/*
 * Copyright (C) 2012 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.inputmethod.latin;

import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Looper;
import android.os.MessageQueue;
import android.preference.PreferenceManager;
import android.test.ServiceTestCase;
import android.text.InputType;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.ViewGroup;
import android.view.View;
import android.view.inputmethod.BaseInputConnection;
import android.view.inputmethod.EditorInfo;
import android.view.inputmethod.InputConnection;
import android.widget.FrameLayout;
import android.widget.TextView;

import com.android.inputmethod.keyboard.Keyboard;
import com.android.inputmethod.keyboard.KeyboardActionListener;
import com.android.inputmethod.latin.spellcheck.AndroidSpellCheckerService; // for proximity info
import com.android.inputmethod.latin.spellcheck.SpellCheckerProximityInfo;

import java.util.Arrays;
import java.util.HashMap;

public class InputLogicTests extends ServiceTestCase<LatinIME> {

    private static final String PREF_DEBUG_MODE = "debug_mode";

    private LatinIME mLatinIME;
    private TextView mTextView;
    private InputConnection mInputConnection;
    private HashMap<Integer, int[]> mProximity;

    public InputLogicTests() {
        super(LatinIME.class);
        mProximity = createProximity();
    }

    private static HashMap<Integer, int[]> createProximity() {
        final HashMap<Integer, int[]> proximity = new HashMap<Integer, int[]>();
        final int[] testProximity = SpellCheckerProximityInfo.getProximityForScript(
                AndroidSpellCheckerService.SCRIPT_LATIN);
        final int ROW_SIZE = SpellCheckerProximityInfo.ROW_SIZE;
        final int NUL = SpellCheckerProximityInfo.NUL;
        for (int row = 0; row * ROW_SIZE < testProximity.length; ++row) {
            final int rowBase = row * ROW_SIZE;
            int column;
            for (column = 1; NUL != testProximity[rowBase + column]; ++column) {
                // Do nothing, just search for a NUL element
            }
            proximity.put(testProximity[row * ROW_SIZE],
                    Arrays.copyOfRange(testProximity, rowBase, rowBase + column));
        }
        return proximity;
    }

    // returns the previous setting value
    private boolean setDebugMode(final boolean mode) {
        final SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(mLatinIME);
        final boolean previousDebugSetting = prefs.getBoolean(PREF_DEBUG_MODE, false);
        final SharedPreferences.Editor editor = prefs.edit();
        editor.putBoolean(PREF_DEBUG_MODE, true);
        editor.commit();
        return previousDebugSetting;
    }

    @Override
    protected void setUp() {
        try {
            super.setUp();
        } catch (Exception e) {
            e.printStackTrace();
        }
        mTextView = new TextView(getContext());
        mTextView.setInputType(InputType.TYPE_CLASS_TEXT);
        mTextView.setEnabled(true);
        setupService();
        mLatinIME = getService();
        final boolean previousDebugSetting = setDebugMode(true);
        mLatinIME.onCreate();
        setDebugMode(previousDebugSetting);
        final EditorInfo ei = new EditorInfo();
        ei.inputType = InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_FLAG_AUTO_CORRECT;
        final InputConnection ic = mTextView.onCreateInputConnection(ei);
        ei.inputType = InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_FLAG_AUTO_CORRECT;
        final LayoutInflater inflater =
                (LayoutInflater)getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        final ViewGroup vg = new FrameLayout(getContext());
        final View inputView = inflater.inflate(R.layout.input_view, vg);
        mLatinIME.setInputView(inputView);
        mLatinIME.onBindInput();
        mLatinIME.onCreateInputView();
        mLatinIME.onStartInputView(ei, false);
        mLatinIME.onCreateInputMethodInterface().startInput(ic, ei);
        mInputConnection = ic;
        // Wait for the main dictionary to be loaded (we need it for auto-correction tests)
        int remainingAttempts = 10;
        while (remainingAttempts > 0 && !mLatinIME.mSuggest.hasMainDictionary()) {
            try {
                Thread.sleep(100);
            } catch (InterruptedException e) {
                // Don't do much
            } finally {
                --remainingAttempts;
            }
        }
        if (!mLatinIME.mSuggest.hasMainDictionary()) {
            throw new RuntimeException("Can't initialize the main dictionary");
        }
    }

