/*
 * 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 <functional>
#include <QUrl>
#include <QDebug>
#include <QJsonDocument>
#include <QJsonObject>
#include <QQmlContext>
#include <QtQml/QQmlApplicationEngine>
#include <cstring>
#include <QFileInfo>

#include "eventhandler.h"

const char _parameter[] = "parameter";
const char _replyto[] = "replyto";
const char _data[] = "data";
const char _file[] = "file";
const char _area[] = "area";
const char _suffix[] = ".qml";
const char _button_name[] = "buttonName";
const char _button_press_mode[] = "buttonPressMode";
const char _button_press_state[] = "buttonPressState";
const char _drawing_name[] = "drawing_name";
const char _application_id[] = "application_id";
const char _onscreen_directory[] = "/usr/lib/qt5/qml/AGL/OnScreen/";

void* EventHandler::myThis = 0;

EventHandler::EventHandler(QObject *parent) :
    QObject(parent),
    mp_hs(nullptr),
    mp_wm(nullptr)
{
    m_dspreq = QString("");
    m_req.clear();
}

EventHandler::~EventHandler()
{
    if (mp_hs != nullptr) {
        delete mp_hs;
    }
    if (mp_wm != nullptr) {
        delete mp_wm;
    }
}

void EventHandler::init(int port, const char *token)
{
    myThis = this;
    mp_wm = new QLibWindowmanager();
    mp_wm->init(port, token);

    mp_hs = new LibHomeScreen();
    mp_hs->init(port, token);
    
    mp_hs->registerCallback(nullptr, EventHandler::onRep_static);
    mp_hs->set_event_handler(LibHomeScreen::Event_ShowWindow, [this](json_object *object){
        // {"id": "onscreenXXX", "parameter": {"file": "onsreen file path", "data": {"key": "value", ...}}, "replyto": "app's id"}
        HMI_DEBUG(APP_ID, "recived json message is[%s]", json_object_get_string(object));

        struct json_object *param;
        json_object_object_get_ex(object, _parameter, &param);
        if(json_object_get_type(param) != json_type_object ) {
            HMI_DEBUG(APP_ID, "parameter error!");
            return;
        }

        struct json_object *qml_path;
        const char *file = nullptr;
        if(json_object_object_get_ex(param, _file, &qml_path))
            file = json_object_get_string(qml_path);
        if(file == nullptr) {
            HMI_DEBUG(APP_ID, "received qml file is null!");
            return;
        }

        QString qml_file = QString(_onscreen_directory) + file;
        QFileInfo file_info(qml_file);
        if(!file_info.isFile() || !qml_file.contains(QString(_suffix), Qt::CaseSensitive)) {
            HMI_DEBUG(APP_ID, "received qml file error! file=%s.", file);
            return;
        }

        struct json_object *replyid;
        const char *replyto = nullptr;
        if(json_object_object_get_ex(param, _replyto, &replyid))
            replyto = json_object_get_string(replyid);
        if(replyto == nullptr) {
            HMI_DEBUG(APP_ID, "received replyto is null!");
            return;
        }

        struct json_object *display_area;
        const char *area = nullptr;
        if(json_object_object_get_ex(param, _area, &display_area))
            area = json_object_get_string(display_area);

        struct json_object *param_data;
        const char* data = nullptr;
        if(json_object_object_get_ex(param, _data, &param_data))
            data = json_object_to_json_string(param_data);

        m_dspreq = QString(replyto);
        if(m_req.contains(m_dspreq)) {
            m_req[m_dspreq] = qMakePair(qml_file, QString(data));
        }
        else
            m_req.insert(QString(m_dspreq), qMakePair(qml_file, QString(data)));

        if(area == nullptr)
            this->activateWindow(ROLE_NAME);
        else
            this->activateWindow(ROLE_NAME, area);

        HMI_DEBUG(APP_ID, "received showWindow event, end!, line=%d", __LINE__);
    });

    mp_hs->set_event_handler(LibHomeScreen::Event_HideWindow, [this](json_object *object){
        struct json_object *value;
        json_object_object_get_ex(object, _application_id, &value);
        const char *appid = json_object_get_string(value);
        HMI_DEBUG(APP_ID, "request release onScreen application is %s!", appid);

        // onscreenapp only can release by application which request show
        if (appid == m_dspreq)
            this->deactivateWindow();
        else
            HMI_DEBUG(APP_ID, "request hideWindow application isn't request displaying application, m_dspreq=%s", m_dspreq.toStdString().c_str());
    });

    if (mp_wm->requestSurface(ROLE_NAME) != 0) {
        HMI_DEBUG(APP_ID, "!!!!LayoutHandler requestSurface Failed!!!!!");
        exit(EXIT_FAILURE);
    }

    mp_wm->set_event_handler(QLibWindowmanager::Event_SyncDraw, [this](json_object *object) {
        HMI_DEBUG(APP_ID, "Surface %s got syncDraw!", ROLE_NAME);
        emit this->signalLoader(QVariant("file://" + m_req[m_dspreq].first));
        emit this->signalOnScreenParameter(QVariant(m_req[m_dspreq].second));
        this->mp_wm->endDraw(QString(ROLE_NAME));
    });

    mp_wm->set_event_handler(QLibWindowmanager::Event_Visible, [this](json_object *object) {
        struct json_object *value;
        json_object_object_get_ex(object, _drawing_name, &value);
        const char *name = json_object_get_string(value);

        HMI_DEBUG(APP_ID, "Event_Visible kKeyDrawingName = %s", name);
    });

    mp_wm->set_event_handler(QLibWindowmanager::Event_Invisible, [this](json_object *object) {
        struct json_object *value;
        json_object_object_get_ex(object, _drawing_name, &value);
        const char *name = json_object_get_string(value);

        HMI_DEBUG(APP_ID, "Event_Invisible kKeyDrawingName = %s", name);
    });

    HMI_DEBUG(APP_ID, "LayoutHander::init() finished.");
}

void EventHandler::onRep_static(struct json_object* reply_contents)
{
    static_cast<EventHandler*>(EventHandler::myThis)->onRep(reply_contents);
}

void EventHandler::onRep(struct json_object* reply_contents)
{
    const char* str = json_object_to_json_string(reply_contents);
    HMI_DEBUG(APP_ID, "EventHandler::onReply %s", str);
}

void EventHandler::activateWindow(const char *role, const char *area)
{
    HMI_DEBUG(APP_ID, "EventHandler::activateWindow()");
    mp_wm->activateWindow(role, area);
}

void EventHandler::deactivateWindow()
{
    HMI_DEBUG(APP_ID, "EventHandler::deactivateWindow()");

    emit this->signalLoader(QVariant(""));
    mp_wm->deactivateWindow(ROLE_NAME);
}

void EventHandler::onScreenReply(const QString &btn_name, const QString &press_mode, const QString &press_state)
{
    HMI_DEBUG(APP_ID, "EventHandler::onScreenReply()");
//    deactivateWindow();

    struct json_object* j_obj = json_object_new_object();
    json_object_object_add(j_obj, _application_id, json_object_new_string(m_dspreq.toLatin1()));

    struct json_object* j_param = json_object_new_object();
    json_object_object_add(j_param, _button_name, json_object_new_string(btn_name.toStdString().c_str()));
    json_object_object_add(j_param, _button_press_mode, json_object_new_string(press_mode.toStdString().c_str()));
    json_object_object_add(j_param, _button_press_state, json_object_new_string(press_state.toStdString().c_str()));
    json_object_object_add(j_obj, _parameter, j_param);

    mp_hs->replyShowWindow(m_dspreq.toLatin1(), j_obj);
}