/*
 * Copyright (C) 2006-2008 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.server;

import com.android.internal.os.HandlerCaller;
import com.android.internal.view.IInputContext;
import com.android.internal.view.IInputMethod;
import com.android.internal.view.IInputMethodCallback;
import com.android.internal.view.IInputMethodClient;
import com.android.internal.view.IInputMethodManager;
import com.android.internal.view.IInputMethodSession;
import com.android.internal.view.InputBindResult;

import com.android.server.status.IconData;
import com.android.server.status.StatusBarService;

import org.xmlpull.v1.XmlPullParserException;

import android.app.ActivityManagerNative;
import android.app.AlertDialog;
import android.content.ComponentName;
import android.content.ContentResolver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.IntentFilter;
import android.content.DialogInterface.OnCancelListener;
import android.content.Intent;
import android.content.ServiceConnection;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.content.pm.ServiceInfo;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.database.ContentObserver;
import android.net.Uri;
import android.os.Binder;
import android.os.Handler;
import android.os.IBinder;
import android.os.IInterface;
import android.os.Message;
import android.os.Parcel;
import android.os.RemoteException;
import android.os.ServiceManager;
import android.provider.Settings;
import android.text.TextUtils;
import android.util.Log;
import android.util.PrintWriterPrinter;
import android.util.Printer;
import android.view.IWindowManager;
import android.view.WindowManager;
import android.view.inputmethod.InputBinding;
import android.view.inputmethod.InputMethod;
import android.view.inputmethod.InputMethodInfo;
import android.view.inputmethod.InputMethodManager;
import android.view.inputmethod.EditorInfo;

import java.io.FileDescriptor;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

/**
 * This class provides a system service that manages input methods.
 */
public class InputMethodManagerService extends IInputMethodManager.Stub
        implements ServiceConnection, Handler.Callback {
    static final boolean DEBUG = false;
    static final String TAG = "InputManagerService";

    static final int MSG_SHOW_IM_PICKER = 1;
    
    static final int MSG_UNBIND_INPUT = 1000;
    static final int MSG_BIND_INPUT = 1010;
    static final int MSG_SHOW_SOFT_INPUT = 1020;
    static final int MSG_HIDE_SOFT_INPUT = 1030;
    static final int MSG_ATTACH_TOKEN = 1040;
    static final int MSG_CREATE_SESSION = 1050;
    
    static final int MSG_START_INPUT = 2000;
    static final int MSG_RESTART_INPUT = 2010;
    
    static final int MSG_UNBIND_METHOD = 3000;
    static final int MSG_BIND_METHOD = 3010;
    
    final Context mContext;
    final Handler mHandler;
    final SettingsObserver mSettingsObserver;
    final StatusBarService mStatusBar;
    final IBinder mInputMethodIcon;
    final IconData mInputMethodData;
    final IWindowManager mIWindowManager;
    final HandlerCaller mCaller;
    
    final InputBindResult mNoBinding = new InputBindResult(null, null, -1);
    
    // All known input methods.  mMethodMap also serves as the global
    // lock for this class.
    final ArrayList<InputMethodInfo> mMethodList
            = new ArrayList<InputMethodInfo>();
    final HashMap<String, InputMethodInfo> mMethodMap
            = new HashMap<String, InputMethodInfo>();

    final TextUtils.SimpleStringSplitter mStringColonSplitter
            = new TextUtils.SimpleStringSplitter(':');
    
    class SessionState {
        final ClientState client;
        final IInputMethod method;
        final IInputMethodSession session;
        
        @Override
        public String toString() {
            return "SessionState{uid " + client.uid + " pid " + client.pid
                    + " method " + Integer.toHexString(
                            System.identityHashCode(method))
                    + " session " + Integer.toHexString(
                            System.identityHashCode(session))
                    + "}";
        }

        SessionState(ClientState _client, IInputMethod _method,
                IInputMethodSession _session) {
            client = _client;
            method = _method;
            session = _session;
        }
    }
    
    class ClientState {
        final IInputMethodClient client;
        final IInputContext inputContext;
        final int uid;
        final int pid;
        final InputBinding binding;
        
        boolean sessionRequested;
        SessionState curSession;
        
        @Override
        public String toString() {
            return "ClientState{" + Integer.toHexString(
                    System.identityHashCode(this)) + " uid " + uid
                    + " pid " + pid + "}";
        }

        ClientState(IInputMethodClient _client, IInputContext _inputContext,
                int _uid, int _pid) {
            client = _client;
            inputContext = _inputContext;
            uid = _uid;
            pid = _pid;
            binding = new InputBinding(null, inputContext.asBinder(), uid, pid);
        }
    }
    
    final HashMap<IBinder, ClientState> mClients
            = new HashMap<IBinder, ClientState>();
    
    /**
     * Id of the currently selected input method.
     */
    String mCurMethodId;
    
    /**
     * The current binding sequence number, incremented every time there is
     * a new bind performed.
     */
    int mCurSeq;
    
    /**
     * The client that is currently bound to an input method.
     */
    ClientState mCurClient;
    
    /**
     * The input context last provided by the current client.
     */
    IInputContext mCurInputContext;
    
    /**
     * The attributes last provided by the current client.
     */
    EditorInfo mCurAttribute;
    
    /**
     * The input method ID of the input method service that we are currently
     * connected to or in the process of connecting to.
     */
    String mCurId;
    
    /**
     * Set to true if our ServiceConnection is currently actively bound to
     * a service (whether or not we have gotten its IBinder back yet).
     */
    boolean mHaveConnection;
    
    /**
     * Set if the client has asked for the input method to be shown.
     */
    boolean mShowRequested;
    
    /**
     * Set if we were explicitly told to show the input method.
     */
    boolean mShowExplicitlyRequested;
    
    /**
     * Set if we were forced to be shown.
     */
    boolean mShowForced;
    
    /**
     * Set if we last told the input method to show itself.
     */
    boolean mInputShown;
    
    /**
     * The Intent used to connect to the current input method.
     */
    Intent mCurIntent;
    
    /**
     * The token we have made for the currently active input method, to
     * identify it in the future.
     */
    IBinder mCurToken;
    
