/*
 * 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 android.view.inputmethod.cts.util;

import static android.view.WindowManager.LayoutParams.SOFT_INPUT_STATE_UNCHANGED;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;

import androidx.annotation.AnyThread;
import androidx.annotation.NonNull;
import androidx.annotation.UiThread;
import androidx.test.InstrumentationRegistry;

import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicReference;
import java.util.function.Function;

public final class TestActivity extends Activity {

    private static final AtomicReference<Function<TestActivity, View>> sInitializer =
            new AtomicReference<>();

    private Function<TestActivity, View> mInitializer = null;

    private AtomicBoolean mIgnoreBackKey = new AtomicBoolean();

    private long mOnBackPressedCallCount;

    /**
     * Controls how {@link #onBackPressed()} behaves.
     *
     * <p>TODO: Use {@link android.app.AppComponentFactory} instead to customise the behavior of
     * {@link TestActivity}.</p>
     *
     * @param ignore {@code true} when {@link TestActivity} should do nothing when
     *               {@link #onBackPressed()} is called
     */
    @AnyThread
    public void setIgnoreBackKey(boolean ignore) {
        mIgnoreBackKey.set(ignore);
    }

    @UiThread
    public long getOnBackPressedCallCount() {
        return mOnBackPressedCallCount;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (mInitializer == null) {
            mInitializer = sInitializer.get();
        }
        // Currently SOFT_INPUT_STATE_UNSPECIFIED isn't appropriate for CTS test because there is no
        // clear spec about how it behaves.  In order to make our tests deterministic, currently we
        // must use SOFT_INPUT_STATE_UNCHANGED.
        // TODO(Bug 77152727): Remove the following code once we define how
        // SOFT_INPUT_STATE_UNSPECIFIED actually behaves.
        setSoftInputState(SOFT_INPUT_STATE_UNCHANGED);
        setContentView(mInitializer.apply(this));
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void onBackPressed() {
        ++mOnBackPressedCallCount;
        if (mIgnoreBackKey.get()) {
            return;
        }
        super.onBackPressed();
    }

    /**
     * Launches {@link TestActivity} with the given initialization logic for content view.
     *
     * <p>As long as you are using {@link androidx.test.runner.AndroidJUnitRunner}, the test
     * runner automatically calls {@link Activity#finish()} for the {@link Activity} launched when
     * the test finished.  You do not need to explicitly call {@link Activity#finish()}.</p>
     *
     * @param activityInitializer initializer to supply {@link View} to be passed to
     *                           {@link Activity#setContentView(View)}
     * @return {@link TestActivity} launched
     */
    public static TestActivity startSync(
            @NonNull Function<TestActivity, View> activityInitializer) {
        return startSync(activityInitializer, 0 /* noAnimation */);
    }

    /**
     * Launches {@link TestActivity} with the given initialization logic for content view.
     *
     * <p>As long as you are using {@link androidx.test.runner.AndroidJUnitRunner}, the test
     * runner automatically calls {@link Activity#finish()} for the {@link Activity} launched when
     * the test finished.  You do not need to explicitly call {@link Activity#finish()}.</p>
     *
     * @param activityInitializer initializer to supply {@link View} to be passed to
     *                           {@link Activity#setContentView(View)}
     * @param additionalFlags flags to be set to {@link Intent#setFlags(int)}
     * @return {@link TestActivity} launched
     */
    public static TestActivity startSync(
            @NonNull Function<TestActivity, View> activityInitializer,
            int additionalFlags) {
        sInitializer.set(activityInitializer);
        final Intent intent = new Intent()
                .setAction(Intent.ACTION_MAIN)
                .setClass(InstrumentationRegistry.getContext(), TestActivity.class)
                .addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
                .addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK)
                .addFlags(additionalFlags);
        return (TestActivity) InstrumentationRegistry
                .getInstrumentation().startActivitySync(intent);
    }

    /**
     * Updates {@link WindowManager.LayoutParams#softInputMode}.
     *
     * @param newState One of {@link WindowManager.LayoutParams#SOFT_INPUT_STATE_UNSPECIFIED},
     *                 {@link WindowManager.LayoutParams#SOFT_INPUT_STATE_UNCHANGED},
     *                 {@link WindowManager.LayoutParams#SOFT_INPUT_STATE_HIDDEN},
     *                 {@link WindowManager.LayoutParams#SOFT_INPUT_STATE_ALWAYS_HIDDEN},
     *                 {@link WindowManager.LayoutParams#SOFT_INPUT_STATE_VISIBLE},
     *                 {@link WindowManager.LayoutParams#SOFT_INPUT_STATE_ALWAYS_VISIBLE}
     */
    private void setSoftInputState(int newState) {
        final Window window = getWindow();
        final int currentSoftInputMode = window.getAttributes().softInputMode;
        final int newSoftInputMode =
                (currentSoftInputMode & ~WindowManager.LayoutParams.SOFT_INPUT_MASK_STATE)
                        | newState;
        window.setSoftInputMode(newSoftInputMode);
    }
}