Implement ability to import/generate default.json file.

Remove old unnecessary methods.

Improve default.json challenges.

src/main/java/world/bentobox/challenges/ChallengesImportManager.java

@@ -220,8 +220,7 @@ private List<ItemStack> parseItems(String reqList) {
      * @param world Target world.
      * @return <code>true</code> if everything was successful, otherwise <code>false</code>.
      */
-	@SuppressWarnings("unused")
-    private boolean loadDefaultChallenges(User user, World world)
+    public boolean loadDefaultChallenges(User user, World world)
     {
         ChallengesManager manager = this.addon.getChallengesManager();
 
@@ -299,13 +298,45 @@ private boolean loadDefaultChallenges(User user, World world)
     /**
      * Create method that can generate default challenge file from existing challenges in given world.
      * This method will create default.json file in Challenges folder.
+	 * @param user User who calls this method.
      * @param world from which challenges must be stored.
+	 * @param overwrite indicates if existing default.json file can be overwritten.
+	 * @return <code>true</code> if everything was successful, otherwise <code>false</code>
      */
-    @SuppressWarnings("unused")
-    private void generateDefaultChallengeFile(World world)
+    public boolean generateDefaultChallengeFile(User user, World world, boolean overwrite)
     {
         File defaultFile = new File(this.addon.getDataFolder(), "default.json");
 
+        if (defaultFile.exists())
+		{
+			if (overwrite)
+			{
+				if (user.isPlayer())
+				{
+					user.sendMessage("challenges.messages.defaults-file-overwrite");
+				}
+				else
+				{
+					this.addon.logWarning("challenges.messages.defaults-file-overwrite");
+				}
+
+				defaultFile.delete();
+			}
+			else
+			{
+				if (user.isPlayer())
+				{
+					user.sendMessage("challenges.errors.defaults-file-exist");
+				}
+				else
+				{
+					this.addon.logWarning("challenges.errors.defaults-file-exist");
+				}
+
+				return false;
+			}
+		}
+
         try
         {
             if (defaultFile.createNewFile())
@@ -358,9 +389,28 @@ private void generateDefaultChallengeFile(World world)
         }
         catch (IOException e)
         {
-            this.addon.logError("Could not save json file: " + e.getMessage());
-        }
-    }
+			if (user.isPlayer())
+			{
+				user.sendMessage("challenges.errors.defaults-file-error");
+			}
+
+			this.addon.logError("Could not save json file: " + e.getMessage());
+			return false;
+		}
+        finally
+		{
+			if (user.isPlayer())
+			{
+				user.sendMessage("challenges.messages.defaults-file-completed", "[world]", world.getName());
+			}
+			else
+			{
+				this.addon.logWarning("challenges.messages.defaults-file-completed");
+			}
+		}
+
+		return true;
+	}
 
 
     // ---------------------------------------------------------------------
@@ -392,7 +442,7 @@ private final class DefaultJSONHandler
 			builder.disableHtmlEscaping();
 
 			this.addon = addon;
-			this.gson = builder.create();
+			this.gson = builder.setPrettyPrinting().create();
         }
 
 

src/main/java/world/bentobox/challenges/commands/admin/Challenges.java

@@ -8,35 +8,44 @@
 import world.bentobox.challenges.panel.admin.AdminGUI;
 
 
-public class Challenges extends CompositeCommand {
+public class Challenges extends CompositeCommand
+{
 
     /**
      * Admin command for challenges
+     *
      * @param parent
      */
-    public Challenges(ChallengesAddon addon, CompositeCommand parent) {
+    public Challenges(ChallengesAddon addon, CompositeCommand parent)
+    {
         super(addon, parent, "challenges");
     }
 
+
     @Override
-    public void setup() {
+    public void setup()
+    {
         this.setPermission("admin.challenges");
         this.setParametersHelp("challenges.commands.admin.main.parameters");
         this.setDescription("challenges.commands.admin.main.description");
+
         // Register sub commands
-        new ImportCommand(getAddon(), this);
-        // new CompleteChallenge(getAddon(), this);
-        new ReloadChallenges(getAddon(), this);
-        new ResetChallenge(getAddon(), this);
-        //new ShowChallenges(getAddon(), this);
-        //new CreateChallenge(getAddon(), this);
 
+        // This method reloads challenges addon
+        new ReloadChallenges(getAddon(), this);
+        // Import ASkyBlock Challenges
+        new ImportCommand(getAddon(), this);
+        // Defaults processing command
+        new DefaultsCommand(this.getAddon(), this);
     }
 
+
     @Override
-    public boolean execute(User user, String label, List<String> args) {
+    public boolean execute(User user, String label, List<String> args)
+    {
         // Open up the admin challenges GUI
-        if (user.isPlayer()) {
+        if (user.isPlayer())
+        {
             new AdminGUI((ChallengesAddon) this.getAddon(),
                 this.getWorld(),
                 user,
@@ -47,5 +56,4 @@ public boolean execute(User user, String label, List<String> args) {
         }
         return false;
     }
-
 }