/*
 * Copyright (C) 2016 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.annotation.NonNull;
import android.annotation.RequiresPermission;
import android.annotation.SdkConstant;
import android.annotation.SdkConstant.SdkConstantType;
import android.annotation.SuppressLint;
import android.annotation.SystemApi;
import android.bluetooth.annotations.RequiresBluetoothConnectPermission;
import android.content.AttributionSource;
import android.content.Context;
import android.os.IBinder;
import android.os.RemoteException;
import android.util.CloseGuard;
import android.util.Log;

import java.util.Collections;
import java.util.List;

/**
 * This class provides the APIs to control the Bluetooth PBAP Client Profile.
 *
 * @hide
 */
@SystemApi
public final class BluetoothPbapClient implements BluetoothProfile, AutoCloseable {

    private static final String TAG = "BluetoothPbapClient";
    private static final boolean DBG = false;
    private static final boolean VDBG = false;

    private final CloseGuard mCloseGuard;

    /**
     * Intent used to broadcast the change in connection state of the PBAP Client profile.
     *
     * <p>This intent will have 3 extras:
     *
     * <ul>
     *   <li>{@link #EXTRA_STATE} - The current state of the profile.
     *   <li>{@link #EXTRA_PREVIOUS_STATE}- The previous state of the profile.
     *   <li>{@link BluetoothDevice#EXTRA_DEVICE} - The remote device.
     * </ul>
     *
     * <p>{@link #EXTRA_STATE} or {@link #EXTRA_PREVIOUS_STATE} can be any of {@link
     * #STATE_DISCONNECTED}, {@link #STATE_CONNECTING}, {@link #STATE_CONNECTED}, {@link
     * #STATE_DISCONNECTING}.
     *
     * @hide
     */
    @SystemApi
    @SuppressLint("ActionValue")
    @RequiresBluetoothConnectPermission
    @RequiresPermission(
            allOf = {
                android.Manifest.permission.BLUETOOTH_CONNECT,
                android.Manifest.permission.BLUETOOTH_PRIVILEGED,
            })
    @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
    public static final String ACTION_CONNECTION_STATE_CHANGED =
            "android.bluetooth.pbapclient.profile.action.CONNECTION_STATE_CHANGED";

    /** There was an error trying to obtain the state */
    /** @hide */
    public static final int STATE_ERROR = -1;

    /** @hide */
    public static final int RESULT_FAILURE = 0;

    /** @hide */
    public static final int RESULT_SUCCESS = 1;

    /** Connection canceled before completion. */
    /** @hide */
    public static final int RESULT_CANCELED = 2;

    private final BluetoothAdapter mAdapter;
    private final AttributionSource mAttributionSource;

    private IBluetoothPbapClient mService;

    /**
     * Create a BluetoothPbapClient proxy object.
     *
     * @hide
     */
    BluetoothPbapClient(Context context, BluetoothAdapter adapter) {
        if (DBG) {
            Log.d(TAG, "Create BluetoothPbapClient proxy object");
        }
        mAdapter = adapter;
        mAttributionSource = adapter.getAttributionSource();
        mService = null;
        mCloseGuard = new CloseGuard();
        mCloseGuard.open("close");
    }

    /** @hide */
    @SuppressWarnings("Finalize") // TODO(b/314811467)
    protected void finalize() {
        if (mCloseGuard != null) {
            mCloseGuard.warnIfOpen();
        }
        close();
    }

    /**
     * Close the connection to the backing service. Other public functions of BluetoothPbapClient
     * will return default error results once close() has been called. Multiple invocations of
     * close() are ok.
     *
     * @hide
     */
    @Override
    public synchronized void close() {
        mAdapter.closeProfileProxy(this);
        if (mCloseGuard != null) {
            mCloseGuard.close();
        }
    }

    /** @hide */
    @Override
    public void onServiceConnected(IBinder service) {
        mService = IBluetoothPbapClient.Stub.asInterface(service);
    }

    /** @hide */
    @Override
    public void onServiceDisconnected() {
        mService = null;
    }

    private IBluetoothPbapClient getService() {
        return mService;
    }

    /** @hide */
    @Override
    public BluetoothAdapter getAdapter() {
        return mAdapter;
    }

    /**
     * Initiate connection. Upon successful connection to remote PBAP server the Client will attempt
     * to automatically download the users phonebook and call log.
     *
     * @param device a remote device we want connect to
     * @return <code>true</code> if command has been issued successfully; <code>false</code>
     *     otherwise;
     * @hide
     */
    @RequiresBluetoothConnectPermission
    @RequiresPermission(
            allOf = {
                android.Manifest.permission.BLUETOOTH_CONNECT,
                android.Manifest.permission.BLUETOOTH_PRIVILEGED,
            })
    public boolean connect(BluetoothDevice device) {
        if (DBG) {
            log("connect(" + device + ") for PBAP Client.");
        }
        final IBluetoothPbapClient service = getService();
        if (service == null) {
            Log.w(TAG, "Proxy not attached to service");
            if (DBG) log(Log.getStackTraceString(new Throwable()));
        } else if (isEnabled() && isValidDevice(device)) {
            try {
                return service.connect(device, mAttributionSource);
            } catch (RemoteException e) {
                Log.e(TAG, e.toString() + "\n" + Log.getStackTraceString(new Throwable()));
            }
        }
        return false;
    }

