/*
 * Copyright (C) 2008-2009 Google Inc.
 * 
 * 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.marvin.circleime;

import com.google.tts.TextToSpeechBeta;

import android.content.res.Configuration;
import android.inputmethodservice.InputMethodService;
import android.inputmethodservice.Keyboard;
import android.inputmethodservice.KeyboardView;
import android.text.method.MetaKeyKeyListener;
import android.util.Log;
import android.view.KeyCharacterMap;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.view.inputmethod.CompletionInfo;
import android.view.inputmethod.EditorInfo;
import android.view.inputmethod.InputConnection;
import android.view.inputmethod.InputMethodManager;
import android.widget.FrameLayout;

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

/**
 * Example of writing an input method for a soft keyboard. This code is focused
 * on simplicity over completeness, so it should in no way be considered to be a
 * complete soft keyboard implementation. Its purpose is to provide a basic
 * example for how you would get started writing an input method, to be fleshed
 * out as appropriate.
 */
public class SoftKeyboard extends InputMethodService implements
        KeyboardView.OnKeyboardActionListener {
    static final boolean DEBUG = false;

    /**
     * This boolean indicates the optional example code for performing
     * processing of hard keys in addition to regular text generation from
     * on-screen interaction. It would be used for input methods that perform
     * language translations (such as converting text entered on a QWERTY
     * keyboard to Chinese), but may not be used for input methods that are
     * primarily intended to be used for on-screen text entry.
     */
    static final boolean PROCESS_HARD_KEYS = true;

    private KeyboardView mInputView;

    private CandidateView mCandidateView;

    private CompletionInfo[] mCompletions;

    private StringBuilder mComposing = new StringBuilder();

    private boolean mPredictionOn;

    private boolean mCompletionOn;

    private int mLastDisplayWidth;

    private boolean mCapsLock;

    private long mLastShiftTime;

    private long mMetaState;

    private LatinKeyboard mSymbolsKeyboard;

    private LatinKeyboard mSymbolsShiftedKeyboard;

    private LatinKeyboard mQwertyKeyboard;

    private LatinKeyboard mCurKeyboard;

    private String mWordSeparators;

    public TextToSpeechBeta mTts;

    /**
     * Main initialization of the input method component. Be sure to call to
     * super class.
     */

    @Override
    public void onCreate() {
        super.onCreate();
        mWordSeparators = getResources().getString(R.string.word_separators);
        mTts = new TextToSpeechBeta(this, null);
    }

    @Override
    public void onDestroy() {
        if (mTts != null) {
            mTts.shutdown();
        }
        super.onDestroy();
    }

    /**
     * This is the point where you can do all of your UI initialization. It is
     * called after creation and any configuration change.
     */
    @Override
    public void onInitializeInterface() {
        if (mQwertyKeyboard != null) {
            // Configuration changes can happen after the keyboard gets
            // recreated,
            // so we need to be able to re-build the keyboards if the available
            // space has changed.
            int displayWidth = getMaxWidth();
            if (displayWidth == mLastDisplayWidth)
                return;
            mLastDisplayWidth = displayWidth;
        }
        mQwertyKeyboard = new LatinKeyboard(this, R.xml.qwerty);
        mSymbolsKeyboard = new LatinKeyboard(this, R.xml.symbols);
        mSymbolsShiftedKeyboard = new LatinKeyboard(this, R.xml.symbols_shift);
    }

    /**
     * Called by the framework when your view for creating input needs to be
     * generated. This will be called the first time your input method is
     * displayed, and every time it needs to be re-created such as due to a
     * configuration change.
     */
    @Override
    public View onCreateInputView() {
        mInputView = (KeyboardView) getLayoutInflater().inflate(R.layout.input, null);
        mInputView.setOnKeyboardActionListener(this);
        mInputView.setKeyboard(mQwertyKeyboard);
        return mInputView;
    }

    /**
     * Called by the framework when your view for showing candidates needs to be
     * generated, like {@link #onCreateInputView}.
     */
    @Override
    public View onCreateCandidatesView() {
        return null;
    }

