/*
 * Copyright (C) 2024 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.launcher3.taskbar

import android.platform.test.annotations.EnableFlags
import android.platform.test.flag.junit.SetFlagsRule
import android.view.View
import androidx.core.view.children
import com.android.launcher3.R
import com.android.launcher3.apppairs.AppPairIcon
import com.android.launcher3.statehandlers.DesktopVisibilityController
import com.android.launcher3.taskbar.TaskbarControllerTestUtil.runOnMainSync
import com.android.launcher3.taskbar.TaskbarIconType.ALL_APPS
import com.android.launcher3.taskbar.TaskbarIconType.DIVIDER
import com.android.launcher3.taskbar.TaskbarIconType.HANDOFF_SUGGESTION
import com.android.launcher3.taskbar.TaskbarIconType.HOTSEAT
import com.android.launcher3.taskbar.TaskbarIconType.OVERFLOW
import com.android.launcher3.taskbar.TaskbarIconType.RECENT
import com.android.launcher3.taskbar.TaskbarViewTestUtil.assertThat
import com.android.launcher3.taskbar.TaskbarViewTestUtil.createHandoffSuggestions
import com.android.launcher3.taskbar.TaskbarViewTestUtil.createHotseatItems
import com.android.launcher3.taskbar.TaskbarViewTestUtil.createRecents
import com.android.launcher3.taskbar.TaskbarViewTestUtil.createSplitTask
import com.android.launcher3.taskbar.rules.TaskbarUnitTestRule
import com.android.launcher3.taskbar.rules.TaskbarUnitTestRule.ForceRtl
import com.android.launcher3.taskbar.rules.TaskbarUnitTestRule.InjectController
import com.android.launcher3.taskbar.rules.TaskbarWindowSandboxContext
import com.android.launcher3.util.LauncherMultivalentJUnit
import com.android.launcher3.util.LauncherMultivalentJUnit.EmulatedDevices
import com.android.window.flags.Flags.FLAG_ENABLE_OVERFLOW_BUTTON_FOR_TASKBAR_PINNED_ITEMS
import com.android.window.flags.Flags.FLAG_ENABLE_TASKBAR_OVERFLOW
import com.google.common.truth.Truth
import org.junit.Before
import org.junit.Ignore
import org.junit.Rule
import org.junit.Test
import org.junit.runner.RunWith
import org.mockito.kotlin.whenever

@RunWith(LauncherMultivalentJUnit::class)
@EmulatedDevices(["pixelFoldable2023", "pixelTablet2023"])
@EnableFlags(FLAG_ENABLE_TASKBAR_OVERFLOW)
class TaskbarViewTest {

    @get:Rule(order = 0) val setFlagsRule = SetFlagsRule()
    @get:Rule(order = 1) val context = TaskbarWindowSandboxContext.create()
    @get:Rule(order = 2) val taskbarUnitTestRule = TaskbarUnitTestRule(this, context)

    @InjectController lateinit var viewController: TaskbarViewController
    private lateinit var taskbarView: TaskbarView

    private val iconViews: Array<View>
        get() = taskbarView.iconViews

    private val desktopVisibilityController: DesktopVisibilityController
        get() = DesktopVisibilityController.INSTANCE[context]

    private val maxShownRecents: Int
        get() = taskbarView.maxNumIconViews - 2 // Account for All Apps and Divider.

    private val maxShownHotseat: Int
        get() = taskbarUnitTestRule.activityContext.taskbarSpecsEvaluator.numShownHotseatIcons

    @Before
    fun obtainView() {
        taskbarView = taskbarUnitTestRule.activityContext.dragLayer.findViewById(R.id.taskbar_view)
    }

    @Test
    fun testUpdateItems_noItems_hasOnlyAllApps() {
        runOnMainSync { taskbarView.updateItems(emptyArray(), emptyList(), emptyList()) }
        assertThat(taskbarView).hasIconTypes(ALL_APPS)
    }

    @Test
    fun testUpdateItems_hotseatItems_hasDividerBetweenAllAppsAndHotseat() {
        runOnMainSync { taskbarView.updateItems(createHotseatItems(2), emptyList(), emptyList()) }
        assertThat(taskbarView).hasIconTypes(ALL_APPS, DIVIDER, HOTSEAT, HOTSEAT)
    }

