2 files changed, 35 insertions, 1 deletions
diff --git a/src/main/kotlin/features/debug/itemeditor/LegacyItemData.kt b/src/main/kotlin/features/debug/itemeditor/LegacyItemData.kt
index c0f48ca..bc8c618 100644
--- a/src/main/kotlin/features/debug/itemeditor/LegacyItemData.kt
+++ b/src/main/kotlin/features/debug/itemeditor/LegacyItemData.kt
@@ -9,6 +9,7 @@ import moe.nea.firmament.Firmament
 import moe.nea.firmament.repo.ExpensiveItemCacheApi
 import moe.nea.firmament.repo.ItemCache
 import moe.nea.firmament.util.MC
+import moe.nea.firmament.util.StringUtil.camelWords
 
 /**
  * Load data based on [prismarine.js' 1.8 item data](https://github.com/PrismarineJS/minecraft-data/blob/master/data/pc/1.8/items.json)
@@ -58,6 +59,7 @@ object LegacyItemData {
 	val enchantmentLut = enchantmentData.associateBy { Identifier.ofVanilla(it.name) }
 
 	val itemDat = getLegacyData<List<ItemData>>("items")
+
 	@OptIn(ExpensiveItemCacheApi::class) // This is fine, we get loaded in a thread.
 	val itemLut = itemDat.flatMap { item ->
 		item.allVariants().map { legacyItemType ->
@@ -72,4 +74,16 @@ object LegacyItemData {
 		}
 	}.toMap()
 
+	@Serializable
+	data class LegacyEffect(
+		val id: Int,
+		val name: String,
+		val displayName: String,
+		val type: String
+	)
+
+	val effectList = getLegacyData<List<LegacyEffect>>("effects")
+		.associateBy {
+			it.name.camelWords().map { it.trim().lowercase() }.joinToString("_")
+		}
 }
diff --git a/src/main/kotlin/features/debug/itemeditor/LegacyItemExporter.kt b/src/main/kotlin/features/debug/itemeditor/LegacyItemExporter.kt
index c35a892..ad03b16 100644
--- a/src/main/kotlin/features/debug/itemeditor/LegacyItemExporter.kt
+++ b/src/main/kotlin/features/debug/itemeditor/LegacyItemExporter.kt
@@ -7,11 +7,12 @@ import kotlinx.serialization.json.put
 import kotlin.concurrent.thread
 import net.minecraft.component.DataComponentTypes
 import net.minecraft.item.ItemStack
+import net.minecraft.nbt.NbtByte
 import net.minecraft.nbt.NbtCompound
 import net.minecraft.nbt.NbtElement
 import net.minecraft.nbt.NbtInt
+import net.minecraft.nbt.NbtList
 import net.minecraft.nbt.NbtOps
-import net.minecraft.nbt.NbtPrimitive
 import net.minecraft.nbt.NbtString
 import net.minecraft.text.Text
 import net.minecraft.util.Unit
@@ -135,6 +136,7 @@ class LegacyItemExporter private constructor(var itemStack: ItemStack) {
 		legacyNbt.put("HideFlags", NbtInt.of(254))
 		copyUnbreakable()
 		copyItemModel()
+		copyPotion()
 		copyExtraAttributes()
 		copyLegacySkullNbt()
 		copyDisplay()
@@ -144,6 +146,24 @@ class LegacyItemExporter private constructor(var itemStack: ItemStack) {
 		// TODO: copyDisplay
 	}
 
+	private fun copyPotion() {
+		val effects = itemStack.get(DataComponentTypes.POTION_CONTENTS) ?: return
+		legacyNbt.put("CustomPotionEffects", NbtList().also {
+			effects.effects.forEach { effect ->
+				val effectId = effect.effectType.key.get().value.path
+				val duration = effect.duration
+				val legacyId = LegacyItemData.effectList[effectId]!!
+
+				it.add(NbtCompound().apply {
+					put("Ambient", NbtByte.of(false))
+					put("Duration", NbtInt.of(duration))
+					put("Id", NbtByte.of(legacyId.id.toByte()))
+					put("Amplifier", NbtByte.of(effect.amplifier.toByte()))
+				})
+			}
+		})
+	}
+
 	fun NbtCompound.getOrPutCompound(name: String): NbtCompound {
 		val compound = getCompoundOrEmpty(name)
 		put(name, compound)