/*
 * Copyright (c) 2019 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 <QGuiApplication>
#include <QJsonDocument>
#include <QJsonObject>
#include <QQmlContext>
#include <QtQml/QQmlApplicationEngine>
#include <cstring>
#include <QFileInfo>
#include <qpa/qplatformnativeinterface.h>

#include "eventhandler.h"

const char _myrole[] = "on_screen";
const char _parameter[] = "parameter";
const char _replyto[] = "replyto";
const char _onscreen_title[] = "onscreenTitle";
const char _button_name[] = "buttonName";
const char _drawing_name[] = "drawing_name";
const char _application_id[] = "application_id";


void* EventHandler::myThis = 0;

static struct wl_output *
getWlOutput(QScreen *screen)
{
	QPlatformNativeInterface *native = qApp->platformNativeInterface();
	void *output = native->nativeResourceForScreen("output", screen);
	return static_cast<struct ::wl_output*>(output);
}

static void
global_add(void *data, struct wl_registry *reg, uint32_t name,
	   const char *interface, uint32_t version)
{
	struct agl_shell_desktop **shell =
		static_cast<struct agl_shell_desktop **>(data);

	if (strcmp(interface, agl_shell_desktop_interface.name) == 0) {
		*shell = static_cast<struct agl_shell_desktop *>(
			wl_registry_bind(reg, name, &agl_shell_desktop_interface, version)
		);
	}
}

static void global_remove(void *data, struct wl_registry *reg, uint32_t id)
{
	(void) data;
	(void) reg;
	(void) id;
}

static const struct wl_registry_listener registry_listener = {
	global_add,
	global_remove,
};

static void
application_id_event(void *data, struct agl_shell_desktop *agl_shell_desktop,
		const char *app_id)
{
	EventHandler *ev_handler = static_cast<EventHandler *>(data);
	(void) agl_shell_desktop;

	// should probably add here to a list the application or trigger emit
	// for QML code, also note that we get here our own application
	if (strcmp(app_id, APP_ID) == 0)
		return;

	qInfo() << "app_id: " << app_id;
}

static void
application_state_event(void *data, struct agl_shell_desktop *agl_shell_desktop,
			const char *app_id, const char *app_data,
			uint32_t app_state, uint32_t app_role)
{
	EventHandler *ev_handler = static_cast<EventHandler *>(data);
	(void) agl_shell_desktop;

	qInfo() << "got application_state_event() for app_id=" <<
		app_id << ", state=" << app_state << ", role=" << app_role;

	if (strcmp(app_id, APP_ID))
		return;

	if (app_state != AGL_SHELL_DESKTOP_APP_STATE_ACTIVATED)
		return;

	if (app_role != AGL_SHELL_DESKTOP_APP_ROLE_POPUP)
		return;

	qInfo() << "Got message " << app_data;

	// should signal that we got the message
	emit ev_handler->updateModel(QVariant(app_data));
	emit ev_handler->showOnScreen();
}

static const struct agl_shell_desktop_listener agl_shell_desk_listener = {
	application_id_event,
	application_state_event,
};

static struct agl_shell_desktop *
register_agl_shell_desktop(void)
{
	struct wl_display *wl;
	struct wl_registry *registry;
	struct agl_shell_desktop *shell = nullptr;

	QPlatformNativeInterface *native = qApp->platformNativeInterface();

	wl = static_cast<struct wl_display *>(native->nativeResourceForIntegration("display"));
	registry = wl_display_get_registry(wl);

	wl_registry_add_listener(registry, &registry_listener, &shell);
	// Roundtrip to get all globals advertised by the compositor
	wl_display_roundtrip(wl);
	wl_registry_destroy(registry);

	return shell;
}


EventHandler::EventHandler(QObject *parent) :
    QObject(parent),
    m_dsp_sts(false)
{
}