    /**
     * If non-null, this is the input method service we are currently connected
     * to.
     */
    IInputMethod mCurMethod;
    
    /**
     * Have we called mCurMethod.bindInput()?
     */
    boolean mBoundToMethod;
    
    /**
     * Currently enabled session.  Only touched by service thread, not
     * protected by a lock.
     */
    SessionState mEnabledSession;
    
    /**
     * True if the screen is on.  The value is true initially.
     */
    boolean mScreenOn = true;
    
    AlertDialog.Builder mDialogBuilder;
    AlertDialog mSwitchingDialog;
    InputMethodInfo[] mIms;
    CharSequence[] mItems;
    
    class SettingsObserver extends ContentObserver {
        SettingsObserver(Handler handler) {
            super(handler);
            ContentResolver resolver = mContext.getContentResolver();
            resolver.registerContentObserver(Settings.Secure.getUriFor(
                    Settings.Secure.DEFAULT_INPUT_METHOD), false, this);
        }
        
        @Override public void onChange(boolean selfChange) {
            synchronized (mMethodMap) {
                updateFromSettingsLocked();
            }
        }
    }
    
    class ScreenOnOffReceiver extends android.content.BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {
            if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {
                mScreenOn = true;
            } else if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
                mScreenOn = false;
            } else {
                Log.w(TAG, "Unexpected intent " + intent);
            }

            // Inform the current client of the change in active status
            try {
                if (mCurClient != null && mCurClient.client != null) {
                    mCurClient.client.setActive(mScreenOn);
                }
            } catch (RemoteException e) {
                Log.w(TAG, "Got RemoteException sending 'screen on/off' notification to pid "
                        + mCurClient.pid + " uid " + mCurClient.uid);
            }
        }
    }
    
    class PackageReceiver extends android.content.BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {
            synchronized (mMethodMap) {
                buildInputMethodListLocked(mMethodList, mMethodMap);
                
                InputMethodInfo curIm = null;
                String curInputMethodId = Settings.Secure.getString(context
                        .getContentResolver(), Settings.Secure.DEFAULT_INPUT_METHOD);
                final int N = mMethodList.size();
                if (curInputMethodId != null) {
                    for (int i=0; i<N; i++) {
                        if (mMethodList.get(i).getId().equals(curInputMethodId)) {
                            curIm = mMethodList.get(i);
                        }
                    }
                }
                
                boolean changed = false;
                
                Uri uri = intent.getData();
                String pkg = uri != null ? uri.getSchemeSpecificPart() : null;
                if (curIm != null && curIm.getPackageName().equals(pkg)) {
                    ServiceInfo si = null;
                    try {
                        si = mContext.getPackageManager().getServiceInfo(
                                curIm.getComponent(), 0);
                    } catch (PackageManager.NameNotFoundException ex) {
                    }
                    if (si == null) {
                        // Uh oh, current input method is no longer around!
                        // Pick another one...
                        Log.i(TAG, "Current input method removed: " + curInputMethodId);
                        List<InputMethodInfo> enabled = getEnabledInputMethodListLocked();
                        if (enabled != null && enabled.size() > 0) {
                            changed = true;
                            curIm = enabled.get(0);
                            curInputMethodId = curIm.getId();
                            Log.i(TAG, "Switching to: " + curInputMethodId);
                            Settings.Secure.putString(mContext.getContentResolver(),
                                    Settings.Secure.DEFAULT_INPUT_METHOD,
                                    curInputMethodId);
                        } else if (curIm != null) {
                            changed = true;
                            curIm = null;
                            curInputMethodId = "";
                            Log.i(TAG, "Unsetting current input method");
                            Settings.Secure.putString(mContext.getContentResolver(),
                                    Settings.Secure.DEFAULT_INPUT_METHOD,
                                    curInputMethodId);
                        }
                    }
                    
                } else if (curIm == null) {
                    // We currently don't have a default input method... is
                    // one now available?
                    List<InputMethodInfo> enabled = getEnabledInputMethodListLocked();
                    if (enabled != null && enabled.size() > 0) {
                        changed = true;
                        curIm = enabled.get(0);
                        curInputMethodId = curIm.getId();
                        Log.i(TAG, "New default input method: " + curInputMethodId);
                        Settings.Secure.putString(mContext.getContentResolver(),
                                Settings.Secure.DEFAULT_INPUT_METHOD,
                                curInputMethodId);
                    }
                }
                
                if (changed) {
                    updateFromSettingsLocked();
                }
            }
        }
    }
    
    class MethodCallback extends IInputMethodCallback.Stub {
        final IInputMethod mMethod;
        
        MethodCallback(IInputMethod method) {
            mMethod = method;
        }
        
        public void finishedEvent(int seq, boolean handled) throws RemoteException {
        }

        public void sessionCreated(IInputMethodSession session) throws RemoteException {
            onSessionCreated(mMethod, session);
        }
    }
    
    public InputMethodManagerService(Context context, StatusBarService statusBar) {
        mContext = context;
        mHandler = new Handler(this);
        mIWindowManager = IWindowManager.Stub.asInterface(
                ServiceManager.getService(Context.WINDOW_SERVICE));
        mCaller = new HandlerCaller(context, new HandlerCaller.Callback() {
            public void executeMessage(Message msg) {
                handleMessage(msg);
            }
        });
        
        IntentFilter packageFilt = new IntentFilter();
        packageFilt.addAction(Intent.ACTION_PACKAGE_ADDED);
        packageFilt.addAction(Intent.ACTION_PACKAGE_CHANGED);
        packageFilt.addAction(Intent.ACTION_PACKAGE_REMOVED);
        packageFilt.addAction(Intent.ACTION_PACKAGE_RESTARTED);
        packageFilt.addDataScheme("package");
        mContext.registerReceiver(new PackageReceiver(), packageFilt);
        
