/**
 * Copyright (c) 2014-present, Facebook, Inc.
 *
 * <p>This source code is licensed under the MIT license found in the LICENSE file in the root
 * directory of this source tree.
 */
package com.facebook.react.testing;

import static com.facebook.react.bridge.UiThreadUtil.runOnUiThread;

import android.content.Intent;
import android.graphics.Bitmap;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.view.View;
import android.view.ViewTreeObserver;
import android.widget.FrameLayout;
import com.facebook.infer.annotation.Assertions;
import com.facebook.react.ReactInstanceManager;
import com.facebook.react.ReactInstanceManagerBuilder;
import com.facebook.react.ReactRootView;
import com.facebook.react.bridge.JSIModule;
import com.facebook.react.bridge.JSIModulePackage;
import com.facebook.react.bridge.JSIModuleProvider;
import com.facebook.react.bridge.JSIModuleSpec;
import com.facebook.react.bridge.JavaScriptContextHolder;
import com.facebook.react.bridge.ReactApplicationContext;
import com.facebook.react.bridge.ReactContext;
import com.facebook.react.bridge.UIManager;
import com.facebook.react.common.LifecycleState;
import com.facebook.react.fabric.FabricUIManager;
import com.facebook.react.fabric.jsc.FabricJSCBinding;
import com.facebook.react.modules.core.DefaultHardwareBackBtnHandler;
import com.facebook.react.modules.core.PermissionAwareActivity;
import com.facebook.react.modules.core.PermissionListener;
import com.facebook.react.shell.MainReactPackage;
import com.facebook.react.testing.idledetection.ReactBridgeIdleSignaler;
import com.facebook.react.testing.idledetection.ReactIdleDetectionUtil;
import com.facebook.react.uimanager.UIManagerModule;
import com.facebook.react.uimanager.ViewManager;
import com.facebook.react.uimanager.ViewManagerRegistry;
import com.facebook.react.uimanager.events.EventDispatcher;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import javax.annotation.Nullable;


public class ReactAppTestActivity extends FragmentActivity
    implements DefaultHardwareBackBtnHandler, PermissionAwareActivity {

  public static final String EXTRA_IS_FABRIC_TEST = "is_fabric_test";

  private static final String DEFAULT_BUNDLE_NAME = "AndroidTestBundle.js";
  private static final int ROOT_VIEW_ID = 8675309;
  // we need a bigger timeout for CI builds because they run on a slow emulator
  private static final long IDLE_TIMEOUT_MS = 120000;
  private final CountDownLatch mDestroyCountDownLatch = new CountDownLatch(1);
  private CountDownLatch mLayoutEvent = new CountDownLatch(1);
  private @Nullable ReactBridgeIdleSignaler mBridgeIdleSignaler;
  private ScreenshotingFrameLayout mScreenshotingFrameLayout;
  private @Nullable ReactInstanceManager mReactInstanceManager;
  private @Nullable ReactRootView mReactRootView;
  private LifecycleState mLifecycleState = LifecycleState.BEFORE_RESUME;

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

    overridePendingTransition(0, 0);

    // We wrap screenshot layout in another FrameLayout in order to handle custom dimensions of the
    // screenshot view set through {@link #setScreenshotDimensions}
    FrameLayout rootView = new FrameLayout(this);
    setContentView(rootView);

    mScreenshotingFrameLayout = new ScreenshotingFrameLayout(this);
    mScreenshotingFrameLayout.setId(ROOT_VIEW_ID);
    rootView.addView(mScreenshotingFrameLayout);

    mReactRootView = new ReactRootView(this);
    Intent intent = getIntent();
    if (intent != null && intent.getBooleanExtra(EXTRA_IS_FABRIC_TEST, false)) {
      mReactRootView.setIsFabric(true);
    }

    mScreenshotingFrameLayout.addView(mReactRootView);
  }

  @Override
  protected void onPause() {
    super.onPause();

    mLifecycleState = LifecycleState.BEFORE_RESUME;

    overridePendingTransition(0, 0);

    if (mReactInstanceManager != null) {
      mReactInstanceManager.onHostPause();
    }
  }

  @Override
  protected void onResume() {
    super.onResume();

    mLifecycleState = LifecycleState.RESUMED;

    if (mReactInstanceManager != null) {
      mReactInstanceManager.onHostResume(this, this);
    }
  }