EventHandler::~EventHandler()
{
    if (shell_desktop)
	    agl_shell_desktop_destroy(shell_desktop);
}

void EventHandler::init(int port, const char *token)
{
	(void) port;
	(void) token;

	shell_desktop = register_agl_shell_desktop();
	if (shell_desktop)
		agl_shell_desktop_add_listener(shell_desktop, &agl_shell_desk_listener, this);
#if 0
    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){
        /*
        {
            "application_id": "onscreenapp",
            "parameter": {
                "title": "onscreen title",
                "type": "critical,exclamation,question,information",
                "contents": "message contents",
                "buttons": ["button_name1", "button_name2", "button_name3"],
                "replyto":"caller application id"
            }
        } */
        HMI_DEBUG(APP_ID, "recived json message is[%s]", json_object_get_string(object));

        struct json_object *param;
        if(!json_object_object_get_ex(object, _parameter, &param)
        || json_object_get_type(param) != json_type_object) {
            HMI_DEBUG(APP_ID, "parameter error!");
            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;
        }
        m_req = qMakePair(QString(replyto), QString(json_object_to_json_string(param)));

        if (this->getDisplayStatus() == HIDING) {
            this->activateWindow(_myrole, "on_screen");
        }
        else if(this->getDisplayStatus() == SHOWING) {
            this->setDisplayStatus(SWAPPING);
            emit this->hideOnScreen();
        }
        else {
            HMI_DEBUG(APP_ID, "onscreen swapping!");
        }
        HMI_DEBUG(APP_ID, "received showWindow event, end!, line=%d", __LINE__);
    });

    mp_hs->set_event_handler(LibHomeScreen::Event_HideWindow, [this](json_object *object){
        emit this->hideOnScreen();
        HMI_DEBUG(APP_ID, "hideWindow json_object=%s", json_object_get_string(object));
    });

    if (mp_wm->requestSurface(_myrole) != 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!", _myrole);
        this->mp_wm->endDraw(QString(_myrole));
    });

    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);
        if(!strcasecmp(_myrole, name)){
            this->setDisplayStatus(SHOWING);
            this->m_dsp = this->m_req;
            this->updateModel(QVariant(this->m_dsp.second));
            emit this->showOnScreen();
        }

        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.");
#endif
}

#if 0
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);
}
#endif

void EventHandler::activateWindow(const char *role, const char *area)
{
#if 0
    HMI_DEBUG(APP_ID, "EventHandler::activateWindow()");
    mp_wm->activateWindow(role, area);
#endif
	fprintf(stderr, "EventHandler::activateWindow() role %s, area %s\n",
			role, area);
}

void EventHandler::deactivateWindow()
{
#if 0
    HMI_DEBUG(APP_ID, "EventHandler::deactivateWindow()");
    if(getDisplayStatus() == SWAPPING) {
        setDisplayStatus(SHOWING);
        m_dsp = m_req;
        updateModel(QVariant(this->m_dsp.second));
        emit showOnScreen();
    }
    else {
        this->setDisplayStatus(HIDING);
        mp_wm->deactivateWindow(_myrole);
    }
#endif
	int display_status = getDisplayStatus();
	fprintf(stderr, "EventHandler::deactivateWindow(), "
			"display_status %d\n", display_status);

	if (shell_desktop) {
		agl_shell_desktop_deactivate_app(shell_desktop, APP_ID);
	}
}

void EventHandler::onScreenReply(const QString &ons_title, const QString &btn_name)
{
    fprintf(stderr, "ons_title=%s btn_name=%s\n", ons_title.toStdString().c_str(), btn_name.toStdString().c_str());
    emit this->hideOnScreen();

#if 0
    struct json_object* j_param = json_object_new_object();
    json_object_object_add(j_param, _onscreen_title, json_object_new_string(ons_title.toStdString().c_str()));
    json_object_object_add(j_param, _button_name, json_object_new_string(btn_name.toStdString().c_str()));
    mp_hs->replyShowWindow(m_dsp.first.toStdString().c_str(), j_param);
#endif
    fprintf(stderr, "EventHandler::onScreenReply with ons_title %s, btn_name %s\n",
		    ons_title.toStdString().c_str(), btn_name.toStdString().c_str());
}