        IntentFilter screenOnOffFilt = new IntentFilter();
        screenOnOffFilt.addAction(Intent.ACTION_SCREEN_ON);
        screenOnOffFilt.addAction(Intent.ACTION_SCREEN_OFF);
        mContext.registerReceiver(new ScreenOnOffReceiver(), screenOnOffFilt);
        
        buildInputMethodListLocked(mMethodList, mMethodMap);

        final String enabledStr = Settings.Secure.getString(
                mContext.getContentResolver(),
                Settings.Secure.ENABLED_INPUT_METHODS);
        Log.i(TAG, "Enabled input methods: " + enabledStr);
        if (enabledStr == null) {
            Log.i(TAG, "Enabled input methods has not been set, enabling all");
            InputMethodInfo defIm = null;
            StringBuilder sb = new StringBuilder(256);
            final int N = mMethodList.size();
            for (int i=0; i<N; i++) {
                InputMethodInfo imi = mMethodList.get(i);
                Log.i(TAG, "Adding: " + imi.getId());
                if (i > 0) sb.append(':');
                sb.append(imi.getId());
                if (defIm == null && imi.getIsDefaultResourceId() != 0) {
                    try {
                        Resources res = mContext.createPackageContext(
                                imi.getPackageName(), 0).getResources();
                        if (res.getBoolean(imi.getIsDefaultResourceId())) {
                            defIm = imi;
                            Log.i(TAG, "Selected default: " + imi.getId());
                        }
                    } catch (PackageManager.NameNotFoundException ex) {
                    } catch (Resources.NotFoundException ex) {
                    }
                }
            }
            if (defIm == null && N > 0) {
                defIm = mMethodList.get(0);
                Log.i(TAG, "No default found, using " + defIm.getId());
            }
            Settings.Secure.putString(mContext.getContentResolver(),
                    Settings.Secure.ENABLED_INPUT_METHODS, sb.toString());
            if (defIm != null) {
                Settings.Secure.putString(mContext.getContentResolver(),
                        Settings.Secure.DEFAULT_INPUT_METHOD, defIm.getId());
            }
        }
        
        mStatusBar = statusBar;
        mInputMethodData = IconData.makeIcon("ime", null, 0, 0, 0);
        mInputMethodIcon = statusBar.addIcon(mInputMethodData, null);
        statusBar.setIconVisibility(mInputMethodIcon, false);
        
        mSettingsObserver = new SettingsObserver(mHandler);
        updateFromSettingsLocked();
    }

    @Override
    public boolean onTransact(int code, Parcel data, Parcel reply, int flags)
            throws RemoteException {
        try {
            return super.onTransact(code, data, reply, flags);
        } catch (RuntimeException e) {
            // The input method manager only throws security exceptions, so let's
            // log all others.
            if (!(e instanceof SecurityException)) {
                Log.e(TAG, "Input Method Manager Crash", e);
            }
            throw e;
        }
    }

    public void systemReady() {
        
    }
    
    public List<InputMethodInfo> getInputMethodList() {
        synchronized (mMethodMap) {
            return new ArrayList<InputMethodInfo>(mMethodList);
        }
    }

    public List<InputMethodInfo> getEnabledInputMethodList() {
        synchronized (mMethodMap) {
            return getEnabledInputMethodListLocked();
        }
    }

    List<InputMethodInfo> getEnabledInputMethodListLocked() {
        final ArrayList<InputMethodInfo> res = new ArrayList<InputMethodInfo>();
        
        final String enabledStr = Settings.Secure.getString(
                mContext.getContentResolver(),
                Settings.Secure.ENABLED_INPUT_METHODS);
        if (enabledStr != null) {
            final TextUtils.SimpleStringSplitter splitter = mStringColonSplitter;
            splitter.setString(enabledStr);
            
            while (splitter.hasNext()) {
                InputMethodInfo info = mMethodMap.get(splitter.next());
                if (info != null) {
                    res.add(info);
                }
            }
        }
        
        return res;
    }

    public void addClient(IInputMethodClient client,
            IInputContext inputContext, int uid, int pid) {
        synchronized (mMethodMap) {
            mClients.put(client.asBinder(), new ClientState(client,
                    inputContext, uid, pid));
        }
    }
    
    public void removeClient(IInputMethodClient client) {
        synchronized (mMethodMap) {
            mClients.remove(client.asBinder());
        }
    }
    
    void executeOrSendMessage(IInterface target, Message msg) {
         if (target.asBinder() instanceof Binder) {
             mCaller.sendMessage(msg);
         } else {
             handleMessage(msg);
             msg.recycle();
         }
    }
    
    void unbindCurrentInputLocked() {
        if (mCurClient != null) {
            if (DEBUG) Log.v(TAG, "unbindCurrentInputLocked: client = "
                    + mCurClient.client.asBinder());
            if (mBoundToMethod) {
                mBoundToMethod = false;
                if (mCurMethod != null) {
                    executeOrSendMessage(mCurMethod, mCaller.obtainMessageO(
                            MSG_UNBIND_INPUT, mCurMethod));
                }
            }
            executeOrSendMessage(mCurClient.client, mCaller.obtainMessageIO(
                    MSG_UNBIND_METHOD, mCurSeq, mCurClient.client));
            mCurClient.sessionRequested = false;
            
            // Call setActive(false) on the old client
            try {
                mCurClient.client.setActive(false);
            } catch (RemoteException e) {
                Log.w(TAG, "Got RemoteException sending setActive(false) notification to pid "
                        + mCurClient.pid + " uid " + mCurClient.uid);
            }
            mCurClient = null;
        }
    }
    
    private int getShowFlags() {
        int flags = 0;
        if (mShowForced) {
            flags |= InputMethod.SHOW_FORCED
                    | InputMethod.SHOW_EXPLICIT;
        } else if (mShowExplicitlyRequested) {
            flags |= InputMethod.SHOW_EXPLICIT;
        }
        return flags;
    }
    
    InputBindResult attachNewInputLocked(boolean initial, boolean needResult) {
        if (!mBoundToMethod) {
            executeOrSendMessage(mCurMethod, mCaller.obtainMessageOO(
                    MSG_BIND_INPUT, mCurMethod, mCurClient.binding));
            mBoundToMethod = true;
        }
        final SessionState session = mCurClient.curSession;
        if (initial) {
            executeOrSendMessage(session.method, mCaller.obtainMessageOOO(
                    MSG_START_INPUT, session, mCurInputContext, mCurAttribute));
        } else {
            executeOrSendMessage(session.method, mCaller.obtainMessageOOO(
                    MSG_RESTART_INPUT, session, mCurInputContext, mCurAttribute));
        }
        if (mShowRequested) {
            if (DEBUG) Log.v(TAG, "Attach new input asks to show input");
            showCurrentInputLocked(getShowFlags());
        }
        return needResult
                ? new InputBindResult(session.session, mCurId, mCurSeq)
                : null;
    }
    