    @Test
    @ForceRtl
    fun testUpdateItems_rtlWithHotseatItems_hasDividerBetweenHotseatAndAllApps() {
        runOnMainSync { taskbarView.updateItems(createHotseatItems(2), emptyList(), emptyList()) }
        assertThat(taskbarView).hasIconTypes(HOTSEAT, HOTSEAT, DIVIDER, ALL_APPS)
    }

    @Test
    fun testUpdateItems_withNullHotseatItem_filtersNullItem() {
        runOnMainSync {
            taskbarView.updateItems(arrayOf(*createHotseatItems(2), null), emptyList(), emptyList())
        }
        assertThat(taskbarView).hasIconTypes(ALL_APPS, DIVIDER, HOTSEAT, HOTSEAT)
    }

    @Test
    @ForceRtl
    fun testUpdateItems_rtlWithNullHotseatItem_filtersNullItem() {
        runOnMainSync {
            taskbarView.updateItems(arrayOf(*createHotseatItems(2), null), emptyList(), emptyList())
        }
        assertThat(taskbarView).hasIconTypes(HOTSEAT, HOTSEAT, DIVIDER, ALL_APPS)
    }

    @Test
    fun testUpdateItems_recentsItems_hasDividerBetweenAllAppsAndRecents() {
        runOnMainSync { taskbarView.updateItems(emptyArray(), createRecents(4), emptyList()) }
        assertThat(taskbarView).hasIconTypes(ALL_APPS, DIVIDER, *RECENT * 4)
    }

    @Test
    fun testUpdateItems_hotseatItemsAndRecents_hasDividerBetweenHotseatAndRecents() {
        runOnMainSync {
            taskbarView.updateItems(createHotseatItems(3), createRecents(2), emptyList())
        }
        assertThat(taskbarView).hasIconTypes(ALL_APPS, *HOTSEAT * 3, DIVIDER, *RECENT * 2)
    }

    @Test
    fun testUpdateItems_addHotseatItem_updatesHotseat() {
        runOnMainSync {
            taskbarView.updateItems(
                createHotseatItems(1),
                createRecents(1),
                createHandoffSuggestions(1),
            )
            taskbarView.updateItems(
                createHotseatItems(2),
                createRecents(1),
                createHandoffSuggestions(1),
            )
        }
        assertThat(taskbarView)
            .hasIconTypes(ALL_APPS, *HOTSEAT * 2, DIVIDER, RECENT, HANDOFF_SUGGESTION)
    }

    @Test
    fun testUpdateItems_removeHotseatItem_updatesHotseat() {
        runOnMainSync {
            taskbarView.updateItems(
                createHotseatItems(2),
                createRecents(1),
                createHandoffSuggestions(1),
            )
            taskbarView.updateItems(
                createHotseatItems(1),
                createRecents(1),
                createHandoffSuggestions(1),
            )
        }
        assertThat(taskbarView).hasIconTypes(ALL_APPS, HOTSEAT, DIVIDER, RECENT, HANDOFF_SUGGESTION)
    }

    @Test
    fun testUpdateItems_addRecentsItem_updatesRecents() {
        runOnMainSync {
            taskbarView.updateItems(
                createHotseatItems(1),
                createRecents(1),
                createHandoffSuggestions(1),
            )
            taskbarView.updateItems(
                createHotseatItems(1),
                createRecents(2),
                createHandoffSuggestions(1),
            )
        }
        assertThat(taskbarView)
            .hasIconTypes(ALL_APPS, HOTSEAT, DIVIDER, *RECENT * 2, HANDOFF_SUGGESTION)
    }

    @Test
    fun testUpdateItems_removeRecentsItem_updatesRecents() {
        runOnMainSync {
            taskbarView.updateItems(
                createHotseatItems(1),
                createRecents(2),
                createHandoffSuggestions(1),
            )
            taskbarView.updateItems(
                createHotseatItems(1),
                createRecents(1),
                createHandoffSuggestions(1),
            )
        }
        assertThat(taskbarView).hasIconTypes(ALL_APPS, HOTSEAT, DIVIDER, RECENT, HANDOFF_SUGGESTION)
    }

