app/src/main/java/fr/sanchezm/attestationsCovid19/data/db/dao/AttestationDao.kt

@@ -11,8 +11,8 @@ import java.io.File
 
 class AttestationDao(private val savePath: String, private val filesPath: String) {
 
-    private var _attestations = MutableLiveData<ArrayList<Attestation>>()
-    private var fileName = "attestation.db"
+    private val _attestations = MutableLiveData<ArrayList<Attestation>>()
+    private val fileName = "attestation.db"
     private val type = object : TypeToken<ArrayList<Attestation>>() {}.type
 
     @Suppress("UNCHECKED_CAST")

app/src/main/java/fr/sanchezm/attestationsCovid19/data/db/dao/ConfigDao.kt

@@ -0,0 +1,41 @@
+package fr.sanchezm.attestationsCovid19.data.db.dao
+
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.MutableLiveData
+import com.google.gson.Gson
+import fr.sanchezm.attestationsCovid19.BuildConfig
+import fr.sanchezm.attestationsCovid19.data.db.entity.Config
+import java.io.File
+
+class ConfigDao(private val savePath: String) {
+
+    private val _config = MutableLiveData<Config>()
+    private val fileName = "config.db"
+
+    fun getConfig(): LiveData<Config> =
+        _config
+
+    fun updateConfig(config: Config) {
+        _config.value = config
+        save()
+    }
+
+    init {
+        load()
+    }
+
+    private fun load() {
+        val file = File("$savePath/$fileName")
+
+        if (file.exists()) {
+            _config.value = Gson().fromJson(file.readText(Charsets.UTF_8), Config::class.java)
+        } else {
+            _config.value = Config(BuildConfig.DB_VERSION)
+        }
+    }
+
+    private fun save() {
+        File("$savePath/$fileName").writeText(Gson().toJson(_config.value))
+    }
+
+}

app/src/main/java/fr/sanchezm/attestationsCovid19/data/db/dao/ProfileDao.kt

@@ -8,8 +8,8 @@ import java.io.File
 
 class ProfileDao(private val path: String) {
 
-    private var _profile = MutableLiveData<Profile>()
-    private var fileName = "profile.db"
+    private val _profile = MutableLiveData<Profile>()
+    private val fileName = "profile.db"
 
     fun getProfile(): LiveData<Profile> =
         _profile

app/src/main/java/fr/sanchezm/attestationsCovid19/data/db/entity/Config.kt

@@ -0,0 +1,5 @@
+package fr.sanchezm.attestationsCovid19.data.db.entity
+
+data class Config(
+    val dbVersion: Int
+)

app/src/main/java/fr/sanchezm/attestationsCovid19/data/repository/ConfigRepository.kt

@@ -0,0 +1,21 @@
+package fr.sanchezm.attestationsCovid19.data.repository
+
+import fr.sanchezm.attestationsCovid19.data.db.dao.ConfigDao
+import fr.sanchezm.attestationsCovid19.data.db.entity.Config
+
+class ConfigRepository private constructor(private val configDao: ConfigDao) {
+
+    fun getConfig() = configDao.getConfig()
+
+    fun updateConfig(config: Config) = configDao.updateConfig(config)
+
+    companion object {
+        @Volatile
+        private var instance: ConfigRepository? = null
+
+        fun getInstance(configDao: ConfigDao) =
+            instance ?: synchronized(this) {
+                instance ?: ConfigRepository(configDao).also { instance = it }
+            }
+    }
+}