    /**
     * This is the main point where we do our initialization of the input method
     * to begin operating on an application. At this point we have been bound to
     * the client, and are now receiving all of the detailed information about
     * the target of our edits.
     */
    @Override
    public void onStartInput(EditorInfo attribute, boolean restarting) {
        super.onStartInput(attribute, restarting);

        // Reset our state. We want to do this even if restarting, because
        // the underlying state of the text editor could have changed in any
        // way.
        mComposing.setLength(0);
        updateCandidates();

        if (!restarting) {
            // Clear shift states.
            mMetaState = 0;
        }

        mPredictionOn = false;
        mCompletionOn = false;
        mCompletions = null;

        // We are now going to initialize our state based on the type of
        // text being edited.
        switch (attribute.inputType & EditorInfo.TYPE_MASK_CLASS) {
            case EditorInfo.TYPE_CLASS_NUMBER:
            case EditorInfo.TYPE_CLASS_DATETIME:
                // Numbers and dates default to the symbols keyboard, with
                // no extra features.
                mCurKeyboard = mSymbolsKeyboard;
                break;

            case EditorInfo.TYPE_CLASS_PHONE:
                // Phones will also default to the symbols keyboard, though
                // often you will want to have a dedicated phone keyboard.
                mCurKeyboard = mSymbolsKeyboard;
                break;

            case EditorInfo.TYPE_CLASS_TEXT:
                // This is general text editing. We will default to the
                // normal alphabetic keyboard, and assume that we should
                // be doing predictive text (showing candidates as the
                // user types).
                mCurKeyboard = mQwertyKeyboard;
                mPredictionOn = true;

                // We now look for a few special variations of text that will
                // modify our behavior.
                int variation = attribute.inputType & EditorInfo.TYPE_MASK_VARIATION;
                if (variation == EditorInfo.TYPE_TEXT_VARIATION_PASSWORD
                        || variation == EditorInfo.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD) {
                    // Do not display predictions / what the user is typing
                    // when they are entering a password.
                    mPredictionOn = false;
                }

                if (variation == EditorInfo.TYPE_TEXT_VARIATION_EMAIL_ADDRESS
                        || variation == EditorInfo.TYPE_TEXT_VARIATION_URI
                        || variation == EditorInfo.TYPE_TEXT_VARIATION_FILTER) {
                    // Our predictions are not useful for e-mail addresses
                    // or URIs.
                    mPredictionOn = false;
                }

                if ((attribute.inputType & EditorInfo.TYPE_TEXT_FLAG_AUTO_COMPLETE) != 0) {
                    // If this is an auto-complete text view, then our
                    // predictions
                    // will not be shown and instead we will allow the editor
                    // to supply their own. We only show the editor's
                    // candidates when in fullscreen mode, otherwise relying
                    // own it displaying its own UI.
                    mPredictionOn = false;
                    mCompletionOn = isFullscreenMode();
                }

                // We also want to look at the current state of the editor
                // to decide whether our alphabetic keyboard should start out
                // shifted.
                updateShiftKeyState(attribute);
                break;

            default:
                // For all unknown input types, default to the alphabetic
                // keyboard with no special features.
                mCurKeyboard = mQwertyKeyboard;
                updateShiftKeyState(attribute);
        }

        // Update the label on the enter key, depending on what the application
        // says it will do.
        mCurKeyboard.setImeOptions(getResources(), attribute.imeOptions);
    }

    /**
     * This is called when the user is done editing a field. We can use this to
     * reset our state.
     */
    @Override
    public void onFinishInput() {
        super.onFinishInput();

        // Clear current composing text and candidates.
        mComposing.setLength(0);
        updateCandidates();

        // We only hide the candidates window when finishing input on
        // a particular editor, to avoid popping the underlying application
        // up and down if the user is entering text into the bottom of
        // its window.
        setCandidatesViewShown(false);

        mCurKeyboard = mQwertyKeyboard;
        if (mInputView != null) {
            mInputView.closing();
        }
    }

