/*
 * 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.database.ContentObserver
import android.provider.Settings
import android.util.Log
import kotlinx.coroutines.CoroutineDispatcher
import kotlinx.coroutines.channels.awaitClose
import kotlinx.coroutines.flow.Flow
import kotlinx.coroutines.flow.callbackFlow
import kotlinx.coroutines.flow.flowOn

/** Interface that indicates if press to auth is on or off. */
interface PressToAuthInteractor {
  /** Indicates true if the PressToAuth feature is enabled, false otherwise. */
  val isEnabled: Flow<Boolean>
}

/** Indicates whether or not the press to auth feature is enabled. */
class PressToAuthInteractorImpl(
  private val context: Context,
  private val backgroundDispatcher: CoroutineDispatcher,
) : PressToAuthInteractor {

  /** A flow that contains the status of the press to auth feature. */
  override val isEnabled: Flow<Boolean> =
    callbackFlow {
        val callback =
          object : ContentObserver(null) {
            override fun onChange(selfChange: Boolean) {
              Log.d(TAG, "SFPS_PERFORMANT_AUTH_ENABLED#onchange")
              trySend(getPressToAuth())
            }
          }

        context.contentResolver.registerContentObserver(
          Settings.Secure.getUriFor(Settings.Secure.SFPS_PERFORMANT_AUTH_ENABLED),
          false,
          callback,
          context.userId,
        )
        trySend(getPressToAuth())
        awaitClose { context.contentResolver.unregisterContentObserver(callback) }
      }
      .flowOn(backgroundDispatcher)

  /** Returns true if press to auth is enabled */
  private fun getPressToAuth(): Boolean {
    var toReturn: Int =
      Settings.Secure.getIntForUser(
        context.contentResolver,
        Settings.Secure.SFPS_PERFORMANT_AUTH_ENABLED,
        -1,
        context.userId,
      )
    if (toReturn == -1) {
      toReturn =
        if (
          context.resources.getBoolean(com.android.internal.R.bool.config_performantAuthDefault)
        ) {
          1
        } else {
          0
        }
      Settings.Secure.putIntForUser(
        context.contentResolver,
        Settings.Secure.SFPS_PERFORMANT_AUTH_ENABLED,
        toReturn,
        context.userId,
      )
    }
    return toReturn == 1
  }

  companion object {
    const val TAG = "PressToAuthInteractor"
  }
}