    /**
     * Initiate disconnect.
     *
     * @param device Remote Bluetooth Device
     * @return false on error, true otherwise
     * @hide
     */
    @RequiresBluetoothConnectPermission
    @RequiresPermission(
            allOf = {
                android.Manifest.permission.BLUETOOTH_CONNECT,
                android.Manifest.permission.BLUETOOTH_PRIVILEGED,
            })
    public boolean disconnect(BluetoothDevice device) {
        if (DBG) {
            log("disconnect(" + device + ")" + new Exception());
        }
        final IBluetoothPbapClient service = getService();
        if (service == null) {
            Log.w(TAG, "Proxy not attached to service");
            if (DBG) log(Log.getStackTraceString(new Throwable()));
        } else if (isEnabled() && isValidDevice(device)) {
            try {
                return service.disconnect(device, mAttributionSource);
            } catch (RemoteException e) {
                Log.e(TAG, e.toString() + "\n" + Log.getStackTraceString(new Throwable()));
            }
        }
        return false;
    }

    /**
     * {@inheritDoc}
     *
     * @hide
     */
    @SystemApi
    @Override
    @RequiresBluetoothConnectPermission
    @RequiresPermission(
            allOf = {
                android.Manifest.permission.BLUETOOTH_CONNECT,
                android.Manifest.permission.BLUETOOTH_PRIVILEGED,
            })
    public @NonNull List<BluetoothDevice> getConnectedDevices() {
        if (DBG) {
            log("getConnectedDevices()");
        }
        final IBluetoothPbapClient service = getService();
        if (service == null) {
            Log.w(TAG, "Proxy not attached to service");
            if (DBG) log(Log.getStackTraceString(new Throwable()));
        } else if (isEnabled()) {
            try {
                return Attributable.setAttributionSource(
                        service.getConnectedDevices(mAttributionSource), mAttributionSource);
            } catch (RemoteException e) {
                Log.e(TAG, e.toString() + "\n" + Log.getStackTraceString(new Throwable()));
                throw e.rethrowAsRuntimeException();
            }
        }
        return Collections.emptyList();
    }

    /**
     * {@inheritDoc}
     *
     * @hide
     */
    @SystemApi
    @Override
    @RequiresBluetoothConnectPermission
    @RequiresPermission(
            allOf = {
                android.Manifest.permission.BLUETOOTH_CONNECT,
                android.Manifest.permission.BLUETOOTH_PRIVILEGED,
            })
    @NonNull
    public List<BluetoothDevice> getDevicesMatchingConnectionStates(@NonNull int[] states) {
        if (DBG) {
            log("getDevicesMatchingStates()");
        }
        final IBluetoothPbapClient service = getService();
        if (service == null) {
            Log.w(TAG, "Proxy not attached to service");
            if (DBG) log(Log.getStackTraceString(new Throwable()));
        } else if (isEnabled()) {
            try {
                return Attributable.setAttributionSource(
                        service.getDevicesMatchingConnectionStates(states, mAttributionSource),
                        mAttributionSource);
            } catch (RemoteException e) {
                Log.e(TAG, e.toString() + "\n" + Log.getStackTraceString(new Throwable()));
                throw e.rethrowAsRuntimeException();
            }
        }
        return Collections.emptyList();
    }

    /**
     * {@inheritDoc}
     *
     * @hide
     */
    @SystemApi
    @Override
    @RequiresBluetoothConnectPermission
    @RequiresPermission(
            allOf = {
                android.Manifest.permission.BLUETOOTH_CONNECT,
                android.Manifest.permission.BLUETOOTH_PRIVILEGED,
            })
    public @BtProfileState int getConnectionState(@NonNull BluetoothDevice device) {
        if (DBG) {
            log("getConnectionState(" + device + ")");
        }
        final IBluetoothPbapClient service = getService();
        if (service == null) {
            Log.w(TAG, "Proxy not attached to service");
            if (DBG) log(Log.getStackTraceString(new Throwable()));
        } else if (isEnabled() && isValidDevice(device)) {
            try {
                return service.getConnectionState(device, mAttributionSource);
            } catch (RemoteException e) {
                Log.e(TAG, e.toString() + "\n" + Log.getStackTraceString(new Throwable()));
                throw e.rethrowAsRuntimeException();
            }
        }
        return BluetoothProfile.STATE_DISCONNECTED;
    }