  @Override
  protected void onDestroy() {
    super.onDestroy();
    mDestroyCountDownLatch.countDown();

    if (mReactInstanceManager != null) {
      mReactInstanceManager.destroy();
      mReactInstanceManager = null;
    }
    if (mReactRootView != null) {
      mReactRootView.unmountReactApplication();
      mReactRootView = null;
    }

    mScreenshotingFrameLayout.clean();
  }

  public void waitForDestroy(long timeoutMs) throws InterruptedException {
    mDestroyCountDownLatch.await(timeoutMs, TimeUnit.MILLISECONDS);
  }

  public void loadApp(String appKey, ReactInstanceSpecForTest spec, boolean enableDevSupport) {
    loadApp(appKey, spec, null, DEFAULT_BUNDLE_NAME, enableDevSupport);
  }

  public void loadApp(String appKey, ReactInstanceSpecForTest spec, String bundleName) {
    loadApp(appKey, spec, null, bundleName, false /* = useDevSupport */);
  }

  public void resetRootViewForScreenshotTests() {
    if (mReactInstanceManager != null) {
      mReactInstanceManager.destroy();
      mReactInstanceManager = null;
    }
    if (mReactRootView != null) {
      mReactRootView.unmountReactApplication();
    }
    mReactRootView = new ReactRootView(this);
    mScreenshotingFrameLayout.removeAllViews();
    mScreenshotingFrameLayout.clean();
    mScreenshotingFrameLayout.addView(mReactRootView);
  }

  public void loadApp(
      String appKey,
      ReactInstanceSpecForTest spec,
      @Nullable Bundle initialProps,
      String bundleName,
      boolean useDevSupport) {
    loadBundle(spec, bundleName, useDevSupport);
    renderComponent(appKey, initialProps);
  }

  public void renderComponent(String appKey) {
    renderComponent(appKey, null);
  }

  public void renderComponent(final String appKey, final @Nullable Bundle initialProps) {
    final CountDownLatch currentLayoutEvent = mLayoutEvent = new CountDownLatch(1);
    runOnUiThread(
        new Runnable() {
          @Override
          public void run() {
            Assertions.assertNotNull(mReactRootView)
                .getViewTreeObserver()
                .addOnGlobalLayoutListener(
                    new ViewTreeObserver.OnGlobalLayoutListener() {
                      @Override
                      public void onGlobalLayout() {
                        currentLayoutEvent.countDown();
                        Assertions.assertNotNull(mReactRootView)
                            .getViewTreeObserver()
                            .removeGlobalOnLayoutListener(this);
                      }
                    });
            Assertions.assertNotNull(mReactRootView)
                .startReactApplication(mReactInstanceManager, appKey, initialProps);
          }
        });
        try {
          waitForBridgeAndUIIdle();
          waitForLayout(5000);
        } catch (InterruptedException e) {
          throw new RuntimeException("Layout never occurred for component " + appKey, e);}
  }

  public void loadBundle(ReactInstanceSpecForTest spec, String bundleName, boolean useDevSupport) {

    mBridgeIdleSignaler = new ReactBridgeIdleSignaler();

    final ReactInstanceManagerBuilder builder =
        ReactTestHelper.getReactTestFactory()
            .getReactInstanceManagerBuilder()
            .setApplication(getApplication())
            .setBundleAssetName(bundleName);
    if (!spec.getAlternativeReactPackagesForTest().isEmpty()) {
      builder.addPackages(spec.getAlternativeReactPackagesForTest());
    } else {
      builder.addPackage(new MainReactPackage());
    }
    builder
        .addPackage(new InstanceSpecForTestPackage(spec))
        // By not setting a JS module name, we force the bundle to be always loaded from
        // assets, not the devserver, even if dev mode is enabled (such as when testing redboxes).
        // This makes sense because we never run the devserver in tests.
        // .setJSMainModuleName()
        .setUseDeveloperSupport(useDevSupport)
        .setBridgeIdleDebugListener(mBridgeIdleSignaler)
        .setInitialLifecycleState(mLifecycleState)
        .setJSIModulesPackage(
            new JSIModulePackage() {
              @Override
              public List<JSIModuleSpec> getJSIModules(
                  final ReactApplicationContext reactApplicationContext,
                  final JavaScriptContextHolder jsContext) {
                return Arrays.<JSIModuleSpec>asList(
                    new JSIModuleSpec() {
                      @Override
                      public Class<? extends JSIModule> getJSIModuleClass() {
                        return UIManager.class;
                      }

