/*
 * Copyright (C) 2017 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.launcher3.ui;

import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.fail;

import static androidx.test.InstrumentationRegistry.getInstrumentation;

import android.app.Instrumentation;
import android.content.BroadcastReceiver;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.pm.LauncherActivityInfo;
import android.graphics.Point;
import android.os.Process;
import android.os.RemoteException;
import android.os.SystemClock;
import android.util.Log;
import android.view.MotionEvent;
import android.view.Surface;

import androidx.test.InstrumentationRegistry;
import androidx.test.uiautomator.By;
import androidx.test.uiautomator.BySelector;
import androidx.test.uiautomator.Direction;
import androidx.test.uiautomator.UiDevice;
import androidx.test.uiautomator.UiObject2;
import androidx.test.uiautomator.Until;

import com.android.launcher3.Launcher;
import com.android.launcher3.LauncherAppState;
import com.android.launcher3.LauncherAppWidgetProviderInfo;
import com.android.launcher3.LauncherSettings;
import com.android.launcher3.LauncherState;
import com.android.launcher3.MainThreadExecutor;
import com.android.launcher3.R;
import com.android.launcher3.Utilities;
import com.android.launcher3.compat.AppWidgetManagerCompat;
import com.android.launcher3.compat.LauncherAppsCompat;
import com.android.launcher3.tapl.LauncherInstrumentation;
import com.android.launcher3.tapl.TestHelpers;
import com.android.launcher3.testcomponent.AppWidgetNoConfig;
import com.android.launcher3.testcomponent.AppWidgetWithConfig;
import com.android.launcher3.util.Wait;
import com.android.launcher3.util.rule.LauncherActivityRule;
import com.android.launcher3.util.rule.ShellCommandRule;

import org.junit.After;
import org.junit.Before;
import org.junit.Rule;
import org.junit.rules.TestRule;
import org.junit.runners.model.Statement;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.util.concurrent.Callable;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import java.util.function.Consumer;
import java.util.function.Function;

/**
 * Base class for all instrumentation tests providing various utility methods.
 */
public abstract class AbstractLauncherUiTest {

    public static final long DEFAULT_ACTIVITY_TIMEOUT = TimeUnit.SECONDS.toMillis(10);
    public static final long DEFAULT_BROADCAST_TIMEOUT_SECS = 5;

    public static final long SHORT_UI_TIMEOUT= 300;
    public static final long DEFAULT_UI_TIMEOUT = 10000;
    public static final long DEFAULT_WORKER_TIMEOUT_SECS = 5;

    protected MainThreadExecutor mMainThreadExecutor = new MainThreadExecutor();
    protected final UiDevice mDevice;
    protected final LauncherInstrumentation mLauncher;
    protected Context mTargetContext;
    protected String mTargetPackage;

    private static final String TAG = "AbstractLauncherUiTest";

    protected AbstractLauncherUiTest() {
        final Instrumentation instrumentation = getInstrumentation();
        mDevice = UiDevice.getInstance(instrumentation);
        try {
            mDevice.setOrientationNatural();
        } catch (RemoteException e) {
            throw new RuntimeException(e);
        }
        if (TestHelpers.isInLauncherProcess()) Utilities.enableRunningInTestHarnessForTests();
        mLauncher = new LauncherInstrumentation(instrumentation);
    }

    @Rule
    public LauncherActivityRule mActivityMonitor = new LauncherActivityRule();

    @Rule public ShellCommandRule mDefaultLauncherRule = ShellCommandRule.setDefaultLauncher();

    @Rule public ShellCommandRule mDisableHeadsUpNotification =
            ShellCommandRule.disableHeadsUpNotification();

    // Annotation for tests that need to be run in portrait and landscape modes.
    @Retention(RetentionPolicy.RUNTIME)
    @Target(ElementType.METHOD)
    protected @interface PortraitLandscape {
    }

