Implements the scrapper edit command

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

@@ -1,18 +1,62 @@
 package net.knarcraft.blacksmith.command.scrapper;
 
-import org.apache.commons.lang.NotImplementedException;
+import net.knarcraft.blacksmith.config.scrapper.ScrapperSetting;
+import net.knarcraft.blacksmith.util.TabCompleteValuesHelper;
+import net.knarcraft.knarlib.util.TabCompletionHelper;
 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;
 
+/**
+ * The tab completer for the scrapper editing command
+ */
 public class ScrapperEditTabCompleter 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.edit")) {
+            return new ArrayList<>();
+        }
+
+        List<String> npcSettings = new ArrayList<>();
+        for (ScrapperSetting setting : ScrapperSetting.values()) {
+            if (setting.isPerNPC()) {
+                npcSettings.add(setting.getCommandName());
+            }
+        }
+
+        if (args.length == 1) {
+            return TabCompletionHelper.filterMatchingContains(npcSettings, args[0]);
+        } else {
+            if (npcSettings.contains(args[0]) && args.length == 2) {
+                return tabCompleteCommandValues(args[0], args[1]);
+            } else {
+                return new ArrayList<>();
+            }
+        }
     }
+
+    /**
+     * 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 @Nullable List<String> tabCompleteCommandValues(@NotNull String commandName, @NotNull String commandValue) {
+        ScrapperSetting setting = ScrapperSetting.getSetting(commandName);
+        if (setting != null) {
+            return TabCompletionHelper.filterMatchingContains(TabCompleteValuesHelper.getTabCompletions(
+                    setting.getValueType()), commandValue);
+        } else {
+            return null;
+        }
+    }
+
 }