/*
 * Copyright (C) 2025 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.documentsui.sidebar

import android.content.Context
import android.view.KeyEvent
import android.view.View.OnDragListener
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import androidx.recyclerview.widget.RecyclerView.AdapterDataObserver
import androidx.test.filters.SmallTest
import androidx.test.platform.app.InstrumentationRegistry
import com.android.documentsui.ActionHandler
import com.android.documentsui.ActivityConfig
import com.android.documentsui.BaseActivity
import com.android.documentsui.Injector
import com.android.documentsui.R
import com.android.documentsui.base.Features
import com.android.documentsui.base.RootInfo
import com.android.documentsui.base.State
import com.google.common.truth.Expect
import kotlin.jvm.java
import org.junit.Before
import org.junit.Rule
import org.junit.Test
import org.mockito.Mock
import org.mockito.Mockito.mock
import org.mockito.Mockito.spy
import org.mockito.Mockito.times
import org.mockito.Mockito.verify
import org.mockito.Mockito.`when` as whenever
import org.mockito.MockitoAnnotations

@SmallTest
class RecyclerRootsAdapterTest {

  @Mock private lateinit var activity: BaseActivity
  @Mock private lateinit var dragListener: OnDragListener

  private lateinit var parent: RecyclerView
  private lateinit var adapter: RecyclerRootsAdapter
  private lateinit var items: MutableList<Item>

  @get:Rule val expect = Expect.create()

  @Before
  fun setup() {
    MockitoAnnotations.openMocks(this)
    val context: Context = InstrumentationRegistry.getInstrumentation().targetContext
    parent = RecyclerView(context)
    parent.layoutManager = LinearLayoutManager(context)
    items = mutableListOf()
    adapter = RecyclerRootsAdapter(activity, items, dragListener)
  }

  @Test
  fun testOnBindViewHolder() {
    val mockItem = mock(RootItem::class.java)
    items.add(mockItem)
    val viewHolder = adapter.onCreateViewHolder(parent, 0)

    adapter.onBindViewHolder(viewHolder, 0)

    verify(mockItem).bindView(viewHolder.itemView)
    expect.that(viewHolder.itemView.getTag(R.id.item_position_tag)).isEqualTo(0)
  }

  @Test
  fun testOnBindViewHolder_withSpaceItem() {
    val mockItem = SpacerItem()
    items.add(mockItem)
    val viewHolder = adapter.onCreateViewHolder(parent, 2)

    adapter.onBindViewHolder(viewHolder, 0)

    expect.that(viewHolder.itemView.isEnabled).isFalse()
  }

  @Test
  fun testOnBindViewHolder_withSelectedItem() {
    val mockItem = mock(RootItem::class.java)
    whenever(mockItem.isSelected).thenReturn(true)
    items.add(mockItem)
    val viewHolder = adapter.onCreateViewHolder(parent, 0)

    adapter.onBindViewHolder(viewHolder, 0)

    expect.that(viewHolder.itemView.isActivated).isTrue()
    expect.that(viewHolder.itemView.isSelected).isTrue()
  }

  @Test
  fun testOnBindViewHolder_withUnselectedItem() {
    val mockItem = mock(RootItem::class.java)
    whenever(mockItem.isSelected).thenReturn(false)
    items.add(mockItem)
    val viewHolder = adapter.onCreateViewHolder(parent, 0)

    adapter.onBindViewHolder(viewHolder, 0)

    expect.that(viewHolder.itemView.isActivated).isFalse()
    expect.that(viewHolder.itemView.isSelected).isFalse()
  }

  @Test
  fun testOnBindViewHolder_onClick() {
    // simply mock doesn't work, why?
    val mockItem = spy(RootItem(mock(RootInfo::class.java), mock(ActionHandler::class.java), false))

    adapter.onClick(mockItem)

    verify(mockItem).open()
  }

  @Test
  fun testOnBindViewHolder_onLongClick() {
    val mockItem = mock(RootItem::class.java)
    whenever(activity.displayState).thenReturn(State().apply { action = State.ACTION_GET_CONTENT })

    adapter.onLongClick(mockItem)

    verify(mockItem).showAppDetails()
  }

  @Test
  fun testOnBindViewHolder_onTabKey() {
    val features = mock(Features::class.java)
    whenever(features.isSystemKeyboardNavigationEnabled()).thenReturn(true)
    val injector =
      Injector<ActionHandler>(
        features,
        mock(ActivityConfig::class.java),
        null,
        null,
        null,
        null,
        null
      )
    whenever(activity.getInjector()).thenReturn(injector)
    val event = KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_TAB)

    expect.that(adapter.onKey(KeyEvent.KEYCODE_TAB, event)).isFalse()
  }

  @Test
  fun testOnBindViewHolder_onArrowKey() {
    val leftArrowEvent = KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_DPAD_LEFT)
    expect.that(adapter.onKey(KeyEvent.KEYCODE_DPAD_LEFT, leftArrowEvent)).isTrue()

    val rightArrowEvent = KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_DPAD_RIGHT)
    expect.that(adapter.onKey(KeyEvent.KEYCODE_DPAD_RIGHT, rightArrowEvent)).isTrue()
  }

  @Test
  fun testGetItemViewType_withRootItem() {
    items.add(mock(RootItem::class.java))
    expect.that(adapter.getItemViewType(0)).isEqualTo(0)
  }

  @Test
  fun testGetItemViewType_withNavRailRootItem() {
    items.add(mock(NavRailRootItem::class.java))
    expect.that(adapter.getItemViewType(0)).isEqualTo(1)
  }

  @Test
  fun testGetItemViewType_withSpacerItem() {
    items.add(SpacerItem())
    expect.that(adapter.getItemViewType(0)).isEqualTo(2)
  }

  @Test
  fun testGetItemViewType_withHeaderItem() {
    items.add(HeaderItem("Test"))
    expect.that(adapter.getItemViewType(0)).isEqualTo(3)
  }

  @Test
  fun testSetItemSelected_updatesSelectedItemAndNotifies() {
    val mockItem1 = mock(RootItem::class.java)
    val mockItem2 = mock(RootItem::class.java)
    val observer: AdapterDataObserver = mock(AdapterDataObserver::class.java)
    adapter.registerAdapterDataObserver(observer)
    items.add(mockItem1)
    items.add(mockItem2)

    // Select item 0.
    adapter.setItemSelected(0, true)
    verify(mockItem1).isSelected = true
    verify(observer).onItemRangeChanged(0, 1, null)

    // Select item 1, item 0 should be unselected.
    adapter.setItemSelected(1, true)

    verify(mockItem1).isSelected = false
    verify(mockItem2).isSelected = true
    // Verify both item 1 and item 2 have changed.
    verify(observer, times(2)).onItemRangeChanged(0, 1, null)
    verify(observer).onItemRangeChanged(1, 1, null)
  }

  @Test
  fun testGetItem() {
    val mockItem1 = mock(RootItem::class.java)
    val mockItem2 = mock(RootItem::class.java)
    items.add(mockItem1)
    items.add(mockItem2)

    expect.that(adapter.itemCount).isEqualTo(2)
    expect.that(adapter.getItem(0)).isEqualTo(mockItem1)
    expect.that(adapter.getItem(1)).isEqualTo(mockItem2)
  }
}