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use crate::components::{FinalTag, MultiEdge, OnCompletion, SingleEdge, TaskProgress};
use log::debug;
use specs::prelude::*;
#[derive(SystemData)]
pub struct TaskManager<'a> {
entities: Entities<'a>,
progress: WriteStorage<'a, TaskProgress>,
single_edges: ReadStorage<'a, SingleEdge>,
multi_edges: ReadStorage<'a, MultiEdge>,
}
impl TaskManager<'_> {
pub fn task_is_complete(&self, entity: Entity) -> bool {
if let Some(progress) = self.progress.get(entity) {
progress.is_complete()
} else {
false
}
}
fn fork_is_complete(&self, multi_children: &[Entity]) -> bool {
for child in multi_children.iter() {
if !self.entity_is_complete(*child) {
return false;
}
}
true
}
pub fn entity_is_complete(&self, entity: Entity) -> bool {
if let Some(MultiEdge { children }) = self.multi_edges.get(entity) {
self.fork_is_complete(&children)
} else {
self.task_is_complete(entity)
}
}
pub fn count_tasks_in_progress(&self) -> usize {
(&self.progress).join().count()
}
pub fn delete_descendents(&self, entity: Entity) {
if let Some(MultiEdge { children }) = self.multi_edges.get(entity) {
for child in children.iter() {
self.delete_entity_and_descendents(*child);
}
}
if let Some(SingleEdge { child }) = self.single_edges.get(entity) {
self.delete_entity_and_descendents(*child);
}
}
pub fn delete_entity_and_descendents(&self, entity: Entity) {
if !self.entities.is_alive(entity) {
return;
}
self.delete_descendents(entity);
debug!("Deleting {:?}", entity);
self.entities.delete(entity).unwrap();
}
fn maintain_task_and_descendents(&mut self, entity: Entity) -> bool {
let (is_unblocked, is_complete) = if let Some(progress) = self.progress.get(entity) {
(progress.is_unblocked, progress.is_complete())
} else {
return true;
};
if is_complete {
debug!(
"Noticed task {:?} is complete, removing TaskProgress",
entity
);
return true;
}
if is_unblocked {
return false;
}
let mut child_complete = true;
if let Some(SingleEdge { child }) = self.single_edges.get(entity).cloned() {
child_complete = self.maintain_entity_and_descendents(child);
}
if child_complete {
debug!("Unblocking task {:?}", entity);
let progress = self
.progress
.get_mut(entity)
.expect("Blocked task must have progress");
progress.unblock();
}
false
}
fn maintain_fork_and_descendents(
&mut self,
entity: Entity,
multi_edge_children: &[Entity],
) -> bool {
let mut single_child_complete = true;
if let Some(SingleEdge { child }) = self.single_edges.get(entity).cloned() {
single_child_complete = self.maintain_entity_and_descendents(child);
}
let mut multi_children_complete = true;
if single_child_complete {
for child in multi_edge_children.iter() {
multi_children_complete &= self.maintain_entity_and_descendents(*child);
}
}
single_child_complete && multi_children_complete
}
fn maintain_entity_and_descendents(&mut self, entity: Entity) -> bool {
if let Some(MultiEdge { children }) = self.multi_edges.get(entity).cloned() {
self.maintain_fork_and_descendents(entity, &children)
} else {
self.maintain_task_and_descendents(entity)
}
}
}
pub struct TaskManagerSystem;
impl<'a> System<'a> for TaskManagerSystem {
type SystemData = (TaskManager<'a>, WriteStorage<'a, FinalTag>);
fn run(&mut self, (mut task_man, mut finalized): Self::SystemData) {
let final_ents: Vec<(Entity, FinalTag)> = (&task_man.entities, &finalized)
.join()
.map(|(e, f)| (e, *f))
.collect();
for (entity, FinalTag { on_completion }) in final_ents.into_iter() {
let final_complete = task_man.maintain_entity_and_descendents(entity);
if final_complete {
match on_completion {
OnCompletion::Delete => {
task_man.delete_entity_and_descendents(entity);
}
OnCompletion::DeleteDescendents => {
task_man.delete_descendents(entity);
}
OnCompletion::None => {
debug!("Removing FinalTag from {:?}", entity);
finalized.remove(entity);
}
}
}
}
}
}