/*
 * Copyright (C) 2011 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.bluetooth;

import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Binder;
import android.os.IBinder;
import android.os.ParcelFileDescriptor;
import android.os.RemoteException;
import android.util.Log;

import java.util.ArrayList;
import java.util.List;

/**
 * Public API for Bluetooth Health Profile.
 *
 * <p>BluetoothHealth is a proxy object for controlling the Bluetooth
 * Service via IPC.
 *
 * <p> How to connect to a health device which is acting in the source role.
 *  <li> Use {@link BluetoothAdapter#getProfileProxy} to get
 *  the BluetoothHealth proxy object. </li>
 *  <li> Create an {@link BluetoothHealth} callback and call
 *  {@link #registerSinkAppConfiguration} to register an application
 *  configuration </li>
 *  <li> Pair with the remote device. This currently needs to be done manually
 *  from Bluetooth Settings </li>
 *  <li> Connect to a health device using {@link #connectChannelToSource}. Some
 *  devices will connect the channel automatically. The {@link BluetoothHealth}
 *  callback will inform the application of channel state change. </li>
 *  <li> Use the file descriptor provided with a connected channel to read and
 *  write data to the health channel. </li>
 *  <li> The received data needs to be interpreted using a health manager which
 *  implements the IEEE 11073-xxxxx specifications.
 *  <li> When done, close the health channel by calling {@link #disconnectChannel}
 *  and unregister the application configuration calling
 *  {@link #unregisterAppConfiguration}
 *
 */
public final class BluetoothHealth implements BluetoothProfile {
    private static final String TAG = "BluetoothHealth";
    private static final boolean DBG = true;
    private static final boolean VDBG = false;

    /**
     * Health Profile Source Role - the health device.
     */
    public static final int SOURCE_ROLE = 1 << 0;

    /**
     * Health Profile Sink Role the device talking to the health device.
     */
    public static final int SINK_ROLE = 1 << 1;

    /**
     * Health Profile - Channel Type used - Reliable
     */
    public static final int CHANNEL_TYPE_RELIABLE = 10;

    /**
     * Health Profile - Channel Type used - Streaming
     */
    public static final int CHANNEL_TYPE_STREAMING = 11;

    /**
     * @hide
     */
    public static final int CHANNEL_TYPE_ANY = 12;

    /** @hide */
    public static final int HEALTH_OPERATION_SUCCESS = 6000;
    /** @hide */
    public static final int HEALTH_OPERATION_ERROR = 6001;
    /** @hide */
    public static final int HEALTH_OPERATION_INVALID_ARGS = 6002;
    /** @hide */
    public static final int HEALTH_OPERATION_GENERIC_FAILURE = 6003;
    /** @hide */
    public static final int HEALTH_OPERATION_NOT_FOUND = 6004;
    /** @hide */
    public static final int HEALTH_OPERATION_NOT_ALLOWED = 6005;

    final private IBluetoothStateChangeCallback mBluetoothStateChangeCallback =
            new IBluetoothStateChangeCallback.Stub() {
                public void onBluetoothStateChange(boolean up) {
                    if (DBG) Log.d(TAG, "onBluetoothStateChange: up=" + up);
                    if (!up) {
                        if (VDBG) Log.d(TAG,"Unbinding service...");
                        synchronized (mConnection) {
                            try {
                                mService = null;
                                mContext.unbindService(mConnection);
                            } catch (Exception re) {
                                Log.e(TAG,"",re);
                            }
                        }
                    } else {
                        synchronized (mConnection) {
                            try {
                                if (mService == null) {
                                    if (VDBG) Log.d(TAG,"Binding service...");
                                    doBind();
                                }
                            } catch (Exception re) {
                                Log.e(TAG,"",re);
                            }
                        }
                    }
                }
        };


