InternetPreferenceController V2 (1/n)

Refactor the InternetPreferenceController, migrate to repository and
flow, run data loading on background thread.

Only add Wifi summary for now.

Bug: 339884322
Flag: com.android.settings.flags.internet_preference_controller_v2
Test: manual - on Internet
Test: unit test
Change-Id: Ibd8911bc11b24d4a7e2ef320dea4d38b9c3a864f

src/com/android/settings/wifi/WifiSummaryRepository.kt

@@ -0,0 +1,91 @@
+/*
+ * 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.wifi
+
+import android.content.Context
+import android.content.IntentFilter
+import android.net.ConnectivityManager
+import android.net.NetworkScoreManager
+import android.net.wifi.WifiInfo
+import android.net.wifi.WifiManager
+import com.android.settingslib.R
+import com.android.settingslib.spaprivileged.framework.common.broadcastReceiverFlow
+import com.android.settingslib.wifi.WifiStatusTracker
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.channels.awaitClose
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.callbackFlow
+import kotlinx.coroutines.flow.conflate
+import kotlinx.coroutines.flow.flowOn
+import kotlinx.coroutines.flow.launchIn
+import kotlinx.coroutines.flow.map
+import kotlinx.coroutines.flow.onEach
+
+/**
+ * Repository that listeners to wifi callback and provide wifi summary flow to client.
+ */
+class WifiSummaryRepository(
+    private val context: Context,
+    private val wifiStatusTrackerFactory: (callback: Runnable) -> WifiStatusTracker = { callback ->
+        WifiStatusTracker(
+            context,
+            context.getSystemService(WifiManager::class.java),
+            context.getSystemService(NetworkScoreManager::class.java),
+            context.getSystemService(ConnectivityManager::class.java),
+            callback,
+        )
+    },
+) {
+
+    fun summaryFlow() = wifiStatusTrackerFlow()
+        .map { wifiStatusTracker -> wifiStatusTracker.getSummary() }
+        .conflate()
+        .flowOn(Dispatchers.Default)
+
+    private fun WifiStatusTracker.getSummary(): String {
+        if (!enabled) return context.getString(com.android.settings.R.string.switch_off_text)
+        if (!connected) return context.getString(com.android.settings.R.string.disconnected)
+        val sanitizedSsid = WifiInfo.sanitizeSsid(ssid) ?: ""
+        if (statusLabel.isNullOrEmpty()) return sanitizedSsid
+        return context.getString(
+            R.string.preference_summary_default_combination, sanitizedSsid, statusLabel
+        )
+    }
+
+    private fun wifiStatusTrackerFlow(): Flow<WifiStatusTracker> = callbackFlow {
+        var wifiStatusTracker: WifiStatusTracker? = null
+        wifiStatusTracker = wifiStatusTrackerFactory { wifiStatusTracker?.let(::trySend) }
+
+        context.broadcastReceiverFlow(INTENT_FILTER)
+            .onEach { intent -> wifiStatusTracker.handleBroadcast(intent) }
+            .launchIn(this)
+
+        wifiStatusTracker.setListening(true)
+        wifiStatusTracker.fetchInitialState()
+        trySend(wifiStatusTracker)
+
+        awaitClose { wifiStatusTracker.setListening(false) }
+    }.conflate().flowOn(Dispatchers.Default)
+
+    private companion object {
+        val INTENT_FILTER = IntentFilter().apply {
+            addAction(WifiManager.WIFI_STATE_CHANGED_ACTION)
+            addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION)
+            addAction(WifiManager.RSSI_CHANGED_ACTION)
+        }
+    }
+}