    // We need to run the messages added to the handler from LatinIME. The only way to do
    // that is to call Looper#loop() on the right looper, so we're going to get the looper
    // object and call #loop() here. The messages in the handler actually run on the UI
    // thread of the keyboard by design of the handler, so we want to call it synchronously
    // on the same thread that the tests are running on to mimic the actual environment as
    // closely as possible.
    // Now, Looper#loop() never exits in normal operation unless the Looper#quit() method
    // is called, so we need to do that at the right time so that #loop() returns at some
    // point and we don't end up in an infinite loop.
    // After we quit, the looper is still technically ready to process more messages but
    // the handler will refuse to enqueue any because #quit() has been called and it
    // explicitly tests for it on message enqueuing, so we'll have to reset it so that
    // it lets us continue normal operation.
    private void runMessages() {
        // Here begins deep magic.
        final Looper looper = mLatinIME.mHandler.getLooper();
        mLatinIME.mHandler.post(new Runnable() {
                @Override
                public void run() {
                    looper.quit();
                }
            });
        // The only way to get out of Looper#loop() is to call #quit() on it (or on its queue).
        // Once #quit() is called remaining messages are not processed, which is why we post
        // a message that calls it instead of calling it directly.
        looper.loop();

        // Once #quit() has been called, the message queue has an "mQuiting" field that prevents
        // any subsequent post in this queue. However the queue itself is still fully functional!
        // If we have a way of resetting "queue.mQuiting" then we can continue using it as normal,
        // coming back to this method to run the messages.
        MessageQueue queue = looper.getQueue();
        try {
            // However there is no way of doing it externally, and mQuiting is private.
            // So... get out the big guns.
            java.lang.reflect.Field f = MessageQueue.class.getDeclaredField("mQuiting");
            f.setAccessible(true); // What do you mean "private"?
            f.setBoolean(queue, false);
        } catch (NoSuchFieldException e) {
            throw new RuntimeException(e);
        } catch (IllegalAccessException e) {
            throw new RuntimeException(e);
        }
    }

    // type(int) and type(String): helper methods to send a code point resp. a string to LatinIME.
    private void type(final int codePoint) {
        // onPressKey and onReleaseKey are explicitly deactivated here, but they do happen in the
        // code (although multitouch/slide input and other factors make the sequencing complicated).
        // They are supposed to be entirely deconnected from the input logic from LatinIME point of
        // view and only delegates to the parts of the code that care. So we don't include them here
        // to keep these tests as pinpoint as possible and avoid bringing it too many dependencies,
        // but keep them in mind if something breaks. Commenting them out as is should work.
        //mLatinIME.onPressKey(codePoint);
        int[] proximityKeys = mProximity.get(codePoint);
        if (null == proximityKeys) {
            proximityKeys = new int[] { codePoint };
        }
        mLatinIME.onCodeInput(codePoint, proximityKeys,
                KeyboardActionListener.NOT_A_TOUCH_COORDINATE,
                KeyboardActionListener.NOT_A_TOUCH_COORDINATE);
        //mLatinIME.onReleaseKey(codePoint, false);
    }

    private void type(final String stringToType) {
        for (int i = 0; i < stringToType.length(); i = stringToType.offsetByCodePoints(i, 1)) {
            type(stringToType.codePointAt(i));
        }
    }

    public void testTypeWord() {
        final String WORD_TO_TYPE = "abcd";
        type(WORD_TO_TYPE);
        assertEquals("type word", WORD_TO_TYPE, mTextView.getText().toString());
    }

    public void testPickSuggestionThenBackspace() {
        final String WORD_TO_TYPE = "this";
        final String EXPECTED_RESULT = "this";
        type(WORD_TO_TYPE);
        mLatinIME.pickSuggestionManually(0, WORD_TO_TYPE);
        mLatinIME.onUpdateSelection(0, 0, WORD_TO_TYPE.length(), WORD_TO_TYPE.length(), -1, -1);
        type(Keyboard.CODE_DELETE);
        assertEquals("press suggestion then backspace", EXPECTED_RESULT,
                mTextView.getText().toString());
    }

    public void testPickAutoCorrectionThenBackspace() {
        final String WORD_TO_TYPE = "tgis";
        final String WORD_TO_PICK = "this";
        final String EXPECTED_RESULT = "tgis";
        type(WORD_TO_TYPE);
        // Choose the auto-correction, which is always in position 0. For "tgis", the
        // auto-correction should be "this".
        mLatinIME.pickSuggestionManually(0, WORD_TO_PICK);
        mLatinIME.onUpdateSelection(0, 0, WORD_TO_TYPE.length(), WORD_TO_TYPE.length(), -1, -1);
        assertEquals("pick typed word over auto-correction then backspace", WORD_TO_PICK,
                mTextView.getText().toString());
        type(Keyboard.CODE_DELETE);
        assertEquals("pick typed word over auto-correction then backspace", EXPECTED_RESULT,
                mTextView.getText().toString());
    }