    /**
     * Register an application configuration that acts as a Health SINK.
     * This is the configuration that will be used to communicate with health devices
     * which will act as the {@link #SOURCE_ROLE}. This is an asynchronous call and so
     * the callback is used to notify success or failure if the function returns true.
     *
     * <p>Requires {@link android.Manifest.permission#BLUETOOTH} permission.
     *
     * @param name The friendly name associated with the application or configuration.
     * @param dataType The dataType of the Source role of Health Profile to which
     *                   the sink wants to connect to.
     * @param callback A callback to indicate success or failure of the registration and
     *               all operations done on this application configuration.
     * @return If true, callback will be called.
     */
    public boolean registerSinkAppConfiguration(String name, int dataType,
            BluetoothHealthCallback callback) {
        if (!isEnabled() || name == null) return false;

        if (VDBG) log("registerSinkApplication(" + name + ":" + dataType + ")");
        return registerAppConfiguration(name, dataType, SINK_ROLE,
                CHANNEL_TYPE_ANY, callback);
    }

    /**
     * Register an application configuration that acts as a Health SINK or in a Health
     * SOURCE role.This is an asynchronous call and so
     * the callback is used to notify success or failure if the function returns true.
     *
     * <p>Requires {@link android.Manifest.permission#BLUETOOTH} permission.
     *
     * @param name The friendly name associated with the application or configuration.
     * @param dataType The dataType of the Source role of Health Profile.
     * @param channelType The channel type. Will be one of
     *                              {@link #CHANNEL_TYPE_RELIABLE}  or
     *                              {@link #CHANNEL_TYPE_STREAMING}
     * @param callback - A callback to indicate success or failure.
     * @return If true, callback will be called.
     * @hide
     */
    public boolean registerAppConfiguration(String name, int dataType, int role,
            int channelType, BluetoothHealthCallback callback) {
        boolean result = false;
        if (!isEnabled() || !checkAppParam(name, role, channelType, callback)) return result;

        if (VDBG) log("registerApplication(" + name + ":" + dataType + ")");
        BluetoothHealthCallbackWrapper wrapper = new BluetoothHealthCallbackWrapper(callback);
        BluetoothHealthAppConfiguration config =
                new BluetoothHealthAppConfiguration(name, dataType, role, channelType);

        final IBluetoothHealth service = mService;
        if (service != null) {
            try {
                result = service.registerAppConfiguration(config, wrapper);
            } catch (RemoteException e) {
                Log.e(TAG, e.toString());
            }
        } else {
            Log.w(TAG, "Proxy not attached to service");
            if (DBG) Log.d(TAG, Log.getStackTraceString(new Throwable()));
        }
        return result;
    }

    /**
     * Unregister an application configuration that has been registered using
     * {@link #registerSinkAppConfiguration}
     *
     * <p>Requires {@link android.Manifest.permission#BLUETOOTH} permission.
     *
     * @param config  The health app configuration
     * @return Success or failure.
     */
    public boolean unregisterAppConfiguration(BluetoothHealthAppConfiguration config) {
        boolean result = false;
        final IBluetoothHealth service = mService;
        if (service != null && isEnabled() && config != null) {
            try {
                result = service.unregisterAppConfiguration(config);
            } catch (RemoteException e) {
                Log.e(TAG, e.toString());
            }
        } else {
            Log.w(TAG, "Proxy not attached to service");
            if (DBG) Log.d(TAG, Log.getStackTraceString(new Throwable()));
        }

        return result;
    }

    /**
     * Connect to a health device which has the {@link #SOURCE_ROLE}.
     * This is an asynchronous call. If this function returns true, the callback
     * associated with the application configuration will be called.
     *
     * <p>Requires {@link android.Manifest.permission#BLUETOOTH} permission.
     *
     * @param device The remote Bluetooth device.
     * @param config The application configuration which has been registered using
     *        {@link #registerSinkAppConfiguration(String, int, BluetoothHealthCallback) }
     * @return If true, the callback associated with the application config will be called.
     */
    public boolean connectChannelToSource(BluetoothDevice device,
            BluetoothHealthAppConfiguration config) {
        final IBluetoothHealth service = mService;
        if (service != null && isEnabled() && isValidDevice(device) && config != null) {
            try {
                return service.connectChannelToSource(device, config);
            } catch (RemoteException e) {
                Log.e(TAG, e.toString());
            }
        } else {
            Log.w(TAG, "Proxy not attached to service");
            if (DBG) Log.d(TAG, Log.getStackTraceString(new Throwable()));
        }
        return false;
    }

