PaperMC/paper-server/patches/sources/net/minecraft/world/entity/LightningBolt.java.patch

--- a/net/minecraft/world/entity/LightningBolt.java
+++ b/net/minecraft/world/entity/LightningBolt.java
@@ -39,6 +_,7 @@
     private ServerPlayer cause;
     private final Set<Entity> hitEntities = Sets.newHashSet();
     private int blocksSetOnFire;
+    public boolean isEffect; // Paper - Properly handle lightning effects api
 
     public LightningBolt(EntityType<? extends LightningBolt> entityType, Level level) {
         super(entityType, level);
@@ -76,7 +_,7 @@
     @Override
     public void tick() {
         super.tick();
-        if (this.life == 2) {
+        if (!this.isEffect && this.life == 2) { // Paper - Properly handle lightning effects api
             if (this.level().isClientSide()) {
                 this.level()
                     .playLocalSound(
@@ -107,7 +_,7 @@
                 }
 
                 this.powerLightningRod();
-                clearCopperOnLightningStrike(this.level(), this.getStrikePosition());
+                clearCopperOnLightningStrike(this.level(), this.getStrikePosition(), this); // Paper - Call EntityChangeBlockEvent
                 this.gameEvent(GameEvent.LIGHTNING_STRIKE);
             }
         }
@@ -130,7 +_,7 @@
                     }
                 }
 
-                this.discard();
+                this.discard(org.bukkit.event.entity.EntityRemoveEvent.Cause.DESPAWN); // CraftBukkit - add Bukkit remove cause
             } else if (this.life < -this.random.nextInt(10)) {
                 this.flashes--;
                 this.life = 1;
@@ -139,10 +_,10 @@
             }
         }
 
-        if (this.life >= 0) {
+        if (this.life >= 0 && !this.isEffect) { // CraftBukkit - add !this.visualOnly // Paper - Properly handle lightning effects api
             if (!(this.level() instanceof ServerLevel)) {
                 this.level().setSkyFlashTime(2);
-            } else if (!this.visualOnly) {
+            } else if (!this.visualOnly && !this.isEffect) { // Paper - Properly handle lightning effects api
                 List<Entity> entities = this.level()
                     .getEntities(
                         this,
@@ -168,26 +_,34 @@
     }
 
     private void spawnFire(int extraIgnitions) {
-        if (!this.visualOnly && this.level() instanceof ServerLevel serverLevel && serverLevel.getGameRules().getBoolean(GameRules.RULE_DOFIRETICK)) {
+        if (!this.visualOnly && !this.isEffect && this.level() instanceof ServerLevel serverLevel && serverLevel.getGameRules().getBoolean(GameRules.RULE_DOFIRETICK)) { // Paper - prevent any fire if only effect
             BlockPos blockPos = this.blockPosition();
             BlockState state = BaseFireBlock.getState(this.level(), blockPos);
             if (this.level().getBlockState(blockPos).isAir() && state.canSurvive(this.level(), blockPos)) {
-                this.level().setBlockAndUpdate(blockPos, state);
-                this.blocksSetOnFire++;
+                // CraftBukkit start - add "!visualOnly"
+                if (!this.visualOnly && !org.bukkit.craftbukkit.event.CraftEventFactory.callBlockIgniteEvent(this.level(), blockPos, this).isCancelled()) {
+                    this.level().setBlockAndUpdate(blockPos, state);
+                    this.blocksSetOnFire++;
+                }
+                // CraftBukkit end
             }
 
             for (int i = 0; i < extraIgnitions; i++) {
                 BlockPos blockPos1 = blockPos.offset(this.random.nextInt(3) - 1, this.random.nextInt(3) - 1, this.random.nextInt(3) - 1);
                 state = BaseFireBlock.getState(this.level(), blockPos1);
                 if (this.level().getBlockState(blockPos1).isAir() && state.canSurvive(this.level(), blockPos1)) {
-                    this.level().setBlockAndUpdate(blockPos1, state);
-                    this.blocksSetOnFire++;
+                    // CraftBukkit start - add "!visualOnly"
+                    if (!this.visualOnly && !org.bukkit.craftbukkit.event.CraftEventFactory.callBlockIgniteEvent(this.level(), blockPos1, this).isCancelled()) {
+                        this.level().setBlockAndUpdate(blockPos1, state);
+                        this.blocksSetOnFire++;
+                    }
+                    // CraftBukkit end
                 }
             }
         }
     }
 
