/*
 * 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;
}

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)
{
	/* unused */
	(void) data;
	(void) app_id;
	(void) app_data;
	(void) app_role;
	(void) app_state;
	(void) agl_shell_desktop;
}

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;
}


void* EventHandler::myThis = 0;

const char _drawing_name[] = "drawing_name";

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

}

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);


	m_launcher = new Launcher(DEFAULT_AFM_UNIX_SOCK, nullptr);
	if (m_launcher->setup_pws_connection() != 0)
		HMI_DEBUG("onscreen", "EventHandler::init failed to set-up connection to afm-system-daemon");
}

void EventHandler::setQuickWindow(QQuickWindow *qw)
{
    mp_qw = qw;
}

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

	qInfo() << "data from json: " << json.toStdString().c_str();
}

void EventHandler::hideWindow(QString id)
{
	if (shell_desktop)
		agl_shell_desktop_deactivate_app(shell_desktop, id.toStdString().c_str());
}

int
EventHandler::start(const QString &app_id)
{
	int pid = -1;

	if (m_launcher && m_launcher->connection_is_set())
		pid = m_launcher->start(app_id);

	return pid;
}

bool
EventHandler::is_running(const QString &app_id)
{
	if (m_launcher && m_launcher->connection_is_set())
		return m_launcher->is_running(app_id);

	return false;
}

void
EventHandler::set_window_popup(const QString &app_id, int x, int y)
{
	struct wl_output *output = getWlOutput(qApp->screens().first());

	if (shell_desktop)
		agl_shell_desktop_set_app_property(shell_desktop,
				app_id.toStdString().c_str(),
				AGL_SHELL_DESKTOP_APP_ROLE_POPUP, x, y, output);
}