#293 Create class for handling message file initialization

- Work in progress; more logic can be extracted

src/main/java/fr/xephi/authme/message/MessageFileCopier.java

@@ -0,0 +1,63 @@
+package fr.xephi.authme.message;
+
+import fr.xephi.authme.initialization.DataFolder;
+import fr.xephi.authme.settings.Settings;
+import fr.xephi.authme.settings.properties.PluginSettings;
+import fr.xephi.authme.util.FileUtils;
+
+import javax.inject.Inject;
+import java.io.File;
+import java.util.function.Function;
+
+public class MessageFileCopier {
+
+    private static final String DEFAULT_LANGUAGE = "en";
+
+    private final File dataFolder;
+    private final Settings settings;
+
+    @Inject
+    MessageFileCopier(@DataFolder File dataFolder, Settings settings) {
+        this.dataFolder = dataFolder;
+        this.settings = settings;
+    }
+
+    public MessageFileData initializeData(Function<String, String> pathBuilder) {
+        String language = settings.getProperty(PluginSettings.MESSAGES_LANGUAGE);
+        return new MessageFileData(
+            initializeFile(language, pathBuilder),
+            pathBuilder.apply(DEFAULT_LANGUAGE));
+    }
+
+    private File initializeFile(String language, Function<String, String> pathBuilder) {
+        String filePath = pathBuilder.apply(language);
+        File file = new File(dataFolder, filePath);
+        if (FileUtils.copyFileFromResource(file, filePath)) {
+            return file;
+        }
+
+        String defaultFilePath = pathBuilder.apply(DEFAULT_LANGUAGE);
+        if (FileUtils.copyFileFromResource(file, defaultFilePath)) {
+            return file;
+        }
+        return null;
+    }
+
+    public static final class MessageFileData {
+        private final File file;
+        private final String defaultFile;
+
+        MessageFileData(File file, String defaultFile) {
+            this.file = file;
+            this.defaultFile = defaultFile;
+        }
+
+        public File getFile() {
+            return file;
+        }
+
+        public String getDefaultFile() {
+            return defaultFile;
+        }
+    }
+}

src/main/java/fr/xephi/authme/message/Messages.java

@@ -1,8 +1,8 @@
 package fr.xephi.authme.message;
 
 import fr.xephi.authme.ConsoleLogger;
-import fr.xephi.authme.initialization.SettingsDependent;
-import fr.xephi.authme.settings.Settings;
+import fr.xephi.authme.initialization.Reloadable;
+import fr.xephi.authme.message.MessageFileCopier.MessageFileData;
 import org.bukkit.ChatColor;
 import org.bukkit.command.CommandSender;
 import org.bukkit.configuration.file.FileConfiguration;
@@ -16,25 +16,24 @@ import java.io.InputStreamReader;
 /**
  * Class for retrieving and sending translatable messages to players.
  */
-public class Messages implements SettingsDependent {
+public class Messages implements Reloadable {
 
     // Custom Authme tag replaced to new line
     private static final String NEWLINE_TAG = "%nl%";
 
+    private final MessageFileCopier fileCopier;
     private FileConfiguration configuration;
     private String fileName;
-    private final String defaultFile;
+    private String defaultFile;
     private FileConfiguration defaultConfiguration;
 
-    /**
+    /*
      * Constructor.
-     *
-     * @param settings The settings
      */
     @Inject
-    Messages(Settings settings) {
-        reload(settings);
-        this.defaultFile = settings.getDefaultMessagesFile();
+    Messages(MessageFileCopier fileCopier) {
+        this.fileCopier = fileCopier;
+        reload();
     }
 
     /**
@@ -122,10 +121,12 @@ public class Messages implements SettingsDependent {
     }
 
     @Override
-    public void reload(Settings settings) {
-        File messageFile = settings.getMessagesFile();
+    public void reload() {
+        MessageFileData messageFileData = fileCopier.initializeData(lang -> "messages/messages_" + lang + ".yml");
+        File messageFile = messageFileData.getFile();
         this.configuration = YamlConfiguration.loadConfiguration(messageFile);
         this.fileName = messageFile.getName();
+        this.defaultFile = messageFileData.getDefaultFile();
     }
 
     private String getDefault(String code) {