-    private static void clearCopperOnLightningStrike(Level level, BlockPos pos) {
+    private static void clearCopperOnLightningStrike(Level level, BlockPos pos, Entity lightning) { // Paper - Call EntityChangeBlockEvent
         BlockState blockState = level.getBlockState(pos);
         BlockPos blockPos;
         BlockState blockState1;
@@ -200,22 +_,27 @@
         }
 
         if (blockState1.getBlock() instanceof WeatheringCopper) {
-            level.setBlockAndUpdate(blockPos, WeatheringCopper.getFirst(level.getBlockState(blockPos)));
+            // Paper start - Call EntityChangeBlockEvent
+            BlockState newBlockState = WeatheringCopper.getFirst(level.getBlockState(blockPos));
+            if (org.bukkit.craftbukkit.event.CraftEventFactory.callEntityChangeBlockEvent(lightning, blockPos, newBlockState)) {
+                level.setBlockAndUpdate(blockPos, newBlockState);
+            }
+            // Paper end - Call EntityChangeBlockEvent
             BlockPos.MutableBlockPos mutableBlockPos = pos.mutable();
             int i = level.random.nextInt(3) + 3;
 
             for (int i1 = 0; i1 < i; i1++) {
                 int i2 = level.random.nextInt(8) + 1;
-                randomWalkCleaningCopper(level, blockPos, mutableBlockPos, i2);
+                randomWalkCleaningCopper(level, blockPos, mutableBlockPos, i2, lightning); // Paper - transmit LightningBolt instance to call EntityChangeBlockEvent
             }
         }
     }
 
-    private static void randomWalkCleaningCopper(Level level, BlockPos pos, BlockPos.MutableBlockPos mutable, int steps) {
+    private static void randomWalkCleaningCopper(Level level, BlockPos pos, BlockPos.MutableBlockPos mutable, int steps, Entity lightning) { // Paper - transmit LightningBolt instance to call EntityChangeBlockEvent
         mutable.set(pos);
 
         for (int i = 0; i < steps; i++) {
-            Optional<BlockPos> optional = randomStepCleaningCopper(level, mutable);
+            Optional<BlockPos> optional = randomStepCleaningCopper(level, mutable, lightning); // Paper - transmit LightningBolt instance to call EntityChangeBlockEvent
             if (optional.isEmpty()) {
                 break;
             }
@@ -224,11 +_,17 @@
         }
     }
 
-    private static Optional<BlockPos> randomStepCleaningCopper(Level level, BlockPos pos) {
+    private static Optional<BlockPos> randomStepCleaningCopper(Level level, BlockPos pos, Entity lightning) { // Paper - transmit LightningBolt instance to call EntityChangeBlockEvent
         for (BlockPos blockPos : BlockPos.randomInCube(level.random, 10, pos, 1)) {
             BlockState blockState = level.getBlockState(blockPos);
             if (blockState.getBlock() instanceof WeatheringCopper) {
-                WeatheringCopper.getPrevious(blockState).ifPresent(blockState1 -> level.setBlockAndUpdate(blockPos, blockState1));
+                // Paper start - call EntityChangeBlockEvent
+                WeatheringCopper.getPrevious(blockState).ifPresent(blockState1 -> {
+                    if (org.bukkit.craftbukkit.event.CraftEventFactory.callEntityChangeBlockEvent(lightning, blockPos, blockState1)) {
+                        level.setBlockAndUpdate(blockPos, blockState1);
+                    }
+                });
+                // Paper end - call EntityChangeBlockEvent
                 level.levelEvent(3002, blockPos, -1);
                 return Optional.of(blockPos);
             }