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use azalea_block::BlockState;
use azalea_buf::{BufReadError, McBufVarReadable};
use azalea_buf::{McBuf, McBufReadable, McBufWritable};
use azalea_chat::Component;
use azalea_core::{BlockPos, Direction, GlobalPos, Particle, Slot};
use enum_as_inner::EnumAsInner;
use log::warn;
use nohash_hasher::IntSet;
use std::io::{Cursor, Write};
use uuid::Uuid;
#[derive(Clone, Debug)]
pub struct EntityMetadataItems(pub Vec<EntityDataItem>);
#[derive(Clone, Debug)]
pub struct EntityDataItem {
// we can't identify what the index is for here because we don't know the
// entity type
pub index: u8,
pub value: EntityDataValue,
}
impl McBufReadable for EntityMetadataItems {
fn read_from(buf: &mut Cursor<&[u8]>) -> Result<Self, BufReadError> {
let mut metadata = Vec::new();
loop {
let index = u8::read_from(buf)?;
if index == 0xff {
break;
}
let value = EntityDataValue::read_from(buf)?;
metadata.push(EntityDataItem { index, value });
}
Ok(EntityMetadataItems(metadata))
}
}
impl McBufWritable for EntityMetadataItems {
fn write_into(&self, buf: &mut impl Write) -> Result<(), std::io::Error> {
for item in &self.0 {
item.index.write_into(buf)?;
item.value.write_into(buf)?;
}
0xffu8.write_into(buf)?;
Ok(())
}
}
#[derive(Clone, Debug, EnumAsInner)]
pub enum EntityDataValue {
Byte(u8),
Int(i32),
Float(f32),
String(String),
Component(Component),
OptionalComponent(Option<Component>),
ItemStack(Slot),
Boolean(bool),
Rotations(Rotations),
BlockPos(BlockPos),
OptionalBlockPos(Option<BlockPos>),
Direction(Direction),
OptionalUuid(Option<Uuid>),
// 0 for absent (implies air); otherwise, a block state ID as per the global palette
// this is a varint
OptionalBlockState(Option<BlockState>),
CompoundTag(azalea_nbt::Tag),
Particle(Particle),
VillagerData(VillagerData),
// 0 for absent; 1 + actual value otherwise. Used for entity IDs.
OptionalUnsignedInt(Option<u32>),
Pose(Pose),
CatVariant(azalea_registry::CatVariant),
FrogVariant(azalea_registry::FrogVariant),
GlobalPos(GlobalPos),
PaintingVariant(azalea_registry::PaintingVariant),
}
#[derive(Clone, Debug, McBuf, Default)]
pub struct Rotations {
pub x: f32,
pub y: f32,
pub z: f32,
}
impl McBufReadable for EntityDataValue {
fn read_from(buf: &mut Cursor<&[u8]>) -> Result<Self, BufReadError> {
let data_type = u32::var_read_from(buf)?;
Ok(match data_type {
0 => EntityDataValue::Byte(u8::read_from(buf)?),
1 => EntityDataValue::Int(i32::var_read_from(buf)?),
2 => EntityDataValue::Float(f32::read_from(buf)?),
3 => EntityDataValue::String(String::read_from(buf)?),
4 => EntityDataValue::Component(Component::read_from(buf)?),
5 => EntityDataValue::OptionalComponent(Option::<Component>::read_from(buf)?),
6 => EntityDataValue::ItemStack(Slot::read_from(buf)?),
7 => EntityDataValue::Boolean(bool::read_from(buf)?),
8 => EntityDataValue::Rotations(Rotations::read_from(buf)?),
9 => EntityDataValue::BlockPos(BlockPos::read_from(buf)?),
10 => EntityDataValue::OptionalBlockPos(Option::<BlockPos>::read_from(buf)?),
11 => EntityDataValue::Direction(Direction::read_from(buf)?),
12 => EntityDataValue::OptionalUuid(Option::<Uuid>::read_from(buf)?),
13 => EntityDataValue::OptionalBlockState({
let val = u32::var_read_from(buf)?;
if val == 0 {
None
} else {
Some(BlockState::try_from(val - 1).unwrap_or_else(|_| {
warn!("Invalid block state ID {} in entity metadata", val - 1);
BlockState::Air
}))
}
}),
14 => EntityDataValue::CompoundTag(azalea_nbt::Tag::read_from(buf)?),
15 => EntityDataValue::Particle(Particle::read_from(buf)?),
16 => EntityDataValue::VillagerData(VillagerData::read_from(buf)?),
17 => EntityDataValue::OptionalUnsignedInt({
let val = u32::var_read_from(buf)?;
if val == 0 {
None
} else {
Some(val - 1)
}
}),
18 => EntityDataValue::Pose(Pose::read_from(buf)?),
19 => EntityDataValue::CatVariant(azalea_registry::CatVariant::read_from(buf)?),
20 => EntityDataValue::FrogVariant(azalea_registry::FrogVariant::read_from(buf)?),
21 => EntityDataValue::GlobalPos(GlobalPos::read_from(buf)?),
22 => {
EntityDataValue::PaintingVariant(azalea_registry::PaintingVariant::read_from(buf)?)
}
_ => {
return Err(BufReadError::UnexpectedEnumVariant {
id: data_type as i32,
})
}
})
}
}
impl McBufWritable for EntityDataValue {
fn write_into(&self, _buf: &mut impl Write) -> Result<(), std::io::Error> {
todo!();
}
}
#[derive(Clone, Debug, Copy, McBuf, Default)]
pub enum Pose {
#[default]
Standing = 0,
FallFlying,
Sleeping,
Swimming,
SpinAttack,
Sneaking,
LongJumping,
Dying,
}
#[derive(Debug, Clone, McBuf, Default)]
pub struct VillagerData {
#[var]
type_: u32,
#[var]
profession: u32,
#[var]
level: u32,
}
impl TryFrom<EntityMetadataItems> for Vec<EntityDataValue> {
type Error = String;
fn try_from(data: EntityMetadataItems) -> Result<Self, Self::Error> {
let mut data = data.0;
data.sort_by(|a, b| a.index.cmp(&b.index));
let mut prev_indexes = IntSet::default();
let len = data.len();
// check to make sure it's valid, in vanilla this is guaranteed to pass
// but it's possible there's mods that mess with it so we want to make
// sure it's good
for item in &data {
if prev_indexes.contains(&item.index) {
return Err(format!("Index {} is duplicated", item.index));
}
if item.index as usize > len {
return Err(format!("Index {} is too big", item.index));
}
prev_indexes.insert(item.index);
}
let data = data.into_iter().map(|d| d.value).collect();
Ok(data)
}
}
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