/*
 * 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.screencapture.common.ui.viewmodel

import com.android.systemui.screencapture.common.domain.interactor.ScreenCaptureRecentTaskInteractor
import com.android.systemui.screencapture.common.domain.model.ScreenCaptureRecentTask
import javax.inject.Inject
import kotlinx.coroutines.flow.Flow

/**
 * Interface for view models concerned with recent tasks.
 *
 * Example Usage:
 * ```
 * class FooViewModel(vm: RecentTasksViewModelImpl) : RecentTasksViewModel by vm
 * ```
 *
 * And then in compose:
 * ```
 * @Composable
 * fun Foo(viewModel: FooViewModel, modelFactory: RecentTaskViewModel.Factory) {
 *     val recentTasks by viewModel.recentTasks.collectAsState()
 *     LazyRow {
 *         recentTasks?.let {
 *             items(it) { task ->
 *                 val model by rememberViewModel("FooTraceName", task) {
 *                     modelFactory.create(task)
 *                 }
 *                 // ...
 *             }
 *         }
 *     }
 * }
 * ```
 */
interface RecentTasksViewModel {
    /** The current list of recent tasks. */
    val recentTasks: Flow<List<ScreenCaptureRecentTask>?>
}

/** The default implementation of [RecentTasksViewModel]. */
class RecentTasksViewModelImpl @Inject constructor(interactor: ScreenCaptureRecentTaskInteractor) :
    RecentTasksViewModel {

    override val recentTasks: Flow<List<ScreenCaptureRecentTask>?> = interactor.recentTasks
}