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use std::collections::HashSet;
use specs::{
WriteStorage,
ReadStorage,
Entities,
System,
Join,
Read
};
use crate::{
components::{Removed, Requirements, New, Position, Flag, Flags},
resources::{Ground, RoomFlags}
};
pub struct SpawnCheck;
impl <'a> System<'a> for SpawnCheck {
type SystemData = (
Entities<'a>,
ReadStorage<'a, Requirements>,
ReadStorage<'a, New>,
WriteStorage<'a, Removed>,
Read<'a, Ground>,
Read<'a, RoomFlags>,
ReadStorage<'a, Position>,
ReadStorage<'a, Flags>
);
fn run(&mut self, (entities, requirements, new, mut removeds, ground, roomflags, positions, flags): Self::SystemData) {
for (entity, requirements, _new, position) in (&entities, &requirements, &new, &positions).join() {
let ground_flags: HashSet<Flag> = ground.flags_on(position.pos, &flags).union(&roomflags.0).cloned().collect();
if !(requirements.required_flags.is_subset(&ground_flags) && requirements.blocking_flags.is_disjoint(&ground_flags)){
removeds.insert(entity, Removed).unwrap();
}
}
}
}
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