Copyright (C) 2014 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.
/**
 * Copyright (C) 2014 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.service.voice;

import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.content.res.Configuration;
import android.os.Bundle;
import android.os.IBinder;
import android.os.Looper;
import android.os.Message;
import android.os.RemoteException;
import android.os.ServiceManager;
import com.android.internal.app.IVoiceInteractionManagerService;
import com.android.internal.os.HandlerCaller;
import com.android.internal.os.SomeArgs;

import java.io.FileDescriptor;
import java.io.PrintWriter;

An active voice interaction session, initiated by a VoiceInteractionService. /**
 * An active voice interaction session, initiated by a {@link VoiceInteractionService}.
 */
public abstract class VoiceInteractionSessionService extends Service {

    static final int MSG_NEW_SESSION = 1;

    IVoiceInteractionManagerService mSystemService;
    VoiceInteractionSession mSession;

    IVoiceInteractionSessionService mInterface = new IVoiceInteractionSessionService.Stub() {
        public void newSession(IBinder token, Bundle args, int startFlags) {
            mHandlerCaller.sendMessage(mHandlerCaller.obtainMessageIOO(MSG_NEW_SESSION,
                    startFlags, token, args));

        }
    };

    HandlerCaller mHandlerCaller;
    final HandlerCaller.Callback mHandlerCallerCallback = new HandlerCaller.Callback() {
        @Override
        public void executeMessage(Message msg) {
            SomeArgs args = (SomeArgs)msg.obj;
            switch (msg.what) {
                case MSG_NEW_SESSION:
                    doNewSession((IBinder)args.arg1, (Bundle)args.arg2, args.argi1);
                    break;
            }
        }
    };

    @Override
    public void onCreate() {
        super.onCreate();
        mSystemService = IVoiceInteractionManagerService.Stub.asInterface(
                ServiceManager.getService(Context.VOICE_INTERACTION_MANAGER_SERVICE));
        mHandlerCaller = new HandlerCaller(this, Looper.myLooper(),
                mHandlerCallerCallback, true);
    }

    public abstract VoiceInteractionSession onNewSession(Bundle args);

    @Override
    public IBinder onBind(Intent intent) {
        return mInterface.asBinder();
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        if (mSession != null) {
            mSession.onConfigurationChanged(newConfig);
        }
    }

    @Override
    public void onLowMemory() {
        super.onLowMemory();
        if (mSession != null) {
            mSession.onLowMemory();
        }
    }

    @Override
    public void onTrimMemory(int level) {
        super.onTrimMemory(level);
        if (mSession != null) {
            mSession.onTrimMemory(level);
        }
    }

    @Override
    protected void dump(FileDescriptor fd, PrintWriter writer, String[] args) {
        if (mSession == null) {
            writer.println("(no active session)");
        } else {
            writer.println("VoiceInteractionSession:");
            mSession.dump("  ", fd, writer, args);
        }
    }

    void doNewSession(IBinder token, Bundle args, int startFlags) {
        if (mSession != null) {
            mSession.doDestroy();
            mSession = null;
        }
        mSession = onNewSession(args);
        try {
            mSystemService.deliverNewSession(token, mSession.mSession, mSession.mInteractor);
            mSession.doCreate(mSystemService, token);
        } catch (RemoteException e) {
        }
    }
}