/*
 * Copyright 2023 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 androidx.compose.foundation.lazy.list

import androidx.compose.foundation.focusable
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.lazy.LazyRow
import androidx.compose.runtime.SideEffect
import androidx.compose.ui.Modifier
import androidx.compose.ui.focus.FocusDirection
import androidx.compose.ui.focus.FocusManager
import androidx.compose.ui.platform.LocalFocusManager
import androidx.compose.ui.platform.testTag
import androidx.compose.ui.test.junit4.createComposeRule
import androidx.compose.ui.test.onNodeWithTag
import androidx.compose.ui.test.requestFocus
import androidx.test.ext.junit.runners.AndroidJUnit4
import androidx.test.filters.MediumTest
import com.google.common.truth.Truth.assertThat
import org.junit.Rule
import org.junit.Test
import org.junit.runner.RunWith

@MediumTest
@RunWith(AndroidJUnit4::class)
class LazyListFocusMoveCompositionCountTest {

    @get:Rule
    val rule = createComposeRule()

    private val composedItems = mutableSetOf<Int>()

    @Test
    fun moveFocus() {
        // Arrange.
        val (rowSize, itemSize) = with(rule.density) { Pair(50.toDp(), 10.toDp()) }
        lateinit var focusManager: FocusManager
        rule.setContent {
            focusManager = LocalFocusManager.current
            LazyRow(Modifier.size(rowSize)) {
                items(100) { index ->
                    Box(
                        Modifier
                            .size(itemSize)
                            .testTag("$index")
                            .focusable()
                    )
                    SideEffect { composedItems.add(index) }
                }
            }
        }
        rule.onNodeWithTag("4").requestFocus()
        rule.runOnIdle { composedItems.clear() }

        // Act.
        rule.runOnIdle { focusManager.moveFocus(FocusDirection.Right) }

        // Assert
        rule.runOnIdle { assertThat(composedItems).containsExactly(5, 6) }
    }

    @Test
    fun moveFocus_nestedFocusable() {
        // Arrange.
        val (rowSize, itemSize) = with(rule.density) { Pair(50.toDp(), 10.toDp()) }
        lateinit var focusManager: FocusManager
        rule.setContent {
            focusManager = LocalFocusManager.current
            LazyRow(Modifier.size(rowSize)) {
                items(100) { index ->
                    Box(Modifier.size(itemSize).focusable()) {
                        Box(Modifier.size(itemSize).focusable().testTag("$index"))
                    }
                    SideEffect { composedItems.add(index) }
                }
            }
        }
        rule.onNodeWithTag("4").requestFocus()
        rule.runOnIdle { composedItems.clear() }

        // Act.
        rule.runOnIdle { focusManager.moveFocus(FocusDirection.Right) }

        // Assert
        rule.runOnIdle { assertThat(composedItems).containsExactly(5, 6) }
    }

    @Test
    fun moveFocus_deeplyNestedFocusable() {
        // Arrange.
        val (rowSize, itemSize) = with(rule.density) { Pair(50.toDp(), 10.toDp()) }
        lateinit var focusManager: FocusManager
        rule.setContent {
            focusManager = LocalFocusManager.current
            LazyRow(Modifier.size(rowSize)) {
                items(100) { index ->
                    Box(Modifier.size(itemSize).focusable()) {
                        Box(Modifier.size(itemSize).focusable()) {
                            Box(Modifier.size(itemSize).focusable().testTag("$index"))
                        }
                    }
                    SideEffect { composedItems.add(index) }
                }
            }
        }
        rule.onNodeWithTag("4").requestFocus()
        rule.runOnIdle { composedItems.clear() }

        // Act.
        rule.runOnIdle { focusManager.moveFocus(FocusDirection.Right) }

        // Assert
        rule.runOnIdle { assertThat(composedItems).containsExactly(5, 6) }
    }
}