    @Test
    fun testUpdateItems_addHandoffSuggestion_updatesHandoffSuggestions() {
        runOnMainSync {
            taskbarView.updateItems(createHotseatItems(1), createRecents(1), emptyList())
            taskbarView.updateItems(
                createHotseatItems(1),
                createRecents(1),
                createHandoffSuggestions(1),
            )
        }
        assertThat(taskbarView).hasIconTypes(ALL_APPS, HOTSEAT, DIVIDER, RECENT, HANDOFF_SUGGESTION)
    }

    @Test
    fun testUpdateItems_removeHandoffSuggestion_updatesHandoffSuggestions() {
        runOnMainSync {
            taskbarView.updateItems(
                createHotseatItems(1),
                createRecents(1),
                createHandoffSuggestions(1),
            )
            taskbarView.updateItems(createHotseatItems(1), createRecents(1), emptyList())
        }
        assertThat(taskbarView).hasIconTypes(ALL_APPS, HOTSEAT, DIVIDER, RECENT)
    }

    @Test
    fun testUpdateItem_addHotseatItemAfterRecentsItem_hotseatItemBeforeDivider() {
        runOnMainSync {
            taskbarView.updateItems(emptyArray(), createRecents(1), emptyList())
            taskbarView.updateItems(createHotseatItems(1), createRecents(1), emptyList())
        }
        assertThat(taskbarView).hasIconTypes(ALL_APPS, HOTSEAT, DIVIDER, RECENT)
    }

    @Test
    @ForceRtl
    fun testUpdateItems_rtl_hotseatItems_hasDividerBetweenHotseatAndAllApps() {
        runOnMainSync { taskbarView.updateItems(createHotseatItems(2), emptyList(), emptyList()) }
        assertThat(taskbarView).hasIconTypes(*HOTSEAT * 2, DIVIDER, ALL_APPS)
    }

    @Test
    @ForceRtl
    fun testUpdateItems_rtl_recentsItems_hasDividerBetweenRecentsAndAllApps() {
        runOnMainSync { taskbarView.updateItems(emptyArray(), createRecents(4), emptyList()) }
        assertThat(taskbarView).hasIconTypes(*RECENT * 4, DIVIDER, ALL_APPS)
    }

    @Test
    @ForceRtl
    fun testUpdateItems_rtl_recentsItems_recentsAreReversed() {
        runOnMainSync { taskbarView.updateItems(emptyArray(), createRecents(4), emptyList()) }
        assertThat(taskbarView).hasRecentsOrder(startIndex = 0, expectedIds = listOf(3, 2, 1, 0))
    }

    @Test
    @ForceRtl
    fun testUpdateItems_rtl_hotseatItemsAndRecents_hasDividerBetweenRecentsAndHotseat() {
        runOnMainSync {
            taskbarView.updateItems(createHotseatItems(3), createRecents(2), emptyList())
        }
        assertThat(taskbarView).hasIconTypes(*RECENT * 2, DIVIDER, *HOTSEAT * 3, ALL_APPS)
    }

    @Test
    @ForceRtl
    fun testUpdateItems_rtl_addHotseatItemWithoutRecents_updatesHotseat() {
        runOnMainSync {
            taskbarView.updateItems(createHotseatItems(1), emptyList(), emptyList())
            taskbarView.updateItems(createHotseatItems(2), emptyList(), emptyList())
        }
        assertThat(taskbarView).hasIconTypes(*HOTSEAT * 2, DIVIDER, ALL_APPS)
    }

    @Test
    @ForceRtl
    fun testUpdateItems_rtl_addHotseatItemWithRecents_updatesHotseat() {
        runOnMainSync {
            taskbarView.updateItems(createHotseatItems(1), createRecents(1), emptyList())
            taskbarView.updateItems(createHotseatItems(2), createRecents(1), emptyList())
        }
        assertThat(taskbarView).hasIconTypes(RECENT, DIVIDER, *HOTSEAT * 2, ALL_APPS)
    }

    @Test
    @ForceRtl
    fun testUpdateItems_rtl_removeHotseatItem_updatesHotseat() {
        runOnMainSync {
            taskbarView.updateItems(createHotseatItems(2), createRecents(1), emptyList())
            taskbarView.updateItems(createHotseatItems(1), createRecents(1), emptyList())
        }
        assertThat(taskbarView).hasIconTypes(RECENT, DIVIDER, HOTSEAT, ALL_APPS)
    }

