/*
 * Copyright (C) 2010 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.util.XmlUtils;

import org.xmlpull.v1.XmlPullParser;

import android.content.Context;
import android.content.pm.PackageManager;
import android.content.res.Configuration;
import android.os.Environment;
import android.os.LocalPowerManager;
import android.os.PowerManager;
import android.util.Slog;
import android.util.Xml;
import android.view.InputChannel;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.Surface;
import android.view.WindowManagerPolicy;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.ArrayList;

/*
 * Wraps the C++ InputManager and provides its callbacks.
 * 
 * XXX Tempted to promote this to a first-class service, ie. InputManagerService, to
 *     improve separation of concerns with respect to the window manager.
 */
public class InputManager {
    static final String TAG = "InputManager";
    
    private final Callbacks mCallbacks;
    private final Context mContext;
    private final WindowManagerService mWindowManagerService;
    private final PowerManager mPowerManager;
    private final PowerManagerService mPowerManagerService;
    
    private int mTouchScreenConfig;
    private int mKeyboardConfig;
    private int mNavigationConfig;
    
    private static native void nativeInit(Callbacks callbacks);
    private static native void nativeStart();
    private static native void nativeSetDisplaySize(int displayId, int width, int height);
    private static native void nativeSetDisplayOrientation(int displayId, int rotation);
    
    private static native int nativeGetScanCodeState(int deviceId, int deviceClasses,
            int scanCode);
    private static native int nativeGetKeyCodeState(int deviceId, int deviceClasses,
            int keyCode);
    private static native int nativeGetSwitchState(int deviceId, int deviceClasses,
            int sw);
    private static native boolean nativeHasKeys(int[] keyCodes, boolean[] keyExists);
    private static native void nativeRegisterInputChannel(InputChannel inputChannel);
    private static native void nativeUnregisterInputChannel(InputChannel inputChannel);
    private static native int nativeInjectKeyEvent(KeyEvent event,
            int injectorPid, int injectorUid, boolean sync, int timeoutMillis);
    private static native int nativeInjectMotionEvent(MotionEvent event,
            int injectorPid, int injectorUid, boolean sync, int timeoutMillis);
    private static native void nativeSetInputWindows(InputWindow[] windows);
    private static native void nativeSetInputDispatchMode(boolean enabled, boolean frozen);
    private static native void nativeSetFocusedApplication(InputApplication application);
    private static native void nativePreemptInputDispatch();
    
    // Device class as defined by EventHub.
    private static final int CLASS_KEYBOARD = 0x00000001;
    private static final int CLASS_ALPHAKEY = 0x00000002;
    private static final int CLASS_TOUCHSCREEN = 0x00000004;
    private static final int CLASS_TRACKBALL = 0x00000008;
    private static final int CLASS_TOUCHSCREEN_MT = 0x00000010;
    private static final int CLASS_DPAD = 0x00000020;
    
    // Input event injection constants defined in InputDispatcher.h.
    static final int INPUT_EVENT_INJECTION_SUCCEEDED = 0;
    static final int INPUT_EVENT_INJECTION_PERMISSION_DENIED = 1;
    static final int INPUT_EVENT_INJECTION_FAILED = 2;
    static final int INPUT_EVENT_INJECTION_TIMED_OUT = 3;
    
    public InputManager(Context context,
            WindowManagerService windowManagerService,
            PowerManager powerManager,
            PowerManagerService powerManagerService) {
        this.mContext = context;
        this.mWindowManagerService = windowManagerService;
        this.mPowerManager = powerManager;
        this.mPowerManagerService = powerManagerService;
        
        this.mCallbacks = new Callbacks();
        
        mTouchScreenConfig = Configuration.TOUCHSCREEN_NOTOUCH;
        mKeyboardConfig = Configuration.KEYBOARD_NOKEYS;
        mNavigationConfig = Configuration.NAVIGATION_NONAV;
        
        init();
    }
    
    private void init() {
        Slog.i(TAG, "Initializing input manager");
        nativeInit(mCallbacks);
    }
    
    public void start() {
        Slog.i(TAG, "Starting input manager");
        nativeStart();
    }
    
    public void setDisplaySize(int displayId, int width, int height) {
        if (width <= 0 || height <= 0) {
            throw new IllegalArgumentException("Invalid display id or dimensions.");
        }
        
