Add hunger

src/hunger_system.rs

@@ -0,0 +1,71 @@
+use specs::prelude::*;
+
+use crate::{GameLog, Heals, HungerClock, HungerState, ProvidesHealing, RunState, SufferDamage};
+use crate::spawner::player;
+
+pub struct HungerSystem {}
+
+impl<'a> System<'a> for HungerSystem {
+    type SystemData = (
+        Entities<'a>,
+        WriteStorage<'a, HungerClock>,
+        ReadExpect<'a, Entity>,
+        ReadExpect<'a, RunState>,
+        WriteStorage<'a, SufferDamage>,
+        WriteExpect<'a, GameLog>,
+        WriteStorage<'a, Heals>
+    );
+
+    fn run(&mut self, data: Self::SystemData) {
+        let (entities, mut hunger_clock, player_entity, run_state, mut suffer_damage, mut game_log, mut heals) = data;
+        for (entity, mut clock) in (&entities, &mut hunger_clock).join() {
+            let mut proceed = false;
+
+            match *run_state {
+                RunState::PlayerTurn => {
+                    if entity == *player_entity { proceed = true; } }
+                RunState::MonsterTurn => { if entity != *player_entity { proceed = true; } }
+                _ => { proceed = false; }
+            }
+
+            if !proceed {
+                continue;
+            }
+
+            clock.duration -= 1;
+            if clock.duration > 0 {
+                continue;
+            }
+
+            match clock.state {
+                HungerState::WellFed => {
+                    clock.state = HungerState::Normal;
+                    clock.duration = 200;
+                    if entity == *player_entity {
+                        game_log.entries.push("You are no longer well-feed".to_string())
+                    }
+                }
+                HungerState::Normal => {
+                    clock.state = HungerState::Hungry;
+                    clock.duration = 200;
+                    if entity == *player_entity {
+                        game_log.entries.push("You are hungry".to_string())
+                    }
+                }
+                HungerState::Hungry => {
+                    clock.state = HungerState::Starving;
+                    clock.duration = 200;
+                    if entity == *player_entity {
+                        game_log.entries.push("You are Starving!".to_string())
+                    }
+                }
+                HungerState::Starving => {
+                    if entity == *player_entity {
+                        game_log.entries.push("Your hunger pangs are getting painful".to_string())
+                    }
+                    SufferDamage::new_damage(&mut suffer_damage, entity, 1);
+                }
+            }
+        }
+    }
+}