#293 Create class for handling message file initialization

- Work in progress; more logic can be extracted

src/main/java/fr/xephi/authme/command/help/HelpMessagesService.java

@@ -4,15 +4,17 @@ import com.google.common.base.CaseFormat;
 import fr.xephi.authme.command.CommandArgumentDescription;
 import fr.xephi.authme.command.CommandDescription;
 import fr.xephi.authme.command.CommandUtils;
-import fr.xephi.authme.initialization.DataFolder;
 import fr.xephi.authme.initialization.Reloadable;
+import fr.xephi.authme.message.MessageFileCopier;
+import fr.xephi.authme.message.MessageFileCopier.MessageFileData;
+import fr.xephi.authme.message.Messages;
 import fr.xephi.authme.permission.DefaultPermission;
-import fr.xephi.authme.util.FileUtils;
 import org.bukkit.configuration.file.FileConfiguration;
 import org.bukkit.configuration.file.YamlConfiguration;
 
 import javax.inject.Inject;
-import java.io.File;
+import java.io.InputStream;
+import java.io.InputStreamReader;
 import java.util.function.Supplier;
 import java.util.stream.Collectors;
 
@@ -26,19 +28,15 @@ public class HelpMessagesService implements Reloadable {
     private static final String DETAILED_DESCRIPTION_SUFFIX = ".detailedDescription";
     private static final String DEFAULT_PERMISSIONS_PATH = "common.defaultPermissions.";
 
-    private final File dataFolder;
-    // FIXME: Make configurable
-    private String file = "messages/help_en.yml";
+    private final MessageFileCopier fileCopier;
     private FileConfiguration fileConfiguration;
+    private String defaultFile;
+    private FileConfiguration defaultConfiguration;
 
     @Inject
-    HelpMessagesService(@DataFolder File dataFolder) {
-        File messagesFile = new File(dataFolder, "messages/help_en.yml");
-        if (!FileUtils.copyFileFromResource(messagesFile, file)) {
-            throw new IllegalStateException("Could not copy help message");
-        }
-        this.dataFolder = dataFolder;
-        fileConfiguration = YamlConfiguration.loadConfiguration(messagesFile);
+    HelpMessagesService(MessageFileCopier fileCopier) {
+        this.fileCopier = fileCopier;
+        reload();
     }
 
     /**
@@ -77,7 +75,7 @@ public class HelpMessagesService implements Reloadable {
     public String getMessage(HelpMessageKey key) {
         String message = fileConfiguration.getString(key.getKey());
         return message == null
-            ? key.getFallback()
+            ? getDefault(key.getKey())
             : message;
     }
 
@@ -89,12 +87,31 @@ public class HelpMessagesService implements Reloadable {
         if (message != null) {
             return message;
         }
-        return defaultPermission.name(); // FIXME: Default message
+        return getDefault(path);
     }
 
     @Override
     public void reload() {
-        fileConfiguration = YamlConfiguration.loadConfiguration(new File(dataFolder, "messages/help_en.yml"));
+        MessageFileData fileData = fileCopier.initializeData(lang -> "messages/help_" + lang + ".yml");
+        this.fileConfiguration = YamlConfiguration.loadConfiguration(fileData.getFile());
+        this.defaultFile = fileData.getDefaultFile();
+    }
+
+    private String getDefault(String code) {
+        if (defaultFile == null) {
+            return getDefaultErrorMessage(code);
+        }
+
+        if (defaultConfiguration == null) {
+            InputStream stream = Messages.class.getResourceAsStream(defaultFile);
+            defaultConfiguration = YamlConfiguration.loadConfiguration(new InputStreamReader(stream));
+        }
+        String message = defaultConfiguration.getString(code);
+        return message == null ? getDefaultErrorMessage(code) : message;
+    }
+
+    private static String getDefaultErrorMessage(String code) {
+        return "Error retrieving message '" + code + "'";
     }
 
     private String getText(String path, Supplier<String> defaultTextGetter) {

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) {