Refactor AutomaticDataSwitchingPreference

Split into AutomaticDataSwitchingPreference.kt, and use
isMobileDataPolicyEnabledFlow.

Bug: 329061940
Test: manual - Set Automatic data switching
Test: unit test
Change-Id: I878ed70328307c0a5dba6dfb461ff5a85efbcf88

src/com/android/settings/spa/network/AutomaticDataSwitchingPreference.kt

@@ -0,0 +1,58 @@
+/*
+ * 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.spa.network
+
+import android.telephony.TelephonyManager
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.ui.res.stringResource
+import com.android.settings.R
+import com.android.settings.network.telephony.TelephonyRepository
+import com.android.settingslib.spa.widget.preference.SwitchPreference
+import com.android.settingslib.spa.widget.preference.SwitchPreferenceModel
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
+
+@Composable
+fun AutomaticDataSwitchingPreference(
+    isAutoDataEnabled: () -> Boolean?,
+    setAutoDataEnabled: (newEnabled: Boolean) -> Unit,
+) {
+    val autoDataSummary = stringResource(id = R.string.primary_sim_automatic_data_msg)
+    val coroutineScope = rememberCoroutineScope()
+    SwitchPreference(
+        object : SwitchPreferenceModel {
+            override val title = stringResource(id = R.string.primary_sim_automatic_data_title)
+            override val summary = { autoDataSummary }
+            override val checked = { isAutoDataEnabled() }
+            override val onCheckedChange: (Boolean) -> Unit = { newEnabled ->
+                coroutineScope.launch(Dispatchers.Default) {
+                    setAutoDataEnabled(newEnabled)
+                }
+            }
+        }
+    )
+}
+
+fun TelephonyRepository.setAutomaticData(subId: Int, newEnabled: Boolean) {
+    setMobileDataPolicyEnabled(
+        subId = subId,
+        policy = TelephonyManager.MOBILE_DATA_POLICY_AUTO_DATA_SWITCH,
+        enabled = newEnabled,
+    )
+    //TODO: setup backup calling
+}