    InputBindResult startInputLocked(IInputMethodClient client,
            IInputContext inputContext, EditorInfo attribute,
            boolean initial, boolean needResult) {
        // If no method is currently selected, do nothing.
        if (mCurMethodId == null) {
            return mNoBinding;
        }
        
        ClientState cs = mClients.get(client.asBinder());
        if (cs == null) {
            throw new IllegalArgumentException("unknown client "
                    + client.asBinder());
        }
        
        try {
            if (!mIWindowManager.inputMethodClientHasFocus(cs.client)) {
                // Check with the window manager to make sure this client actually
                // has a window with focus.  If not, reject.  This is thread safe
                // because if the focus changes some time before or after, the
                // next client receiving focus that has any interest in input will
                // be calling through here after that change happens.
                Log.w(TAG, "Starting input on non-focused client " + cs.client
                        + " (uid=" + cs.uid + " pid=" + cs.pid + ")");
                return null;
            }
        } catch (RemoteException e) {
        }
        
        if (mCurClient != cs) {
            // If the client is changing, we need to switch over to the new
            // one.
            unbindCurrentInputLocked();
            if (DEBUG) Log.v(TAG, "switching to client: client = "
                    + cs.client.asBinder());

            // If the screen is on, inform the new client it is active
            if (mScreenOn) {
                try {
                    cs.client.setActive(mScreenOn);
                } catch (RemoteException e) {
                    Log.w(TAG, "Got RemoteException sending setActive notification to pid "
                            + cs.pid + " uid " + cs.uid);
                }
            }
        }
        
        // Bump up the sequence for this client and attach it.
        mCurSeq++;
        if (mCurSeq <= 0) mCurSeq = 1;
        mCurClient = cs;
        mCurInputContext = inputContext;
        mCurAttribute = attribute;
        
        // Check if the input method is changing.
        if (mCurId != null && mCurId.equals(mCurMethodId)) {
            if (cs.curSession != null) {
                // Fast case: if we are already connected to the input method,
                // then just return it.
                return attachNewInputLocked(initial, needResult);
            }
            if (mHaveConnection) {
                if (mCurMethod != null && !cs.sessionRequested) {
                    cs.sessionRequested = true;
                    if (DEBUG) Log.v(TAG, "Creating new session for client " + cs);
                    executeOrSendMessage(mCurMethod, mCaller.obtainMessageOO(
                            MSG_CREATE_SESSION, mCurMethod,
                            new MethodCallback(mCurMethod)));
                }
                return new InputBindResult(null, mCurId, mCurSeq);
            }
        }
        
        InputMethodInfo info = mMethodMap.get(mCurMethodId);
        if (info == null) {
            throw new IllegalArgumentException("Unknown id: " + mCurMethodId);
        }
        
        if (mCurToken != null) {
            try {
                if (DEBUG) Log.v(TAG, "Removing window token: " + mCurToken);
                mIWindowManager.removeWindowToken(mCurToken);
            } catch (RemoteException e) {
            }
            mCurToken = null;
        }
        
        if (mHaveConnection) {
            mContext.unbindService(this);
            mHaveConnection = false;
        }
        
        clearCurMethod();
        
        mCurIntent = new Intent(InputMethod.SERVICE_INTERFACE);
        mCurIntent.setComponent(info.getComponent());
        if (mContext.bindService(mCurIntent, this, Context.BIND_AUTO_CREATE)) {
            mHaveConnection = true;
            mCurId = info.getId();
            mCurToken = new Binder();
            try {
                if (DEBUG) Log.v(TAG, "Adding window token: " + mCurToken);
                mIWindowManager.addWindowToken(mCurToken,
                        WindowManager.LayoutParams.TYPE_INPUT_METHOD);
            } catch (RemoteException e) {
            }
            return new InputBindResult(null, mCurId, mCurSeq);
        } else {
            mCurIntent = null;
            Log.w(TAG, "Failure connecting to input method service: "
                    + mCurIntent);
        }
        return null;
    }
    
    public InputBindResult startInput(IInputMethodClient client,
            IInputContext inputContext, EditorInfo attribute,
            boolean initial, boolean needResult) {
        synchronized (mMethodMap) {
            final long ident = Binder.clearCallingIdentity();
            try {
                return startInputLocked(client, inputContext, attribute,
                        initial, needResult);
            } finally {
                Binder.restoreCallingIdentity(ident);
            }
        }
    }
    
    public void finishInput(IInputMethodClient client) {
    }
    
    public void onServiceConnected(ComponentName name, IBinder service) {
        synchronized (mMethodMap) {
            if (mCurIntent != null && name.equals(mCurIntent.getComponent())) {
                mCurMethod = IInputMethod.Stub.asInterface(service);
                if (mCurClient != null) {
                    if (DEBUG) Log.v(TAG, "Initiating attach with token: " + mCurToken);
                    executeOrSendMessage(mCurMethod, mCaller.obtainMessageOO(
                            MSG_ATTACH_TOKEN, mCurMethod, mCurToken));
                    if (mCurClient != null) {
                        if (DEBUG) Log.v(TAG, "Creating first session while with client "
                                + mCurClient);
                        executeOrSendMessage(mCurMethod, mCaller.obtainMessageOO(
                                MSG_CREATE_SESSION, mCurMethod,
                                new MethodCallback(mCurMethod)));
                    }
                }
            }
        }
    }

