/*
 * Copyright (C) 2007 Google Inc.
 *
 * 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 com.android.internal.app;

import android.annotation.UnsupportedAppUsage;
import android.app.AlertDialog;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.widget.Toast;
import android.util.Log;
import android.location.LocationManager;

import com.android.internal.R;
import com.android.internal.location.GpsNetInitiatedHandler;

/**
 * This activity is shown to the user for him/her to accept or deny network-initiated
 * requests. It uses the alert dialog style. It will be launched from a notification.
 */
public class NetInitiatedActivity extends AlertActivity implements DialogInterface.OnClickListener {

    private static final String TAG = "NetInitiatedActivity";

    private static final boolean DEBUG = true;
    private static final boolean VERBOSE = false;

    private static final int POSITIVE_BUTTON = AlertDialog.BUTTON_POSITIVE;
    private static final int NEGATIVE_BUTTON = AlertDialog.BUTTON_NEGATIVE;

    private static final int GPS_NO_RESPONSE_TIME_OUT = 1;
    // Received ID from intent, -1 when no notification is in progress
    private int notificationId = -1;
    private int timeout = -1;
    private int default_response = -1;
    private int default_response_timeout = 6;

    /** Used to detect when NI request is received */
    private BroadcastReceiver mNetInitiatedReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            if (DEBUG) Log.d(TAG, "NetInitiatedReceiver onReceive: " + intent.getAction());
            if (intent.getAction() == GpsNetInitiatedHandler.ACTION_NI_VERIFY) {
                handleNIVerify(intent);
            }
        }
    };

    private final Handler mHandler = new Handler() {
        public void handleMessage(Message msg) {
            switch (msg.what) {
            case GPS_NO_RESPONSE_TIME_OUT: {
                if (notificationId != -1) {
                    sendUserResponse(default_response);
                }
                finish();
            }
            break;
            default:
            }
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // Set up the "dialog"
        final Intent intent = getIntent();
        final AlertController.AlertParams p = mAlertParams;
        Context context = getApplicationContext();
        p.mTitle = intent.getStringExtra(GpsNetInitiatedHandler.NI_INTENT_KEY_TITLE);
        p.mMessage = intent.getStringExtra(GpsNetInitiatedHandler.NI_INTENT_KEY_MESSAGE);
        p.mPositiveButtonText = String.format(context.getString(R.string.gpsVerifYes));
        p.mPositiveButtonListener = this;
        p.mNegativeButtonText = String.format(context.getString(R.string.gpsVerifNo));
        p.mNegativeButtonListener = this;

        notificationId = intent.getIntExtra(GpsNetInitiatedHandler.NI_INTENT_KEY_NOTIF_ID, -1);
        timeout = intent.getIntExtra(GpsNetInitiatedHandler.NI_INTENT_KEY_TIMEOUT, default_response_timeout);
        default_response = intent.getIntExtra(GpsNetInitiatedHandler.NI_INTENT_KEY_DEFAULT_RESPONSE, GpsNetInitiatedHandler.GPS_NI_RESPONSE_ACCEPT);
        if (DEBUG) Log.d(TAG, "onCreate() : notificationId: " + notificationId + " timeout: " + timeout + " default_response:" + default_response);

        mHandler.sendMessageDelayed(mHandler.obtainMessage(GPS_NO_RESPONSE_TIME_OUT), (timeout * 1000));
        setupAlert();
    }

    @Override
    protected void onResume() {
        super.onResume();
        if (DEBUG) Log.d(TAG, "onResume");
        registerReceiver(mNetInitiatedReceiver, new IntentFilter(GpsNetInitiatedHandler.ACTION_NI_VERIFY));
    }

    @Override
    protected void onPause() {
        super.onPause();
        if (DEBUG) Log.d(TAG, "onPause");
        unregisterReceiver(mNetInitiatedReceiver);
    }

    /**
     * {@inheritDoc}
     */
    public void onClick(DialogInterface dialog, int which) {
        if (which == POSITIVE_BUTTON) {
            sendUserResponse(GpsNetInitiatedHandler.GPS_NI_RESPONSE_ACCEPT);
        }
        if (which == NEGATIVE_BUTTON) {
            sendUserResponse(GpsNetInitiatedHandler.GPS_NI_RESPONSE_DENY);
        }

        // No matter what, finish the activity
        finish();
        notificationId = -1;
    }

    // Respond to NI Handler under GnssLocationProvider, 1 = accept, 2 = deny
    private void sendUserResponse(int response) {
        if (DEBUG) Log.d(TAG, "sendUserResponse, response: " + response);
        LocationManager locationManager = (LocationManager)
            this.getSystemService(Context.LOCATION_SERVICE);
        locationManager.sendNiResponse(notificationId, response);
    }

    @UnsupportedAppUsage
    private void handleNIVerify(Intent intent) {
        int notifId = intent.getIntExtra(GpsNetInitiatedHandler.NI_INTENT_KEY_NOTIF_ID, -1);
        notificationId = notifId;

        if (DEBUG) Log.d(TAG, "handleNIVerify action: " + intent.getAction());
    }

    private void showNIError() {
        Toast.makeText(this, "NI error" /* com.android.internal.R.string.usb_storage_error_message */,
                Toast.LENGTH_LONG).show();
    }
}