/*
 * 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.systemui.keyguard.ui.viewmodel

import com.android.systemui.dagger.SysUISingleton
import com.android.systemui.deviceentry.domain.interactor.DeviceEntryUdfpsInteractor
import com.android.systemui.keyguard.dagger.GlanceableHubBlurComponent
import com.android.systemui.keyguard.domain.interactor.FromGlanceableHubTransitionInteractor
import com.android.systemui.keyguard.shared.model.Edge
import com.android.systemui.keyguard.shared.model.KeyguardState
import com.android.systemui.keyguard.shared.model.KeyguardState.AOD
import com.android.systemui.keyguard.ui.KeyguardTransitionAnimationFlow
import com.android.systemui.keyguard.ui.transitions.DeviceEntryIconTransition
import com.android.systemui.keyguard.ui.transitions.GlanceableHubTransition
import com.android.systemui.scene.shared.model.Scenes
import javax.inject.Inject
import kotlin.time.Duration.Companion.milliseconds
import kotlinx.coroutines.ExperimentalCoroutinesApi
import kotlinx.coroutines.flow.Flow
import kotlinx.coroutines.flow.emptyFlow
import kotlinx.coroutines.flow.flatMapLatest

@OptIn(ExperimentalCoroutinesApi::class)
@SysUISingleton
class GlanceableHubToAodTransitionViewModel
@Inject
constructor(
    deviceEntryUdfpsInteractor: DeviceEntryUdfpsInteractor,
    animationFlow: KeyguardTransitionAnimationFlow,
    blurComponentFactory: GlanceableHubBlurComponent.Factory,
) : DeviceEntryIconTransition, GlanceableHubTransition {

    private val transitionAnimation =
        animationFlow
            .setup(
                duration = FromGlanceableHubTransitionInteractor.TO_AOD_DURATION,
                edge = Edge.create(from = Scenes.Communal, to = AOD),
            )
            .setupWithoutSceneContainer(edge = Edge.create(KeyguardState.GLANCEABLE_HUB, AOD))

    val deviceEntryBackgroundViewAlpha: Flow<Float> =
        transitionAnimation.immediatelyTransitionTo(0f)

    /** Lockscreen views alpha */
    val lockscreenAlpha: Flow<Float> =
        transitionAnimation.sharedFlow(
            startTime = 233.milliseconds,
            duration = 250.milliseconds,
            onStep = { it },
            onCancel = { 0f },
            onFinish = { 1f },
        )

    override val zoomOut: Flow<Float> =
        transitionAnimation.sharedFlow(
            onStep = { 1f - it },
            // reset zoom out on wallpaper and keyguard view
            onFinish = { 0f },
            onCancel = { 1f },
            name = "GLANCEABLE_HUB->AOD: zoomOut",
        )

    override val deviceEntryParentViewAlpha: Flow<Float> =
        deviceEntryUdfpsInteractor.isUdfpsEnrolledAndEnabled.flatMapLatest { udfpsEnrolledAndEnabled
            ->
            if (udfpsEnrolledAndEnabled) {
                transitionAnimation.immediatelyTransitionTo(1f)
            } else {
                emptyFlow()
            }
        }

    override val windowBlurRadius: Flow<Float> =
        blurComponentFactory.create(transitionAnimation).getBlurProvider().exitBlurRadius
}