/*
 * 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.settings.network.telephony

import android.content.Context
import android.telephony.ServiceState
import android.telephony.TelephonyCallback
import android.util.Log
import kotlinx.coroutines.flow.Flow

private const val TAG = "ServiceStateFlow"

/** Creates an instance of a cold Flow for [ServiceState] of given [subId]. */
fun Context.serviceStateFlow(subId: Int): Flow<ServiceState> = telephonyCallbackFlow(subId) {
    object : TelephonyCallback(), TelephonyCallback.ServiceStateListener {
        override fun onServiceStateChanged(serviceState: ServiceState) {
            trySend(serviceState)
            Log.d(TAG, "[$subId] serviceState: $serviceState")
        }
    }
}
