feat: Refactor MeshService into smaller, single-responsibility components (#4108)

Signed-off-by: James Rich <2199651+jamesarich@users.noreply.github.com>

app/src/main/java/com/geeksville/mesh/service/MeshConfigHandler.kt

@@ -0,0 +1,88 @@
+/*
+ * Copyright (c) 2025 Meshtastic LLC
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.geeksville.mesh.service
+
+import com.geeksville.mesh.concurrent.handledLaunch
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.SupervisorJob
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.launchIn
+import kotlinx.coroutines.flow.onEach
+import org.meshtastic.core.data.repository.RadioConfigRepository
+import org.meshtastic.core.service.ServiceRepository
+import org.meshtastic.proto.ChannelProtos
+import org.meshtastic.proto.ConfigProtos
+import org.meshtastic.proto.LocalOnlyProtos.LocalConfig
+import org.meshtastic.proto.LocalOnlyProtos.LocalModuleConfig
+import org.meshtastic.proto.ModuleConfigProtos
+import javax.inject.Inject
+import javax.inject.Singleton
+
+@Singleton
+class MeshConfigHandler
+@Inject
+constructor(
+    private val radioConfigRepository: RadioConfigRepository,
+    private val serviceRepository: ServiceRepository,
+    private val nodeManager: MeshNodeManager,
+) {
+    private var scope: CoroutineScope = CoroutineScope(Dispatchers.IO + SupervisorJob())
+
+    private val _localConfig = MutableStateFlow(LocalConfig.getDefaultInstance())
+    val localConfig = _localConfig.asStateFlow()
+
+    private val _moduleConfig = MutableStateFlow(LocalModuleConfig.getDefaultInstance())
+    val moduleConfig = _moduleConfig.asStateFlow()
+
+    private val configTotal = ConfigProtos.Config.getDescriptor().fields.size
+    private val moduleTotal = ModuleConfigProtos.ModuleConfig.getDescriptor().fields.size
+
+    fun start(scope: CoroutineScope) {
+        this.scope = scope
+        radioConfigRepository.localConfigFlow.onEach { _localConfig.value = it }.launchIn(scope)
+
+        radioConfigRepository.moduleConfigFlow.onEach { _moduleConfig.value = it }.launchIn(scope)
+    }
+
+    fun handleDeviceConfig(config: ConfigProtos.Config) {
+        scope.handledLaunch { radioConfigRepository.setLocalConfig(config) }
+        val configCount = _localConfig.value.allFields.size
+        serviceRepository.setStatusMessage("Device config ($configCount / $configTotal)")
+    }
+
+    fun handleModuleConfig(config: ModuleConfigProtos.ModuleConfig) {
+        scope.handledLaunch { radioConfigRepository.setLocalModuleConfig(config) }
+        val moduleCount = _moduleConfig.value.allFields.size
+        serviceRepository.setStatusMessage("Module config ($moduleCount / $moduleTotal)")
+    }
+
+    fun handleChannel(ch: ChannelProtos.Channel) {
+        // We always want to save channel settings we receive from the radio
+        scope.handledLaunch { radioConfigRepository.updateChannelSettings(ch) }
+
+        // Update status message if we have node info, otherwise use a generic one
+        val mi = nodeManager.getMyNodeInfo()
+        if (mi != null) {
+            serviceRepository.setStatusMessage("Channels (${ch.index + 1} / ${mi.maxChannels})")
+        } else {
+            serviceRepository.setStatusMessage("Channels (${ch.index + 1})")
+        }
+    }
+}