/*
 * Copyright (C) 2015 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 com.android.setupwizardlib.items;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertSame;
import static org.junit.Assert.assertTrue;
import static org.mockito.Matchers.anyObject;
import static org.mockito.Matchers.eq;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.verify;

import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.GradientDrawable;
import android.graphics.drawable.ShapeDrawable;
import android.graphics.drawable.shapes.RectShape;
import androidx.recyclerview.widget.RecyclerView.AdapterDataObserver;
import android.widget.FrameLayout;
import android.support.test.InstrumentationRegistry;
import android.support.test.filters.SmallTest;
import android.support.test.runner.AndroidJUnit4;
import com.android.setupwizardlib.items.RecyclerItemAdapter.PatchedLayerDrawable;
import com.android.setupwizardlib.test.R;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;

@RunWith(AndroidJUnit4.class)
@SmallTest
public class RecyclerItemAdapterTest {

  private Item[] mItems = new Item[5];
  private ItemGroup mItemGroup = new ItemGroup();

  @Before
  public void setUp() throws Exception {
    for (int i = 0; i < 5; i++) {
      Item item = new Item();
      item.setTitle("TestTitle" + i);
      item.setId(i);
      // Layout resource: 0 -> 1, 1 -> 11, 2 -> 21, 3 -> 1, 4 -> 11.
      // (Resource IDs cannot be 0)
      item.setLayoutResource((i % 3) * 10 + 1);
      mItems[i] = item;
      mItemGroup.addChild(item);
    }
  }

  @Test
  public void testAdapter() {
    RecyclerItemAdapter adapter = new RecyclerItemAdapter(mItemGroup);
    assertEquals("Adapter should have 5 items", 5, adapter.getItemCount());
    assertEquals("Adapter should return the first item", mItems[0], adapter.getItem(0));
    assertEquals("ID should be same as position", 2, adapter.getItemId(2));

    // ViewType is same as layout resource for RecyclerItemAdapter
    assertEquals("Second item should have view type 21", 21, adapter.getItemViewType(2));
  }

  @Test
  public void testGetRootItemHierarchy() {
    RecyclerItemAdapter adapter = new RecyclerItemAdapter(mItemGroup);
    ItemHierarchy root = adapter.getRootItemHierarchy();
    assertSame("Root item hierarchy should be mItemGroup", mItemGroup, root);
  }

  @Test
  public void testPatchedLayerDrawableNoPadding() {
    ShapeDrawable child = new ShapeDrawable(new RectShape());
    child.setPadding(0, 0, 0, 0);
    PatchedLayerDrawable drawable = new PatchedLayerDrawable(new Drawable[] {child});

    Rect padding = new Rect();
    assertFalse("Patched layer drawable should not have padding", drawable.getPadding(padding));
    assertEquals(new Rect(0, 0, 0, 0), padding);
  }

  @Test
  public void testPatchedLayerDrawableWithPadding() {
    ShapeDrawable child = new ShapeDrawable(new RectShape());
    child.setPadding(10, 10, 10, 10);
    PatchedLayerDrawable drawable = new PatchedLayerDrawable(new Drawable[] {child});

    Rect padding = new Rect();
    assertTrue("Patched layer drawable should have padding", drawable.getPadding(padding));
    assertEquals(new Rect(10, 10, 10, 10), padding);
  }

  @Test
  public void testAdapterNotifications() {
    RecyclerItemAdapter adapter = new RecyclerItemAdapter(mItemGroup);
    final AdapterDataObserver observer = mock(AdapterDataObserver.class);
    adapter.registerAdapterDataObserver(observer);

    mItems[0].setTitle("Child 1");
    verify(observer).onItemRangeChanged(eq(0), eq(1), anyObject());

    mItemGroup.removeChild(mItems[1]);
    verify(observer).onItemRangeRemoved(eq(1), eq(1));

    mItemGroup.addChild(mItems[1]);
    verify(observer).onItemRangeInserted(eq(4), eq(1));
  }

  @Test
  public void testCreateViewHolder() {
    RecyclerItemAdapter adapter = new RecyclerItemAdapter(mItemGroup);
    FrameLayout parent = new FrameLayout(InstrumentationRegistry.getContext());

    final ItemViewHolder viewHolder = adapter.onCreateViewHolder(parent, R.layout.test_list_item);
    assertNotNull("Background should be set", viewHolder.itemView.getBackground());
    assertEquals("foobar", viewHolder.itemView.getTag());
  }

  @Test
  public void testCreateViewHolderNoBackground() {
    RecyclerItemAdapter adapter = new RecyclerItemAdapter(mItemGroup);
    FrameLayout parent = new FrameLayout(InstrumentationRegistry.getContext());

    final ItemViewHolder viewHolder =
        adapter.onCreateViewHolder(parent, R.layout.test_list_item_no_background);
    assertNull("Background should be null", viewHolder.itemView.getBackground());
  }

  @Test
  public void testCreateViewHolderWithExistingBackground() {
    RecyclerItemAdapter adapter = new RecyclerItemAdapter(mItemGroup);
    FrameLayout parent = new FrameLayout(InstrumentationRegistry.getContext());

    final ItemViewHolder viewHolder =
        adapter.onCreateViewHolder(parent, R.layout.test_existing_background);
    Drawable background = viewHolder.itemView.getBackground();
    assertTrue(background instanceof PatchedLayerDrawable);

    PatchedLayerDrawable layerDrawable = (PatchedLayerDrawable) background;
    assertTrue(layerDrawable.getDrawable(0) instanceof GradientDrawable);
  }
}