    @Override
    public void onStartInputView(EditorInfo attribute, boolean restarting) {
        super.onStartInputView(attribute, restarting);
        // Apply the selected keyboard to the input view.
        mInputView.setKeyboard(mCurKeyboard);
        mInputView.closing();
    }

    /**
     * Deal with the editor reporting movement of its cursor.
     */
    @Override
    public void onUpdateSelection(int oldSelStart, int oldSelEnd, int newSelStart, int newSelEnd,
            int candidatesStart, int candidatesEnd) {
        super.onUpdateSelection(oldSelStart, oldSelEnd, newSelStart, newSelEnd, candidatesStart,
                candidatesEnd);

        // If the current selection in the text view changes, we should
        // clear whatever candidate text we have.
        if (mComposing.length() > 0 && (newSelStart != candidatesEnd || newSelEnd != candidatesEnd)) {
            mComposing.setLength(0);
            updateCandidates();
            InputConnection ic = getCurrentInputConnection();
            if (ic != null) {
                ic.finishComposingText();
            }
        }
    }

    /**
     * This tells us about completions that the editor has determined based on
     * the current text in it. We want to use this in fullscreen mode to show
     * the completions ourself, since the editor can not be seen in that
     * situation.
     */
    @Override
    public void onDisplayCompletions(CompletionInfo[] completions) {
        if (mCompletionOn) {
            mCompletions = completions;
            if (completions == null) {
                setSuggestions(null, false, false);
                return;
            }

            List<String> stringList = new ArrayList<String>();
            for (int i = 0; i < (completions != null ? completions.length : 0); i++) {
                CompletionInfo ci = completions[i];
                if ((ci != null) && (ci.getText() != null))
                    stringList.add(ci.getText().toString());
            }
            setSuggestions(stringList, true, true);
        }
    }

    /**
     * This translates incoming hard key events in to edit operations on an
     * InputConnection. It is only needed when using the PROCESS_HARD_KEYS
     * option.
     */
    private boolean translateKeyDown(int keyCode, KeyEvent event) {
        mMetaState = MetaKeyKeyListener.handleKeyDown(mMetaState, keyCode, event);
        int c = event.getUnicodeChar(MetaKeyKeyListener.getMetaState(mMetaState));
        mMetaState = MetaKeyKeyListener.adjustMetaAfterKeypress(mMetaState);
        InputConnection ic = getCurrentInputConnection();
        if (c == 0 || ic == null) {
            return false;
        }

        boolean dead = false;

        if ((c & KeyCharacterMap.COMBINING_ACCENT) != 0) {
            dead = true;
            c = c & KeyCharacterMap.COMBINING_ACCENT_MASK;
        }

        if (mComposing.length() > 0) {
            char accent = mComposing.charAt(mComposing.length() - 1);
            int composed = KeyEvent.getDeadChar(accent, c);

            if (composed != 0) {
                c = composed;
                mComposing.setLength(mComposing.length() - 1);
            }
        }

        onKey(c, null);

        return true;
    }

    /**
     * Use this to monitor key events being delivered to the application. We get
     * first crack at them, and can either resume them or let them continue to
     * the app.
     */
    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        switch (keyCode) {
            // Use search as an alternate enter key
            case KeyEvent.KEYCODE_SEARCH:
                this.sendDefaultEditorAction(false);
                return true;
                
            // TODO: Use menu as a "safer" way to dismiss the IME                            
            case KeyEvent.KEYCODE_MENU:
                Log.e("menu hit", "0");
                return true;
                            
            case KeyEvent.KEYCODE_BACK:
                // The InputMethodService already takes care of the back
                // key for us, to dismiss the input method if it is shown.
                // However, our keyboard could be showing a pop-up window
                // that back should dismiss, so we first allow it to do that.
                if (event.getRepeatCount() == 0 && mInputView != null) {
                    if (mInputView.handleBack()) {
                        return true;
                    }
                }
                break;

