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use crate::display::Draw;
use crate::entities::EntityID;
use crate::types::{Positioned, PositionedMut};
use downcast_rs::Downcast;
use std::fmt::Debug;
use std::io::{self, Write};
pub trait Identified<ID>: Debug {
fn opt_id(&self) -> Option<ID>;
fn set_id(&mut self, id: ID);
fn id(&self) -> ID {
self.opt_id()
.expect(format!("Entity ({:?}) is not in the game", self).as_str())
}
}
impl<'a, A, ID> Identified<ID> for &'a mut A
where
A: Identified<ID>,
{
fn opt_id(&self) -> Option<ID> {
(**self).opt_id()
}
fn set_id(&mut self, id: ID) {
(**self).set_id(id);
}
}
impl<ID, A: Identified<ID>> Identified<ID> for Box<A> {
fn opt_id(&self) -> Option<ID> {
(**self).opt_id()
}
fn set_id(&mut self, id: ID) {
(**self).set_id(id);
}
}
pub trait Entity:
Positioned + PositionedMut + Identified<EntityID> + Draw + Downcast
{
}
impl Identified<EntityID> for Box<dyn Entity> {
fn opt_id(&self) -> Option<EntityID> {
(**self).opt_id()
}
fn set_id(&mut self, id: EntityID) {
(**self).set_id(id);
}
}
#[macro_export]
macro_rules! identified {
($name: ident, $typ: ident) => {
identified!($name, $typ, id);
};
($name: ident, $typ: ident, $attr: ident) => {
impl crate::entities::entity::Identified<$typ> for $name {
fn opt_id(&self) -> Option<$typ> {
self.$attr
}
fn set_id(&mut self, id: $typ) {
self.$attr = Some(id)
}
}
};
}
#[macro_export]
macro_rules! entity {
($name: ident) => {
positioned!($name);
positioned_mut!($name);
identified!($name, EntityID);
impl crate::entities::entity::Entity for $name {}
};
}
impl_downcast!(Entity);
impl Draw for Box<dyn Entity> {
fn do_draw(&self, out: &mut Write) -> io::Result<()> {
(**self).do_draw(out)
}
}
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