Replaces all old functionality with a config command

src/main/java/net/knarcraft/stargatecommand/command/ConfigTabCompleter.java

@@ -0,0 +1,156 @@
+package net.knarcraft.stargatecommand.command;
+
+import net.TheDgtl.Stargate.config.ConfigurationOption;
+import net.TheDgtl.Stargate.config.OptionDataType;
+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;
+
+/**
+ * This is the completer for stargates config sub-command (/sg config)
+ */
+public class ConfigTabCompleter implements TabCompleter {
+
+    private List<String> booleans;
+    private List<String> integers;
+    private List<String> chatColors;
+    private List<String> doubles;
+
+    @Nullable
+    @Override
+    public List<String> onTabComplete(@NotNull CommandSender commandSender, @NotNull Command command, @NotNull String s,
+                                      @NotNull String[] args) {
+        if (booleans == null || integers == null || chatColors == null) {
+            initializeAutoCompleteLists();
+        }
+        if (args.length > 1) {
+            ConfigurationOption selectedOption;
+            try {
+                selectedOption = ConfigurationOption.valueOf(args[0].toUpperCase());
+            } catch (IllegalArgumentException exception) {
+                return new ArrayList<>();
+            }
+            return getPossibleOptionValues(selectedOption, args[1]);
+        } else {
+            List<String> configOptionNames = new ArrayList<>();
+            for (ConfigurationOption option : ConfigurationOption.values()) {
+                configOptionNames.add(option.name());
+            }
+            return filterMatching(configOptionNames, args[0]);
+        }
+    }
+
+    /**
+     * Find completable strings which match the text typed by the command's sender
+     *
+     * @param values    <p>The values to filter</p>
+     * @param typedText <p>The text the player has started typing</p>
+     * @return <p>The given string values which start with the player's typed text</p>
+     */
+    private List<String> filterMatching(List<String> values, String typedText) {
+        List<String> configValues = new ArrayList<>();
+        for (String value : values) {
+            if (value.toLowerCase().startsWith(typedText.toLowerCase())) {
+                configValues.add(value);
+            }
+        }
+        return configValues;
+    }
+
+    /**
+     * Get possible values for the selected option
+     *
+     * @param selectedOption <p>The selected option</p>
+     * @param typedText      <p>The beginning of the typed text, for filtering matching results</p>
+     * @return <p>Some or all of the valid values for the option</p>
+     */
+    private List<String> getPossibleOptionValues(ConfigurationOption selectedOption, String typedText) {
+        switch (selectedOption) {
+            case LANGUAGE:
+                //Return available languages
+                return filterMatching(List.of(OptionDataType.LANGUAGE.getValues()), typedText);
+            case DEFAULT_NETWORK:
+                //Just return the default value as most values should be possible
+                if (typedText.trim().isEmpty()) {
+                    return putStringInList((String) selectedOption.getDefaultValue());
+                } else {
+                    return new ArrayList<>();
+                }
+        }
+        
+        if (selectedOption.getDataType() == OptionDataType.COLOR) {
+            return filterMatching(chatColors, typedText);
+        }
+
+        //If the config value is a boolean, show the two boolean values
+        if (selectedOption.getDataType() == OptionDataType.BOOLEAN) {
+            return filterMatching(booleans, typedText);
+        }
+
+        //If the config value is an integer, display some valid numbers
+        if (selectedOption.getDataType() == OptionDataType.INTEGER) {
+            if (typedText.trim().isEmpty()) {
+                return integers;
+            } else {
+                return new ArrayList<>();
+            }
+        }
+
+        //If the config value is a double, display some valid numbers
+        if (selectedOption.getDataType() == OptionDataType.DOUBLE) {
+            if (typedText.trim().isEmpty()) {
+                return doubles;
+            } else {
+                return new ArrayList<>();
+            }
+        }
+        return null;
+    }
+
+    /**
+     * Puts a single string value into a string list
+     *
+     * @param value <p>The string to make into a list</p>
+     * @return <p>A list containing the string value</p>
+     */
+    private List<String> putStringInList(String value) {
+        List<String> list = new ArrayList<>();
+        list.add(value);
+        return list;
+    }
+
+    /**
+     * Initializes all lists of auto-completable values
+     */
+    private void initializeAutoCompleteLists() {
+        booleans = new ArrayList<>();
+        booleans.add("true");
+        booleans.add("false");
+
+        integers = new ArrayList<>();
+        integers.add("0");
+        integers.add("5");
+
+        getColors();
+
+        doubles = new ArrayList<>();
+        doubles.add("5");
+        doubles.add("1");
+        doubles.add("0.5");
+        doubles.add("0.1");
+    }
+
+
+    /**
+     * Initializes the list of chat colors
+     */
+    private void getColors() {
+        chatColors = List.of(OptionDataType.COLOR.getValues());
+    }
+
+}