            case KeyEvent.KEYCODE_DEL:
                // Special handling of the delete key: if we currently are
                // composing text for the user, we want to modify that instead
                // of let the application to the delete itself.
                if (mComposing.length() > 0) {
                    onKey(Keyboard.KEYCODE_DELETE, null);
                    return true;
                }
                break;

            case KeyEvent.KEYCODE_ENTER:
                // Let the underlying text editor always handle these.
                return false;

            default:
                // For all other keys, if we want to do transformations on
                // text being entered with a hard keyboard, we need to process
                // it and do the appropriate action.
                if (PROCESS_HARD_KEYS) {
                    if (keyCode == KeyEvent.KEYCODE_SPACE
                            && (event.getMetaState() & KeyEvent.META_ALT_ON) != 0) {
                        // A silly example: in our input method, Alt+Space
                        // is a shortcut for 'android' in lower case.
                        InputConnection ic = getCurrentInputConnection();
                        if (ic != null) {
                            // First, tell the editor that it is no longer in
                            // the
                            // shift state, since we are consuming this.
                            ic.clearMetaKeyStates(KeyEvent.META_ALT_ON);
                            keyDownUp(KeyEvent.KEYCODE_A);
                            keyDownUp(KeyEvent.KEYCODE_N);
                            keyDownUp(KeyEvent.KEYCODE_D);
                            keyDownUp(KeyEvent.KEYCODE_R);
                            keyDownUp(KeyEvent.KEYCODE_O);
                            keyDownUp(KeyEvent.KEYCODE_I);
                            keyDownUp(KeyEvent.KEYCODE_D);
                            // And we consume this event.
                            return true;
                        }
                    }
                    if (mPredictionOn && translateKeyDown(keyCode, event)) {
                        return true;
                    }
                }
        }

        return super.onKeyDown(keyCode, event);
    }

    /**
     * Use this to monitor key events being delivered to the application. We get
     * first crack at them, and can either resume them or let them continue to
     * the app.
     */
    @Override
    public boolean onKeyUp(int keyCode, KeyEvent event) {
        // If we want to do transformations on text being entered with a hard
        // keyboard, we need to process the up events to update the meta key
        // state we are tracking.
        if (PROCESS_HARD_KEYS) {
            if (mPredictionOn) {
                mMetaState = MetaKeyKeyListener.handleKeyUp(mMetaState, keyCode, event);
            }
        }

        return super.onKeyUp(keyCode, event);
    }

    /**
     * Helper function to commit any text being composed in to the editor.
     */
    private void commitTyped(InputConnection inputConnection) {
        if (mComposing.length() > 0) {
            inputConnection.commitText(mComposing, mComposing.length());
            mComposing.setLength(0);
            updateCandidates();
        }
    }

    /**
     * Helper to update the shift state of our keyboard based on the initial
     * editor state.
     */
    private void updateShiftKeyState(EditorInfo attr) {
        if (attr != null && mInputView != null && mQwertyKeyboard == mInputView.getKeyboard()) {
            int caps = 0;
            EditorInfo ei = getCurrentInputEditorInfo();
            if (ei != null && ei.inputType != EditorInfo.TYPE_NULL) {
                caps = getCurrentInputConnection().getCursorCapsMode(attr.inputType);
            }
            mInputView.setShifted(mCapsLock || caps != 0);
        }
    }

    /**
     * Helper to determine if a given character code is alphabetic.
     */
    private boolean isAlphabet(int code) {
        if (Character.isLetter(code)) {
            return true;
        } else {
            return false;
        }
    }

    /**
     * Helper to send a key down / key up pair to the current editor.
     */
    private void keyDownUp(int keyEventCode) {
        getCurrentInputConnection().sendKeyEvent(new KeyEvent(KeyEvent.ACTION_DOWN, keyEventCode));
        getCurrentInputConnection().sendKeyEvent(new KeyEvent(KeyEvent.ACTION_UP, keyEventCode));
    }