    @Rule
    public TestRule mPortraitLandscapeExecutor =
            (base, description) -> false && description.getAnnotation(PortraitLandscape.class)
                    != null ? new Statement() {
                @Override
                public void evaluate() throws Throwable {
                    try {
                        // Create launcher activity if necessary and bring it to the front.
                        mDevice.pressHome();
                        waitForLauncherCondition(launcher -> launcher != null);

                        executeOnLauncher(launcher ->
                                launcher.getRotationHelper().forceAllowRotationForTesting(true));

                        evaluateInPortrait();
                        evaluateInLandscape();
                    } finally {
                        mDevice.setOrientationNatural();
                        executeOnLauncher(launcher ->
                                launcher.getRotationHelper().forceAllowRotationForTesting(false));
                        mLauncher.setExpectedRotation(Surface.ROTATION_0);
                    }
                }

                private void evaluateInPortrait() throws Throwable {
                    mDevice.setOrientationNatural();
                    mLauncher.setExpectedRotation(Surface.ROTATION_0);
                    base.evaluate();
                }

                private void evaluateInLandscape() throws Throwable {
                    mDevice.setOrientationLeft();
                    mLauncher.setExpectedRotation(Surface.ROTATION_90);
                    base.evaluate();
                }
            } : base;

    @Before
    public void setUp() throws Exception {
        mTargetContext = InstrumentationRegistry.getTargetContext();
        mTargetPackage = mTargetContext.getPackageName();
    }

    @After
    public void tearDown() throws Exception {
        // Limits UI tests affecting tests running after them.
        resetLoaderState();
    }

    protected void lockRotation(boolean naturalOrientation) throws RemoteException {
        if (naturalOrientation) {
            mDevice.setOrientationNatural();
        } else {
            mDevice.setOrientationRight();
        }
    }

    /**
     * Opens all apps and returns the recycler view
     */
    protected UiObject2 openAllApps() {
        mDevice.waitForIdle();
        UiObject2 hotseat = mDevice.wait(
                Until.findObject(getSelectorForId(R.id.hotseat)), 2500);
        Point start = hotseat.getVisibleCenter();
        int endY = (int) (mDevice.getDisplayHeight() * 0.1f);
        // 100 px/step
        mDevice.swipe(start.x, start.y, start.x, endY, (start.y - endY) / 100);
        return findViewById(R.id.apps_list_view);
    }

    /**
     * Opens widget tray and returns the recycler view.
     */
    protected UiObject2 openWidgetsTray() {
        mDevice.pressMenu(); // Enter overview mode.
        mDevice.wait(Until.findObject(
                By.text(mTargetContext.getString(R.string.widget_button_text))), DEFAULT_UI_TIMEOUT).click();
        return findViewById(R.id.widgets_list_view);
    }

    /**
     * Scrolls the {@param container} until it finds an object matching {@param condition}.
     * @return the matching object.
     */
    protected UiObject2 scrollAndFind(UiObject2 container, BySelector condition) {
        container.setGestureMargins(0, 0, 0, 200);

        int i = 0;
        for (; ; ) {
            // findObject can only execute after spring settles.
            mDevice.wait(Until.findObject(condition), SHORT_UI_TIMEOUT);
            UiObject2 widget = container.findObject(condition);
            if (widget != null && widget.getVisibleBounds().intersects(
                    0, 0, mDevice.getDisplayWidth(), mDevice.getDisplayHeight() - 200)) {
                return widget;
            }
            if (++i > 40) fail("Too many attempts");
            container.scroll(Direction.DOWN, 1f);
        }
    }

    /**
     * Drags an icon to the center of homescreen.
     * @param icon  object that is either app icon or shortcut icon
     */
    protected void dragToWorkspace(UiObject2 icon, boolean expectedToShowShortcuts) {
        Point center = icon.getVisibleCenter();

        // Action Down
        sendPointer(MotionEvent.ACTION_DOWN, center);

