registerCallback(onEv, onRep);
        smw->subscribe(QString("asyncSetSourceState"));
        smw->subscribe(QString("asyncConnect"));
        smw->run_eventloop();
        engine.rootContext()->setContextProperty("smw",smw);
    }

    engine.load(QUrl(QStringLiteral("qrc:/MediaPlayer.qml")));

    root = engine.rootObjects().first();
    QObject::connect(smw, SIGNAL(smEvent(QVariant, QVariant)),
        root, SLOT(slotEvent(QVariant, QVariant)));
    QObject::connect(smw, SIGNAL(smReply(QVariant)),
        root, SLOT(slotReply(QVariant)));
        
    return app.exec();
}

static void onRep(struct json_object* reply_contents)
{
    qDebug("%s is called", __FUNCTION__);
    QString str = QString(json_object_get_string(reply_contents));
    QJsonParseError error;
    QJsonDocument jdoc = QJsonDocument::fromJson(str.toUtf8(), &error);
    QJsonObject jobj = jdoc.object();

    smw->emit_reply(jobj);
    json_object_put(reply_contents);
}

static void onEv(const std::string& event, struct json_object* event_contents)
{
    qDebug("%s is called", __FUNCTION__);    
    QString str = QString(json_object_get_string(event_contents));
    const QString event_name = QString(event.c_str());

    if(firsttime){
        qDebug("check to return acknowledge to SM");
        if(!event_name.contains("asyncSetSourceState", Qt::CaseSensitive)){
            return;
        }
        /* this is temporary fix because QML doesn't catch signal if application is on background first*/
        qDebug("return acknowledge to SM");
        struct json_object *content_data, *content_handle, *content_sourceID;
        qDebug() << str;
        json_object_object_get_ex(event_contents,"data", &content_data);
        json_bool has_handle    = json_object_object_get_ex(content_data,"handle",&content_handle);
        json_bool has_sourceID  = json_object_object_get_ex(content_data,"sourceID",&content_sourceID);
        if(!has_handle || !has_sourceID){
            qDebug("doesn't have sourceID/handle");
            return;
        }

        int event_sourceID = json_object_get_int(content_sourceID);
        /* QML has sourceID */
        mysourceID = root->property("sourceID").toInt();
        qDebug("my sourceID is %d", mysourceID);

        if(event_sourceID != mysourceID){
            qDebug("sourceID is not designated to me");
            return;
        }

        /* Following code is mediaplayer only because mediaplayer doen't react in background first if it is on background*/
        struct json_object* ret_obj = json_object_new_object();
        json_object_object_add(ret_obj, "handle", content_handle);
        json_object_object_add(ret_obj, "error", json_object_new_int(0));
        QString ret = QString(json_object_get_string(ret_obj));
        smw->call(QString("ackSetSourceState"), ret);
        /* to here */
        firsttime = false;
    }
    
    QJsonParseError error;
    QJsonDocument jdoc = QJsonDocument::fromJson(str.toUtf8(), &error);
    const QJsonObject jobj = jdoc.object();
    smw->emit_event(event_name, jobj);

    json_object_put(event_contents);
}