    public void testPickTypedWordOverAutoCorrectionThenBackspace() {
        final String WORD_TO_TYPE = "tgis";
        final String EXPECTED_RESULT = "tgis";
        type(WORD_TO_TYPE);
        // Choose the typed word, which should be in position 1 (because position 0 should
        // be occupied by the "this" auto-correction, as checked by testAutoCorrect())
        mLatinIME.pickSuggestionManually(1, WORD_TO_TYPE);
        mLatinIME.onUpdateSelection(0, 0, WORD_TO_TYPE.length(), WORD_TO_TYPE.length(), -1, -1);
        assertEquals("pick typed word over auto-correction then backspace", WORD_TO_TYPE,
                mTextView.getText().toString());
        type(Keyboard.CODE_DELETE);
        assertEquals("pick typed word over auto-correction then backspace", EXPECTED_RESULT,
                mTextView.getText().toString());
    }

    public void testPickDifferentSuggestionThenBackspace() {
        final String WORD_TO_TYPE = "tgis";
        final String WORD_TO_PICK = "thus";
        final String EXPECTED_RESULT = "tgis";
        type(WORD_TO_TYPE);
        // Choose the second suggestion, which should be in position 2 and should be "thus"
        // when "tgis is typed.
        mLatinIME.pickSuggestionManually(2, WORD_TO_PICK);
        mLatinIME.onUpdateSelection(0, 0, WORD_TO_TYPE.length(), WORD_TO_TYPE.length(), -1, -1);
        assertEquals("pick different suggestion then backspace", WORD_TO_PICK,
                mTextView.getText().toString());
        type(Keyboard.CODE_DELETE);
        assertEquals("pick different suggestion then backspace", EXPECTED_RESULT,
                mTextView.getText().toString());
    }

    public void testDeleteSelection() {
        final String STRING_TO_TYPE = "some text delete me some text";
        final int SELECTION_START = 10;
        final int SELECTION_END = 19;
        final String EXPECTED_RESULT = "some text  some text";
        type(STRING_TO_TYPE);
        // There is no IMF to call onUpdateSelection for us so we must do it by hand.
        // Send once to simulate the cursor actually responding to the move caused by typing.
        // This is necessary because LatinIME is bookkeeping to avoid confusing a real cursor
        // move with a move triggered by LatinIME inputting stuff.
        mLatinIME.onUpdateSelection(0, 0, STRING_TO_TYPE.length(), STRING_TO_TYPE.length(), -1, -1);
        mInputConnection.setSelection(SELECTION_START, SELECTION_END);
        // And now we simulate the user actually selecting some text.
        mLatinIME.onUpdateSelection(0, 0, SELECTION_START, SELECTION_END, -1, -1);
        type(Keyboard.CODE_DELETE);
        assertEquals("delete selection", EXPECTED_RESULT, mTextView.getText().toString());
    }

    public void testAutoCorrect() {
        final String STRING_TO_TYPE = "tgis ";
        final String EXPECTED_RESULT = "this ";
        type(STRING_TO_TYPE);
        assertEquals("simple auto-correct", EXPECTED_RESULT, mTextView.getText().toString());
    }

    public void testAutoCorrectWithPeriod() {
        final String STRING_TO_TYPE = "tgis.";
        final String EXPECTED_RESULT = "this.";
        type(STRING_TO_TYPE);
        assertEquals("auto-correct with period", EXPECTED_RESULT, mTextView.getText().toString());
    }

    public void testAutoCorrectWithPeriodThenRevert() {
        final String STRING_TO_TYPE = "tgis.";
        final String EXPECTED_RESULT = "tgis.";
        type(STRING_TO_TYPE);
        mLatinIME.onUpdateSelection(0, 0, STRING_TO_TYPE.length(), STRING_TO_TYPE.length(), -1, -1);
        type(Keyboard.CODE_DELETE);
        assertEquals("auto-correct with period then revert", EXPECTED_RESULT,
                mTextView.getText().toString());
    }

    public void testDoubleSpace() {
        final String STRING_TO_TYPE = "this  ";
        final String EXPECTED_RESULT = "this. ";
        type(STRING_TO_TYPE);
        assertEquals("double space make a period", EXPECTED_RESULT, mTextView.getText().toString());
    }

