fix: add check if kernel supports WG (#993)

app/src/main/java/com/zaneschepke/wireguardautotunnel/viewmodel/SharedAppViewModel.kt

@@ -3,7 +3,7 @@ package com.zaneschepke.wireguardautotunnel.viewmodel
 import android.net.Uri
 import androidx.core.net.toUri
 import androidx.lifecycle.ViewModel
-import com.zaneschepke.wireguardautotunnel.R
+import com.wireguard.android.backend.WgQuickBackend
 import com.zaneschepke.wireguardautotunnel.core.service.ServiceManager
 import com.zaneschepke.wireguardautotunnel.core.tunnel.TunnelManager
 import com.zaneschepke.wireguardautotunnel.data.model.AppMode
@@ -34,6 +34,7 @@ import kotlinx.coroutines.flow.map
 import org.amnezia.awg.config.BadConfigException
 import org.orbitmvi.orbit.ContainerHost
 import org.orbitmvi.orbit.viewmodel.container
+import timber.log.Timber
 import xyz.teamgravity.pin_lock_compose.PinManager
 
 @HiltViewModel
@@ -164,6 +165,19 @@ constructor(
                     else StringValue.StringResource(R.string.root_accepted)
                 postSideEffect(GlobalSideEffect.Snackbar(message))
                 if (!accepted) return@intent
+                if (WgQuickBackend.hasKernelSupport())
+                    Timber.i("Device supports kernel backend. WireGuard module is built in, switching to kernel backend.")
+                else {
+                    Timber.e("Device does not support kernel backend!")
+                    intent {
+                        postSideEffect(
+                            GlobalSideEffect.Snackbar(
+                                StringValue.StringResource(R.string.kernel_wireguard_unsupported)
+                            )
+                        )
+                    }
+                    return@intent
+                }
             }
         }
         settingsRepository.upsert(state.settings.copy(appMode = appMode))