    @Test
    @ForceRtl
    fun testUpdateItems_rtl_addRecentsItem_updatesRecents() {
        runOnMainSync {
            taskbarView.updateItems(createHotseatItems(1), createRecents(1), emptyList())
            taskbarView.updateItems(createHotseatItems(1), createRecents(2), emptyList())
        }
        assertThat(taskbarView).hasIconTypes(*RECENT * 2, DIVIDER, HOTSEAT, ALL_APPS)
    }

    @Test
    @ForceRtl
    fun testUpdateItems_rtl_removeRecentsItem_updatesRecents() {
        runOnMainSync {
            taskbarView.updateItems(createHotseatItems(1), createRecents(2), emptyList())
            taskbarView.updateItems(createHotseatItems(1), createRecents(1), emptyList())
        }
        assertThat(taskbarView).hasIconTypes(RECENT, DIVIDER, HOTSEAT, ALL_APPS)
    }

    @Test
    fun testUpdateItems_addRecentsItem_viewAddedOnRight() {
        runOnMainSync {
            taskbarView.updateItems(emptyArray(), createRecents(1), emptyList())
            val prevIconViews = iconViews

            val newRecents = createRecents(2)
            taskbarView.updateItems(emptyArray(), newRecents, emptyList())

            assertThat(taskbarView).hasRecentsOrder(startIndex = 2, expectedIds = listOf(0, 1))
            Truth.assertThat(iconViews[2]).isSameInstanceAs(prevIconViews[2])
            Truth.assertThat(iconViews.last() in prevIconViews).isFalse()
        }
    }

    @Test
    @ForceRtl
    fun testUpdateItems_rtl_addRecentsItem_viewAddedOnLeft() {
        runOnMainSync {
            taskbarView.updateItems(emptyArray(), createRecents(1), emptyList())
            val prevIconViews = iconViews

            val newRecents = createRecents(2)
            taskbarView.updateItems(emptyArray(), newRecents, emptyList())

            assertThat(taskbarView).hasRecentsOrder(startIndex = 0, expectedIds = listOf(1, 0))
            Truth.assertThat(iconViews[1]).isSameInstanceAs(prevIconViews.first())
            Truth.assertThat(iconViews.first() in prevIconViews).isFalse()
        }
    }

    @Test
    fun testUpdateItems_removeFirstRecentsItem_correspondingViewRemoved() {
        runOnMainSync {
            val recents = createRecents(2)
            taskbarView.updateItems(emptyArray(), recents, emptyList())

            val expectedViewToRemove = iconViews[2]
            Truth.assertThat(expectedViewToRemove.tag).isEqualTo(recents.first())

            taskbarView.updateItems(emptyArray(), listOf(recents.last()), emptyList())
            Truth.assertThat(expectedViewToRemove in iconViews).isFalse()
        }
    }

    @Test
    fun testUpdateItems_removeLastRecentsItem_correspondingViewRemoved() {
        runOnMainSync {
            val recents = createRecents(2)
            taskbarView.updateItems(emptyArray(), recents, emptyList())

            val expectedViewToRemove = iconViews[3]
            Truth.assertThat(expectedViewToRemove.tag).isEqualTo(recents.last())

            taskbarView.updateItems(emptyArray(), listOf(recents.first()), emptyList())
            Truth.assertThat(expectedViewToRemove in iconViews).isFalse()
        }
    }

    @Test
    @ForceRtl
    fun testUpdateItems_rtl_removeFirstRecentsItem_correspondingViewRemoved() {
        runOnMainSync {
            val recents = createRecents(2)
            taskbarView.updateItems(emptyArray(), recents, emptyList())

            val expectedViewToRemove = iconViews[1]
            Truth.assertThat(expectedViewToRemove.tag).isEqualTo(recents.first())

            taskbarView.updateItems(emptyArray(), listOf(recents.last()), emptyList())
            Truth.assertThat(expectedViewToRemove in iconViews).isFalse()
        }
    }

