/*
 * Copyright (C) 2016 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 android.widget;

import android.app.Activity;
import android.os.Bundle;
import android.perftests.utils.BenchmarkState;
import android.perftests.utils.PerfStatusReporter;
import android.perftests.utils.StubActivity;
import android.text.Selection;
import android.view.KeyEvent;
import android.view.View.MeasureSpec;
import android.view.ViewGroup;

import android.support.test.InstrumentationRegistry;
import android.support.test.filters.LargeTest;
import android.support.test.rule.ActivityTestRule;
import android.support.test.runner.AndroidJUnit4;

import java.util.Arrays;
import java.util.Collection;
import java.util.Locale;

import org.junit.Assert;
import org.junit.Rule;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized.Parameters;
import org.junit.runners.Parameterized;

@LargeTest
@RunWith(Parameterized.class)
public class EditTextCursorMovementPerfTest {

    private static final String BOY = "\uD83D\uDC66";  // U+1F466
    private static final String US_FLAG = "\uD83C\uDDFA\uD83C\uDDF8";  // U+1F1FA U+1F1F8
    private static final String FAMILY =
            // U+1F469 U+200D U+1F469 U+200D U+1F467 U+200D U+1F467
            "\uD83D\uDC69\u200D\uD83D\uDC69\u200D\uD83D\uDC67\u200D\uD83D\uDC67";

    @Parameters(name = "{0}")
    public static Collection cases() {
        return Arrays.asList(new Object[][] {
            { "Latin", "aaa", 1 },
            { "Emoji", BOY + BOY + BOY, 2 },
            { "Flags", US_FLAG + US_FLAG + US_FLAG, 4 },
            { "ZwjSequence", FAMILY + FAMILY + FAMILY, 11 },
        });
    }

    private final String mMetricKey;
    private final String mText;
    private final int mCursorPos;

    private static final KeyEvent LEFT_ARROW_KEY_EVENT =
            new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_DPAD_LEFT);
    private static final KeyEvent RIGHT_ARROW_KEY_EVENT =
            new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_DPAD_RIGHT);

    public EditTextCursorMovementPerfTest(String metricKey, String text, int cursorPos) {
        mMetricKey = metricKey;
        mText = text;
        mCursorPos = cursorPos;
    }

    @Rule
    public ActivityTestRule<StubActivity> mActivityRule = new ActivityTestRule(StubActivity.class);

    @Rule
    public PerfStatusReporter mPerfStatusReporter = new PerfStatusReporter();

    @Test
    public void testCursorMovement() {
        InstrumentationRegistry.getInstrumentation().runOnMainSync(new Runnable() {
            @Override
            public void run() {
                EditText editText = new EditText(mActivityRule.getActivity());

                editText.setText(mText, TextView.BufferType.EDITABLE);
                Selection.setSelection(editText.getText(), 0, 0);

                // Layout it here since the cursor movement requires layout information but it
                // happens asynchronously even if the view is attached to an Activity.
                editText.setLayoutParams(new ViewGroup.LayoutParams(
                        ViewGroup.LayoutParams.WRAP_CONTENT,
                        ViewGroup.LayoutParams.WRAP_CONTENT));
                editText.invalidate();
                editText.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED),
                                 MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
                editText.layout(0, 0, 1024, 768);

                // mText contains three grapheme clusters. Move the cursor to the 2nd grapheme
                // cluster by forwarding right arrow key event.
                editText.onKeyDown(RIGHT_ARROW_KEY_EVENT.getKeyCode(), RIGHT_ARROW_KEY_EVENT);
                Assert.assertEquals(mCursorPos, Selection.getSelectionStart(editText.getText()));

                BenchmarkState state = mPerfStatusReporter.getBenchmarkState();
                while (state.keepRunning()) {
                    editText.onKeyDown(RIGHT_ARROW_KEY_EVENT.getKeyCode(), RIGHT_ARROW_KEY_EVENT);
                    editText.onKeyDown(LEFT_ARROW_KEY_EVENT.getKeyCode(), LEFT_ARROW_KEY_EVENT);
                }
            }
        });
    }
}