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use std::cmp;
use specs::{prelude::*, System};
use crate::{actions::Action, engine::components::UnitComponent, unit::UnitType, Player, Warrior};
pub struct PlayerSystem {
pub player: Box<dyn Player + Send + Sync>,
}
impl PlayerSystem {
pub fn new(player: impl Player + Send + Sync + 'static) -> PlayerSystem {
PlayerSystem {
player: Box::new(player),
}
}
}
impl<'a> System<'a> for PlayerSystem {
type SystemData = (Entities<'a>, WriteStorage<'a, UnitComponent>);
fn run(&mut self, (entities, mut units): Self::SystemData) {
let mut all_units = (&entities, &mut units).join();
let warrior_unit = all_units
.find(|(_, comp)| match comp.unit.unit_type {
UnitType::Warrior(_) => true,
_ => false,
})
.unwrap();
let (_, mut warrior_comp) = warrior_unit;
let mut other_units: Vec<(Entity, &mut UnitComponent)> = all_units
.by_ref()
.filter(|(_, comp)| match comp.unit.unit_type {
UnitType::Warrior(_) => false,
_ => true,
})
.collect();
let unit_in_range = {
let (wx, _) = warrior_comp.unit.position;
other_units.iter_mut().find(|(_, comp)| {
let (sx, _) = comp.unit.position;
(wx - sx).abs() == 1
})
};
let (path_clear, captive_found) = match unit_in_range {
Some((_, comp)) => (false, comp.unit.unit_type == UnitType::Captive),
None => (true, false),
};
let (health, _) = warrior_comp.unit.hp;
let mut warrior = Warrior::new(path_clear, captive_found, health);
self.player.play_turn(&mut warrior);
if let Some(action) = warrior.action {
match action {
Action::Walk => {
if path_clear {
println!("{:?} walks forward", warrior_comp.unit.unit_type);
let (x, y) = warrior_comp.unit.position;
warrior_comp.unit.position = (x + 1, y);
} else {
let (_, enemy_comp) = unit_in_range.unwrap();
println!(
"{warrior:?} bumps into {enemy:?}",
warrior = warrior_comp.unit.unit_type,
enemy = enemy_comp.unit.unit_type
);
}
}
Action::Attack => {
if path_clear {
println!("{:?} attacks and hits nothing", warrior_comp.unit.unit_type);
} else {
let (enemy_entity, enemy_comp) = unit_in_range.unwrap();
println!(
"{warrior:?} attacks {enemy:?}",
warrior = warrior_comp.unit.unit_type,
enemy = enemy_comp.unit.unit_type
);
let (current, max) = enemy_comp.unit.hp;
let remaining = cmp::max(current - warrior_comp.unit.atk, 0);
println!(
"{enemy:?} takes {atk} damage, {remaining} HP left",
enemy = enemy_comp.unit.unit_type,
atk = warrior_comp.unit.atk,
remaining = remaining
);
enemy_comp.unit.hp = (remaining, max);
if remaining == 0 {
println!("{:?} is dead!", enemy_comp.unit.unit_type);
entities.delete(*enemy_entity).unwrap();
}
}
}
Action::Rest => {
let (current, max) = warrior_comp.unit.hp;
if current < max {
let restored = if (current + 2) > max {
max - current
} else {
2
};
println!(
"{warrior:?} regains {restored} HP from resting! Now {remaining} left",
warrior = warrior_comp.unit.unit_type,
restored = restored,
remaining = current + restored
);
warrior_comp.unit.hp = (current + restored, max);
} else {
println!(
"{:?} rests but is already at max HP",
warrior_comp.unit.unit_type
);
};
}
Action::Rescue => {
if path_clear {
println!(
"{:?} tries to rescue someone, but nobody is here",
warrior_comp.unit.unit_type
);
} else if captive_found {
let (captive_entity, captive_comp) = unit_in_range.unwrap();
println!(
"{warrior:?} frees {captive:?} from their bindings",
warrior = warrior_comp.unit.unit_type,
captive = captive_comp.unit.unit_type
);
println!("{:?} escapes!", captive_comp.unit.unit_type);
entities.delete(*captive_entity).unwrap();
} else {
let (_, enemy_comp) = unit_in_range.unwrap();
println!(
"{warrior:?} tries to rescue {enemy:?}, but it is not a captive!",
warrior = warrior_comp.unit.unit_type,
enemy = enemy_comp.unit.unit_type
);
}
}
}
}
}
}