    public void testCancelDoubleSpace() {
        final String STRING_TO_TYPE = "this  ";
        final String EXPECTED_RESULT = "this  ";
        type(STRING_TO_TYPE);
        type(Keyboard.CODE_DELETE);
        assertEquals("double space make a period", EXPECTED_RESULT, mTextView.getText().toString());
    }

    public void testBackspaceAtStartAfterAutocorrect() {
        final String STRING_TO_TYPE = "tgis ";
        final String EXPECTED_RESULT = "this ";
        final int NEW_CURSOR_POSITION = 0;
        type(STRING_TO_TYPE);
        mLatinIME.onUpdateSelection(0, 0, STRING_TO_TYPE.length(), STRING_TO_TYPE.length(), -1, -1);
        mInputConnection.setSelection(NEW_CURSOR_POSITION, NEW_CURSOR_POSITION);
        mLatinIME.onUpdateSelection(0, 0, NEW_CURSOR_POSITION, NEW_CURSOR_POSITION, -1, -1);
        type(Keyboard.CODE_DELETE);
        assertEquals("auto correct then move cursor to start of line then backspace",
                EXPECTED_RESULT, mTextView.getText().toString());
    }

    public void testAutoCorrectThenMoveCursorThenBackspace() {
        final String STRING_TO_TYPE = "and tgis ";
        final String EXPECTED_RESULT = "andthis ";
        final int NEW_CURSOR_POSITION = STRING_TO_TYPE.indexOf('t');
        type(STRING_TO_TYPE);
        mLatinIME.onUpdateSelection(0, 0, STRING_TO_TYPE.length(), STRING_TO_TYPE.length(), -1, -1);
        mInputConnection.setSelection(NEW_CURSOR_POSITION, NEW_CURSOR_POSITION);
        mLatinIME.onUpdateSelection(0, 0, NEW_CURSOR_POSITION, NEW_CURSOR_POSITION, -1, -1);
        type(Keyboard.CODE_DELETE);
        assertEquals("auto correct then move cursor then backspace",
                EXPECTED_RESULT, mTextView.getText().toString());
    }

    public void testNoSpaceAfterManualPick() {
        final String WORD_TO_TYPE = "this";
        final String EXPECTED_RESULT = WORD_TO_TYPE;
        type(WORD_TO_TYPE);
        mLatinIME.pickSuggestionManually(0, WORD_TO_TYPE);
        assertEquals("no space after manual pick", EXPECTED_RESULT,
                mTextView.getText().toString());
    }

    public void testManualPickThenType() {
        final String WORD1_TO_TYPE = "this";
        final String WORD2_TO_TYPE = "is";
        final String EXPECTED_RESULT = "this is";
        type(WORD1_TO_TYPE);
        mLatinIME.pickSuggestionManually(0, WORD1_TO_TYPE);
        type(WORD2_TO_TYPE);
        assertEquals("manual pick then type", EXPECTED_RESULT, mTextView.getText().toString());
    }

    public void testManualPickThenSeparator() {
        final String WORD1_TO_TYPE = "this";
        final String WORD2_TO_TYPE = "!";
        final String EXPECTED_RESULT = "this!";
        type(WORD1_TO_TYPE);
        mLatinIME.pickSuggestionManually(0, WORD1_TO_TYPE);
        type(WORD2_TO_TYPE);
        assertEquals("manual pick then separator", EXPECTED_RESULT, mTextView.getText().toString());
    }

    public void testWordThenSpaceThenPunctuationFromStripTwice() {
        final String WORD_TO_TYPE = "this ";
        final String PUNCTUATION_FROM_STRIP = "!";
        final String EXPECTED_RESULT = "this!! ";
        type(WORD_TO_TYPE);
        mLatinIME.pickSuggestionManually(0, PUNCTUATION_FROM_STRIP);
        mLatinIME.pickSuggestionManually(0, PUNCTUATION_FROM_STRIP);
        assertEquals("type word then type space then punctuation from strip twice", EXPECTED_RESULT,
                mTextView.getText().toString());
    }

    public void testWordThenSpaceThenPunctuationFromKeyboardTwice() {
        final String WORD_TO_TYPE = "this !!";
        final String EXPECTED_RESULT = "this !!";
        type(WORD_TO_TYPE);
        assertEquals("manual pick then space then punctuation from keyboard twice", EXPECTED_RESULT,
                mTextView.getText().toString());
    }

