/*
 * Copyright (C) 2015 The Android Open Source Project
 *
 * 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.
 */

package android.support.car;

import android.content.ComponentName;
import android.content.Context;
import android.content.ServiceConnection;
import android.os.Handler;
import android.os.IBinder;
import android.os.Looper;
import android.os.Message;
import android.support.car.content.pm.CarPackageManagerEmbedded;
import android.support.car.hardware.CarSensorManagerEmbedded;
import android.support.car.media.CarAudioManagerEmbedded;
import android.support.car.navigation.CarNavigationManagerEmbedded;

import java.util.LinkedList;

/**
 * Default CarServiceLoader for system with built-in car service (=embedded).
 * @hide
 */
public class CarServiceLoaderEmbedded extends CarServiceLoader {

    private final ServiceConnection mServiceConnection = new ServiceConnection() {

        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            getConnectionListener().onServiceConnected(name);
        }

        @Override
        public void onServiceDisconnected(ComponentName name) {
            getConnectionListener().onServiceDisconnected(name);
        }
    };

    private final android.car.Car mCar;
    private final LinkedList<CarConnectionListener> mCarConnectionListeners =
            new LinkedList<>();
    private final CallbackHandler mHandler;

    public CarServiceLoaderEmbedded(Context context, ServiceConnectionListener listener,
            Looper looper) {
        super(context, listener, looper);
        mCar = android.car.Car.createCar(context, mServiceConnection, looper);
        mHandler = new CallbackHandler(looper);
    }

    @Override
    public void connect() throws IllegalStateException {
        mCar.connect();
    }

    @Override
    public void disconnect() {
        mCar.disconnect();
    }

    @Override
    public boolean isConnectedToCar() {
        // for embedded, connected to service means connected to car.
        return mCar.isConnected();
    }

    @Override
    public int getCarConnectionType() throws CarNotConnectedException {
        return mCar.getCarConnectionType();
    }

    @Override
    public void registerCarConnectionListener(final CarConnectionListener listener)
            throws CarNotConnectedException {
        synchronized (this) {
            mCarConnectionListeners.add(listener);
        }
        // car service connection is checked when this is called. So just dispatch it.
        mHandler.dispatchCarConnectionCall(listener, getCarConnectionType());
    }

    @Override
    public void unregisterCarConnectionListener(CarConnectionListener listener) {
        synchronized (this) {
            mCarConnectionListeners.remove(listener);
        }
    }

    @Override
    public Object getCarManager(String serviceName) throws CarNotConnectedException {
        Object manager;
        try {
            manager = mCar.getCarManager(serviceName);
        } catch (android.car.CarNotConnectedException e) {
            throw new CarNotConnectedException(e);
        }

        if (manager == null) {
            return null;
        }
        // For publicly available versions, return wrapper version.
        switch (serviceName) {
        case Car.AUDIO_SERVICE:
            return new CarAudioManagerEmbedded(manager);
        case Car.SENSOR_SERVICE:
            return new CarSensorManagerEmbedded(manager);
        case Car.INFO_SERVICE:
            return new CarInfoManagerEmbedded(manager);
        case Car.APP_CONTEXT_SERVICE:
            return new CarAppContextManagerEmbedded(manager);
        case Car.PACKAGE_SERVICE:
            return new CarPackageManagerEmbedded(manager);
        case Car.CAR_NAVIGATION_SERVICE:
            return new CarNavigationManagerEmbedded(manager);
        default:
            return manager;
        }
    }

    private static class CallbackHandler extends Handler {

        private  static final int MSG_DISPATCH_CAR_CONNECTION = 0;

        private CallbackHandler(Looper looper) {
            super(looper);
        }

        private void dispatchCarConnectionCall(CarConnectionListener listener, int connectionType) {
            sendMessage(obtainMessage(MSG_DISPATCH_CAR_CONNECTION, connectionType, 0, listener));
        }

        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
                case MSG_DISPATCH_CAR_CONNECTION:
                    CarConnectionListener listener = (CarConnectionListener) msg.obj;
                    listener.onConnected(msg.arg1);
                    break;
            }
        }
    }
}