use crate::common::{GearId, Millis};
use std::{
cmp::{Eq, Ord, Ordering, PartialEq, PartialOrd},
collections::BinaryHeap,
};
pub type EventId = u16;
struct TimeEvent {
time: Millis,
gear_id: GearId,
event_id: EventId,
}
impl PartialOrd for TimeEvent {
#[inline]
fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
self.time.partial_cmp(&other.time)
}
}
impl PartialEq for TimeEvent {
#[inline]
fn eq(&self, other: &Self) -> bool {
self.time.eq(&other.time)
}
}
impl Ord for TimeEvent {
#[inline]
fn cmp(&self, other: &Self) -> Ordering {
self.time.cmp(&other.time)
}
}
impl Eq for TimeEvent {}
pub struct OccurredEvents {
events: Vec<(GearId, EventId)>,
}
impl OccurredEvents {
fn new() -> Self {
Self { events: vec![] }
}
fn clear(&mut self) {
self.events.clear()
}
}
pub struct TimeProcessor {
current_event_id: EventId,
current_time: Millis,
events: BinaryHeap<TimeEvent>,
timeouts: OccurredEvents,
}
impl TimeProcessor {
pub fn new() -> Self {
Self {
current_event_id: 0,
current_time: Millis::new(0),
events: BinaryHeap::with_capacity(1024),
timeouts: OccurredEvents::new(),
}
}
pub fn register(&mut self, gear_id: GearId, timeout: Millis) -> EventId {
let event_id = self.current_event_id;
self.current_event_id.wrapping_add(1);
let event = TimeEvent {
time: self.current_time + timeout,
gear_id,
event_id,
};
self.events.push(event);
event_id
}
pub fn cancel(&mut self, gear_id: GearId) {}
pub fn process(&mut self, time_step: Millis) -> &OccurredEvents {
self.timeouts.clear();
self.current_time = self.current_time + time_step;
while self
.events
.peek()
.filter(|e| e.time <= self.current_time)
.is_some()
{
let event = self.events.pop().unwrap();
self.timeouts.events.push((event.gear_id, event.event_id))
}
&self.timeouts
}
}