    public void testManualPickThenPunctuationFromStripTwiceThenType() {
        final String WORD1_TO_TYPE = "this";
        final String WORD2_TO_TYPE = "is";
        final String PUNCTUATION_FROM_STRIP = "!";
        final String EXPECTED_RESULT = "this!! is";
        type(WORD1_TO_TYPE);
        mLatinIME.pickSuggestionManually(0, WORD1_TO_TYPE);
        mLatinIME.pickSuggestionManually(0, PUNCTUATION_FROM_STRIP);
        mLatinIME.pickSuggestionManually(0, PUNCTUATION_FROM_STRIP);
        type(WORD2_TO_TYPE);
        assertEquals("pick word then pick punctuation twice then type", EXPECTED_RESULT,
                mTextView.getText().toString());
    }

    public void testManualPickThenSpaceThenType() {
        final String WORD1_TO_TYPE = "this";
        final String WORD2_TO_TYPE = " is";
        final String EXPECTED_RESULT = "this is";
        type(WORD1_TO_TYPE);
        mLatinIME.pickSuggestionManually(0, WORD1_TO_TYPE);
        type(WORD2_TO_TYPE);
        assertEquals("manual pick then space then type", WORD1_TO_TYPE + WORD2_TO_TYPE,
                mTextView.getText().toString());
    }

    public void testDeleteWholeComposingWord() {
        final String WORD_TO_TYPE = "this";
        type(WORD_TO_TYPE);
        for (int i = 0; i < WORD_TO_TYPE.length(); ++i) {
            type(Keyboard.CODE_DELETE);
        }
        assertEquals("delete whole composing word", "", mTextView.getText().toString());
    }

    public void testManuallyPickedWordThenColon() {
        final String WORD_TO_TYPE = "this";
        final String PUNCTUATION = ":";
        final String EXPECTED_RESULT = "this:";
        type(WORD_TO_TYPE);
        mLatinIME.pickSuggestionManually(0, WORD_TO_TYPE);
        type(PUNCTUATION);
        assertEquals("manually pick word then colon",
                EXPECTED_RESULT, mTextView.getText().toString());
    }

    public void testManuallyPickedWordThenOpenParen() {
        final String WORD_TO_TYPE = "this";
        final String PUNCTUATION = "(";
        final String EXPECTED_RESULT = "this (";
        type(WORD_TO_TYPE);
        mLatinIME.pickSuggestionManually(0, WORD_TO_TYPE);
        type(PUNCTUATION);
        assertEquals("manually pick word then open paren",
                EXPECTED_RESULT, mTextView.getText().toString());
    }

    public void testManuallyPickedWordThenCloseParen() {
        final String WORD_TO_TYPE = "this";
        final String PUNCTUATION = ")";
        final String EXPECTED_RESULT = "this)";
        type(WORD_TO_TYPE);
        mLatinIME.pickSuggestionManually(0, WORD_TO_TYPE);
        type(PUNCTUATION);
        assertEquals("manually pick word then close paren",
                EXPECTED_RESULT, mTextView.getText().toString());
    }

    public void testManuallyPickedWordThenSmiley() {
        final String WORD_TO_TYPE = "this";
        final String SPECIAL_KEY = ":-)";
        final String EXPECTED_RESULT = "this :-)";
        type(WORD_TO_TYPE);
        mLatinIME.pickSuggestionManually(0, WORD_TO_TYPE);
        mLatinIME.onTextInput(SPECIAL_KEY);
        assertEquals("manually pick word then press the smiley key",
                EXPECTED_RESULT, mTextView.getText().toString());
    }

    public void testManuallyPickedWordThenDotCom() {
        final String WORD_TO_TYPE = "this";
        final String SPECIAL_KEY = ".com";
        final String EXPECTED_RESULT = "this.com";
        type(WORD_TO_TYPE);
        mLatinIME.pickSuggestionManually(0, WORD_TO_TYPE);
        mLatinIME.onTextInput(SPECIAL_KEY);
        assertEquals("manually pick word then press the .com key",
                EXPECTED_RESULT, mTextView.getText().toString());
    }

    public void testTypeWordTypeDotThenPressDotCom() {
        final String WORD_TO_TYPE = "this.";
        final String SPECIAL_KEY = ".com";
        final String EXPECTED_RESULT = "this.com";
        type(WORD_TO_TYPE);
        mLatinIME.onTextInput(SPECIAL_KEY);
        assertEquals("type word type dot then press the .com key",
                EXPECTED_RESULT, mTextView.getText().toString());
    }

    // TODO: Add some tests for non-BMP characters
}