Fix a lot of config crashes because of null values (#902)

* Fix a lot of config crashes because of null values

* Implement suggestion

2 files changed, 66 insertions, 0 deletions

diff --git a/src/main/java/de/hysky/skyblocker/SkyblockerMod.java b/src/main/java/de/hysky/skyblocker/SkyblockerMod.java
index 4e110e15..7ede3c63 100644
--- a/src/main/java/de/hysky/skyblocker/SkyblockerMod.java
+++ b/src/main/java/de/hysky/skyblocker/SkyblockerMod.java
@@ -2,6 +2,8 @@ package de.hysky.skyblocker;
 
 import com.google.gson.Gson;
 import com.google.gson.GsonBuilder;
+
+import de.hysky.skyblocker.config.ConfigNullFieldsFix;
 import de.hysky.skyblocker.config.SkyblockerConfigManager;
 import de.hysky.skyblocker.config.datafixer.ConfigDataFixer;
 import de.hysky.skyblocker.debug.Debug;
@@ -109,6 +111,7 @@ public class SkyblockerMod implements ClientModInitializer {
         ConfigDataFixer.apply();
         Utils.init();
         SkyblockerConfigManager.init();
+        ConfigNullFieldsFix.init(); //DO NOT INIT ANY CLASS THAT USES CONFIG FIELDS BEFORE THIS!
         SkyblockerScreen.initClass();
         ProfileViewerScreen.initClass();
         Tips.init();
diff --git a/src/main/java/de/hysky/skyblocker/config/ConfigNullFieldsFix.java b/src/main/java/de/hysky/skyblocker/config/ConfigNullFieldsFix.java
new file mode 100644
index 00000000..a16b3359
--- /dev/null
+++ b/src/main/java/de/hysky/skyblocker/config/ConfigNullFieldsFix.java
@@ -0,0 +1,63 @@
+package de.hysky.skyblocker.config;
+
+import java.lang.reflect.Field;
+import java.util.Collection;
+import java.util.Map;
+
+import org.slf4j.Logger;
+
+import com.mojang.logging.LogUtils;
+
+import dev.isxander.yacl3.config.v2.api.SerialEntry;
+
+/**
+ * While this sounds like a data fixer it isn't. - It's the only reasonable solution to deal with the mine field
+ * that is YACL's null handling.
+ */
+public class ConfigNullFieldsFix {
+	private static final Logger LOGGER = LogUtils.getLogger();
+	private static final String CONFIGS_PACKAGE = "de.hysky.skyblocker.config.configs";
+
+	public static void init() {
+		SkyblockerConfig current = SkyblockerConfigManager.get();
+		SkyblockerConfig clean = new SkyblockerConfig();
+
+		try {
+			fixNullFields(current, clean);
+			SkyblockerConfigManager.save();
+		} catch (Exception e) {
+			LOGGER.error("[Skyblocker Config Null Fields Fixer] Failed to ensure that the config has no null fields! You may encounter crashes :(", e);
+		}
+	}
+
+	/**
+	 * Traverse through every config field to ensure that is isn't null, if it is then reset the value.
+	 */
+	private static void fixNullFields(Object target, Object source) throws Exception {
+		for (Field field : target.getClass().getDeclaredFields()) {
+			if (field.isAnnotationPresent(SerialEntry.class)) {
+				field.setAccessible(true);
+
+				Object targetValue = field.get(target);
+				Object sourceValue = field.get(source);
+
+				if (targetValue == null && sourceValue != null) {
+					field.set(target, sourceValue);
+				} else if (targetValue != null && sourceValue != null && isFixable(field.getType())) {
+					fixNullFields(targetValue, sourceValue);
+				}
+			}
+		}
+	}
+
+	private static boolean isFixable(Class<?> clazz) {
+		return !clazz.isPrimitive()
+				&& !clazz.isEnum()
+				&& !clazz.isRecord()
+				&& !clazz.equals(String.class)
+				&& !Number.class.isAssignableFrom(clazz)
+				&& !Map.class.isAssignableFrom(clazz)
+				&& !Collection.class.isAssignableFrom(clazz)
+				&& clazz.getPackageName().startsWith(CONFIGS_PACKAGE);
+	}
+}