/*
 * Copyright (C) 2012-2014 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 com.android.bluetooth.btservice;

import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothClass;
import android.bluetooth.BluetoothDevice;
import android.content.Intent;
import android.os.Handler;
import android.os.Message;
import android.os.ParcelUuid;
import android.util.Log;

import com.android.bluetooth.Utils;

import java.util.concurrent.atomic.AtomicInteger;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.Queue;

final class RemoteDevices {
    private static final boolean DBG = false;
    private static final String TAG = "BluetoothRemoteDevices";

    // Maximum number of device properties to remember
    private static final int MAX_DEVICE_QUEUE_SIZE = 200;

    private static BluetoothAdapter mAdapter;
    private static AdapterService mAdapterService;
    private static ArrayList<BluetoothDevice> mSdpTracker;
    private Object mObject = new Object();

    private static final int UUID_INTENT_DELAY = 6000;
    private static final int MESSAGE_UUID_INTENT = 1;

    private HashMap<String, DeviceProperties> mDevices;
    private Queue<String> mDeviceQueue;

    RemoteDevices(AdapterService service) {
        mAdapter = BluetoothAdapter.getDefaultAdapter();
        mAdapterService = service;
        mSdpTracker = new ArrayList<BluetoothDevice>();
        mDevices = new HashMap<String, DeviceProperties>();
        mDeviceQueue = new LinkedList<String>();
    }


    void cleanup() {
        if (mSdpTracker !=null)
            mSdpTracker.clear();

        if (mDevices != null)
            mDevices.clear();

        if (mDeviceQueue != null)
            mDeviceQueue.clear();
    }

    @Override
    public Object clone() throws CloneNotSupportedException {
        throw new CloneNotSupportedException();
    }

    DeviceProperties getDeviceProperties(BluetoothDevice device) {
        synchronized (mDevices) {
            return mDevices.get(device.getAddress());
        }
    }

    BluetoothDevice getDevice(byte[] address) {
        DeviceProperties prop = mDevices.get(Utils.getAddressStringFromByte(address));
        if (prop == null)
           return null;
        return prop.getDevice();
    }

    DeviceProperties addDeviceProperties(byte[] address) {
        synchronized (mDevices) {
            DeviceProperties prop = new DeviceProperties();
            prop.mDevice = mAdapter.getRemoteDevice(Utils.getAddressStringFromByte(address));
            prop.mAddress = address;
            String key = Utils.getAddressStringFromByte(address);
            DeviceProperties pv = mDevices.put(key, prop);
            if (pv == null) {
                mDeviceQueue.offer(key);
                if (mDeviceQueue.size() > MAX_DEVICE_QUEUE_SIZE) {
                    String deleteKey = mDeviceQueue.poll();
                    mDevices.remove(deleteKey);
                }
            }
            return prop;
        }
    }

    class DeviceProperties {
        private String mName;
        private byte[] mAddress;
        private int mBluetoothClass;
        private short mRssi;
        private ParcelUuid[] mUuids;
        private int mDeviceType;
        private String mAlias;
        private int mBondState;
        private BluetoothDevice mDevice;

        DeviceProperties() {
            mBondState = BluetoothDevice.BOND_NONE;
        }

        /**
         * @return the mName
         */
        String getName() {
            synchronized (mObject) {
                return mName;
            }
        }

        /**
         * @return the mClass
         */
        int getBluetoothClass() {
            synchronized (mObject) {
                return mBluetoothClass;
            }
        }

        /**
         * @return the mUuids
         */
        ParcelUuid[] getUuids() {
            synchronized (mObject) {
                return mUuids;
            }
        }

        /**
         * @return the mAddress
         */
        byte[] getAddress() {
            synchronized (mObject) {
                return mAddress;
            }
        }

        /**
         * @return the mDevice
         */
        BluetoothDevice getDevice() {
            synchronized (mObject) {
                return mDevice;
            }
        }

        /**
         * @return mRssi
         */
        short getRssi() {
            synchronized (mObject) {
                return mRssi;
            }
        }

        /**
         * @return mDeviceType
         */
        int getDeviceType() {
            synchronized (mObject) {
                return mDeviceType;
            }
        }

        /**
         * @return the mAlias
         */
        String getAlias() {
            synchronized (mObject) {
                return mAlias;
            }
        }

        /**
         * @param mAlias the mAlias to set
         */
        void setAlias(BluetoothDevice device, String mAlias) {
            synchronized (mObject) {
                this.mAlias = mAlias;
                mAdapterService.setDevicePropertyNative(mAddress,
                    AbstractionLayer.BT_PROPERTY_REMOTE_FRIENDLY_NAME, mAlias.getBytes());
                Intent intent = new Intent(BluetoothDevice.ACTION_ALIAS_CHANGED);
                intent.putExtra(BluetoothDevice.EXTRA_DEVICE, device);
                intent.putExtra(BluetoothDevice.EXTRA_NAME, mAlias);
                mAdapterService.sendBroadcast(intent, AdapterService.BLUETOOTH_PERM);
            }
        }