                      @Override
                      public JSIModuleProvider getJSIModuleProvider() {
                        return new JSIModuleProvider() {
                          @Override
                          public FabricUIManager get() {
                            List<ViewManager> viewManagers =
                                mReactInstanceManager.getOrCreateViewManagers(
                                    reactApplicationContext);
                            EventDispatcher eventDispatcher =
                                reactApplicationContext
                                    .getNativeModule(UIManagerModule.class)
                                    .getEventDispatcher();
                            FabricUIManager fabricUIManager =
                                new FabricUIManager(
                                    reactApplicationContext,
                                    new ViewManagerRegistry(viewManagers),
                                    jsContext,
                                    eventDispatcher);
                            new FabricJSCBinding().installFabric(jsContext, fabricUIManager);
                            return fabricUIManager;
                          }
                        };
                      }
                    });
              }
            });

    final CountDownLatch latch = new CountDownLatch(1);
    runOnUiThread(
        new Runnable() {
          @Override
          public void run() {
            mReactInstanceManager = builder.build();
            mReactInstanceManager.onHostResume(
                ReactAppTestActivity.this, ReactAppTestActivity.this);
            latch.countDown();
          }
        });
    try {
      latch.await(1000, TimeUnit.MILLISECONDS);
    } catch (InterruptedException e) {

      throw new RuntimeException(
          "ReactInstanceManager never finished initializing " + bundleName, e);
    }
  }

  private ReactInstanceManager getReactInstanceManager() {
    return mReactInstanceManager;
  }

  public boolean waitForLayout(long millis) throws InterruptedException {
    return mLayoutEvent.await(millis, TimeUnit.MILLISECONDS);
  }

  public void waitForBridgeAndUIIdle() {
    waitForBridgeAndUIIdle(IDLE_TIMEOUT_MS);
  }

  public void waitForBridgeAndUIIdle(long timeoutMs) {
    ReactIdleDetectionUtil.waitForBridgeAndUIIdle(
        Assertions.assertNotNull(mBridgeIdleSignaler), getReactContext(), timeoutMs);
  }

  public View getRootView() {
    return Assertions.assertNotNull(mReactRootView);
  }

  public ReactContext getReactContext() {
    return waitForReactContext();
  }

  // Because react context is created asynchronously, we may have to wait until it is available.
  // It's simpler than exposing synchronosition mechanism to notify listener than react context
  // creation has completed.
  private ReactContext waitForReactContext() {
    Assertions.assertNotNull(mReactInstanceManager);

    try {
      while (true) {
        ReactContext reactContext = mReactInstanceManager.getCurrentReactContext();
        if (reactContext != null) {
          return reactContext;
        }
        Thread.sleep(100);
      }
    } catch (InterruptedException e) {
      throw new RuntimeException(e);
    }
  }

  public void postDelayed(Runnable r, int delayMS) {
    getRootView().postDelayed(r, delayMS);
  }

  /**
   * Does not ensure that this is run on the UI thread or that the UI Looper is idle like {@link
   * ReactAppInstrumentationTestCase#getScreenshot()}. You probably want to use that instead.
   */
  public Bitmap getCurrentScreenshot() {
    return mScreenshotingFrameLayout.getLastDrawnBitmap();
  }

  public boolean isScreenshotReady() {
    return mScreenshotingFrameLayout.isScreenshotReady();
  }

  public void setScreenshotDimensions(int width, int height) {
    mScreenshotingFrameLayout.setLayoutParams(new FrameLayout.LayoutParams(width, height));
  }

  @Override
  public void invokeDefaultOnBackPressed() {
    super.onBackPressed();
  }

  @Override
  public void onRequestPermissionsResult(
      int requestCode, String[] permissions, int[] grantResults) {}

  @Override
  public void requestPermissions(
      String[] permissions, int requestCode, PermissionListener listener) {}
}