/*
 * Copyright (C) 2017 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 com.googlecode.android_scripting.facade.bluetooth;

import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;

import com.googlecode.android_scripting.Log;
import com.googlecode.android_scripting.event.Event;
import com.googlecode.android_scripting.facade.EventFacade;

public class BluetoothPairingHelper extends BroadcastReceiver {
    private final EventFacade mEventFacade;
    private static final int DEFAULT_TIMEOUT_MS = 5000;
    private boolean mAutoConfirm = true;

    public BluetoothPairingHelper(EventFacade eventFacade) {
        super();
        mEventFacade = eventFacade;
        Log.d("Pairing helper created.");
    }

  /**
   *  Confirms bluetooth connection/bonding requests.
   */
    @Override
    public void onReceive(Context c, Intent intent) {
        String action = intent.getAction();
        Bundle result = new Bundle();
        Log.d("Bluetooth pairing intent received: " + action);
        BluetoothDevice mDevice = intent.getParcelableExtra(
                BluetoothDevice.EXTRA_DEVICE);
        if (action.equals(BluetoothDevice.ACTION_PAIRING_REQUEST)) {
            mDevice.setMessageAccessPermission(BluetoothDevice.ACCESS_ALLOWED);
            mDevice.setPhonebookAccessPermission(
                    BluetoothDevice.ACCESS_ALLOWED);
            int type = intent.getIntExtra(
                    BluetoothDevice.EXTRA_PAIRING_VARIANT,
                        BluetoothDevice.ERROR);
            Log.d("Processing Action Paring Request with type " + type);
            int pin = intent.getIntExtra(BluetoothDevice.EXTRA_PAIRING_KEY, 0);
            String deviceAddress = mDevice.getAddress();
            result.putInt("Pin", pin);
            result.putInt("PairingVariant", type);
            result.putString("DeviceAddress", deviceAddress);
            mEventFacade.postEvent("BluetoothActionPairingRequest",
                    result.clone());
            result.clear();
            if (type == BluetoothDevice.PAIRING_VARIANT_CONSENT) {
                mDevice.setPairingConfirmation(true);
                Log.d("Connection auto-confirmed by consent");
                // Abort the broadcast so Settings app doesn't get it.
                abortBroadcast();
            } else if (type
                    == BluetoothDevice.PAIRING_VARIANT_PASSKEY_CONFIRMATION) {
                if (mAutoConfirm) {
                    mDevice.setPairingConfirmation(true);
                    Log.d("Connection auto-confirmed");
                } else {
                    // Wait for confirmation
                    Event userConfirmEvent = null;
                    try {
                        userConfirmEvent = mEventFacade.eventWaitFor(
                                "BluetoothActionPairingRequestUserConfirm",
                                     true, DEFAULT_TIMEOUT_MS);
                    } catch (InterruptedException e) {
                        Log.d("Connection interrupted");
                        userConfirmEvent = null;
                    }
                    if (userConfirmEvent == null) {
                        Log.d("Null response received from test server or timeout");
                        mDevice.setPairingConfirmation(false);
                    } else {
                        String userConfirmEventData =
                                (String) userConfirmEvent.getData();
                        if (userConfirmEventData.equalsIgnoreCase("True")) {
                            mDevice.setPairingConfirmation(true);
                            Log.d("Connection confirmed");
                        } else {
                            mDevice.setPairingConfirmation(false);
                            Log.d("Connection rejected");
                        }
                    }
                }
                // Abort the broadcast so Settings app doesn't get it.
                abortBroadcast();
            }
        } else if (action.equals(
                BluetoothDevice.ACTION_CONNECTION_ACCESS_REQUEST)) {
            int type = intent.getIntExtra(
                    BluetoothDevice.EXTRA_ACCESS_REQUEST_TYPE,
                        BluetoothDevice.ERROR);
            Log.d("Processing Action Connection Access Request type " + type);
            if (type == BluetoothDevice.REQUEST_TYPE_MESSAGE_ACCESS
                    || type == BluetoothDevice.REQUEST_TYPE_PHONEBOOK_ACCESS
                        || type
                            == BluetoothDevice.REQUEST_TYPE_PROFILE_CONNECTION) {
                Intent newIntent =
                        new Intent(
                            BluetoothDevice.ACTION_CONNECTION_ACCESS_REPLY);
                String mReturnPackage =
                        intent.getStringExtra(
                        BluetoothDevice.EXTRA_PACKAGE_NAME);
                String mReturnClass =
                        intent.getStringExtra(BluetoothDevice.EXTRA_CLASS_NAME);
                int mRequestType =
                        intent.getIntExtra(
                            BluetoothDevice.EXTRA_ACCESS_REQUEST_TYPE,
                                BluetoothDevice.REQUEST_TYPE_MESSAGE_ACCESS);
                if (mReturnPackage != null && mReturnClass != null) {
                    newIntent.setClassName(mReturnPackage, mReturnClass);
                }
                newIntent.putExtra(BluetoothDevice.EXTRA_CONNECTION_ACCESS_RESULT,
                        BluetoothDevice.CONNECTION_ACCESS_YES);
                newIntent.putExtra(BluetoothDevice.EXTRA_ALWAYS_ALLOWED, true);
                newIntent.putExtra(BluetoothDevice.EXTRA_DEVICE, mDevice);
                newIntent.putExtra(BluetoothDevice.EXTRA_ACCESS_REQUEST_TYPE,
                        mRequestType);
                Log.d("Sending connection access acceptance intent.");
                abortBroadcast();
                c.sendBroadcast(newIntent,
                        android.Manifest.permission.BLUETOOTH_ADMIN);
            }
        }
    }

    /**
     * Set autoConfirm flag to Value.
     */
    public synchronized void setAutoConfirm(boolean value) {
        mAutoConfirm = value;
    }
}