package io.autodidact.visibilitytracker;

import android.view.View;
import android.graphics.Rect;
import com.facebook.react.bridge.Callback;
import com.facebook.react.bridge.ReactApplicationContext;
import com.facebook.react.bridge.ReactContextBaseJavaModule;
import com.facebook.react.bridge.ReactMethod;
import com.facebook.react.uimanager.NativeViewHierarchyManager;
import com.facebook.react.uimanager.UIBlock;
import com.facebook.react.uimanager.UIManagerModule;

public class VisibilityTrackerModule extends ReactContextBaseJavaModule {

  public static final String NAME = "VisibilityTracker";

  private final ReactApplicationContext reactContext;

  public VisibilityTrackerModule(ReactApplicationContext reactContext) {
    super(reactContext);
    this.reactContext = reactContext;
  }

  @Override
  public String getName() {
    return NAME;
  }

  @ReactMethod
  public void isViewVisible(final int tag, final Callback success, final Callback failure) {
    try {
      final ReactApplicationContext context = getReactApplicationContext();
      UIManagerModule uiManager = context.getNativeModule(UIManagerModule.class);
      uiManager.addUIBlock(new UIBlock() {
        public void execute(NativeViewHierarchyManager nvhm) {
          try {
            View view = nvhm.resolveView(tag);
            if (view.isShown()) {
              Rect rect = new Rect();
              view.getGlobalVisibleRect(rect);
              double sVisible = rect.width() * rect.height();
              double sTotal = view.getWidth() * view.getHeight();
              success.invoke((100 * sVisible / sTotal) >= 70);
            } else {
              success.invoke(false);
            }
          } catch (Exception e) {
            success.invoke(false);

          }
        }
      });
    } catch (Throwable throwable) {
      failure.invoke(throwable);
    }
  }
}