Implements the scrapper global edit command

Changes setting quite a bit to avoid code duplication

src/main/java/net/knarcraft/blacksmith/command/scrapper/ScrapperConfigTabCompleter.java

@@ -1,20 +1,79 @@
 package net.knarcraft.blacksmith.command.scrapper;
 
-import org.apache.commons.lang.NotImplementedException;
+import net.knarcraft.blacksmith.config.Setting;
+import net.knarcraft.blacksmith.config.scrapper.ScrapperSetting;
 import org.bukkit.command.Command;
 import org.bukkit.command.CommandSender;
 import org.bukkit.command.TabCompleter;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
+import java.util.ArrayList;
 import java.util.List;
 
+import static net.knarcraft.blacksmith.util.TabCompleteValuesHelper.getTabCompletions;
+import static net.knarcraft.knarlib.util.TabCompletionHelper.filterMatchingContains;
+
+/**
+ * The tab completer for the command used for changing global scrapper configuration options
+ */
 public class ScrapperConfigTabCompleter implements TabCompleter {
 
     @Override
-    public @Nullable List<String> onTabComplete(@NotNull CommandSender commandSender, @NotNull Command command,
-                                                @NotNull String s, @NotNull String[] strings) {
-        throw new NotImplementedException();
+    public @Nullable List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command,
+                                                @NotNull String s, @NotNull String[] args) {
+        if (!sender.hasPermission("blacksmith.admin")) {
+            return new ArrayList<>();
+        }
+
+        //Arguments: <setting> [new value/material or enchantment] []
+
+        //Prevent tab-completion when typing messages with spaces
+        if (args.length > 2 && skipCompletionForSpacedMessage(args[0])) {
+            return new ArrayList<>();
+        }
+
+        if (args.length == 1) {
+            List<String> availableCommands = new ArrayList<>();
+            availableCommands.add("reload");
+            for (Setting setting : ScrapperSetting.values()) {
+                availableCommands.add(setting.getCommandName());
+            }
+            return filterMatchingContains(availableCommands, args[0]);
+        } else if (args.length == 2) {
+            return tabCompleteCommandValues(args[0], args[1]);
+        }
+        return null;
+    }
+
+    /**
+     * Checks whether to tab-complete nothing because a message containing spaces is being written
+     *
+     * @param command <p>The command specified by the user</p>
+     * @return <p>Null if not writing a spaced message</p>
+     */
+    private boolean skipCompletionForSpacedMessage(@NotNull String command) {
+        Setting scrapperSetting = ScrapperSetting.getSetting(command);
+        return scrapperSetting != null && scrapperSetting.isMessage();
+    }
+
+    /**
+     * Tab completes the values available for the given command
+     *
+     * @param commandName  <p>The name of the used command</p>
+     * @param commandValue <p>The command value used to filter tab-completions</p>
+     * @return <p>Some valid options for the command's argument</p>
+     */
+    private List<String> tabCompleteCommandValues(@NotNull String commandName, @NotNull String commandValue) {
+        if (commandName.equalsIgnoreCase("reload")) {
+            return new ArrayList<>();
+        }
+        Setting scrapperSetting = ScrapperSetting.getSetting(commandName);
+        if (scrapperSetting != null) {
+            return filterMatchingContains(getTabCompletions(scrapperSetting.getValueType()), commandValue);
+        } else {
+            return null;
+        }
     }
 
 }