/*
 * 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.systemui.keyguard.ui.viewmodel

import com.android.systemui.Flags
import com.android.systemui.dagger.SysUISingleton
import com.android.systemui.keyguard.domain.interactor.FromOccludedTransitionInteractor
import com.android.systemui.keyguard.shared.model.Edge
import com.android.systemui.keyguard.shared.model.KeyguardState.OCCLUDED
import com.android.systemui.keyguard.shared.model.KeyguardState.PRIMARY_BOUNCER
import com.android.systemui.keyguard.ui.KeyguardTransitionAnimationFlow
import com.android.systemui.keyguard.ui.transitions.BlurConfig
import com.android.systemui.keyguard.ui.transitions.PrimaryBouncerTransition
import javax.inject.Inject
import kotlin.time.Duration.Companion.milliseconds
import kotlinx.coroutines.flow.Flow

@SysUISingleton
class OccludedToPrimaryBouncerTransitionViewModel
@Inject
constructor(blurConfig: BlurConfig, animationFlow: KeyguardTransitionAnimationFlow) :
    PrimaryBouncerTransition {
    private val transitionAnimation =
        animationFlow
            .setup(
                duration = FromOccludedTransitionInteractor.TO_PRIMARY_BOUNCER_DURATION,
                edge = Edge.INVALID,
            )
            .setupWithoutSceneContainer(edge = Edge.create(OCCLUDED, PRIMARY_BOUNCER))

    /**
     * Reasserts that lockscreen content should not be visible. It is possible the keyguard alpha is
     * set to 1f if coming from an expanded shade that collapsed to launch an occluding activity.
     */
    val lockscreenAlpha: Flow<Float> = transitionAnimation.immediatelyTransitionTo(0f)

    override val windowBlurRadius: Flow<Float> =
        transitionAnimation.sharedFlowWithShade(
            duration = 1.milliseconds,
            onStep = { _, isShadeExpanded ->
                if (isShadeExpanded) {
                    if (Flags.notificationShadeBlur()) {
                        blurConfig.maxBlurRadiusPx
                    } else {
                        blurConfig.minBlurRadiusPx
                    }
                } else {
                    blurConfig.maxBlurRadiusPx
                }
            },
        )

    override val notificationBlurRadius: Flow<Float> =
        transitionAnimation.sharedFlowWithShade(
            duration = 1.milliseconds,
            onStep = { _, isShadeExpanded ->
                if (isShadeExpanded) {
                    blurConfig.maxBlurRadiusPx
                } else {
                    null
                }
            },
        )
}