        /**
         * @param mBondState the mBondState to set
         */
        void setBondState(int mBondState) {
            synchronized (mObject) {
                this.mBondState = mBondState;
                if (mBondState == BluetoothDevice.BOND_NONE)
                {
                    /* Clearing the Uuids local copy when the device is unpaired. If not cleared,
                    cachedBluetoothDevice issued a connect using the local cached copy of uuids,
                    without waiting for the ACTION_UUID intent.
                    This was resulting in multiple calls to connect().*/
                    mUuids = null;
                }
            }
        }

        /**
         * @return the mBondState
         */
        int getBondState() {
            synchronized (mObject) {
                return mBondState;
            }
        }
    }

    private void sendUuidIntent(BluetoothDevice device) {
        DeviceProperties prop = getDeviceProperties(device);
        Intent intent = new Intent(BluetoothDevice.ACTION_UUID);
        intent.putExtra(BluetoothDevice.EXTRA_DEVICE, device);
        intent.putExtra(BluetoothDevice.EXTRA_UUID, prop == null? null: prop.mUuids);
        mAdapterService.initProfilePriorities(device, prop.mUuids);
        mAdapterService.sendBroadcast(intent, AdapterService.BLUETOOTH_ADMIN_PERM);

        //Remove the outstanding UUID request
        mSdpTracker.remove(device);
    }


    void devicePropertyChangedCallback(byte[] address, int[] types, byte[][] values) {
        Intent intent;
        byte[] val;
        int type;
        BluetoothDevice bdDevice = getDevice(address);
        DeviceProperties device;
        if (bdDevice == null) {
            device = addDeviceProperties(address);
            bdDevice = getDevice(address);
        } else {
            device = getDeviceProperties(bdDevice);
        }

        for (int j = 0; j < types.length; j++) {
            type = types[j];
            val = values[j];
            if(val.length <= 0)
                errorLog("devicePropertyChangedCallback: bdDevice: " + bdDevice
                        + ", value is empty for type: " + type);
            else {
                synchronized(mObject) {
                    switch (type) {
                        case AbstractionLayer.BT_PROPERTY_BDNAME:
                            device.mName = new String(val);
                            intent = new Intent(BluetoothDevice.ACTION_NAME_CHANGED);
                            intent.putExtra(BluetoothDevice.EXTRA_DEVICE, bdDevice);
                            intent.putExtra(BluetoothDevice.EXTRA_NAME, device.mName);
                            intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT);
                            mAdapterService.sendBroadcast(intent, mAdapterService.BLUETOOTH_PERM);
                            debugLog("Remote Device name is: " + device.mName);
                            break;
                        case AbstractionLayer.BT_PROPERTY_REMOTE_FRIENDLY_NAME:
                            if (device.mAlias != null) {
                                System.arraycopy(val, 0, device.mAlias, 0, val.length);
                            }
                            else {
                                device.mAlias = new String(val);
                            }
                            break;
                        case AbstractionLayer.BT_PROPERTY_BDADDR:
                            device.mAddress = val;
                            debugLog("Remote Address is:" + Utils.getAddressStringFromByte(val));
                            break;
                        case AbstractionLayer.BT_PROPERTY_CLASS_OF_DEVICE:
                            device.mBluetoothClass =  Utils.byteArrayToInt(val);
                            intent = new Intent(BluetoothDevice.ACTION_CLASS_CHANGED);
                            intent.putExtra(BluetoothDevice.EXTRA_DEVICE, bdDevice);
                            intent.putExtra(BluetoothDevice.EXTRA_CLASS,
                                    new BluetoothClass(device.mBluetoothClass));
                            intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT);
                            mAdapterService.sendBroadcast(intent, mAdapterService.BLUETOOTH_PERM);
                            debugLog("Remote class is:" + device.mBluetoothClass);
                            break;
                        case AbstractionLayer.BT_PROPERTY_UUIDS:
                            int numUuids = val.length/AbstractionLayer.BT_UUID_SIZE;
                            device.mUuids = Utils.byteArrayToUuid(val);
                            if (mAdapterService.getState() == BluetoothAdapter.STATE_ON)
                                sendUuidIntent(bdDevice);
                            break;
                        case AbstractionLayer.BT_PROPERTY_TYPE_OF_DEVICE:
                            // The device type from hal layer, defined in bluetooth.h,
                            // matches the type defined in BluetoothDevice.java
                            device.mDeviceType = Utils.byteArrayToInt(val);
                            break;
                        case AbstractionLayer.BT_PROPERTY_REMOTE_RSSI:
                            // RSSI from hal is in one byte
                            device.mRssi = val[0];
                            break;
                    }
                }
            }
        }
    }

    void deviceFoundCallback(byte[] address) {
        // The device properties are already registered - we can send the intent
        // now
        BluetoothDevice device = getDevice(address);
        debugLog("deviceFoundCallback: Remote Address is:" + device);
        DeviceProperties deviceProp = getDeviceProperties(device);
        if (deviceProp == null) {
            errorLog("Device Properties is null for Device:" + device);
            return;
        }