        UiObject2 dragLayer = findViewById(R.id.drag_layer);

        if (expectedToShowShortcuts) {
            // Make sure shortcuts show up, and then move a bit to hide them.
            assertNotNull(findViewById(R.id.deep_shortcuts_container));

            Point moveLocation = new Point(center);
            int distanceToMove = mTargetContext.getResources().getDimensionPixelSize(
                    R.dimen.deep_shortcuts_start_drag_threshold) + 50;
            if (moveLocation.y - distanceToMove >= dragLayer.getVisibleBounds().top) {
                moveLocation.y -= distanceToMove;
            } else {
                moveLocation.y += distanceToMove;
            }
            movePointer(center, moveLocation);

            assertNull(findViewById(R.id.deep_shortcuts_container));
        }

        // Wait until Remove/Delete target is visible
        assertNotNull(findViewById(R.id.delete_target_text));

        Point moveLocation = dragLayer.getVisibleCenter();

        // Move to center
        movePointer(center, moveLocation);
        sendPointer(MotionEvent.ACTION_UP, center);

        // Wait until remove target is gone.
        mDevice.wait(Until.gone(getSelectorForId(R.id.delete_target_text)), DEFAULT_UI_TIMEOUT);
    }

    private void movePointer(Point from, Point to) {
        while(!from.equals(to)) {
            from.x = getNextMoveValue(to.x, from.x);
            from.y = getNextMoveValue(to.y, from.y);
            sendPointer(MotionEvent.ACTION_MOVE, from);
        }
    }

    private int getNextMoveValue(int targetValue, int oldValue) {
        if (targetValue - oldValue > 10) {
            return oldValue + 10;
        } else if (targetValue - oldValue < -10) {
            return oldValue - 10;
        } else {
            return targetValue;
        }
    }

    protected void sendPointer(int action, Point point) {
        MotionEvent event = MotionEvent.obtain(SystemClock.uptimeMillis(),
                SystemClock.uptimeMillis(), action, point.x, point.y, 0);
        getInstrumentation().sendPointerSync(event);
        event.recycle();
    }

    /**
     * Removes all icons from homescreen and hotseat.
     */
    public void clearHomescreen() throws Throwable {
        LauncherSettings.Settings.call(mTargetContext.getContentResolver(),
                LauncherSettings.Settings.METHOD_CREATE_EMPTY_DB);
        LauncherSettings.Settings.call(mTargetContext.getContentResolver(),
                LauncherSettings.Settings.METHOD_CLEAR_EMPTY_DB_FLAG);
        resetLoaderState();
    }

    protected void resetLoaderState() {
        if (com.android.launcher3.Utilities.IS_RUNNING_IN_TEST_HARNESS
                && com.android.launcher3.Utilities.IS_DEBUG_DEVICE) {
            android.util.Log.d("b/117332845",
                    "START " + android.util.Log.getStackTraceString(new Throwable()));
        }
        try {
            mMainThreadExecutor.execute(new Runnable() {
                @Override
                public void run() {
                    LauncherAppState.getInstance(mTargetContext).getModel().forceReload();
                }
            });
        } catch (Throwable t) {
            throw new IllegalArgumentException(t);
        }
        waitForLauncherCondition(launcher ->
                LauncherAppState.getInstance(mTargetContext).getModel().isModelLoaded());
        if (com.android.launcher3.Utilities.IS_RUNNING_IN_TEST_HARNESS
                && com.android.launcher3.Utilities.IS_DEBUG_DEVICE) {
            android.util.Log.d("b/117332845",
                    "FINISH " + android.util.Log.getStackTraceString(new Throwable()));
        }
    }

    /**
     * Runs the callback on the UI thread and returns the result.
     */
    protected <T> T getOnUiThread(final Callable<T> callback) {
        try {
            return mMainThreadExecutor.submit(callback).get();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    protected <T> T getFromLauncher(Function<Launcher, T> f) {
        if (!TestHelpers.isInLauncherProcess()) return null;
        return getOnUiThread(() -> f.apply(mActivityMonitor.getActivity()));
    }

    protected void executeOnLauncher(Consumer<Launcher> f) {
        getFromLauncher(launcher -> {
            f.accept(launcher);
            return null;
        });
    }