    void onSessionCreated(IInputMethod method, IInputMethodSession session) {
        synchronized (mMethodMap) {
            if (mCurMethod == method) {
                if (mCurClient != null) {
                    mCurClient.curSession = new SessionState(mCurClient,
                            method, session);
                    mCurClient.sessionRequested = false;
                    InputBindResult res = attachNewInputLocked(true, true);
                    if (res.method != null) {
                        executeOrSendMessage(mCurClient.client, mCaller.obtainMessageOO(
                                MSG_BIND_METHOD, mCurClient.client, res));
                    }
                }
            }
        }
    }
    
    void clearCurMethod() {
        if (mCurMethod != null) {
            for (ClientState cs : mClients.values()) {
                cs.sessionRequested = false;
                cs.curSession = null;
            }
            mCurMethod = null;
        }
    }
    
    public void onServiceDisconnected(ComponentName name) {
        synchronized (mMethodMap) {
            if (DEBUG) Log.v(TAG, "Service disconnected: " + name
                    + " mCurIntent=" + mCurIntent);
            if (mCurMethod != null && mCurIntent != null
                    && name.equals(mCurIntent.getComponent())) {
                clearCurMethod();
                mShowRequested = mInputShown;
                mInputShown = false;
                if (mCurClient != null) {
                    executeOrSendMessage(mCurClient.client, mCaller.obtainMessageIO(
                            MSG_UNBIND_METHOD, mCurSeq, mCurClient.client));
                }
            }
        }
    }

    public void updateStatusIcon(int iconId, String iconPackage) {
        if (iconId == 0) {
            Log.d(TAG, "hide the small icon for the input method");
            mStatusBar.setIconVisibility(mInputMethodIcon, false);
        } else {
            Log.d(TAG, "show a small icon for the input method");

            if (iconPackage != null
                    && iconPackage
                            .equals(InputMethodManager.BUILDIN_INPUTMETHOD_PACKAGE)) {
                iconPackage = null;
            }

            mInputMethodData.iconId = iconId;
            mInputMethodData.iconPackage = iconPackage;
            mStatusBar.updateIcon(mInputMethodIcon, mInputMethodData, null);
            mStatusBar.setIconVisibility(mInputMethodIcon, true);
        }
    }

    void updateFromSettingsLocked() {
        String id = Settings.Secure.getString(mContext.getContentResolver(),
            Settings.Secure.DEFAULT_INPUT_METHOD);
        if (id != null) {
            try {
                setInputMethodLocked(id);
            } catch (IllegalArgumentException e) {
                Log.w(TAG, "Unknown input method from prefs: " + id, e);
            }
        }
    }
    
    void setInputMethodLocked(String id) {
        InputMethodInfo info = mMethodMap.get(id);
        if (info == null) {
            throw new IllegalArgumentException("Unknown id: " + mCurMethodId);
        }
        
        if (id.equals(mCurMethodId)) {
            return;
        }
        
        final long ident = Binder.clearCallingIdentity();
        try {
            mCurMethodId = id;
            Settings.Secure.putString(mContext.getContentResolver(),
                Settings.Secure.DEFAULT_INPUT_METHOD, id);

            if (ActivityManagerNative.isSystemReady()) {
                Intent intent = new Intent(Intent.ACTION_INPUT_METHOD_CHANGED);
                intent.putExtra("input_method_id", id);
                mContext.sendBroadcast(intent);
            }
            unbindCurrentInputLocked();
        } finally {
            Binder.restoreCallingIdentity(ident);
        }
    }
    
    public void showSoftInput(IInputMethodClient client, int flags) {
        synchronized (mMethodMap) {
            if (mCurClient == null || client == null
                    || mCurClient.client.asBinder() != client.asBinder()) {
                try {
                    // We need to check if this is the current client with
                    // focus in the window manager, to allow this call to
                    // be made before input is started in it.
                    if (!mIWindowManager.inputMethodClientHasFocus(client)) {
                        Log.w(TAG, "Ignoring showSoftInput of: " + client);
                        return;
                    }
                } catch (RemoteException e) {
                }
            }

            if (DEBUG) Log.v(TAG, "Client requesting input be shown");
            showCurrentInputLocked(flags);
        }
    }
    
    void showCurrentInputLocked(int flags) {
        mShowRequested = true;
        if ((flags&InputMethodManager.SHOW_IMPLICIT) == 0) {
            mShowExplicitlyRequested = true;
        }
        if ((flags&InputMethodManager.SHOW_FORCED) != 0) {
            mShowExplicitlyRequested = true;
            mShowForced = true;
        }
        if (mCurMethod != null) {
            executeOrSendMessage(mCurMethod, mCaller.obtainMessageIO(
                    MSG_SHOW_SOFT_INPUT, getShowFlags(), mCurMethod));
            mInputShown = true;
        }
    }
    
    public void hideSoftInput(IInputMethodClient client, int flags) {
        synchronized (mMethodMap) {
            if (mCurClient == null || client == null
                    || mCurClient.client.asBinder() != client.asBinder()) {
                try {
                    // We need to check if this is the current client with
                    // focus in the window manager, to allow this call to
                    // be made before input is started in it.
                    if (!mIWindowManager.inputMethodClientHasFocus(client)) {
                        Log.w(TAG, "Ignoring hideSoftInput of: " + client);
                        return;
                    }
                } catch (RemoteException e) {
                }
            }

            if (DEBUG) Log.v(TAG, "Client requesting input be hidden");
            hideCurrentInputLocked(flags);
        }
    }
    
    void hideCurrentInputLocked(int flags) {
        if ((flags&InputMethodManager.HIDE_IMPLICIT_ONLY) != 0
                && (mShowExplicitlyRequested || mShowForced)) {
            if (DEBUG) Log.v(TAG,
                    "Not hiding: explicit show not cancelled by non-explicit hide");
            return;
        }
        if (mShowForced && (flags&InputMethodManager.HIDE_NOT_ALWAYS) != 0) {
            if (DEBUG) Log.v(TAG,
                    "Not hiding: forced show not cancelled by not-always hide");
            return;
        }
        if (mInputShown && mCurMethod != null) {
            executeOrSendMessage(mCurMethod, mCaller.obtainMessageO(
                    MSG_HIDE_SOFT_INPUT, mCurMethod));
        }
        mInputShown = false;
        mShowRequested = false;
        mShowExplicitlyRequested = false;
        mShowForced = false;
    }
    
