it is now possible to use items

1 files changed, 57 insertions, 0 deletions

diff --git a/src/systems/useitem.rs b/src/systems/useitem.rs
new file mode 100644
index 0000000..d77239c
--- /dev/null
+++ b/src/systems/useitem.rs
@@ -0,0 +1,57 @@
+
+
+use specs::{
+	ReadStorage,
+	WriteStorage,
+	System,
+	Join,
+	Write
+};
+
+use crate::components::{
+	Controller,
+	Position,
+	Inventory,
+	Health
+};
+
+use crate::resources::{NewEntities};
+use crate::components::item::ItemAction::{None, Build, Eat};
+use crate::controls::Control;
+
+
+pub struct Use;
+impl <'a> System<'a> for Use {
+	type SystemData = (
+		ReadStorage<'a, Controller>,
+		WriteStorage<'a, Position>,
+		WriteStorage<'a, Inventory>,
+		Write<'a, NewEntities>,
+		WriteStorage<'a, Health>
+	);
+	
+	fn run(&mut self, (controllers, positions, mut inventories, mut new, mut healths): Self::SystemData) {
+		for (controller, position, inventory, maybe_health) in (&controllers, &positions, &mut inventories, (&mut healths).maybe()).join(){
+			match &controller.0 {
+				Control::Use(rank) => {
+					if let Some(item) = inventory.items.get(*rank) {
+						match &item.action {
+							Build(template) => {
+								let _ = new.create(position.pos, template.clone());
+								inventory.items.remove(*rank);
+							}
+							Eat(health_diff) => {
+								if let Some(health) = maybe_health {
+									health.heal(*health_diff);
+								}
+								inventory.items.remove(*rank);
+							}
+							None => {}
+						}
+					}
+				}
+				_ => {}
+			}
+		}
+	}
+}