/*
 * Copyright (C) 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 com.android.systemui.keyguard.ui.viewmodel

import androidx.test.ext.junit.runners.AndroidJUnit4
import androidx.test.filters.SmallTest
import com.android.systemui.SysuiTestCase
import com.android.systemui.coroutines.collectLastValue
import com.android.systemui.coroutines.collectValues
import com.android.systemui.flags.DisableSceneContainer
import com.android.systemui.keyguard.data.repository.fakeKeyguardTransitionRepository
import com.android.systemui.keyguard.shared.model.KeyguardState
import com.android.systemui.keyguard.shared.model.TransitionState
import com.android.systemui.keyguard.shared.model.TransitionStep
import com.android.systemui.kosmos.testScope
import com.android.systemui.statusbar.sysuiStatusBarStateController
import com.android.systemui.testKosmos
import com.google.common.truth.Truth.assertThat
import kotlinx.coroutines.test.runTest
import org.junit.Before
import org.junit.Test
import org.junit.runner.RunWith

@SmallTest
@RunWith(AndroidJUnit4::class)
@DisableSceneContainer
class LockscreenToGoneTransitionViewModelTest : SysuiTestCase() {
    private val kosmos = testKosmos()
    private val testScope = kosmos.testScope
    private val repository = kosmos.fakeKeyguardTransitionRepository
    private val sysuiStatusBarStateController = kosmos.sysuiStatusBarStateController
    private lateinit var underTest: LockscreenToGoneTransitionViewModel

    @Before
    fun setup() {
        underTest = kosmos.lockscreenToGoneTransitionViewModel
    }

    @Test
    fun deviceEntryParentViewHides() =
        testScope.runTest {
            val deviceEntryParentViewAlpha by collectLastValue(underTest.deviceEntryParentViewAlpha)
            val tolerance = 0.05f

            repository.sendTransitionStep(step(0f, TransitionState.STARTED))
            assertThat(deviceEntryParentViewAlpha).isEqualTo(1f)

            repository.sendTransitionStep(step(0.1f))
            assertThat(deviceEntryParentViewAlpha).isWithin(tolerance).of(0.9f)

            repository.sendTransitionStep(step(0.3f))
            assertThat(deviceEntryParentViewAlpha).isWithin(tolerance).of(0.7f)

            repository.sendTransitionStep(step(0.4f))
            assertThat(deviceEntryParentViewAlpha).isWithin(tolerance).of(0.6f)

            repository.sendTransitionStep(step(0.5f))
            assertThat(deviceEntryParentViewAlpha).isWithin(tolerance).of(0.5f)

            repository.sendTransitionStep(step(0.6f))
            assertThat(deviceEntryParentViewAlpha).isWithin(tolerance).of(0.4f)

            repository.sendTransitionStep(step(0.8f))
            assertThat(deviceEntryParentViewAlpha).isWithin(tolerance).of(0.2f)

            repository.sendTransitionStep(step(1f))
            assertThat(deviceEntryParentViewAlpha).isEqualTo(0f)
        }

    @Test
    fun lockscreenAlphaStartsFromViewStateAccessorAlpha() =
        testScope.runTest {
            val viewState = ViewStateAccessor(alpha = { 0.5f })
            val alpha by collectLastValue(underTest.lockscreenAlpha(viewState))

            repository.sendTransitionStep(step(0f, TransitionState.STARTED))

            repository.sendTransitionStep(step(0f))
            assertThat(alpha).isEqualTo(0.5f)

            // Before the halfway point, it will have reached zero
            repository.sendTransitionStep(step(.5f))
            assertThat(alpha).isEqualTo(0f)
        }

    @Test
    fun lockscreenAlphaWithNoViewStateAccessorValue() =
        testScope.runTest {
            val alpha by collectLastValue(underTest.lockscreenAlpha(ViewStateAccessor()))

            repository.sendTransitionStep(step(0f, TransitionState.STARTED))

            repository.sendTransitionStep(step(0f))
            assertThat(alpha).isEqualTo(0f)

            repository.sendTransitionStep(step(0.25f))
            assertThat(alpha).isEqualTo(0f)

            repository.sendTransitionStep(step(0.5f))
            assertThat(alpha).isEqualTo(0f)
        }

    @Test
    fun notificationAlpha_leaveShadeOpen() =
        testScope.runTest {
            val values by collectValues(underTest.notificationAlpha(ViewStateAccessor()))

            sysuiStatusBarStateController.setLeaveOpenOnKeyguardHide(true)

            repository.sendTransitionStep(step(0f, TransitionState.STARTED))
            repository.sendTransitionStep(step(1f))

            assertThat(values.size).isEqualTo(2)
            values.forEach { assertThat(it).isEqualTo(1f) }
        }

    private fun step(
        value: Float,
        state: TransitionState = TransitionState.RUNNING,
    ): TransitionStep {
        return TransitionStep(
            from = KeyguardState.LOCKSCREEN,
            to = KeyguardState.GONE,
            value = value,
            transitionState = state,
            ownerName = "LockscreenToGoneTransitionViewModelTest",
        )
    }
}