    /**
     * Helper to send a character to the editor as raw key events.
     */
    private void sendKey(int keyCode) {
        switch (keyCode) {
            case '\n':
                keyDownUp(KeyEvent.KEYCODE_ENTER);
                break;
            default:
                if (keyCode >= '0' && keyCode <= '9') {
                    keyDownUp(keyCode - '0' + KeyEvent.KEYCODE_0);
                } else {
                    getCurrentInputConnection().commitText(String.valueOf((char) keyCode), 1);
                }
                break;
        }
    }

    // Implementation of KeyboardViewListener

    public void onKey(int primaryCode, int[] keyCodes) {
        if (isWordSeparator(primaryCode)) {
            // Handle separator
            if (mComposing.length() > 0) {
                commitTyped(getCurrentInputConnection());
            }
            sendKey(primaryCode);
            updateShiftKeyState(getCurrentInputEditorInfo());
        } else if (primaryCode == Keyboard.KEYCODE_DELETE) {
            handleBackspace();
        } else if (primaryCode == Keyboard.KEYCODE_SHIFT) {
            handleShift();
        } else if (primaryCode == Keyboard.KEYCODE_CANCEL) {
            handleClose();
            return;
        } else if (primaryCode == Keyboard.KEYCODE_MODE_CHANGE && mInputView != null) {
            Keyboard current = mInputView.getKeyboard();
            if (current == mSymbolsKeyboard || current == mSymbolsShiftedKeyboard) {
                current = mQwertyKeyboard;
            } else {
                current = mSymbolsKeyboard;
            }
            mInputView.setKeyboard(current);
            if (current == mSymbolsKeyboard) {
                current.setShifted(false);
            }
        } else {
            handleCharacter(primaryCode, keyCodes);
        }
    }

    public void onText(CharSequence text) {
        InputConnection ic = getCurrentInputConnection();
        if (ic == null)
            return;
        ic.beginBatchEdit();
        if (mComposing.length() > 0) {
            commitTyped(ic);
        }
        ic.commitText(text, 0);
        ic.endBatchEdit();
        updateShiftKeyState(getCurrentInputEditorInfo());
    }

    /**
     * Update the list of available candidates from the current composing text.
     * This will need to be filled in by however you are determining candidates.
     */
    private void updateCandidates() {
        if (!mCompletionOn) {
            if (mComposing.length() > 0) {
                ArrayList<String> list = new ArrayList<String>();
                list.add(mComposing.toString());
                setSuggestions(list, true, true);
            } else {
                setSuggestions(null, false, false);
            }
        }
    }

    public void setSuggestions(List<String> suggestions, boolean completions, boolean typedWordValid) {
        if (suggestions != null && suggestions.size() > 0) {
            setCandidatesViewShown(true);
        } else if (isExtractViewShown()) {
            setCandidatesViewShown(true);
        }
        if (mCandidateView != null) {
            mCandidateView.setSuggestions(suggestions, completions, typedWordValid);
        }
    }

    public void handleBackspace() {
        final int length = mComposing.length();
        if (length > 1) {
            mComposing.delete(length - 1, length);
            getCurrentInputConnection().setComposingText(mComposing, 1);
            updateCandidates();
        } else if (length > 0) {
            mComposing.setLength(0);
            getCurrentInputConnection().commitText("", 0);
            updateCandidates();
        } else {
            keyDownUp(KeyEvent.KEYCODE_DEL);
        }
        updateShiftKeyState(getCurrentInputEditorInfo());
    }

    private void handleShift() {
        if (mInputView == null) {
            return;
        }