    /**
     * Connect to a health device which has the {@link #SINK_ROLE}.
     * This is an asynchronous call. If this function returns true, the callback
     * associated with the application configuration will be called.
     *
     *<p>Requires {@link android.Manifest.permission#BLUETOOTH} permission.
     *
     * @param device The remote Bluetooth device.
     * @param config The application configuration which has been registered using
     *        {@link #registerSinkAppConfiguration(String, int, BluetoothHealthCallback) }
     * @return If true, the callback associated with the application config will be called.
     * @hide
     */
    public boolean connectChannelToSink(BluetoothDevice device,
            BluetoothHealthAppConfiguration config, int channelType) {
        final IBluetoothHealth service = mService;
        if (service != null && isEnabled() && isValidDevice(device) && config != null) {
            try {
                return service.connectChannelToSink(device, config, channelType);
            } catch (RemoteException e) {
                Log.e(TAG, e.toString());
            }
        } else {
            Log.w(TAG, "Proxy not attached to service");
            if (DBG) Log.d(TAG, Log.getStackTraceString(new Throwable()));
        }
        return false;
    }

    /**
     * Disconnect a connected health channel.
     * This is an asynchronous call. If this function returns true, the callback
     * associated with the application configuration will be called.
     *
     *<p>Requires {@link android.Manifest.permission#BLUETOOTH} permission.
     *
     * @param device The remote Bluetooth device.
     * @param config The application configuration which has been registered using
     *        {@link #registerSinkAppConfiguration(String, int, BluetoothHealthCallback) }
     * @param channelId The channel id associated with the channel
     * @return If true, the callback associated with the application config will be called.
     */
    public boolean disconnectChannel(BluetoothDevice device,
            BluetoothHealthAppConfiguration config, int channelId) {
        final IBluetoothHealth service = mService;
        if (service != null && isEnabled() && isValidDevice(device) && config != null) {
            try {
                return service.disconnectChannel(device, config, channelId);
            } catch (RemoteException e) {
                Log.e(TAG, e.toString());
            }
        } else {
            Log.w(TAG, "Proxy not attached to service");
            if (DBG) Log.d(TAG, Log.getStackTraceString(new Throwable()));
        }
        return false;
    }

    /**
     * Get the file descriptor of the main channel associated with the remote device
     * and application configuration.
     *
     * <p>Requires {@link android.Manifest.permission#BLUETOOTH} permission.
     *
     * <p> Its the responsibility of the caller to close the ParcelFileDescriptor
     * when done.
     *
     * @param device The remote Bluetooth health device
     * @param config The application configuration
     * @return null on failure, ParcelFileDescriptor on success.
     */
    public ParcelFileDescriptor getMainChannelFd(BluetoothDevice device,
            BluetoothHealthAppConfiguration config) {
        final IBluetoothHealth service = mService;
        if (service != null && isEnabled() && isValidDevice(device) && config != null) {
            try {
                return service.getMainChannelFd(device, config);
            } catch (RemoteException e) {
                Log.e(TAG, e.toString());
            }
        } else {
            Log.w(TAG, "Proxy not attached to service");
            if (DBG) Log.d(TAG, Log.getStackTraceString(new Throwable()));
        }
        return null;
    }

    /**
     * Get the current connection state of the profile.
     *
     * <p>Requires {@link android.Manifest.permission#BLUETOOTH} permission.
     *
     * This is not specific to any application configuration but represents the connection
     * state of the local Bluetooth adapter with the remote device. This can be used
     * by applications like status bar which would just like to know the state of the
     * local adapter.
     *
     * @param device Remote bluetooth device.
     * @return State of the profile connection. One of
     *               {@link #STATE_CONNECTED}, {@link #STATE_CONNECTING},
     *               {@link #STATE_DISCONNECTED}, {@link #STATE_DISCONNECTING}
     */
    @Override
    public int getConnectionState(BluetoothDevice device) {
        final IBluetoothHealth service = mService;
        if (service != null && isEnabled() && isValidDevice(device)) {
            try {
                return service.getHealthDeviceConnectionState(device);
            } catch (RemoteException e) {
                Log.e(TAG, e.toString());
            }
        } else {
            Log.w(TAG, "Proxy not attached to service");
            if (DBG) Log.d(TAG, Log.getStackTraceString(new Throwable()));
        }
        return STATE_DISCONNECTED;
    }