    // Cannot be used in TaplTests between a Tapl call injecting a gesture and a tapl call expecting
    // the results of that gesture because the wait can hide flakeness.
    protected boolean waitForState(LauncherState state) {
        return waitForLauncherCondition(launcher -> launcher.getStateManager().getState() == state);
    }

    // Cannot be used in TaplTests after injecting any gesture using Tapl because this can hide
    // flakiness.
    protected boolean waitForLauncherCondition(Function<Launcher, Boolean> condition) {
        return waitForLauncherCondition(condition, DEFAULT_ACTIVITY_TIMEOUT);
    }

    // Cannot be used in TaplTests after injecting any gesture using Tapl because this can hide
    // flakiness.
    protected boolean waitForLauncherCondition(
            Function<Launcher, Boolean> condition, long timeout) {
        if (!TestHelpers.isInLauncherProcess()) return true;
        return Wait.atMost(() -> getFromLauncher(condition), timeout);
    }

    /**
     * Finds a widget provider which can fit on the home screen.
     * @param hasConfigureScreen if true, a provider with a config screen is returned.
     */
    protected LauncherAppWidgetProviderInfo findWidgetProvider(final boolean hasConfigureScreen) {
        LauncherAppWidgetProviderInfo info =
                getOnUiThread(new Callable<LauncherAppWidgetProviderInfo>() {
            @Override
            public LauncherAppWidgetProviderInfo call() throws Exception {
                ComponentName cn = new ComponentName(getInstrumentation().getContext(),
                        hasConfigureScreen ? AppWidgetWithConfig.class : AppWidgetNoConfig.class);
                Log.d(TAG, "findWidgetProvider componentName=" + cn.flattenToString());
                return AppWidgetManagerCompat.getInstance(mTargetContext)
                        .findProvider(cn, Process.myUserHandle());
            }
        });
        if (info == null) {
            throw new IllegalArgumentException("No valid widget provider");
        }
        return info;
    }

    protected UiObject2 findViewById(int id) {
        return mDevice.wait(Until.findObject(getSelectorForId(id)), DEFAULT_UI_TIMEOUT);
    }

    protected BySelector getSelectorForId(int id) {
        String name = mTargetContext.getResources().getResourceEntryName(id);
        return By.res(mTargetPackage, name);
    }

    protected LauncherActivityInfo getSettingsApp() {
        return LauncherAppsCompat.getInstance(mTargetContext)
                .getActivityList("com.android.settings",
                        Process.myUserHandle()).get(0);
    }

    protected LauncherActivityInfo getChromeApp() {
        return LauncherAppsCompat.getInstance(mTargetContext)
                .getActivityList("com.android.chrome", Process.myUserHandle()).get(0);
    }

    /**
     * Broadcast receiver which blocks until the result is received.
     */
    public class BlockingBroadcastReceiver extends BroadcastReceiver {

        private final CountDownLatch latch = new CountDownLatch(1);
        private Intent mIntent;

        public BlockingBroadcastReceiver(String action) {
            mTargetContext.registerReceiver(this, new IntentFilter(action));
        }

        @Override
        public void onReceive(Context context, Intent intent) {
            mIntent = intent;
            latch.countDown();
        }

        public Intent blockingGetIntent() throws InterruptedException {
            latch.await(DEFAULT_BROADCAST_TIMEOUT_SECS, TimeUnit.SECONDS);
            mTargetContext.unregisterReceiver(this);
            return mIntent;
        }

        public Intent blockingGetExtraIntent() throws InterruptedException {
            Intent intent = blockingGetIntent();
            return intent == null ? null : (Intent) intent.getParcelableExtra(Intent.EXTRA_INTENT);
        }
    }
}