/*
 * 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.wallpaper.picker.preview.ui.viewmodel

import android.view.View
import androidx.core.view.isVisible
import androidx.lifecycle.Lifecycle
import androidx.lifecycle.LifecycleOwner
import androidx.lifecycle.lifecycleScope
import androidx.lifecycle.repeatOnLifecycle
import com.android.wallpaper.picker.customization.ui.util.ViewAlphaAnimator.animateToAlpha
import kotlinx.coroutines.launch

object SmallPreviewAlphaAnimationBinder {
    fun bind(
        lockPreviewShades: List<View>?,
        homePreviewShades: List<View>?,
        viewModel: WallpaperPreviewViewModel,
        lifecycleOwner: LifecycleOwner,
    ) {
        lifecycleOwner.lifecycleScope.launch {
            lifecycleOwner.repeatOnLifecycle(Lifecycle.State.STARTED) {
                launch {
                    viewModel.smallLockPreviewAlpha.collect { previewAlpha ->
                        if (previewAlpha == null) {
                            lockPreviewShades?.forEach { it.isVisible = false }
                        } else {
                            lockPreviewShades?.forEach { it.isVisible = true }
                            val shadeAlpha = 1 - previewAlpha.alpha
                            if (previewAlpha.shouldAnimate) {
                                lockPreviewShades?.forEach { it.animateToAlpha(shadeAlpha) }
                            } else {
                                lockPreviewShades?.forEach { it.alpha = shadeAlpha }
                            }
                        }
                    }
                }

                launch {
                    viewModel.smallHomePreviewAlpha.collect { previewAlpha ->
                        if (previewAlpha == null) {
                            homePreviewShades?.forEach { it.isVisible = false }
                        } else {
                            homePreviewShades?.forEach { it.isVisible = true }
                            val shadeAlpha = 1 - previewAlpha.alpha
                            if (previewAlpha.shouldAnimate) {
                                homePreviewShades?.forEach { it.animateToAlpha(shadeAlpha) }
                            } else {
                                homePreviewShades?.forEach { it.alpha = shadeAlpha }
                            }
                        }
                    }
                }
            }
        }
    }
}