/*
 * 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.settingslib.spaprivileged.settingsprovider

import android.content.ContentResolver
import android.content.Context
import android.provider.Settings
import com.android.settingslib.spaprivileged.database.contentChangeFlow
import kotlin.properties.ReadWriteProperty
import kotlin.reflect.KProperty
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.flow.Flow
import kotlinx.coroutines.flow.conflate
import kotlinx.coroutines.flow.distinctUntilChanged
import kotlinx.coroutines.flow.flowOn
import kotlinx.coroutines.flow.map

fun Context.settingsSystemInteger(
    name: String,
    defaultValue: Int
): ReadWriteProperty<Any?, Int> = SettingsSystemIntegerDelegate(this, name, defaultValue)

fun Context.settingsSystemIntegerFlow(name: String, defaultValue: Int): Flow<Int> {
    val value by settingsSystemInteger(name, defaultValue)
    return contentChangeFlow(Settings.System.getUriFor(name))
        .map { value }
        .distinctUntilChanged()
        .conflate()
        .flowOn(Dispatchers.IO)
}

private class SettingsSystemIntegerDelegate(
    context: Context,
    private val name: String,
    private val defaultValue: Int,
) : ReadWriteProperty<Any?, Int> {

    private val contentResolver: ContentResolver = context.contentResolver

    override fun getValue(thisRef: Any?, property: KProperty<*>): Int =
        Settings.System.getInt(contentResolver, name, defaultValue)

    override fun setValue(thisRef: Any?, property: KProperty<*>, value: Int) {
        Settings.System.putInt(contentResolver, name, value)
    }
}