/*
 *  Copyright (c) 2018-present, Facebook, Inc.
 *
 *  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.sonar.plugins.inspector;

import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.view.View;

/**
 * A singleton instance of a overlay drawable used for highlighting node bounds. See {@link
 * NodeDescriptor#setHighlighted(Object, boolean)}.
 */
public class HighlightedOverlay {
  private static final boolean VIEW_OVERLAY_SUPPORT =
      Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2;

  /**
   * Highlights a particular view with its content bounds, padding and margin dimensions
   *
   * @param targetView The view to apply the highlight on
   * @param margin A {@link Rect} containing the margin values
   * @param padding A {@link Rect} containing the padding values
   * @param contentBounds The {@link Rect} bounds of the content, which includes padding
   */
  public static void setHighlighted(
      View targetView, Rect margin, Rect padding, Rect contentBounds) {
    if (!VIEW_OVERLAY_SUPPORT) {
      return;
    }

    contentBounds.set(
        contentBounds.left + padding.left,
        contentBounds.top + padding.top,
        contentBounds.right - padding.right,
        contentBounds.bottom - padding.bottom);

    padding = enclose(padding, contentBounds);
    margin = enclose(margin, padding);

    final float density = targetView.getContext().getResources().getDisplayMetrics().density;
    final Drawable overlay = BoundsDrawable.getInstance(density, margin, padding, contentBounds);
    targetView.getOverlay().add(overlay);
  }

  public static void removeHighlight(View targetView) {
    if (!VIEW_OVERLAY_SUPPORT) {
      return;
    }

    final float density = targetView.getContext().getResources().getDisplayMetrics().density;
    final Drawable overlay = BoundsDrawable.getInstance(density);
    targetView.getOverlay().remove(overlay);
  }

  private static Rect enclose(Rect parent, Rect child) {
    return new Rect(
        child.left - parent.left,
        child.top - parent.top,
        child.right + parent.right,
        child.bottom + parent.bottom);
  }
}