/*
 * 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.settings.biometrics.fingerprint2.domain.interactor

import android.content.Context
import android.content.res.Configuration
import com.android.systemui.unfold.compat.ScreenSizeFoldProvider
import com.android.systemui.unfold.updates.FoldProvider
import kotlinx.coroutines.channels.awaitClose
import kotlinx.coroutines.flow.Flow
import kotlinx.coroutines.flow.callbackFlow

interface FoldStateInteractor {
  /** A flow that contains the fold state info */
  val isFolded: Flow<Boolean>

  /**
   * Indicates a configuration change has occurred, and the repo should update the [isFolded] flow.
   */
  fun onConfigurationChange(newConfig: Configuration)
}

/** Interactor which handles fold state */
class FoldStateInteractorImpl(context: Context) : FoldStateInteractor {
  private val screenSizeFoldProvider = ScreenSizeFoldProvider(context)
  override val isFolded: Flow<Boolean> = callbackFlow {
    val foldStateListener = FoldProvider.FoldCallback { isFolded -> trySend(isFolded) }
    screenSizeFoldProvider.registerCallback(foldStateListener, context.mainExecutor)
    awaitClose { screenSizeFoldProvider.unregisterCallback(foldStateListener) }
  }

  /**
   * This function is called by the root activity, indicating an orientation event has occurred.
   * When this happens, the [ScreenSizeFoldProvider] is notified and it will re-compute if the
   * device is folded or not, and notify the [FoldProvider.FoldCallback]
   */
  override fun onConfigurationChange(newConfig: Configuration) {
    screenSizeFoldProvider.onConfigurationChange(newConfig)
  }
}