    /**
     * Get connected devices for the health profile.
     *
     * <p> Return the set of devices which are in state {@link #STATE_CONNECTED}
     *
     * <p>Requires {@link android.Manifest.permission#BLUETOOTH} permission.
     *
     * This is not specific to any application configuration but represents the connection
     * state of the local Bluetooth adapter for this profile. This can be used
     * by applications like status bar which would just like to know the state of the
     * local adapter.
     * @return List of devices. The list will be empty on error.
     */
    @Override
    public List<BluetoothDevice> getConnectedDevices() {
        final IBluetoothHealth service = mService;
        if (service != null && isEnabled()) {
            try {
                return service.getConnectedHealthDevices();
            } catch (RemoteException e) {
                Log.e(TAG, "Stack:" + Log.getStackTraceString(new Throwable()));
                return new ArrayList<BluetoothDevice>();
            }
        }
        if (service == null) Log.w(TAG, "Proxy not attached to service");
        return new ArrayList<BluetoothDevice>();
    }

    /**
     * Get a list of devices that match any of the given connection
     * states.
     *
     * <p> If none of the devices match any of the given states,
     * an empty list will be returned.
     *
     * <p>Requires {@link android.Manifest.permission#BLUETOOTH} permission.
     * This is not specific to any application configuration but represents the connection
     * state of the local Bluetooth adapter for this profile. This can be used
     * by applications like status bar which would just like to know the state of the
     * local adapter.
     *
     * @param states Array of states. States can be one of
     *              {@link #STATE_CONNECTED}, {@link #STATE_CONNECTING},
     *              {@link #STATE_DISCONNECTED}, {@link #STATE_DISCONNECTING},
     * @return List of devices. The list will be empty on error.
     */
    @Override
    public List<BluetoothDevice> getDevicesMatchingConnectionStates(int[] states) {
        final IBluetoothHealth service = mService;
        if (service != null && isEnabled()) {
            try {
                return service.getHealthDevicesMatchingConnectionStates(states);
            } catch (RemoteException e) {
                Log.e(TAG, "Stack:" + Log.getStackTraceString(new Throwable()));
                return new ArrayList<BluetoothDevice>();
            }
        }
        if (service == null) Log.w(TAG, "Proxy not attached to service");
        return new ArrayList<BluetoothDevice>();
    }

    private static class BluetoothHealthCallbackWrapper extends IBluetoothHealthCallback.Stub {
        private BluetoothHealthCallback mCallback;

        public BluetoothHealthCallbackWrapper(BluetoothHealthCallback callback) {
            mCallback = callback;
        }

        @Override
        public void onHealthAppConfigurationStatusChange(BluetoothHealthAppConfiguration config,
                                                         int status) {
           mCallback.onHealthAppConfigurationStatusChange(config, status);
        }

        @Override
        public void onHealthChannelStateChange(BluetoothHealthAppConfiguration config,
                                       BluetoothDevice device, int prevState, int newState,
                                       ParcelFileDescriptor fd, int channelId) {
            mCallback.onHealthChannelStateChange(config, device, prevState, newState, fd,
                                                 channelId);
        }
    }

     /** Health Channel Connection State - Disconnected */
    public static final int STATE_CHANNEL_DISCONNECTED  = 0;
    /** Health Channel Connection State - Connecting */
    public static final int STATE_CHANNEL_CONNECTING    = 1;
    /** Health Channel Connection State - Connected */
    public static final int STATE_CHANNEL_CONNECTED     = 2;
    /** Health Channel Connection State - Disconnecting */
    public static final int STATE_CHANNEL_DISCONNECTING = 3;