    public void windowGainedFocus(IInputMethodClient client,
            boolean viewHasFocus, boolean isTextEditor, int softInputMode,
            boolean first, int windowFlags) {
        synchronized (mMethodMap) {
            if (DEBUG) Log.v(TAG, "windowGainedFocus: " + client.asBinder()
                    + " viewHasFocus=" + viewHasFocus
                    + " isTextEditor=" + isTextEditor
                    + " softInputMode=#" + Integer.toHexString(softInputMode)
                    + " first=" + first + " flags=#"
                    + Integer.toHexString(windowFlags));
            
            if (mCurClient == null || client == null
                    || mCurClient.client.asBinder() != client.asBinder()) {
                try {
                    // We need to check if this is the current client with
                    // focus in the window manager, to allow this call to
                    // be made before input is started in it.
                    if (!mIWindowManager.inputMethodClientHasFocus(client)) {
                        Log.w(TAG, "Ignoring focus gain of: " + client);
                        return;
                    }
                } catch (RemoteException e) {
                }
            }

            switch (softInputMode&WindowManager.LayoutParams.SOFT_INPUT_MASK_STATE) {
                case WindowManager.LayoutParams.SOFT_INPUT_STATE_UNSPECIFIED:
                    if (!isTextEditor || (softInputMode &
                            WindowManager.LayoutParams.SOFT_INPUT_MASK_ADJUST)
                            != WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE) {
                        if (WindowManager.LayoutParams.mayUseInputMethod(windowFlags)) {
                            // There is no focus view, and this window will
                            // be behind any soft input window, so hide the
                            // soft input window if it is shown.
                            if (DEBUG) Log.v(TAG, "Unspecified window will hide input");
                            hideCurrentInputLocked(InputMethodManager.HIDE_NOT_ALWAYS);
                        }
                    } else if (isTextEditor && (softInputMode &
                            WindowManager.LayoutParams.SOFT_INPUT_MASK_ADJUST)
                            == WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE
                            && (softInputMode &
                                    WindowManager.LayoutParams.SOFT_INPUT_IS_FORWARD_NAVIGATION) != 0) {
                        // There is a focus view, and we are navigating forward
                        // into the window, so show the input window for the user.
                        if (DEBUG) Log.v(TAG, "Unspecified window will show input");
                        showCurrentInputLocked(InputMethodManager.SHOW_IMPLICIT);
                    }
                    break;
                case WindowManager.LayoutParams.SOFT_INPUT_STATE_UNCHANGED:
                    // Do nothing.
                    break;
                case WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN:
                    if (DEBUG) Log.v(TAG, "Window asks to hide input");
                    hideCurrentInputLocked(0);
                    break;
                case WindowManager.LayoutParams.SOFT_INPUT_STATE_VISIBLE:
                    if ((softInputMode &
                            WindowManager.LayoutParams.SOFT_INPUT_IS_FORWARD_NAVIGATION) != 0) {
                        if (DEBUG) Log.v(TAG, "Window asks to show input going forward");
                        showCurrentInputLocked(InputMethodManager.SHOW_IMPLICIT);
                    }
                    break;
                case WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE:
                    if (DEBUG) Log.v(TAG, "Window asks to always show input");
                    showCurrentInputLocked(InputMethodManager.SHOW_IMPLICIT);
                    break;
            }
        }
    }
    
    public void showInputMethodPickerFromClient(IInputMethodClient client) {
        synchronized (mMethodMap) {
            if (mCurClient == null || client == null
                    || mCurClient.client.asBinder() != client.asBinder()) {
                Log.w(TAG, "Ignoring showInputMethodDialogFromClient of: " + client);
            }

            mHandler.sendEmptyMessage(MSG_SHOW_IM_PICKER);
        }
    }

    public void setInputMethod(IBinder token, String id) {
        synchronized (mMethodMap) {
            if (mCurToken == null) {
                if (mContext.checkCallingOrSelfPermission(
                        android.Manifest.permission.WRITE_SECURE_SETTINGS)
                        != PackageManager.PERMISSION_GRANTED) {
                    throw new SecurityException(
                            "Using null token requires permission "
                            + android.Manifest.permission.WRITE_SECURE_SETTINGS);
                }
            } else if (mCurToken != token) {
                Log.w(TAG, "Ignoring setInputMethod of token: " + token);
            }

            setInputMethodLocked(id);
        }
    }

    public void hideMySoftInput(IBinder token, int flags) {
        synchronized (mMethodMap) {
            if (mCurToken == null || mCurToken != token) {
                Log.w(TAG, "Ignoring hideInputMethod of token: " + token);
            }

            hideCurrentInputLocked(flags);
        }
    }

    void setEnabledSessionInMainThread(SessionState session) {
        if (mEnabledSession != session) {
            if (mEnabledSession != null) {
                try {
                    if (DEBUG) Log.v(TAG, "Disabling: " + mEnabledSession);
                    mEnabledSession.method.setSessionEnabled(
                            mEnabledSession.session, false);
                } catch (RemoteException e) {
                }
            }
            mEnabledSession = session;
            try {
                if (DEBUG) Log.v(TAG, "Enabling: " + mEnabledSession);
                session.method.setSessionEnabled(
                        session.session, true);
            } catch (RemoteException e) {
            }
        }
    }
    
    public boolean handleMessage(Message msg) {
        HandlerCaller.SomeArgs args;
        switch (msg.what) {
            case MSG_SHOW_IM_PICKER:
                showInputMethodMenu();
                return true;
            
