4 files changed, 158 insertions, 0 deletions
diff --git a/src/main/kotlin/util/mc/InventoryUtil.kt b/src/main/kotlin/util/mc/InventoryUtil.kt
new file mode 100644
index 0000000..74f7b9f
--- /dev/null
+++ b/src/main/kotlin/util/mc/InventoryUtil.kt
@@ -0,0 +1,28 @@
+package moe.nea.firmament.util.mc
+
+import java.util.Spliterator
+import java.util.Spliterators
+import net.minecraft.inventory.Inventory
+import net.minecraft.item.ItemStack
+
+val Inventory.indices get() = 0 until size()
+val Inventory.iterableView
+	get() = object : Iterable<ItemStack> {
+		override fun spliterator(): Spliterator<ItemStack> {
+			return Spliterators.spliterator(iterator(), size().toLong(), 0)
+		}
+
+		override fun iterator(): Iterator<ItemStack> {
+			return object : Iterator<ItemStack> {
+				var i = 0
+				override fun hasNext(): Boolean {
+					return i < size()
+				}
+
+				override fun next(): ItemStack {
+					if (!hasNext()) throw NoSuchElementException()
+					return getStack(i++)
+				}
+			}
+		}
+	}
diff --git a/src/main/kotlin/util/mc/ItemUtil.kt b/src/main/kotlin/util/mc/ItemUtil.kt
new file mode 100644
index 0000000..13519cf
--- /dev/null
+++ b/src/main/kotlin/util/mc/ItemUtil.kt
@@ -0,0 +1,20 @@
+package moe.nea.firmament.util.mc
+
+import net.minecraft.item.ItemStack
+import net.minecraft.text.Text
+
+fun ItemStack.appendLore(args: List<Text>) {
+    if (args.isEmpty()) return
+    modifyLore {
+        val loreList = loreAccordingToNbt.toMutableList()
+        for (arg in args) {
+            loreList.add(arg)
+        }
+        loreList
+    }
+}
+
+fun ItemStack.modifyLore(update: (List<Text>) -> List<Text>) {
+    val loreList = loreAccordingToNbt
+    loreAccordingToNbt = update(loreList)
+}
diff --git a/src/main/kotlin/util/mc/NbtItemData.kt b/src/main/kotlin/util/mc/NbtItemData.kt
new file mode 100644
index 0000000..e8a908f
--- /dev/null
+++ b/src/main/kotlin/util/mc/NbtItemData.kt
@@ -0,0 +1,22 @@
+package moe.nea.firmament.util.mc
+
+import net.minecraft.component.DataComponentTypes
+import net.minecraft.component.type.LoreComponent
+import net.minecraft.item.ItemStack
+import net.minecraft.text.Text
+
+var ItemStack.loreAccordingToNbt
+    get() = get(DataComponentTypes.LORE)?.lines ?: listOf()
+    set(value) {
+        set(DataComponentTypes.LORE, LoreComponent(value))
+    }
+
+var ItemStack.displayNameAccordingToNbt: Text
+    get() = get(DataComponentTypes.CUSTOM_NAME) ?: get(DataComponentTypes.ITEM_NAME) ?: item.name
+    set(value) {
+        set(DataComponentTypes.CUSTOM_NAME, value)
+    }
+
+fun ItemStack.setCustomName(text: Text) {
+    set(DataComponentTypes.CUSTOM_NAME, text)
+}
diff --git a/src/main/kotlin/util/mc/SkullItemData.kt b/src/main/kotlin/util/mc/SkullItemData.kt
new file mode 100644
index 0000000..0405b65
--- /dev/null
+++ b/src/main/kotlin/util/mc/SkullItemData.kt
@@ -0,0 +1,88 @@
+@file:UseSerializers(DashlessUUIDSerializer::class, InstantAsLongSerializer::class)
+
+package moe.nea.firmament.util.mc
+
+import com.mojang.authlib.GameProfile
+import com.mojang.authlib.minecraft.MinecraftProfileTexture
+import com.mojang.authlib.properties.Property
+import java.util.UUID
+import kotlinx.datetime.Clock
+import kotlinx.datetime.Instant
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.UseSerializers
+import kotlinx.serialization.encodeToString
+import net.minecraft.component.DataComponentTypes
+import net.minecraft.component.type.ProfileComponent
+import net.minecraft.item.ItemStack
+import net.minecraft.item.Items
+import moe.nea.firmament.Firmament
+import moe.nea.firmament.util.Base64Util.padToValidBase64
+import moe.nea.firmament.util.assertTrueOr
+import moe.nea.firmament.util.json.DashlessUUIDSerializer
+import moe.nea.firmament.util.json.InstantAsLongSerializer
+
+@Serializable
+data class MinecraftProfileTextureKt(
+    val url: String,
+    val metadata: Map<String, String> = mapOf(),
+)
+
+@Serializable
+data class MinecraftTexturesPayloadKt(
+    val textures: Map<MinecraftProfileTexture.Type, MinecraftProfileTextureKt> = mapOf(),
+    val profileId: UUID? = null,
+    val profileName: String? = null,
+    val isPublic: Boolean = true,
+    val timestamp: Instant = Clock.System.now(),
+)
+
+fun GameProfile.setTextures(textures: MinecraftTexturesPayloadKt) {
+    val json = Firmament.json.encodeToString(textures)
+    val encoded = java.util.Base64.getEncoder().encodeToString(json.encodeToByteArray())
+    properties.put(propertyTextures, Property(propertyTextures, encoded))
+}
+
+private val propertyTextures = "textures"
+
+fun ItemStack.setEncodedSkullOwner(uuid: UUID, encodedData: String) {
+    assert(this.item == Items.PLAYER_HEAD)
+    val gameProfile = GameProfile(uuid, "LameGuy123")
+    gameProfile.properties.put(propertyTextures, Property(propertyTextures, encodedData.padToValidBase64()))
+    this.set(DataComponentTypes.PROFILE, ProfileComponent(gameProfile))
+}
+
+val zeroUUID = UUID.fromString("d3cb85e2-3075-48a1-b213-a9bfb62360c1")
+fun createSkullItem(uuid: UUID, url: String) = ItemStack(Items.PLAYER_HEAD)
+    .also { it.setSkullOwner(uuid, url) }
+
+fun ItemStack.setSkullOwner(uuid: UUID, url: String) {
+    assert(this.item == Items.PLAYER_HEAD)
+    val gameProfile = GameProfile(uuid, "nea89")
+    gameProfile.setTextures(
+        MinecraftTexturesPayloadKt(
+            textures = mapOf(MinecraftProfileTexture.Type.SKIN to MinecraftProfileTextureKt(url)),
+            profileId = uuid,
+            profileName = "nea89",
+        )
+    )
+    this.set(DataComponentTypes.PROFILE, ProfileComponent(gameProfile))
+}
+
+
+fun decodeProfileTextureProperty(property: Property): MinecraftTexturesPayloadKt? {
+    assertTrueOr(property.name == propertyTextures) { return null }
+    return try {
+        var encodedF: String = property.value
+        while (encodedF.length % 4 != 0 && encodedF.last() == '=') {
+            encodedF = encodedF.substring(0, encodedF.length - 1)
+        }
+        val json = java.util.Base64.getDecoder().decode(encodedF).decodeToString()
+        Firmament.json.decodeFromString<MinecraftTexturesPayloadKt>(json)
+    } catch (e: Exception) {
+        // Malformed profile data
+        if (Firmament.DEBUG)
+            e.printStackTrace()
+        null
+    }
+}
+