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

    private boolean isEnabled() {
        return mAdapter.isEnabled();
    }

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

    /**
     * Set priority of the profile
     *
     * <p>The device should already be paired. Priority can be one of {@link #PRIORITY_ON} or {@link
     * #PRIORITY_OFF},
     *
     * @param device Paired bluetooth device
     * @return true if priority is set, false on error
     * @hide
     */
    @RequiresBluetoothConnectPermission
    @RequiresPermission(
            allOf = {
                android.Manifest.permission.BLUETOOTH_CONNECT,
                android.Manifest.permission.BLUETOOTH_PRIVILEGED,
            })
    public boolean setPriority(BluetoothDevice device, int priority) {
        if (DBG) log("setPriority(" + device + ", " + priority + ")");
        return setConnectionPolicy(device, BluetoothAdapter.priorityToConnectionPolicy(priority));
    }

    /**
     * Set connection policy of the profile
     *
     * <p>The device should already be paired. Connection policy can be one of {@link
     * #CONNECTION_POLICY_ALLOWED}, {@link #CONNECTION_POLICY_FORBIDDEN}, {@link
     * #CONNECTION_POLICY_UNKNOWN}
     *
     * @param device Paired bluetooth device
     * @param connectionPolicy is the connection policy to set to for this profile
     * @return true if connectionPolicy is set, false on error
     * @hide
     */
    @SystemApi
    @RequiresBluetoothConnectPermission
    @RequiresPermission(
            allOf = {
                android.Manifest.permission.BLUETOOTH_CONNECT,
                android.Manifest.permission.BLUETOOTH_PRIVILEGED,
            })
    public boolean setConnectionPolicy(
            @NonNull BluetoothDevice device, @ConnectionPolicy int connectionPolicy) {
        if (DBG) {
            log("setConnectionPolicy(" + device + ", " + connectionPolicy + ")");
        }
        final IBluetoothPbapClient service = getService();
        if (service == null) {
            Log.w(TAG, "Proxy not attached to service");
            if (DBG) log(Log.getStackTraceString(new Throwable()));
        } else if (isEnabled()
                && isValidDevice(device)
                && (connectionPolicy == BluetoothProfile.CONNECTION_POLICY_FORBIDDEN
                        || connectionPolicy == BluetoothProfile.CONNECTION_POLICY_ALLOWED)) {
            try {
                return service.setConnectionPolicy(device, connectionPolicy, mAttributionSource);
            } catch (RemoteException e) {
                Log.e(TAG, e.toString() + "\n" + Log.getStackTraceString(new Throwable()));
                throw e.rethrowAsRuntimeException();
            }
        }
        return false;
    }

    /**
     * Get the priority of the profile.
     *
     * <p>The priority can be any of: {@link #PRIORITY_OFF}, {@link #PRIORITY_ON}, {@link
     * #PRIORITY_UNDEFINED}
     *
     * @param device Bluetooth device
     * @return priority of the device
     * @hide
     */
    @RequiresBluetoothConnectPermission
    @RequiresPermission(
            allOf = {
                android.Manifest.permission.BLUETOOTH_CONNECT,
                android.Manifest.permission.BLUETOOTH_PRIVILEGED,
            })
    public int getPriority(BluetoothDevice device) {
        if (VDBG) log("getPriority(" + device + ")");
        return BluetoothAdapter.connectionPolicyToPriority(getConnectionPolicy(device));
    }

    /**
     * Get the connection policy of the profile.
     *
     * <p>The connection policy can be any of: {@link #CONNECTION_POLICY_ALLOWED}, {@link
     * #CONNECTION_POLICY_FORBIDDEN}, {@link #CONNECTION_POLICY_UNKNOWN}
     *
     * @param device Bluetooth device
     * @return connection policy of the device
     * @hide
     */
    @SystemApi
    @RequiresBluetoothConnectPermission
    @RequiresPermission(
            allOf = {
                android.Manifest.permission.BLUETOOTH_CONNECT,
                android.Manifest.permission.BLUETOOTH_PRIVILEGED,
            })
    public @ConnectionPolicy int getConnectionPolicy(@NonNull BluetoothDevice device) {
        if (VDBG) {
            log("getConnectionPolicy(" + device + ")");
        }
        final IBluetoothPbapClient service = getService();
        if (service == null) {
            Log.w(TAG, "Proxy not attached to service");
            if (DBG) log(Log.getStackTraceString(new Throwable()));
        } else if (isEnabled() && isValidDevice(device)) {
            try {
                return service.getConnectionPolicy(device, mAttributionSource);
            } catch (RemoteException e) {
                Log.e(TAG, e.toString() + "\n" + Log.getStackTraceString(new Throwable()));
                throw e.rethrowAsRuntimeException();
            }
        }
        return BluetoothProfile.CONNECTION_POLICY_FORBIDDEN;
    }
}