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use rand;
use specs::{
ReadStorage,
WriteStorage,
Entities,
System,
Join,
Write,
Read
};
use crate::{
components::{
Position,
Grow,
Removed,
CreationTime
},
resources::{NewEntities, Time},
componentwrapper::ComponentWrapper
};
pub struct Growth;
impl <'a> System<'a> for Growth{
type SystemData = (
Entities<'a>,
ReadStorage<'a, Position>,
Write<'a, NewEntities>,
WriteStorage<'a, Grow>,
WriteStorage<'a, Removed>,
Read<'a, Time>,
ReadStorage<'a, CreationTime>
);
fn run(&mut self, (entities, positions, mut new, mut grows, mut removeds, time, creation_times): Self::SystemData) {
for (entity, position, grow) in (&entities, &positions, &mut grows).join(){
let creation_time = creation_times.get(entity).map(|ct| ct.time).unwrap_or(time.time);
if grow.target_time == None {
let duration = grow.delay as f64 * (1.0 + rand::random::<f64>()) / (if rand::random() {1.0} else {2.0});
grow.target_time = Some(creation_time + duration as i64);
}
let target_time = grow.target_time.unwrap();
if target_time <= time.time {
removeds.insert(entity, Removed).unwrap();
// todo: error handling
let mut preent = new.encyclopedia.construct(&grow.into).unwrap();
preent.push(ComponentWrapper::CreationTime(CreationTime{time: target_time + 1}));
new.to_build.push((position.pos, preent));
}
}
}
}
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