        Slog.i(TAG, "Setting display #" + displayId + " size to " + width + "x" + height);
        nativeSetDisplaySize(displayId, width, height);
    }
    
    public void setDisplayOrientation(int displayId, int rotation) {
        if (rotation < Surface.ROTATION_0 || rotation > Surface.ROTATION_270) {
            throw new IllegalArgumentException("Invalid rotation.");
        }
        
        Slog.i(TAG, "Setting display #" + displayId + " orientation to " + rotation);
        nativeSetDisplayOrientation(displayId, rotation);
    }
    
    public void getInputConfiguration(Configuration config) {
        if (config == null) {
            throw new IllegalArgumentException("config must not be null.");
        }
        
        config.touchscreen = mTouchScreenConfig;
        config.keyboard = mKeyboardConfig;
        config.navigation = mNavigationConfig;
    }
    
    public int getScancodeState(int code) {
        return nativeGetScanCodeState(0, -1, code);
    }
    
    public int getScancodeState(int deviceId, int code) {
        return nativeGetScanCodeState(deviceId, -1, code);
    }
    
    public int getTrackballScancodeState(int code) {
        return nativeGetScanCodeState(-1, CLASS_TRACKBALL, code);
    }
    
    public int getDPadScancodeState(int code) {
        return nativeGetScanCodeState(-1, CLASS_DPAD, code);
    }
    
    public int getKeycodeState(int code) {
        return nativeGetKeyCodeState(0, -1, code);
    }
    
    public int getKeycodeState(int deviceId, int code) {
        return nativeGetKeyCodeState(deviceId, -1, code);
    }
    
    public int getTrackballKeycodeState(int code) {
        return nativeGetKeyCodeState(-1, CLASS_TRACKBALL, code);
    }
    
    public int getDPadKeycodeState(int code) {
        return nativeGetKeyCodeState(-1, CLASS_DPAD, code);
    }

    public int getSwitchState(int sw) {
        return nativeGetSwitchState(-1, -1, sw);
    }
    
    public int getSwitchState(int deviceId, int sw) {
        return nativeGetSwitchState(deviceId, -1, sw);
    }

    public boolean hasKeys(int[] keyCodes, boolean[] keyExists) {
        if (keyCodes == null) {
            throw new IllegalArgumentException("keyCodes must not be null.");
        }
        if (keyExists == null) {
            throw new IllegalArgumentException("keyExists must not be null.");
        }
        
        return nativeHasKeys(keyCodes, keyExists);
    }
    
    public void registerInputChannel(InputChannel inputChannel) {
        if (inputChannel == null) {
            throw new IllegalArgumentException("inputChannel must not be null.");
        }
        
        nativeRegisterInputChannel(inputChannel);
    }
    
    public void unregisterInputChannel(InputChannel inputChannel) {
        if (inputChannel == null) {
            throw new IllegalArgumentException("inputChannel must not be null.");
        }
        
        nativeUnregisterInputChannel(inputChannel);
    }
    
    /**
     * Injects a key event into the event system on behalf of an application.
     * This method may block even if sync is false because it must wait for previous events
     * to be dispatched before it can determine whether input event injection will be
     * permitted based on the current input focus.
     * @param event The event to inject.
     * @param injectorPid The pid of the injecting application.
     * @param injectorUid The uid of the injecting application.
     * @param sync If true, waits for the event to be completed before returning.
     * @param timeoutMillis The injection timeout in milliseconds.
     * @return One of the INPUT_EVENT_INJECTION_XXX constants.
     */
    public int injectKeyEvent(KeyEvent event, int injectorPid, int injectorUid,
            boolean sync, int timeoutMillis) {
        if (event == null) {
            throw new IllegalArgumentException("event must not be null");
        }
        if (injectorPid < 0 || injectorUid < 0) {
            throw new IllegalArgumentException("injectorPid and injectorUid must not be negative.");
        }
        if (timeoutMillis <= 0) {
            throw new IllegalArgumentException("timeoutMillis must be positive");
        }
        
        return nativeInjectKeyEvent(event, injectorPid, injectorUid,
                sync, timeoutMillis);
    }
    
