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use std::any::{Any, TypeId};
use std::hash::{BuildHasher, Hash};
use bevy::ecs::system::{EntityCommands, SystemParam};
use bevy::prelude::*;
use bevy::utils::HashMap;
use crate::editor::YoleckPassedData;
use crate::BoxedArc;
#[doc(hidden)]
#[derive(Default, Resource)]
pub struct YoleckKnobsCache {
by_key_hash: HashMap<u64, Vec<CachedKnob>>,
}
#[doc(hidden)]
#[derive(Component)]
pub struct YoleckKnobMarker;
struct CachedKnob {
key: Box<dyn Send + Sync + Any>,
entity: Entity,
keep_alive: bool,
}
impl YoleckKnobsCache {
pub fn access<'a, K>(&mut self, key: K, commands: &'a mut Commands) -> KnobFromCache<'a>
where
K: 'static + Send + Sync + Hash + Eq,
{
let entries = self
.by_key_hash
.entry(self.by_key_hash.hasher().hash_one(&key))
.or_default();
for entry in entries.iter_mut() {
if let Some(cached_key) = entry.key.downcast_ref::<K>() {
if key == *cached_key {
entry.keep_alive = true;
return KnobFromCache {
cmd: commands.entity(entry.entity),
is_new: false,
};
}
}
}
let cmd = commands.spawn(YoleckKnobMarker);
entries.push(CachedKnob {
key: Box::new(key),
entity: cmd.id(),
keep_alive: true,
});
KnobFromCache { cmd, is_new: true }
}
pub fn clean_untouched(&mut self, mut clean_func: impl FnMut(Entity)) {
self.by_key_hash.retain(|_, entries| {
entries.retain_mut(|entry| {
if entry.keep_alive {
entry.keep_alive = false;
true
} else {
clean_func(entry.entity);
false
}
});
!entries.is_empty()
});
}
pub fn drain(&mut self) -> impl '_ + Iterator<Item = Entity> {
self.by_key_hash
.drain()
.flat_map(|(_, entries)| entries.into_iter().map(|entry| entry.entity))
}
}
pub struct KnobFromCache<'a> {
pub cmd: EntityCommands<'a>,
pub is_new: bool,
}
/// An handle for intearcing with a knob from an edit system.
pub struct YoleckKnobHandle<'a> {
/// The command of the knob entity.
pub cmd: EntityCommands<'a>,
/// `true` if the knob entity is just created this frame.
pub is_new: bool,
passed: HashMap<TypeId, BoxedArc>,
}
impl YoleckKnobHandle<'_> {
/// Get data sent to the knob from external systems (usually interaciton from the level
/// editor)
///
/// The data is sent using [a directive event](crate::YoleckDirective::pass_to_entity).
///
/// ```no_run
/// # use bevy::prelude::*;
/// # use bevy_yoleck::prelude::*;;
/// # use bevy_yoleck::vpeol::YoleckKnobClick;
/// # #[derive(Component)]
/// # struct Example {
/// # num_clicks_on_knob: usize,
/// # };
/// fn edit_example_with_knob(mut edit: YoleckEdit<&mut Example>, mut knobs: YoleckKnobs) {
/// let Ok(mut example) = edit.get_single_mut() else { return };
/// let mut knob = knobs.knob("click-counting");
/// knob.cmd.insert((
/// // setup the knobs position and graphics
/// ));
/// if knob.get_passed_data::<YoleckKnobClick>().is_some() {
/// example.num_clicks_on_knob += 1;
/// }
/// }
/// ```
pub fn get_passed_data<T: 'static>(&self) -> Option<&T> {
if let Some(dynamic) = self.passed.get(&TypeId::of::<T>()) {
dynamic.downcast_ref()
} else {
None
}
}
}
#[derive(SystemParam)]
pub struct YoleckKnobs<'w, 's> {
knobs_cache: ResMut<'w, YoleckKnobsCache>,
commands: Commands<'w, 's>,
passed_data: Res<'w, YoleckPassedData>,
}
impl<'w, 's> YoleckKnobs<'w, 's> {
pub fn knob<K>(&mut self, key: K) -> YoleckKnobHandle
where
K: 'static + Send + Sync + Hash + Eq,
{
let KnobFromCache { cmd, is_new } = self.knobs_cache.access(key, &mut self.commands);
let passed = self
.passed_data
.0
.get(&cmd.id())
// TODO: find a way to do this with the borrow checker, without cloning
.cloned()
.unwrap_or_default();
YoleckKnobHandle {
cmd,
is_new,
passed,
}
}
}