            // ---------------------------------------------------------
                
            case MSG_UNBIND_INPUT:
                try {
                    ((IInputMethod)msg.obj).unbindInput();
                } catch (RemoteException e) {
                    // There is nothing interesting about the method dying.
                }
                return true;
            case MSG_BIND_INPUT:
                args = (HandlerCaller.SomeArgs)msg.obj;
                try {
                    ((IInputMethod)args.arg1).bindInput((InputBinding)args.arg2);
                } catch (RemoteException e) {
                }
                return true;
            case MSG_SHOW_SOFT_INPUT:
                try {
                    ((IInputMethod)msg.obj).showSoftInput(msg.arg1);
                } catch (RemoteException e) {
                }
                return true;
            case MSG_HIDE_SOFT_INPUT:
                try {
                    ((IInputMethod)msg.obj).hideSoftInput();
                } catch (RemoteException e) {
                }
                return true;
            case MSG_ATTACH_TOKEN:
                args = (HandlerCaller.SomeArgs)msg.obj;
                try {
                    if (DEBUG) Log.v(TAG, "Sending attach of token: " + args.arg2);
                    ((IInputMethod)args.arg1).attachToken((IBinder)args.arg2);
                } catch (RemoteException e) {
                }
                return true;
            case MSG_CREATE_SESSION:
                args = (HandlerCaller.SomeArgs)msg.obj;
                try {
                    ((IInputMethod)args.arg1).createSession(
                            (IInputMethodCallback)args.arg2);
                } catch (RemoteException e) {
                }
                return true;
                
            // ---------------------------------------------------------
                
            case MSG_START_INPUT:
                args = (HandlerCaller.SomeArgs)msg.obj;
                try {
                    SessionState session = (SessionState)args.arg1;
                    setEnabledSessionInMainThread(session);
                    session.method.startInput((IInputContext)args.arg2,
                            (EditorInfo)args.arg3);
                } catch (RemoteException e) {
                }
                return true;
            case MSG_RESTART_INPUT:
                args = (HandlerCaller.SomeArgs)msg.obj;
                try {
                    SessionState session = (SessionState)args.arg1;
                    setEnabledSessionInMainThread(session);
                    session.method.restartInput((IInputContext)args.arg2,
                            (EditorInfo)args.arg3);
                } catch (RemoteException e) {
                }
                return true;
                
            // ---------------------------------------------------------
                
            case MSG_UNBIND_METHOD:
                try {
                    ((IInputMethodClient)msg.obj).onUnbindMethod(msg.arg1);
                } catch (RemoteException e) {
                    // There is nothing interesting about the last client dying.
                }
                return true;
            case MSG_BIND_METHOD:
                args = (HandlerCaller.SomeArgs)msg.obj;
                try {
                    ((IInputMethodClient)args.arg1).onBindMethod(
                            (InputBindResult)args.arg2);
                } catch (RemoteException e) {
                    Log.w(TAG, "Client died receiving input method " + args.arg2);
                }
                return true;
        }
        return false;
    }

    void buildInputMethodListLocked(ArrayList<InputMethodInfo> list,
            HashMap<String, InputMethodInfo> map) {
        list.clear();
        map.clear();
        
        PackageManager pm = mContext.getPackageManager();

        List<ResolveInfo> services = pm.queryIntentServices(
                new Intent(InputMethod.SERVICE_INTERFACE),
                PackageManager.GET_META_DATA);
        
        for (int i = 0; i < services.size(); ++i) {
            ResolveInfo ri = services.get(i);
            ServiceInfo si = ri.serviceInfo;
            ComponentName compName = new ComponentName(si.packageName, si.name);
            if (!android.Manifest.permission.BIND_INPUT_METHOD.equals(
                    si.permission)) {
                Log.w(TAG, "Skipping input method " + compName
                        + ": it does not require the permission "
                        + android.Manifest.permission.BIND_INPUT_METHOD);
                continue;
            }

            if (DEBUG) Log.d(TAG, "Checking " + compName);

            try {
                InputMethodInfo p = new InputMethodInfo(mContext, ri);
                list.add(p);
                map.put(p.getId(), p);

                if (DEBUG) {
                    Log.d(TAG, "Found a third-party input method " + p);
                }
                
            } catch (XmlPullParserException e) {
                Log.w(TAG, "Unable to load input method " + compName, e);
            } catch (IOException e) {
                Log.w(TAG, "Unable to load input method " + compName, e);
            }
        }
    }
    
    // ----------------------------------------------------------------------
    
    public void showInputMethodMenu() {
        if (DEBUG) Log.v(TAG, "Show switching menu");

        hideInputMethodMenu();
        
        final Context context = mContext;
        
        final PackageManager pm = context.getPackageManager();
        
        String lastInputMethodId = Settings.Secure.getString(context
                .getContentResolver(), Settings.Secure.DEFAULT_INPUT_METHOD);
        if (DEBUG) Log.v(TAG, "Current IME: " + lastInputMethodId);
        
        final List<InputMethodInfo> immis = getEnabledInputMethodList();
        
        int N = (immis == null ? 0 : immis.size());

        mItems = new CharSequence[N];
        mIms = new InputMethodInfo[N];

        for (int i = 0; i < N; ++i) {
            InputMethodInfo property = immis.get(i);
            mItems[i] = property.loadLabel(pm);
            mIms[i] = property;
        }

        int checkedItem = 0;
        for (int i = 0; i < N; ++i) {
            if (mIms[i].getId().equals(lastInputMethodId)) {
                checkedItem = i;
                break;
            }
        }

        AlertDialog.OnClickListener adocl = new AlertDialog.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                hideInputMethodMenu();
            }
        };
        
        TypedArray a = context.obtainStyledAttributes(null,
                com.android.internal.R.styleable.DialogPreference,
                com.android.internal.R.attr.alertDialogStyle, 0);
        mDialogBuilder = new AlertDialog.Builder(context)
                .setTitle(com.android.internal.R.string.select_input_method)
                .setOnCancelListener(new OnCancelListener() {
                    public void onCancel(DialogInterface dialog) {
                        hideInputMethodMenu();
                    }
                })
                .setIcon(a.getDrawable(
                        com.android.internal.R.styleable.DialogPreference_dialogTitle));
        a.recycle();
        
        mDialogBuilder.setSingleChoiceItems(mItems, checkedItem,
                new AlertDialog.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        synchronized (mMethodMap) {
                            InputMethodInfo im = mIms[which];
                            hideInputMethodMenu();
                            setInputMethodLocked(im.getId());
                        }
                    }
                });

        synchronized (mMethodMap) {
            mSwitchingDialog = mDialogBuilder.create();
            mSwitchingDialog.getWindow().setType(
                    WindowManager.LayoutParams.TYPE_INPUT_METHOD_DIALOG);
            mSwitchingDialog.show();
        }
    }
    
    void hideInputMethodMenu() {
        if (DEBUG) Log.v(TAG, "Hide switching menu");

        synchronized (mMethodMap) {
            if (mSwitchingDialog != null) {
                mSwitchingDialog.dismiss();
                mSwitchingDialog = null;
            }
            
            mDialogBuilder = null;
            mItems = null;
            mIms = null;
        }
    }
    