        Intent intent = new Intent(BluetoothDevice.ACTION_FOUND);
        intent.putExtra(BluetoothDevice.EXTRA_DEVICE, device);
        intent.putExtra(BluetoothDevice.EXTRA_CLASS,
                new BluetoothClass(deviceProp.mBluetoothClass));
        intent.putExtra(BluetoothDevice.EXTRA_RSSI, deviceProp.mRssi);
        intent.putExtra(BluetoothDevice.EXTRA_NAME, deviceProp.mName);

        mAdapterService.sendBroadcastMultiplePermissions(intent,
                new String[] {AdapterService.BLUETOOTH_PERM,
                        android.Manifest.permission.ACCESS_COARSE_LOCATION});
    }

    void aclStateChangeCallback(int status, byte[] address, int newState) {
        BluetoothDevice device = getDevice(address);

        if (device == null) {
            errorLog("aclStateChangeCallback: Device is NULL");
            return;
        }
        int state = mAdapterService.getState();
        Log.e(TAG, "state" + state + "newState" + newState);

        DeviceProperties prop = getDeviceProperties(device);
        if (prop == null) {
 //         errorLog("aclStateChangeCallback reported unknown device " + Arrays.toString(address));
        }
        Intent intent = null;
        if (newState == AbstractionLayer.BT_ACL_STATE_CONNECTED) {
            if (state == BluetoothAdapter.STATE_ON || state == BluetoothAdapter.STATE_TURNING_ON) {
                intent = new Intent(BluetoothDevice.ACTION_ACL_CONNECTED);
            } else if (state == BluetoothAdapter.STATE_BLE_ON || state == BluetoothAdapter.STATE_BLE_TURNING_ON) {
                intent = new Intent(BluetoothAdapter.ACTION_BLE_ACL_CONNECTED);
            }
            debugLog("aclStateChangeCallback: State:Connected to Device:" + device);
        } else {
            if (device.getBondState() == BluetoothDevice.BOND_BONDING) {
                /*Broadcasting PAIRING_CANCEL intent as well in this case*/
                intent = new Intent(BluetoothDevice.ACTION_PAIRING_CANCEL);
                intent.putExtra(BluetoothDevice.EXTRA_DEVICE, device);
                mAdapterService.sendBroadcast(intent, mAdapterService.BLUETOOTH_PERM);
            }
            if (state == BluetoothAdapter.STATE_ON || state == BluetoothAdapter.STATE_TURNING_OFF) {
                intent = new Intent(BluetoothDevice.ACTION_ACL_DISCONNECTED);
            } else if (state == BluetoothAdapter.STATE_BLE_ON || state == BluetoothAdapter.STATE_BLE_TURNING_OFF) {
                intent = new Intent(BluetoothAdapter.ACTION_BLE_ACL_DISCONNECTED);
            }
            debugLog("aclStateChangeCallback: State:DisConnected to Device:" + device);
        }
        intent.putExtra(BluetoothDevice.EXTRA_DEVICE, device);
        intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT);
        mAdapterService.sendBroadcast(intent, mAdapterService.BLUETOOTH_PERM);
    }


    void fetchUuids(BluetoothDevice device) {
        if (mSdpTracker.contains(device)) return;
        mSdpTracker.add(device);

        Message message = mHandler.obtainMessage(MESSAGE_UUID_INTENT);
        message.obj = device;
        mHandler.sendMessageDelayed(message, UUID_INTENT_DELAY);

        mAdapterService.getRemoteServicesNative(Utils.getBytesFromAddress(device.getAddress()));
    }

    void updateUuids(BluetoothDevice device) {
        Message message = mHandler.obtainMessage(MESSAGE_UUID_INTENT);
        message.obj = device;
        mHandler.sendMessage(message);
    }

    private final Handler mHandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
            case MESSAGE_UUID_INTENT:
                BluetoothDevice device = (BluetoothDevice)msg.obj;
                if (device != null) {
                    sendUuidIntent(device);
                }
                break;
            }
        }
    };

    private void errorLog(String msg) {
        Log.e(TAG, msg);
    }

    private void debugLog(String msg) {
        if (DBG) Log.d(TAG, msg);
    }

    private void infoLog(String msg) {
        if (DBG) Log.i(TAG, msg);
    }

    private void warnLog(String msg) {
        Log.w(TAG, msg);
    }

}