/*
 * 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.systemui.statusbar.policy

import android.content.res.Configuration
import com.android.systemui.common.coroutine.ConflatedCallbackFlow.conflatedCallbackFlow
import kotlinx.coroutines.channels.awaitClose
import kotlinx.coroutines.flow.Flow

/**
 * A [Flow] that emits whenever screen density or font scale has changed.
 *
 * @see ConfigurationController.ConfigurationListener.onDensityOrFontScaleChanged
 */
val ConfigurationController.onDensityOrFontScaleChanged: Flow<Unit>
    get() = conflatedCallbackFlow {
        val listener =
            object : ConfigurationController.ConfigurationListener {
                override fun onDensityOrFontScaleChanged() {
                    trySend(Unit)
                }
            }
        addCallback(listener)
        awaitClose { removeCallback(listener) }
    }

/**
 * A [Flow] that emits whenever the theme has changed.
 *
 * @see ConfigurationController.ConfigurationListener.onThemeChanged
 */
val ConfigurationController.onThemeChanged: Flow<Unit>
    get() = conflatedCallbackFlow {
        val listener =
            object : ConfigurationController.ConfigurationListener {
                override fun onThemeChanged() {
                    trySend(Unit)
                }
            }
        addCallback(listener)
        awaitClose { removeCallback(listener) }
    }

/**
 * A [Flow] that emits whenever the configuration has changed.
 *
 * @see ConfigurationController.ConfigurationListener.onConfigChanged
 */
val ConfigurationController.onConfigChanged: Flow<Configuration>
    get() = conflatedCallbackFlow {
        val listener =
            object : ConfigurationController.ConfigurationListener {
                override fun onConfigChanged(newConfig: Configuration) {
                    trySend(newConfig)
                }
            }
        addCallback(listener)
        awaitClose { removeCallback(listener) }
    }