    @Test
    @ForceRtl
    fun testUpdateItems_rtl_removeLastRecentsItem_correspondingViewRemoved() {
        runOnMainSync {
            val recents = createRecents(2)
            taskbarView.updateItems(emptyArray(), recents, emptyList())

            val expectedViewToRemove = iconViews[0]
            Truth.assertThat(expectedViewToRemove.tag).isEqualTo(recents.last())

            taskbarView.updateItems(emptyArray(), listOf(recents.first()), emptyList())
            Truth.assertThat(expectedViewToRemove in iconViews).isFalse()
        }
    }

    @Test
    fun testUpdateItems_desktopMode_hotseatItem_noDivider() {
        whenever(desktopVisibilityController.isInDesktopMode(context.displayId)).thenReturn(true)
        runOnMainSync { taskbarView.updateItems(createHotseatItems(1), emptyList(), emptyList()) }
        assertThat(taskbarView).hasIconTypes(ALL_APPS, HOTSEAT)
    }

    @Test
    @Ignore("b/435259563")
    fun testUpdateItems_desktopMode_hotseatItem_noDividerAfterDesktopModeChange() {
        whenever(desktopVisibilityController.isInDesktopMode(context.displayId)).thenReturn(false)
        runOnMainSync { taskbarView.updateItems(createHotseatItems(1), emptyList(), emptyList()) }

        whenever(desktopVisibilityController.isInDesktopMode(context.displayId)).thenReturn(true)
        runOnMainSync { taskbarView.updateItems(createHotseatItems(2), emptyList(), emptyList()) }

        assertThat(taskbarView).hasIconTypes(ALL_APPS, HOTSEAT, HOTSEAT)
    }

    @Test
    @ForceRtl
    fun testUpdateItems_rtlAndDesktopMode_hotseatItem_noDivider() {
        whenever(desktopVisibilityController.isInDesktopMode(context.displayId)).thenReturn(true)
        runOnMainSync { taskbarView.updateItems(createHotseatItems(1), emptyList(), emptyList()) }
        assertThat(taskbarView).hasIconTypes(HOTSEAT, ALL_APPS)
    }

    @Test
    fun testUpdateItems_desktopMode_recentItem_hasDivider() {
        whenever(desktopVisibilityController.isInDesktopMode(context.displayId)).thenReturn(true)
        runOnMainSync { taskbarView.updateItems(emptyArray(), createRecents(1), emptyList()) }
        assertThat(taskbarView).hasIconTypes(ALL_APPS, DIVIDER, RECENT)
    }

    @Test
    @ForceRtl
    fun testUpdateItems_rtlAndDesktopMode_recentItem_hasDivider() {
        whenever(desktopVisibilityController.isInDesktopMode(context.displayId)).thenReturn(true)
        runOnMainSync { taskbarView.updateItems(emptyArray(), createRecents(1), emptyList()) }
        assertThat(taskbarView).hasIconTypes(RECENT, DIVIDER, ALL_APPS)
    }

    @Test
    fun testUpdateItems_maxRecents_noOverflow() {
        runOnMainSync {
            taskbarView.updateItems(emptyArray(), createRecents(maxShownRecents), emptyList())
        }
        assertThat(taskbarView).hasIconTypes(ALL_APPS, DIVIDER, *RECENT * maxShownRecents)
    }

    @Test
    fun testUpdateItems_moreThanMaxRecents_overflowShownBeforeRecents() {
        val recentsSize = maxShownRecents + 2
        runOnMainSync {
            taskbarView.updateItems(emptyArray(), createRecents(recentsSize), emptyList())
        }

        val expectedNumRecents = RECENT * getExpectedNumRecentsWithOverflow()
        assertThat(taskbarView).hasIconTypes(ALL_APPS, DIVIDER, OVERFLOW, *expectedNumRecents)
    }

    @Test
    fun testUpdateItems_clearAllRecentsAfterOverflow_recentsEmpty() {
        val recentsSize = maxShownRecents + 2
        runOnMainSync {
            taskbarView.updateItems(emptyArray(), createRecents(recentsSize), emptyList())
            taskbarView.updateItems(emptyArray(), emptyList(), emptyList())
        }

        assertThat(taskbarView).hasIconTypes(ALL_APPS)
    }

    @Test
    @ForceRtl
    fun testUpdateItems_rtl_moreThanMaxRecents_overflowShownAfterRecents() {
        val recentsSize = maxShownRecents + 2
        runOnMainSync {
            taskbarView.updateItems(emptyArray(), createRecents(recentsSize), emptyList())
        }

        val expectedRecents = RECENT * getExpectedNumRecentsWithOverflow()
        assertThat(taskbarView).hasIconTypes(*expectedRecents, OVERFLOW, DIVIDER, ALL_APPS)
    }