        Keyboard currentKeyboard = mInputView.getKeyboard();
        if (mQwertyKeyboard == currentKeyboard) {
            // Alphabet keyboard
            checkToggleCapsLock();
            mInputView.setShifted(mCapsLock || !mInputView.isShifted());
        } else if (currentKeyboard == mSymbolsKeyboard) {
            mSymbolsKeyboard.setShifted(true);
            mInputView.setKeyboard(mSymbolsShiftedKeyboard);
            mSymbolsShiftedKeyboard.setShifted(true);
        } else if (currentKeyboard == mSymbolsShiftedKeyboard) {
            mSymbolsShiftedKeyboard.setShifted(false);
            mInputView.setKeyboard(mSymbolsKeyboard);
            mSymbolsKeyboard.setShifted(false);
        }
    }

    private void handleCharacter(int primaryCode, int[] keyCodes) {
        if (isInputViewShown()) {
            if (mInputView.isShifted()) {
                primaryCode = Character.toUpperCase(primaryCode);
            }
        }
        if (isAlphabet(primaryCode) && mPredictionOn) {
            mComposing.append((char) primaryCode);
            getCurrentInputConnection().setComposingText(mComposing, 1);
            updateShiftKeyState(getCurrentInputEditorInfo());
            updateCandidates();
        } else {
            getCurrentInputConnection().commitText(String.valueOf((char) primaryCode), 1);
        }
    }

    private void handleClose() {
        commitTyped(getCurrentInputConnection());
        requestHideSelf(0);
        mInputView.closing();
    }

    private void checkToggleCapsLock() {
        long now = System.currentTimeMillis();
        if (mLastShiftTime + 800 > now) {
            mCapsLock = !mCapsLock;
            mLastShiftTime = 0;
        } else {
            mLastShiftTime = now;
        }
    }

    private String getWordSeparators() {
        return mWordSeparators;
    }

    public boolean isWordSeparator(int code) {
        String separators = getWordSeparators();
        return separators.contains(String.valueOf((char) code));
    }

    public void pickDefaultCandidate() {
        pickSuggestionManually(0);
    }

    public void pickSuggestionManually(int index) {
        if (mCompletionOn && mCompletions != null && index >= 0 && index < mCompletions.length) {
            CompletionInfo ci = mCompletions[index];
            getCurrentInputConnection().commitCompletion(ci);
            if (mCandidateView != null) {
                mCandidateView.clear();
            }
            updateShiftKeyState(getCurrentInputEditorInfo());
        } else if (mComposing.length() > 0) {
            // If we were generating candidate suggestions for the current
            // text, we would commit one of them here. But for this sample,
            // we will just commit the current text.
            commitTyped(getCurrentInputConnection());
        }
    }

    public void swipeRight() {
        if (mCompletionOn) {
            pickDefaultCandidate();
        }
    }

    public void swipeLeft() {
        handleBackspace();
    }

    public void swipeDown() {
        handleClose();
    }

    public void swipeUp() {
    }

    public void onPress(int primaryCode) {
    }

    public void onRelease(int primaryCode) {
    }

    /*
    public void onComputeInsets(Insets outInsets) {
        View decor = getWindow().getWindow().getDecorView();
        outInsets.visibleTopInsets = decor.getHeight(); //0;
        outInsets.contentTopInsets = 0; //decor.getHeight();
        outInsets.touchableInsets = Insets.TOUCHABLE_INSETS_FRAME;
    }
    */
    

    public boolean isLandscape() {
        if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE){
            return true;
        }
        return false;
    }
    
    @Override
    public boolean onEvaluateFullscreenMode(){
        return true;
    }
    
    @Override
    public void  onUpdateExtractingVisibility  (EditorInfo ei){
        ei.imeOptions = EditorInfo.TYPE_NULL;
//        ei.imeOptions = EditorInfo.IME_FLAG_NO_EXTRACT_UI;
        setExtractViewShown(false);
    }
    
    @Override
    public void onUpdateExtractingViews(EditorInfo ei){
        ei.imeOptions = EditorInfo.TYPE_NULL;
        // EditorInfo.IME_FLAG_NO_EXTRACT_UI;
            setExtractViewShown(false);
    }
    
    @Override
    public View onCreateExtractTextView  (){
        return null;
        //View extractTextView = super.onCreateExtractTextView();
        //extractTextView.setVisibility(View.GONE);
        //return extractTextView;
    }
    
    @Override
    public void onWindowHidden(){
        this.stopSelf();
    }


}