/*
 * Copyright (C) 2008 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.systemui.statusbar.policy;

import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.Set;

public class BluetoothControllerImpl extends BroadcastReceiver implements BluetoothController {
    private static final String TAG = "StatusBar.BluetoothController";

    private final ArrayList<Callback> mCallbacks = new ArrayList<Callback>();
    private final Set<BluetoothDevice> mBondedDevices = new HashSet<BluetoothDevice>();
    private final BluetoothAdapter mAdapter;

    private boolean mEnabled;
    private boolean mConnecting;
    private BluetoothDevice mLastDevice;

    public BluetoothControllerImpl(Context context) {
        mAdapter = BluetoothAdapter.getDefaultAdapter();

        IntentFilter filter = new IntentFilter();
        filter.addAction(BluetoothAdapter.ACTION_STATE_CHANGED);
        filter.addAction(BluetoothAdapter.ACTION_CONNECTION_STATE_CHANGED);
        filter.addAction(BluetoothDevice.ACTION_BOND_STATE_CHANGED);
        context.registerReceiver(this, filter);

        final BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();
        if (adapter != null) {
            handleAdapterStateChange(adapter.getState());
        }
        fireCallbacks();
        updateBondedBluetoothDevices();
    }

    public void addStateChangedCallback(Callback cb) {
        mCallbacks.add(cb);
        fireCallback(cb);
    }

    @Override
    public void removeStateChangedCallback(Callback cb) {
        mCallbacks.remove(cb);
    }

    @Override
    public boolean isBluetoothEnabled() {
        return mAdapter != null && mAdapter.isEnabled();
    }

    @Override
    public boolean isBluetoothConnected() {
        return mAdapter != null
                && mAdapter.getConnectionState() == BluetoothAdapter.STATE_CONNECTED;
    }

    @Override
    public boolean isBluetoothConnecting() {
        return mAdapter != null
                && mAdapter.getConnectionState() == BluetoothAdapter.STATE_CONNECTING;
    }

    @Override
    public void setBluetoothEnabled(boolean enabled) {
        if (mAdapter != null) {
            if (enabled) {
                mAdapter.enable();
            } else {
                mAdapter.disable();
            }
        }
    }

    @Override
    public boolean isBluetoothSupported() {
        return mAdapter != null;
    }

    public Set<BluetoothDevice> getBondedBluetoothDevices() {
        return mBondedDevices;
    }

    @Override
    public String getLastDeviceName() {
        return mLastDevice != null ? mLastDevice.getName()
                : mBondedDevices.size() == 1 ? mBondedDevices.iterator().next().getName()
                : null;
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        final String action = intent.getAction();

        if (action.equals(BluetoothAdapter.ACTION_STATE_CHANGED)) {
            handleAdapterStateChange(
                    intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, BluetoothAdapter.ERROR));
        }
        if (action.equals(BluetoothAdapter.ACTION_CONNECTION_STATE_CHANGED)) {
            mConnecting = intent.getIntExtra(BluetoothAdapter.EXTRA_CONNECTION_STATE, -1)
                    == BluetoothAdapter.STATE_CONNECTING;
            mLastDevice = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
        }
        fireCallbacks();
        updateBondedBluetoothDevices();
    }

    private void updateBondedBluetoothDevices() {
        mBondedDevices.clear();

        BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();
        if (adapter != null) {
            Set<BluetoothDevice> devices = adapter.getBondedDevices();
            if (devices != null) {
                for (BluetoothDevice device : devices) {
                    if (device.getBondState() != BluetoothDevice.BOND_NONE) {
                        mBondedDevices.add(device);
                    }
                }
            }
        }
    }

    private void handleAdapterStateChange(int adapterState) {
        mEnabled = (adapterState == BluetoothAdapter.STATE_ON);
    }

    private void fireCallbacks() {
        for (Callback cb : mCallbacks) {
            fireCallback(cb);
        }
    }

    private void fireCallback(Callback cb) {
        cb.onBluetoothStateChange(mEnabled, mConnecting);
    }
}