    /** Health App Configuration registration success */
    public static final int APP_CONFIG_REGISTRATION_SUCCESS = 0;
    /** Health App Configuration registration failure */
    public static final int APP_CONFIG_REGISTRATION_FAILURE = 1;
    /** Health App Configuration un-registration success */
    public static final int APP_CONFIG_UNREGISTRATION_SUCCESS = 2;
    /** Health App Configuration un-registration failure */
    public static final int APP_CONFIG_UNREGISTRATION_FAILURE = 3;

    private Context mContext;
    private ServiceListener mServiceListener;
    private volatile IBluetoothHealth mService;
    BluetoothAdapter mAdapter;

    /**
     * Create a BluetoothHealth proxy object.
     */
    /*package*/ BluetoothHealth(Context context, ServiceListener l) {
        mContext = context;
        mServiceListener = l;
        mAdapter = BluetoothAdapter.getDefaultAdapter();
        IBluetoothManager mgr = mAdapter.getBluetoothManager();
        if (mgr != null) {
            try {
                mgr.registerStateChangeCallback(mBluetoothStateChangeCallback);
            } catch (RemoteException e) {
                Log.e(TAG,"",e);
            }
        }

        doBind();
    }

    boolean doBind() {
        Intent intent = new Intent(IBluetoothHealth.class.getName());
        ComponentName comp = intent.resolveSystemService(mContext.getPackageManager(), 0);
        intent.setComponent(comp);
        if (comp == null || !mContext.bindServiceAsUser(intent, mConnection, 0,
                android.os.Process.myUserHandle())) {
            Log.e(TAG, "Could not bind to Bluetooth Health Service with " + intent);
            return false;
        }
        return true;
    }

    /*package*/ void close() {
        if (VDBG) log("close()");
        IBluetoothManager mgr = mAdapter.getBluetoothManager();
        if (mgr != null) {
            try {
                mgr.unregisterStateChangeCallback(mBluetoothStateChangeCallback);
            } catch (Exception e) {
                Log.e(TAG,"",e);
            }
        }

        synchronized (mConnection) {
            if (mService != null) {
                try {
                    mService = null;
                    mContext.unbindService(mConnection);
                } catch (Exception re) {
                    Log.e(TAG,"",re);
                }
            }
        }
        mServiceListener = null;
    }

    private final ServiceConnection mConnection = new ServiceConnection() {
        public void onServiceConnected(ComponentName className, IBinder service) {
            if (DBG) Log.d(TAG, "Proxy object connected");
            mService = IBluetoothHealth.Stub.asInterface(Binder.allowBlocking(service));

            if (mServiceListener != null) {
                mServiceListener.onServiceConnected(BluetoothProfile.HEALTH, BluetoothHealth.this);
            }
        }
        public void onServiceDisconnected(ComponentName className) {
            if (DBG) Log.d(TAG, "Proxy object disconnected");
            mService = null;
            if (mServiceListener != null) {
                mServiceListener.onServiceDisconnected(BluetoothProfile.HEALTH);
            }
        }
    };

    private boolean isEnabled() {
        BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();

        if (adapter != null && adapter.getState() == BluetoothAdapter.STATE_ON) return true;
        log("Bluetooth is Not enabled");
        return false;
    }

    private static boolean isValidDevice(BluetoothDevice device) {
        return device != null && BluetoothAdapter.checkBluetoothAddress(device.getAddress());
    }

    private boolean checkAppParam(String name, int role, int channelType,
            BluetoothHealthCallback callback) {
        if (name == null || (role != SOURCE_ROLE && role != SINK_ROLE) ||
                (channelType != CHANNEL_TYPE_RELIABLE &&
                channelType != CHANNEL_TYPE_STREAMING &&
                channelType != CHANNEL_TYPE_ANY) || callback == null) {
            return false;
        }
        if (role == SOURCE_ROLE && channelType == CHANNEL_TYPE_ANY) return false;
        return true;
    }

    private static void log(String msg) {
        Log.d(TAG, msg);
    }
}