Only show relevant server whitelists

Show Whitelist config in whitelist mode, and Blacklist in blacklist mode.

Don't show either in "no restriction" mode.

common/src/main/java/net/xolt/freecam/config/gui/AutoConfigExtensions.java

@@ -21,5 +21,6 @@ private AutoConfigExtensions() {}
     public static void apply(Class<? extends ConfigData> configClass) {
         GuiRegistry registry = AutoConfig.getGuiRegistry(configClass);
         VariantTooltipImpl.apply(registry);
+        ServerRestrictionDependencies.apply(registry);
     }
 }

common/src/main/java/net/xolt/freecam/config/gui/ServerRestrictionDependencies.java

@@ -0,0 +1,52 @@
+package net.xolt.freecam.config.gui;
+
+import me.shedaniel.autoconfig.gui.registry.GuiRegistry;
+import me.shedaniel.clothconfig2.gui.entries.SelectionListEntry;
+import me.shedaniel.clothconfig2.gui.entries.StringListListEntry;
+import net.xolt.freecam.config.ModConfig;
+
+class ServerRestrictionDependencies {
+
+    private static SelectionListEntry<ModConfig.ServerRestriction> mode;
+
+    static void apply(GuiRegistry registry) {
+        // Capture a reference to the mode entry
+        registry.registerPredicateTransformer(
+                (guis, i18n, field, config, defaults, guiProvider) -> {
+                    //noinspection unchecked
+                    mode = guis.stream()
+                            .filter(SelectionListEntry.class::isInstance)
+                            .map(SelectionListEntry.class::cast)
+                            .filter(entry -> entry.getValue() instanceof ModConfig.ServerRestriction)
+                            .reduce((prev, next) -> { throw new IllegalStateException("Multiple selection entries added to %s.mode".formatted(ModConfig.ServerConfig.class.getSimpleName())); })
+                            .orElseThrow(() -> new IllegalStateException("No selection entries added to %s.mode".formatted(ModConfig.ServerConfig.class.getSimpleName())));
+                    return guis;
+                },
+                field -> field.getDeclaringClass().equals(ModConfig.ServerConfig.class) && field.getName().equals("mode")
+        );
+
+        // Whitelist dependency
+        registry.registerPredicateTransformer(
+                (guis, i18n, field, config, defaults, guiProvider) -> {
+                    guis.stream()
+                            .filter(StringListListEntry.class::isInstance)
+                            .map(StringListListEntry.class::cast)
+                            .forEach(entry -> entry.setDisplayRequirement(() -> mode == null || mode.getValue().equals(ModConfig.ServerRestriction.WHITELIST)));
+                    return guis;
+                },
+                field -> field.getDeclaringClass().equals(ModConfig.ServerConfig.class) && field.getName().equals("whitelist")
+        );
+
+        // Blacklist dependency
+        registry.registerPredicateTransformer(
+                (guis, i18n, field, config, defaults, guiProvider) -> {
+                    guis.stream()
+                            .filter(StringListListEntry.class::isInstance)
+                            .map(StringListListEntry.class::cast)
+                            .forEach(entry -> entry.setDisplayRequirement(() -> mode == null || mode.getValue().equals(ModConfig.ServerRestriction.BLACKLIST)));
+                    return guis;
+                },
+                field -> field.getDeclaringClass().equals(ModConfig.ServerConfig.class) && field.getName().equals("blacklist")
+        );
+    }
+}