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use std::{
fmt::{self, Display},
hash::{Hash, Hasher},
io::{self, Cursor},
};
use azalea_buf::{AzBuf, AzBufVar, BufReadError};
use derive_more::{Deref, DerefMut};
// note: this is here instead of in azalea-entity because azalea-world depends
// on it. and this isn't in azalea-world so azalea-protocol doesn't need to
// depend on azalea-world.
/// An entity ID used by Minecraft.
///
/// These IDs are picked by the server. Some server software (like Bungeecord)
/// may pick entity IDs per-player, so you should avoid relying on them for
/// identifying IDs (especially if you're using a shared world -- i.e. a swarm).
///
/// You might find [`Entity`] more useful, since that's an ID decided by us that
/// is likely to be correct across shared worlds. You could also use the
/// `EntityUuid` from `azalea_entity`, that one is unlikely to change even
/// across server restarts.
///
/// This serializes as a i32. Usually it's a VarInt in the protocol, but not
/// always. If you do need it to serialize as a VarInt, make sure to use use the
/// `#[var]` attribute.
///
/// [`Entity`]: bevy_ecs::entity::Entity
#[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
#[cfg_attr(feature = "bevy_ecs", derive(bevy_ecs::component::Component))]
#[derive(Clone, Copy, Debug, Default, Deref, DerefMut, Eq, PartialEq)]
pub struct MinecraftEntityId(pub i32);
impl Hash for MinecraftEntityId {
fn hash<H: Hasher>(&self, hasher: &mut H) {
hasher.write_i32(self.0);
}
}
impl nohash_hasher::IsEnabled for MinecraftEntityId {}
// we can't have the default be #[var] because mojang doesn't use varints for
// entities sometimes :(
impl AzBuf for MinecraftEntityId {
fn azalea_read(buf: &mut Cursor<&[u8]>) -> Result<Self, BufReadError> {
i32::azalea_read(buf).map(MinecraftEntityId)
}
fn azalea_write(&self, buf: &mut impl io::Write) -> io::Result<()> {
i32::azalea_write(&self.0, buf)
}
}
impl AzBufVar for MinecraftEntityId {
fn azalea_read_var(buf: &mut Cursor<&[u8]>) -> Result<Self, BufReadError> {
i32::azalea_read_var(buf).map(MinecraftEntityId)
}
fn azalea_write_var(&self, buf: &mut impl io::Write) -> io::Result<()> {
i32::azalea_write_var(&self.0, buf)
}
}
impl Display for MinecraftEntityId {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "eid({})", self.0)
}
}
impl From<i32> for MinecraftEntityId {
fn from(id: i32) -> Self {
Self(id)
}
}
impl From<u32> for MinecraftEntityId {
fn from(id: u32) -> Self {
Self(id as i32)
}
}
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