    /**
     * Injects a motion event into the event system on behalf of an application.
     * This method may block even if sync is false because it must wait for previous events
     * to be dispatched before it can determine whether input event injection will be
     * permitted based on the current input focus.
     * @param event The event to inject.
     * @param sync If true, waits for the event to be completed before returning.
     * @param injectorPid The pid of the injecting application.
     * @param injectorUid The uid of the injecting application.
     * @param sync If true, waits for the event to be completed before returning.
     * @param timeoutMillis The injection timeout in milliseconds.
     * @return One of the INPUT_EVENT_INJECTION_XXX constants.
     */
    public int injectMotionEvent(MotionEvent event, int injectorPid, int injectorUid,
            boolean sync, int timeoutMillis) {
        if (event == null) {
            throw new IllegalArgumentException("event must not be null");
        }
        if (injectorPid < 0 || injectorUid < 0) {
            throw new IllegalArgumentException("injectorPid and injectorUid must not be negative.");
        }
        if (timeoutMillis <= 0) {
            throw new IllegalArgumentException("timeoutMillis must be positive");
        }
        
        return nativeInjectMotionEvent(event, injectorPid, injectorUid,
                sync, timeoutMillis);
    }
    
    public void setInputWindows(InputWindow[] windows) {
        nativeSetInputWindows(windows);
    }
    
    public void setFocusedApplication(InputApplication application) {
        nativeSetFocusedApplication(application);
    }
    
    public void preemptInputDispatch() {
        nativePreemptInputDispatch();
    }
    
    public void setInputDispatchMode(boolean enabled, boolean frozen) {
        nativeSetInputDispatchMode(enabled, frozen);
    }
    
    public void dump(PrintWriter pw) {
        // TODO
    }
    
    private static final class VirtualKeyDefinition {
        public int scanCode;
        
        // configured position data, specified in display coords
        public int centerX;
        public int centerY;
        public int width;
        public int height;
    }
    
    /*
     * Callbacks from native.
     */
    private class Callbacks {
        static final String TAG = "InputManager-Callbacks";
        
        private static final boolean DEBUG_VIRTUAL_KEYS = false;
        private static final String EXCLUDED_DEVICES_PATH = "etc/excluded-input-devices.xml";
        
        @SuppressWarnings("unused")
        public void virtualKeyDownFeedback() {
            mWindowManagerService.mInputMonitor.virtualKeyDownFeedback();
        }
        
        @SuppressWarnings("unused")
        public void notifyConfigurationChanged(long whenNanos,
                int touchScreenConfig, int keyboardConfig, int navigationConfig) {
            mTouchScreenConfig = touchScreenConfig;
            mKeyboardConfig = keyboardConfig;
            mNavigationConfig = navigationConfig;
            
            mWindowManagerService.sendNewConfiguration();
        }
        
        @SuppressWarnings("unused")
        public void notifyLidSwitchChanged(long whenNanos, boolean lidOpen) {
            mWindowManagerService.mInputMonitor.notifyLidSwitchChanged(whenNanos, lidOpen);
        }
        
        @SuppressWarnings("unused")
        public void notifyInputChannelBroken(InputChannel inputChannel) {
            mWindowManagerService.mInputMonitor.notifyInputChannelBroken(inputChannel);
        }

        @SuppressWarnings("unused")
        public long notifyInputChannelANR(InputChannel inputChannel) {
            return mWindowManagerService.mInputMonitor.notifyInputChannelANR(inputChannel);
        }

        @SuppressWarnings("unused")
        public void notifyInputChannelRecoveredFromANR(InputChannel inputChannel) {
            mWindowManagerService.mInputMonitor.notifyInputChannelRecoveredFromANR(inputChannel);
        }
        
        @SuppressWarnings("unused")
        public long notifyANR(Object token) {
            return mWindowManagerService.mInputMonitor.notifyANR(token);
        }
        
        @SuppressWarnings("unused")
        public int interceptKeyBeforeQueueing(long whenNanos, int keyCode, boolean down,
                int policyFlags, boolean isScreenOn) {
            return mWindowManagerService.mInputMonitor.interceptKeyBeforeQueueing(
                    whenNanos, keyCode, down, policyFlags, isScreenOn);
        }
        
        @SuppressWarnings("unused")
        public boolean interceptKeyBeforeDispatching(InputChannel focus, int action,
                int flags, int keyCode, int metaState, int repeatCount, int policyFlags) {
            return mWindowManagerService.mInputMonitor.interceptKeyBeforeDispatching(focus,
                    action, flags, keyCode, metaState, repeatCount, policyFlags);
        }
        