    @Test
    fun testUpdateItems_moreThanMaxRecentsWithHotseat_fewerRecentsShown() {
        val hotseatSize = 4
        val recentsSize = maxShownRecents + 2
        runOnMainSync {
            taskbarView.updateItems(
                createHotseatItems(hotseatSize),
                createRecents(recentsSize),
                emptyList(),
            )
        }

        val expectedRecents = RECENT * getExpectedNumRecentsWithOverflow(hotseatSize)
        assertThat(taskbarView)
            .hasIconTypes(ALL_APPS, *HOTSEAT * hotseatSize, DIVIDER, OVERFLOW, *expectedRecents)
    }

    @Test
    @ForceRtl
    fun testUpdateItems_rtl_moreThanMaxRecentsWithHotseat_fewerRecentsShown() {
        val hotseatSize = 4
        val recentsSize = maxShownRecents + 2
        runOnMainSync {
            taskbarView.updateItems(
                createHotseatItems(hotseatSize),
                createRecents(recentsSize),
                emptyList(),
            )
        }

        val expectedRecents = RECENT * getExpectedNumRecentsWithOverflow(hotseatSize)
        assertThat(taskbarView)
            .hasIconTypes(*expectedRecents, OVERFLOW, DIVIDER, *HOTSEAT * hotseatSize, ALL_APPS)
    }

    @Test
    fun testUpdateItems_moreThanMaxRecents_verifyShownRecentsOrder() {
        val recentsSize = maxShownRecents + 2
        runOnMainSync {
            taskbarView.updateItems(emptyArray(), createRecents(recentsSize), emptyList())
        }

        val expectedNumRecents = getExpectedNumRecentsWithOverflow()
        assertThat(taskbarView)
            .hasRecentsOrder(
                startIndex = iconViews.size - expectedNumRecents,
                expectedIds = ((recentsSize - expectedNumRecents)..<recentsSize).toList(),
            )
    }

    @Test
    @ForceRtl
    fun testUpdateItems_rtl_moreThanMaxRecents_verifyShownRecentsReversed() {
        val recentsSize = maxShownRecents + 2
        runOnMainSync {
            taskbarView.updateItems(emptyArray(), createRecents(recentsSize), emptyList())
        }

        val expectedNumRecents = getExpectedNumRecentsWithOverflow()
        assertThat(taskbarView)
            .hasRecentsOrder(
                startIndex = 0,
                expectedIds = ((recentsSize - expectedNumRecents)..<recentsSize).toList().reversed(),
            )
    }

    @Test
    fun testUpdateItems_splitTask_addsAppPairIconToTaskbar() {
        runOnMainSync {
            taskbarView.updateItems(emptyArray(), listOf(createSplitTask()), emptyList())
        }

        val icon = taskbarView.children.last()
        Truth.assertThat(icon).isInstanceOf(AppPairIcon::class.java)
    }

    @Test
    fun testUpdateItems_withExistingSplitTask_appPairIconIsSameInstance() {
        val splitTask = createSplitTask()
        runOnMainSync { taskbarView.updateItems(emptyArray(), listOf(splitTask), emptyList()) }
        val appPairIcon1 = taskbarView.children.last()

        runOnMainSync { taskbarView.updateItems(emptyArray(), listOf(splitTask), emptyList()) }
        val appPairIcon2 = taskbarView.children.last()

        Truth.assertThat(appPairIcon1).isSameInstanceAs(appPairIcon2)
    }

    @Test
    fun testUpdateItems_splitTaskReplaced_appPairIconReplaced() {
        runOnMainSync {
            taskbarView.updateItems(emptyArray(), listOf(createSplitTask(0)), emptyList())
        }

        val appPairIcon1 = taskbarView.children.last()

        runOnMainSync {
            taskbarView.updateItems(emptyArray(), listOf(createSplitTask(1)), emptyList())
        }

        val appPairIcon2 = taskbarView.children.last()

