/*
 * Copyright (C) 2014 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.support.v7.widget;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.support.test.runner.MonitoringInstrumentation;
import android.view.WindowManager;

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;

public class TestActivity extends Activity {
    // This is not great but the only way to do this until test runner adds support to not kill
    // activities after tests.
    private static final String TEST_RUNNER =
            MonitoringInstrumentation.class.getCanonicalName() + "$" + MonitoringInstrumentation
                    .ActivityFinisher.class.getSimpleName();
    private volatile TestedFrameLayout mContainer;
    boolean mVisible;
    boolean mAllowFinish;
    private Handler mHandler;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        overridePendingTransition(0, 0);

        mContainer = new TestedFrameLayout(this);
        mHandler = new Handler(Looper.getMainLooper());

        getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD);
        setContentView(mContainer);
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
    }

    public TestedFrameLayout getContainer() {
        return mContainer;
    }

    public void resetContent() throws InterruptedException {
        final CountDownLatch done = new CountDownLatch(1);
        mHandler.post(new Runnable() {
            @Override
            public void run() {
                mContainer = new TestedFrameLayout(TestActivity.this);
                setContentView(mContainer);
                done.countDown();
            }
        });
        if (!done.await(5, TimeUnit.SECONDS)) {
            throw new AssertionError("could not cleanup activity contents in 5 seconds");
        }
    }

    @Override
    protected void onPause() {
        super.onPause();
        mVisible = false;
    }

    @Override
    public void onResume() {
        super.onResume();
        mVisible = true;
    }

    @Override
    public void finish() {
        if (!mAllowFinish) {
            StackTraceElement[] stackTrace = Thread.currentThread().getStackTrace();
            // this is terrible but easy workaround for selective finishing
            for (StackTraceElement element : stackTrace) {

                if (TEST_RUNNER.equals(element.getClassName())) {
                    // don't allow activity finisher to finish this.
                    return;
                }
            }
        }
        super.finish();
    }

    public void setAllowFinish(boolean allowFinish) {
        mAllowFinish = allowFinish;
    }

    public boolean canBeReUsed() {
        return getWindow() != null && mVisible && !mAllowFinish;
    }
}