        @SuppressWarnings("unused")
        public boolean checkInjectEventsPermission(int injectorPid, int injectorUid) {
            return mContext.checkPermission(
                    android.Manifest.permission.INJECT_EVENTS, injectorPid, injectorUid)
                    == PackageManager.PERMISSION_GRANTED;
        }
        
        @SuppressWarnings("unused")
        public void notifyAppSwitchComing() {
            mWindowManagerService.mInputMonitor.notifyAppSwitchComing();
        }
        
        @SuppressWarnings("unused")
        public boolean filterTouchEvents() {
            return mContext.getResources().getBoolean(
                    com.android.internal.R.bool.config_filterTouchEvents);
        }
        
        @SuppressWarnings("unused")
        public boolean filterJumpyTouchEvents() {
            return mContext.getResources().getBoolean(
                    com.android.internal.R.bool.config_filterJumpyTouchEvents);
        }
        
        @SuppressWarnings("unused")
        public VirtualKeyDefinition[] getVirtualKeyDefinitions(String deviceName) {
            ArrayList<VirtualKeyDefinition> keys = new ArrayList<VirtualKeyDefinition>();
            
            try {
                FileInputStream fis = new FileInputStream(
                        "/sys/board_properties/virtualkeys." + deviceName);
                InputStreamReader isr = new InputStreamReader(fis);
                BufferedReader br = new BufferedReader(isr, 2048);
                String str = br.readLine();
                if (str != null) {
                    String[] it = str.split(":");
                    if (DEBUG_VIRTUAL_KEYS) Slog.v(TAG, "***** VIRTUAL KEYS: " + it);
                    final int N = it.length-6;
                    for (int i=0; i<=N; i+=6) {
                        if (!"0x01".equals(it[i])) {
                            Slog.w(TAG, "Unknown virtual key type at elem #" + i
                                    + ": " + it[i]);
                            continue;
                        }
                        try {
                            VirtualKeyDefinition key = new VirtualKeyDefinition();
                            key.scanCode = Integer.parseInt(it[i+1]);
                            key.centerX = Integer.parseInt(it[i+2]);
                            key.centerY = Integer.parseInt(it[i+3]);
                            key.width = Integer.parseInt(it[i+4]);
                            key.height = Integer.parseInt(it[i+5]);
                            if (DEBUG_VIRTUAL_KEYS) Slog.v(TAG, "Virtual key "
                                    + key.scanCode + ": center=" + key.centerX + ","
                                    + key.centerY + " size=" + key.width + "x"
                                    + key.height);
                            keys.add(key);
                        } catch (NumberFormatException e) {
                            Slog.w(TAG, "Bad number at region " + i + " in: "
                                    + str, e);
                        }
                    }
                }
                br.close();
            } catch (FileNotFoundException e) {
                Slog.i(TAG, "No virtual keys found");
            } catch (IOException e) {
                Slog.w(TAG, "Error reading virtual keys", e);
            }
            
            return keys.toArray(new VirtualKeyDefinition[keys.size()]);
        }
        
        @SuppressWarnings("unused")
        public String[] getExcludedDeviceNames() {
            ArrayList<String> names = new ArrayList<String>();
            
            // Read partner-provided list of excluded input devices
            XmlPullParser parser = null;
            // Environment.getRootDirectory() is a fancy way of saying ANDROID_ROOT or "/system".
            File confFile = new File(Environment.getRootDirectory(), EXCLUDED_DEVICES_PATH);
            FileReader confreader = null;
            try {
                confreader = new FileReader(confFile);
                parser = Xml.newPullParser();
                parser.setInput(confreader);
                XmlUtils.beginDocument(parser, "devices");

                while (true) {
                    XmlUtils.nextElement(parser);
                    if (!"device".equals(parser.getName())) {
                        break;
                    }
                    String name = parser.getAttributeValue(null, "name");
                    if (name != null) {
                        names.add(name);
                    }
                }
            } catch (FileNotFoundException e) {
                // It's ok if the file does not exist.
            } catch (Exception e) {
                Slog.e(TAG, "Exception while parsing '" + confFile.getAbsolutePath() + "'", e);
            } finally {
                try { if (confreader != null) confreader.close(); } catch (IOException e) { }
            }
            
            return names.toArray(new String[names.size()]);
        }
    }
}