/*
 * Copyright (C) 2023 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.adpf.atom.app;

import static android.adpf.atom.common.ADPFAtomTestConstants.ACTION_CREATE_DEAD_TIDS_THEN_GO_BACKGROUND;
import static android.adpf.atom.common.ADPFAtomTestConstants.ACTION_CREATE_REGULAR_HINT_SESSIONS;
import static android.adpf.atom.common.ADPFAtomTestConstants.CONTENT_KEY_RESULT_TIDS;
import static android.adpf.atom.common.ADPFAtomTestConstants.CONTENT_KEY_UID;
import static android.adpf.atom.common.ADPFAtomTestConstants.CONTENT_URI_STRING;
import static android.adpf.atom.common.ADPFAtomTestConstants.INTENT_ACTION_KEY;

import static org.junit.Assert.assertNotNull;
import static org.junit.Assume.assumeNotNull;

import android.app.Activity;
import android.content.ContentValues;
import android.content.Intent;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.PerformanceHintManager;
import android.os.Process;
import android.util.ArrayMap;
import android.util.Log;

import com.android.compatibility.common.util.PropertyUtil;

import java.util.Map;
import java.util.StringJoiner;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.atomic.AtomicInteger;

/** An activity which performs ADPF actions. */
public class ADPFAtomTestActivity extends Activity {
    private static final String TAG = ADPFAtomTestActivity.class.getSimpleName();


    private final Map<String, Bundle> mResult = new ArrayMap<>();

    private static final int FIRST_API_LEVEL = PropertyUtil.getFirstApiLevel();

    @Override
    public void onCreate(Bundle bundle) {
        super.onCreate(bundle);

        final Intent intent = this.getIntent();
        assertNotNull(intent);
        final String action = intent.getStringExtra(INTENT_ACTION_KEY);
        assertNotNull(action);
        switch (action) {
            case ACTION_CREATE_DEAD_TIDS_THEN_GO_BACKGROUND:
                try {
                    final int[] tids = createHintSessionWithExitedThreads();
                    final StringJoiner sb = new StringJoiner(",");
                    for (int tid : tids) {
                        sb.add(String.valueOf(tid));
                    }
                    ContentValues values = new ContentValues();
                    values.put(CONTENT_KEY_RESULT_TIDS, sb.toString());
                    values.put(CONTENT_KEY_UID, String.valueOf(Process.myUid()));
                    assertNotNull(
                            getContentResolver().insert(Uri.parse(CONTENT_URI_STRING), values));
                } catch (InterruptedException e) {
                    throw new RuntimeException(e);
                }
                moveTaskToBack(true);
                Log.i(TAG, "Moved task ADPFHintSessionDeviceActivity to back");
                break;
            case ACTION_CREATE_REGULAR_HINT_SESSIONS:
                PerformanceHintManager.Session session = createPerformanceHintSession();
                if (FIRST_API_LEVEL < Build.VERSION_CODES.S) {
                    assumeNotNull(session);
                } else {
                    assertNotNull(session);
                }
                break;
        }
    }

    /**
     * Read the run result of a specific action
     */
    public Bundle getRunResult(String actionKey) {
        synchronized (mResult) {
            return mResult.get(actionKey);
        }
    }

    private int[] createHintSessionWithExitedThreads() throws InterruptedException {
        PerformanceHintManager hintManager = getApplicationContext().getSystemService(
                PerformanceHintManager.class);
        assertNotNull(hintManager);
        CountDownLatch stopLatch = new CountDownLatch(1);
        int[] tids = createThreads(5, stopLatch);
        hintManager.createHintSession(tids, 100);
        stopLatch.countDown();
        return tids;
    }

    private int[] createThreads(int tidCnt, CountDownLatch stopLatch) throws InterruptedException {
        int[] tids = new int[tidCnt];
        CountDownLatch latch = new CountDownLatch(tidCnt);
        AtomicInteger k = new AtomicInteger(0);
        for (int i = 0; i < tidCnt; i++) {
            final Thread t = new Thread(() -> {
                tids[k.getAndIncrement()] = android.os.Process.myTid();
                try {
                    latch.countDown();
                    stopLatch.await();
                } catch (InterruptedException e) {
                    throw new RuntimeException(e);
                }
            });
            t.start();
        }
        latch.await();
        return tids;
    }

    private PerformanceHintManager.Session createPerformanceHintSession() {
        final long testTargetDuration = 12345678L;
        PerformanceHintManager hintManager = getApplicationContext().getSystemService(
                PerformanceHintManager.class);
        assertNotNull(hintManager);
        return hintManager.createHintSession(
                new int[]{android.os.Process.myTid()}, testTargetDuration);
    }
}