/*  _____ _
 * |_   _| |_  _ _ ___ ___ _ __  __ _
 *   | | | ' \| '_/ -_) -_) '  \/ _` |_
 *   |_| |_||_|_| \___\___|_|_|_\__,_(_)
 *
 * Threema for Android
 * Copyright (c) 2016-2020 Threema GmbH
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <https://www.gnu.org/licenses/>.
 */

package ch.threema.app.webclient.services.instance.message.receiver;

import android.content.Context;

import androidx.annotation.AnyThread;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.annotation.WorkerThread;

import org.msgpack.core.MessagePackException;
import org.msgpack.value.Value;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Map;

import ch.threema.app.services.PreferenceService;
import ch.threema.app.webclient.Protocol;
import ch.threema.app.webclient.converter.ClientInfo;
import ch.threema.app.webclient.converter.MsgpackObjectBuilder;
import ch.threema.app.webclient.exceptions.ConversionException;
import ch.threema.app.webclient.services.instance.MessageDispatcher;
import ch.threema.app.webclient.services.instance.MessageReceiver;

/**
 * Webclient sending all client information.
 */
@WorkerThread
public class ClientInfoRequestHandler extends MessageReceiver {
	private static final Logger logger = LoggerFactory.getLogger(ClientInfoRequestHandler.class);

	private final MessageDispatcher dispatcher;
	private final PreferenceService preferenceService;
	private final Context appContext;
	private final Listener listener;

	@WorkerThread
	public interface Listener {
		void onReceived(@NonNull String userAgent);
		void onAnswered(@Nullable String pushToken);
	}

	@AnyThread
	public ClientInfoRequestHandler(MessageDispatcher dispatcher,
	                                PreferenceService preferenceService,
	                                Context appContext,
	                                Listener listener) {
		super(Protocol.SUB_TYPE_CLIENT_INFO);
		this.dispatcher = dispatcher;
		this.preferenceService = preferenceService;
		this.appContext = appContext;
		this.listener = listener;
	}

	@Override
	protected void receive(Map<String, Value> message) throws MessagePackException {
		logger.info("Received client information request");
		Map<String, Value> data = this.getData(message, false, new String[] {
			Protocol.ARGUMENT_USER_AGENT,
			Protocol.ARGUMENT_BROWSER_NAME,
			Protocol.ARGUMENT_BROWSER_VERSION,
		});

		if (this.listener != null) {
			// TODO: Store detected browser!
			final String userAgent = data.get(Protocol.ARGUMENT_USER_AGENT).asStringValue().asString();
			this.listener.onReceived(userAgent);
		}

		this.respond();
	}

	private void respond() {
		// Get the "current" Push Token from application
		final String currentPushToken = this.preferenceService.getPushToken();
		if (currentPushToken == null || currentPushToken.isEmpty()) {
			logger.warn("Warning: Push token is null or empty");
		}
		try {
			final MsgpackObjectBuilder data = ClientInfo.convert(this.appContext, currentPushToken);
			this.send(this.dispatcher, data, null);
			if (this.listener != null) {
				this.listener.onAnswered(currentPushToken);
			}
		} catch (ConversionException e) {
			logger.error("Could not convert ClientInfo", e);
		}
	}

	@Override
	protected boolean maybeNeedsConnection() {
		return false;
	}
}
