/*
 * 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 <QGuiApplication>
#include <QJsonDocument>
#include <QJsonObject>
#include <QQuickWindow>
#include <QtQml/QQmlContext>
#include <QQmlContext>
#include <QtQml/QQmlApplicationEngine>
#include <qpa/qplatformnativeinterface.h>

#include "eventhandler.h"

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;

	if (strcmp(app_id, "onescreenapp") == 0)
		emit ev_handler->signalOnReplyShowWindow(app_id);
}

static const struct agl_shell_desktop_listener agl_shell_desk_listener = {
	application_id_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;
}


void* EventHandler::myThis = 0;

const char _drawing_name[] = "drawing_name";

EventHandler::EventHandler(QObject *parent) :
    QObject(parent), mp_qw(NULL)
{

}

EventHandler::~EventHandler()
{
#if 0
    if (mp_hs != NULL) {
        delete mp_hs;
    }
    if (mp_wm != NULL) {
        delete mp_wm;
    }
#endif
    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 QLibHomeScreen();
    mp_hs->init(port, token);

    mp_hs->set_event_handler(QLibHomeScreen::Event_ShowWindow, [this](json_object *object){
        this->mp_wm->activateWindow(ROLE_NAME, "normal");
        HMI_DEBUG(APP_ID, "received showWindow event, end!, line=%d", __LINE__);
    });

    mp_hs->set_event_handler(QLibHomeScreen::Event_ReplyShowWindow, [this](json_object *object){
        HMI_DEBUG(APP_ID, "got Event_ReplyShowWindow!\n");
        const char* msg = json_object_to_json_string(object);
        emit this->signalOnReplyShowWindow(msg);
    });

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

    // Create an event callback against an event type. Here a lambda is called when SyncDraw event occurs
    mp_wm->set_event_handler(QLibWindowmanager::Event_SyncDraw, [this](json_object *object) {
        HMI_DEBUG(APP_ID, "Surface got syncDraw!");
        this->mp_wm->endDraw(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_Active 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_Inactive kKeyDrawingName = %s", name);
    });

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

void EventHandler::setQuickWindow(QQuickWindow *qw)
{
    mp_qw = qw;
    //QObject::connect(mp_qw, SIGNAL(frameSwapped()), mp_wm, SLOT(slotActivateSurface()));
}

void EventHandler::showWindow(QString id, QString json)
{
	if (shell_desktop) {
		struct wl_output *output = getWlOutput(qApp->screens().first());
		agl_shell_desktop_activate_app(shell_desktop, id.toStdString().c_str(), output);
	}

	qInfo() << "data from json: " << json.toStdString().c_str();
#if 0
    if(json.isNull())
        mp_hs->tapShortcut(id);
    else
        mp_hs->showWindow(id.toStdString().c_str(), json_tokener_parse(json.toStdString().c_str()));
#endif
}

void EventHandler::hideWindow(QString id)
{
	if (shell_desktop)
		agl_shell_desktop_deactivate_app(shell_desktop, id.toStdString().c_str());
#if 0
    mp_hs->hideWindow(id.toStdString().c_str());
#endif
}