    // ----------------------------------------------------------------------
    
    public boolean setInputMethodEnabled(String id, boolean enabled) {
        synchronized (mMethodMap) {
            if (mContext.checkCallingOrSelfPermission(
                    android.Manifest.permission.WRITE_SECURE_SETTINGS)
                    != PackageManager.PERMISSION_GRANTED) {
                throw new SecurityException(
                        "Requires permission "
                        + android.Manifest.permission.WRITE_SECURE_SETTINGS);
            }
            
            // Make sure this is a valid input method.
            InputMethodInfo imm = mMethodMap.get(id);
            if (imm == null) {
                if (imm == null) {
                    throw new IllegalArgumentException("Unknown id: " + mCurMethodId);
                }
            }
            
            StringBuilder builder = new StringBuilder(256);
            
            boolean removed = false;
            String firstId = null;
            
            // Look through the currently enabled input methods.
            String enabledStr = Settings.Secure.getString(mContext.getContentResolver(),
                    Settings.Secure.ENABLED_INPUT_METHODS);
            if (enabledStr != null) {
                final TextUtils.SimpleStringSplitter splitter = mStringColonSplitter;
                splitter.setString(enabledStr);
                while (splitter.hasNext()) {
                    String curId = splitter.next();
                    if (curId.equals(id)) {
                        if (enabled) {
                            // We are enabling this input method, but it is
                            // already enabled.  Nothing to do.  The previous
                            // state was enabled.
                            return true;
                        }
                        // We are disabling this input method, and it is
                        // currently enabled.  Skip it to remove from the
                        // new list.
                        removed = true;
                    } else if (!enabled) {
                        // We are building a new list of input methods that
                        // doesn't contain the given one.
                        if (firstId == null) firstId = curId;
                        if (builder.length() > 0) builder.append(':');
                        builder.append(curId);
                    }
                }
            }
            
            if (!enabled) {
                if (!removed) {
                    // We are disabling the input method but it is already
                    // disabled.  Nothing to do.  The previous state was
                    // disabled.
                    return false;
                }
                // Update the setting with the new list of input methods.
                Settings.Secure.putString(mContext.getContentResolver(),
                        Settings.Secure.ENABLED_INPUT_METHODS, builder.toString());
                // We the disabled input method is currently selected, switch
                // to another one.
                String selId = Settings.Secure.getString(mContext.getContentResolver(),
                        Settings.Secure.DEFAULT_INPUT_METHOD);
                if (id.equals(selId)) {
                    Settings.Secure.putString(mContext.getContentResolver(),
                            Settings.Secure.DEFAULT_INPUT_METHOD,
                            firstId != null ? firstId : "");
                }
                // Previous state was enabled.
                return true;
            }
            
            // Add in the newly enabled input method.
            if (enabledStr == null || enabledStr.length() == 0) {
                enabledStr = id;
            } else {
                enabledStr = enabledStr + ':' + id;
            }
            
            Settings.Secure.putString(mContext.getContentResolver(),
                    Settings.Secure.ENABLED_INPUT_METHODS, enabledStr);
            
            // Previous state was disabled.
            return false;
        }
    }
    
    // ----------------------------------------------------------------------
    
    @Override
    protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
        if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.DUMP)
                != PackageManager.PERMISSION_GRANTED) {
            
            pw.println("Permission Denial: can't dump InputMethodManager from from pid="
                    + Binder.getCallingPid()
                    + ", uid=" + Binder.getCallingUid());
            return;
        }

        IInputMethod method;
        ClientState client;
        
        final Printer p = new PrintWriterPrinter(pw);
        
        synchronized (mMethodMap) {
            p.println("Current Input Method Manager state:");
            int N = mMethodList.size();
            p.println("  Input Methods:");
            for (int i=0; i<N; i++) {
                InputMethodInfo info = mMethodList.get(i);
                p.println("  InputMethod #" + i + ":");
                info.dump(p, "    ");
            }
            p.println("  Clients:");
            for (ClientState ci : mClients.values()) {
                p.println("  Client " + ci + ":");
                p.println("    client=" + ci.client);
                p.println("    inputContext=" + ci.inputContext);
                p.println("    sessionRequested=" + ci.sessionRequested);
                p.println("    curSession=" + ci.curSession);
            }
            p.println("  mInputMethodIcon=" + mInputMethodIcon);
            p.println("  mInputMethodData=" + mInputMethodData);
            p.println("  mCurrentMethod=" + mCurMethodId);
            client = mCurClient;
            p.println("  mCurSeq=" + mCurSeq + " mCurClient=" + client);
            p.println("  mCurId=" + mCurId + " mHaveConnect=" + mHaveConnection
                    + " mBoundToMethod=" + mBoundToMethod);
            p.println("  mCurToken=" + mCurToken);
            p.println("  mCurIntent=" + mCurIntent);
            method = mCurMethod;
            p.println("  mCurMethod=" + mCurMethod);
            p.println("  mEnabledSession=" + mEnabledSession);
            p.println("  mShowRequested=" + mShowRequested
                    + " mShowExplicitlyRequested=" + mShowExplicitlyRequested
                    + " mShowForced=" + mShowForced
                    + " mInputShown=" + mInputShown);
            p.println("  mScreenOn=" + mScreenOn);
        }
        
        if (client != null) {
            p.println(" ");
            pw.flush();
            try {
                client.client.asBinder().dump(fd, args);
            } catch (RemoteException e) {
                p.println("Input method client dead: " + e);
            }
        }
        
        if (method != null) {
            p.println(" ");
            pw.flush();
            try {
                method.asBinder().dump(fd, args);
            } catch (RemoteException e) {
                p.println("Input method service dead: " + e);
            }
        }
    }
}