        Truth.assertThat(appPairIcon1).isNotSameInstanceAs(appPairIcon2)
        Truth.assertThat(appPairIcon1.parent).isNull()
    }

    @Test
    fun testOnTaskUpdated_splitTask_bottomRightTaskTitleChanged_updatesTitle() {
        val splitTask = createSplitTask()
        val expectedTitle1 =
            context.getString(
                R.string.app_pair_default_title,
                splitTask.topLeftTask.title,
                splitTask.bottomRightTask.title,
            )
        runOnMainSync { taskbarView.updateItems(emptyArray(), listOf(splitTask), emptyList()) }

        val icon = taskbarView.children.last() as AppPairIcon
        Truth.assertThat(icon.titleTextView.text).isEqualTo(expectedTitle1)

        val newTitle = "Task1b"
        splitTask.bottomRightTask.title = newTitle
        val expectedTitle2 =
            context.getString(
                R.string.app_pair_default_title,
                splitTask.topLeftTask.title,
                newTitle,
            )

        runOnMainSync { viewController.onTaskUpdated(splitTask.bottomRightTask, splitTask) }
        Truth.assertThat(icon.titleTextView.text).isEqualTo(expectedTitle2)
    }

    @Test
    @EnableFlags(FLAG_ENABLE_OVERFLOW_BUTTON_FOR_TASKBAR_PINNED_ITEMS)
    fun testUpdateItems_hotseatOverflow_noRecents() {
        runOnMainSync {
            taskbarView.updateItems(
                createHotseatItems(maxShownHotseat + 1),
                emptyList(),
                emptyList(),
            )
        }
        assertThat(taskbarView)
            .hasIconTypes(ALL_APPS, DIVIDER, *HOTSEAT * (maxShownHotseat - 1), OVERFLOW)
    }

    @Test
    @EnableFlags(FLAG_ENABLE_OVERFLOW_BUTTON_FOR_TASKBAR_PINNED_ITEMS)
    @ForceRtl
    fun testUpdateItems_rtl_hotseatOverflow_noRecents() {
        runOnMainSync {
            taskbarView.updateItems(
                createHotseatItems(maxShownHotseat + 1),
                emptyList(),
                emptyList(),
            )
        }
        assertThat(taskbarView)
            .hasIconTypes(OVERFLOW, *HOTSEAT * (maxShownHotseat - 1), DIVIDER, ALL_APPS)
    }

    @Test
    @EnableFlags(FLAG_ENABLE_OVERFLOW_BUTTON_FOR_TASKBAR_PINNED_ITEMS)
    fun testUpdateItems_hotseatAndRecentsOverflow() {
        val recentsSize = maxShownRecents + 2
        runOnMainSync {
            taskbarView.updateItems(
                createHotseatItems(maxShownHotseat + 1),
                createRecents(recentsSize),
                emptyList(),
            )
        }
        assertThat(taskbarView)
            .hasIconTypes(
                ALL_APPS,
                *HOTSEAT * (maxShownHotseat - 1),
                OVERFLOW,
                DIVIDER,
                OVERFLOW,
                *RECENT * getExpectedNumRecentsWithOverflow(maxShownHotseat),
            )
    }

    @Test
    @EnableFlags(FLAG_ENABLE_OVERFLOW_BUTTON_FOR_TASKBAR_PINNED_ITEMS)
    @ForceRtl
    fun testUpdateItems_rtl_hotseatAndRecentsOverflow() {
        val recentsSize = maxShownRecents + 2
        runOnMainSync {
            taskbarView.updateItems(
                createHotseatItems(maxShownHotseat + 1),
                createRecents(recentsSize),
                emptyList(),
            )
        }
        assertThat(taskbarView)
            .hasIconTypes(
                *RECENT * getExpectedNumRecentsWithOverflow(maxShownHotseat),
                OVERFLOW,
                DIVIDER,
                OVERFLOW,
                *HOTSEAT * (maxShownHotseat - 1),
                ALL_APPS,
            )
    }

    /** Returns the number of expected recents outside of the overflow based on [hotseatSize]. */
    private fun getExpectedNumRecentsWithOverflow(hotseatSize: Int = 0): Int {
        return 0.coerceAtLeast(maxShownRecents - hotseatSize - 1)
    }
}