From 72a65de83fed48e9451cc188cb4572e69ace5b04 Mon Sep 17 00:00:00 2001
From: FalsePattern <30945458+FalsePattern@users.noreply.github.com>
Date: Sun, 3 Jul 2022 00:36:21 +0200
Subject: [PATCH] properly fix dragonapi compat

---
 .../endlessids/mixin/plugin/MixinPlugin.java  |  4 +-
 .../endlessids/mixin/plugin/TargetedMod.java  |  6 +-
 .../mixin/util/DragonAPICompat.java           | 74 +++++++++++++++++++
 3 files changed, 82 insertions(+), 2 deletions(-)
 create mode 100644 src/main/java/com/falsepattern/endlessids/mixin/util/DragonAPICompat.java

diff --git a/src/main/java/com/falsepattern/endlessids/mixin/plugin/MixinPlugin.java b/src/main/java/com/falsepattern/endlessids/mixin/plugin/MixinPlugin.java
index 0e10827..d1a6970 100644
--- a/src/main/java/com/falsepattern/endlessids/mixin/plugin/MixinPlugin.java
+++ b/src/main/java/com/falsepattern/endlessids/mixin/plugin/MixinPlugin.java
@@ -8,8 +8,10 @@ import lombok.Getter;
 import org.apache.logging.log4j.Logger;
 
 public class MixinPlugin implements IMixinPlugin {
+    public static final Logger LOG = IMixinPlugin.createLogger(Tags.MODNAME);
+
     @Getter
-    private final Logger logger = IMixinPlugin.createLogger(Tags.MODNAME);
+    private final Logger logger = LOG;
 
     @Override
     public IMixin[] getMixinEnumValues() {
diff --git a/src/main/java/com/falsepattern/endlessids/mixin/plugin/TargetedMod.java b/src/main/java/com/falsepattern/endlessids/mixin/plugin/TargetedMod.java
index 3635ca1..b2fc46d 100644
--- a/src/main/java/com/falsepattern/endlessids/mixin/plugin/TargetedMod.java
+++ b/src/main/java/com/falsepattern/endlessids/mixin/plugin/TargetedMod.java
@@ -1,5 +1,6 @@
 package com.falsepattern.endlessids.mixin.plugin;
 
+import com.falsepattern.endlessids.mixin.util.DragonAPICompat;
 import com.falsepattern.lib.mixin.ITargetedMod;
 import lombok.Getter;
 import lombok.RequiredArgsConstructor;
@@ -15,7 +16,10 @@ public enum TargetedMod implements ITargetedMod {
     ATG("Alternate Terrain Generation", true, startsWith("atg")),
     BOP("Biomes O' Plenty", true, startsWith("biomesoplenty-")),
     COFHLIB("CoFH Lib", true, startsWith("cofhlib-")),
-    DRAGONAPI("DragonAPI", false, startsWith("dragonapi")),
+    DRAGONAPI("DragonAPI", false, startsWith("dragonapi").and((x) -> {
+        DragonAPICompat.activate();
+        return true;
+    })),
     GALACTICRAFTCORE("GalactiCraftCore", false, startsWith("galacticraftcore")),
     MFQM("More Fun Quicksand Mod", false, startsWith("morefunquicksandmod-")),
     UBC("Underground Biomes Constructs", false, startsWith("undergroundbiomesconstructs-")),
diff --git a/src/main/java/com/falsepattern/endlessids/mixin/util/DragonAPICompat.java b/src/main/java/com/falsepattern/endlessids/mixin/util/DragonAPICompat.java
new file mode 100644
index 0000000..399bb2f
--- /dev/null
+++ b/src/main/java/com/falsepattern/endlessids/mixin/util/DragonAPICompat.java
@@ -0,0 +1,74 @@
+package com.falsepattern.endlessids.mixin.util;
+
+import com.falsepattern.endlessids.mixin.plugin.MixinPlugin;
+import lombok.SneakyThrows;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+import cpw.mods.fml.common.Loader;
+
+import java.lang.reflect.Field;
+import java.util.Collections;
+
+public class DragonAPICompat {
+    private static boolean activated = false;
+
+    public static void activate() {
+        if (activated) return;
+        activated = true;
+        Logger LOG = LogManager.getLogger(MixinPlugin.LOG.getName() + " DragonAPI Compat Patcher");
+        LOG.info("DragonAPI detected. Activating very early compatibility patches.");
+        int total = 1;
+        int complete = 0;
+        try {
+            patchFML(LOG);
+            complete++;
+        } catch (Throwable t) {
+            LOG.fatal("Failed to load early DragonAPI compat patches! Crash imminent! Successful: " + complete + ", Total: " + total, t);
+        }
+        LOG.info("DragonAPI early compat patching finished! Resuming normal loading.");
+    }
+
+    @SneakyThrows
+    private static void patchFML(Logger baseLog) {
+        Logger LOG = LogManager.getLogger(baseLog.getName() + " FML Tweaker");
+        LOG.info("Patching FML loader class...");
+        try {
+            LOG.info("Attempting to get a reference to " + Loader.class.getName() +
+                                  ".namedMods with reflection...");
+            Field f;
+            try {
+                f = Loader.class.getDeclaredField("namedMods");
+                LOG.info("[OK] Reference retrieved!");
+            } catch (Throwable t) {
+                LOG.error("[FAIL] Failed to retrieve the field!");
+                throw t;
+            }
+            LOG.info("[INFO] Making the reference accessible...");
+            try {
+                f.setAccessible(true);
+                LOG.info("[OK] Reference is now accessible!");
+            } catch (Throwable t) {
+                LOG.error("[FAIL] Failed to make the reference accessible!");
+                throw t;
+            }
+
+            LOG.info("[INFO] Inserting placeholder Collections.emptyMap() object into the field...");
+            try {
+                if (f.get(Loader.instance()) != null) {
+                    LOG.info("[OK] Field already had a value, not replacing.");
+                } else {
+                    f.set(Loader.instance(), Collections.emptyMap());
+                    LOG.info("[OK] Successfully inserted placeholder object!");
+                }
+            } catch (Throwable t) {
+                LOG.error("[FAIL] Failed to insert placeholder object!");
+                throw t;
+            }
+            LOG.info("FML Loader class patched successfully!");
+        } catch (Throwable t) {
+            LOG.error("Failed to patch FML Loader class! Check the log file for debug info!");
+            throw t;
+        }
+    }
+}