EncumbranceSystem {}

src/ai/encumbrance_system.rs

@@ -0,0 +1,84 @@
+use crate::{gamelog, Attributes, Burden, EquipmentChanged, Equipped, InBackpack, Item, Pools};
+use rltk::prelude::*;
+use specs::prelude::*;
+use std::collections::HashMap;
+
+pub struct EncumbranceSystem {}
+
+impl<'a> System<'a> for EncumbranceSystem {
+    #[allow(clippy::type_complexity)]
+    type SystemData = (
+        WriteStorage<'a, EquipmentChanged>,
+        Entities<'a>,
+        ReadStorage<'a, Item>,
+        ReadStorage<'a, InBackpack>,
+        ReadStorage<'a, Equipped>,
+        WriteStorage<'a, Pools>,
+        ReadStorage<'a, Attributes>,
+        ReadExpect<'a, Entity>,
+        WriteStorage<'a, Burden>,
+    );
+
+    fn run(&mut self, data: Self::SystemData) {
+        let (mut equip_dirty, entities, items, backpacks, wielded, mut pools, attributes, player, mut burdened) = data;
+        if equip_dirty.is_empty() {
+            return;
+        }
+        // Build update map
+        let mut to_update: HashMap<Entity, f32> = HashMap::new();
+        for (entity, _dirty) in (&entities, &equip_dirty).join() {
+            to_update.insert(entity, 0.0);
+        }
+        equip_dirty.clear();
+        // Total up equipped items
+        for (item, equipped) in (&items, &wielded).join() {
+            if to_update.contains_key(&equipped.owner) {
+                let totals = to_update.get_mut(&equipped.owner).unwrap();
+                *totals += item.weight;
+            }
+        }
+        // Total carried items
+        for (item, carried) in (&items, &backpacks).join() {
+            if to_update.contains_key(&carried.owner) {
+                let totals = to_update.get_mut(&carried.owner).unwrap();
+                *totals += item.weight;
+            }
+        }
+        // Apply to pools
+        for (entity, weight) in to_update.iter() {
+            if let Some(pool) = pools.get_mut(*entity) {
+                pool.weight = *weight;
+                if let Some(attr) = attributes.get(*entity) {
+                    let carry_capacity_lbs = (attr.strength.base + attr.strength.modifiers) * 10;
+                    if pool.weight as i32 > 3 * carry_capacity_lbs {
+                        // Overloaded
+                        burdened
+                            .insert(*entity, Burden { level: crate::BurdenLevel::Overloaded })
+                            .expect("Failed to insert Burden");
+                        if *entity == *player {
+                            gamelog::Logger::new().append("You're overloaded!").log();
+                        }
+                    } else if pool.weight as i32 > 2 * carry_capacity_lbs {
+                        // Strained
+                        burdened
+                            .insert(*entity, Burden { level: crate::BurdenLevel::Strained })
+                            .expect("Failed to insert Burden");
+                        if *entity == *player {
+                            gamelog::Logger::new().append("You're strained.").log();
+                        }
+                    } else if pool.weight as i32 > carry_capacity_lbs {
+                        // Burdened
+                        burdened
+                            .insert(*entity, Burden { level: crate::BurdenLevel::Burdened })
+                            .expect("Failed to insert Burden");
+                        if *entity == *player {
+                            gamelog::Logger::new().append("You're burdened.").log();
+                        }
+                    } else {
+                        burdened.remove(*entity);
+                    }
+                }
+            }
+        }
+    }
+}