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/*
* 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.customization.model.grid.domain.interactor
import com.android.customization.model.CustomizationManager
import com.android.customization.model.grid.GridOption
import com.android.customization.model.grid.data.repository.GridRepository
import com.android.customization.model.grid.shared.model.GridOptionItemModel
import com.android.customization.model.grid.shared.model.GridOptionItemsModel
import javax.inject.Provider
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.flow.Flow
import kotlinx.coroutines.flow.SharingStarted
import kotlinx.coroutines.flow.emptyFlow
import kotlinx.coroutines.flow.flatMapLatest
import kotlinx.coroutines.flow.flow
import kotlinx.coroutines.flow.map
import kotlinx.coroutines.flow.onStart
import kotlinx.coroutines.flow.shareIn
class GridInteractor(
private val applicationScope: CoroutineScope,
private val repository: GridRepository,
private val snapshotRestorer: Provider<GridSnapshotRestorer>,
) {
val options: Flow<GridOptionItemsModel> =
flow { emit(repository.isAvailable()) }
.flatMapLatest { isAvailable ->
if (isAvailable) {
// this upstream flow tells us each time the options are changed.
repository
.getOptionChanges()
// when we start, we pretend the options _just_ changed. This way, we load
// something as soon as possible into the flow so it's ready by the time the
// first observer starts to observe.
.onStart { emit(Unit) }
// each time the options changed, we load them.
.map { reload() }
// we place the loaded options in a SharedFlow so downstream observers all
// share the same flow and don't trigger a new one each time they want to
// start observing.
.shareIn(
scope = applicationScope,
started = SharingStarted.WhileSubscribed(),
replay = 1,
)
} else {
emptyFlow()
}
}
suspend fun setSelectedOption(model: GridOptionItemModel) {
model.onSelected.invoke()
}
suspend fun getSelectedOption(): GridOptionItemModel? {
return (repository.getOptions() as? GridOptionItemsModel.Loaded)?.options?.firstOrNull {
optionItem ->
optionItem.isSelected.value
}
}
fun getSelectOptionNonSuspend(): GridOption? = repository.getSelectedOption()
fun clearSelectedOption() = repository.clearSelectedOption()
fun isSelectedOptionApplied() = repository.isSelectedOptionApplied()
fun applySelectedOption(callback: CustomizationManager.Callback) {
repository.applySelectedOption(callback)
}
private suspend fun reload(): GridOptionItemsModel {
val model = repository.getOptions()
return if (model is GridOptionItemsModel.Loaded) {
GridOptionItemsModel.Loaded(
options =
model.options.map { option ->
GridOptionItemModel(
name = option.name,
cols = option.cols,
rows = option.rows,
isSelected = option.isSelected,
onSelected = {
option.onSelected()
snapshotRestorer.get().store(option)
},
)
}
)
} else {
model
}
}
}
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