/*
 * Copyright (C) 2017 Konsulko Group
 *
 * 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 "message.h"
#include "messageengine.h"
#include "bluetoothmessage.h"
#include "guimetadatamessage.h"
#include "mapmessage.h"
#include "mediaplayermessage.h"
#include "navigationmessage.h"
#include "networkmessage.h"
#include "pbapmessage.h"
#include "radiomessage.h"
#include "responsemessage.h"
#include "signalcomposermessage.h"
#include "telephonymessage.h"
#include "weathermessage.h"
#include "voicemessage.h"

#include <QJsonArray>

MessageEngine::MessageEngine(const QUrl &url, QObject *parent) :
	QObject(parent),
	m_callid(0),
	m_url(url)
{
	connect(&m_websocket, &QWebSocket::connected, this, &MessageEngine::onConnected);
	connect(&m_websocket, &QWebSocket::disconnected, this, &MessageEngine::onDisconnected);

	m_websocket.open(url);
}

unsigned int MessageEngine::requestCallId()
{
	int callid;

	m_mutex.lock();
	callid = ++m_callid;
	m_mutex.unlock();

	return callid;
}

bool MessageEngine::sendMessage(Message *message)
{
	if (!message->isValid())
		return false;

	auto callid = requestCallId();
	message->setCallId(callid);

	QByteArray data = message->toJson().data();
	qint64 size = m_websocket.sendTextMessage(data);
	if (size == 0)
		return false;

	m_calls.insert(callid, data);

	return true;
}

void MessageEngine::onConnected()
{
	connect(&m_websocket, &QWebSocket::textMessageReceived, this, &MessageEngine::onTextMessageReceived);
	emit connected();
}

void MessageEngine::onDisconnected()
{
	disconnect(&m_websocket, &QWebSocket::textMessageReceived, this, &MessageEngine::onTextMessageReceived);
	emit disconnected();
}

void MessageEngine::onTextMessageReceived(QString jsonStr)
{
	jsonStr = jsonStr.simplified();
	QJsonDocument jdoc(QJsonDocument::fromJson(jsonStr.toUtf8()));
	if (jdoc.isEmpty()) {
		qWarning() << "Received invalid JSON: empty appfw message";
		return;
	}

	QJsonArray msg = jdoc.array();
	int msgid = msg[0].toInt();

	Message *message;
	MessageType type;

	switch (msgid) {
	case RetOk:
	case RetErr: {
		auto callid = msg[1].toString().toInt();
		message = new ResponseMessage(m_calls[callid]);
		type = ResponseRequestMessage;
		m_calls.remove(callid);
		break;
	}
	case Event: {
		QStringList api_str_list = msg[1].toString().split(QRegExp("/"));
		QString api = api_str_list[0].toLower();

		// FIXME: This should be rewritten using a factory class with a
		// parser parameter to remove API specific handling here
		if (api == "bluetooth-manager") {
			message = new BluetoothMessage;
			type = BluetoothEventMessage;
		} else if (api == "bluetooth-pbap") {
			message = new PbapMessage;
			type = PbapEventMessage;
		} else if (api == "telephony") {
			message = new TelephonyMessage;
			type = TelephonyEventMessage;
		} else if (api == "weather") {
			message = new WeatherMessage;
			type = WeatherEventMessage;
		} else if (api == "mediaplayer") {
			message = new MediaplayerMessage;
			type = MediaplayerEventMessage;
		} else if (api == "navigation") {
			message = new NavigationMessage;
			type = NavigationEventMessage;
		} else if (api == "network-manager") {
			message = new NetworkMessage;
			type = NetworkEventMessage;
		} else if (api == "radio") {
			message = new RadioMessage;
			type = RadioEventMessage;
		} else if (api == "bluetooth-map") {
			message = new MapMessage;
			type = MapEventMessage;
		} else if (api == "vshl-core" ) {
			message = new VoiceMessage;
			type = VoiceEventMessage;
		} else if (api == "vshl-capabilities" ) {
			// NOTE: Will need to look at event name to differentiate
			//       capabilities if more support (e.g. navigation or
			//       local media control) is added.
			message = new GuiMetadataCapabilityMessage;
			type = GuiMetadataCapabilityEventMessage;
		} else if (api == "signal-composer") {
			message = new SignalComposerMessage;
			type = SignalComposerEventMessage;
		} else {
			message = new Message;
			type = GenericMessage;
		}
		break;
	}
	default:
		break;
	}

	if (message->fromJDoc(jdoc) == false) {
		delete message;
		return;
	}

	emit messageReceived(type, message);
}