1 files changed, 45 insertions, 0 deletions
diff --git a/src/exchange.rs b/src/exchange.rs
new file mode 100644
index 0000000..5e87ef2
--- /dev/null
+++ b/src/exchange.rs
@@ -0,0 +1,45 @@
+
+use crate::{
+	components::Inventory,
+	ItemId,
+	Encyclopedia
+};
+
+#[derive(Debug, Clone, PartialEq)]
+pub struct Exchange {
+	pub cost: Vec<ItemId>,
+	pub offer: Vec<ItemId>
+}
+
+impl Exchange {
+	pub fn show(&self) -> String {
+		format!(
+			"offer: [{}], price: [{}]",
+			self.offer.iter().map(|i| i.0.clone()).collect::<Vec<String>>().join(", "),
+			self.cost.iter().map(|i| i.0.clone()).collect::<Vec<String>>().join(", ")
+		)
+	}
+	
+	pub fn can_trade(&self, inventory: &Inventory) -> bool {
+		if self.offer.len() as isize - self.cost.len() as isize > inventory.capacity as isize - inventory.items.len() as isize{
+			return false;
+		}
+		let mut costs = self.cost.clone();
+		for entry in inventory.items.iter() {
+			if let Some(pos) = costs.iter().position(|x| *x == entry.itemid){
+				costs.remove(pos);
+			}
+		}
+		costs.is_empty()
+	}
+	
+	pub fn trade(&self, inventory: &mut Inventory, enc: &Encyclopedia) {
+		for item in self.cost.iter() {
+			let pos = inventory.items.iter().position(|entry| entry.itemid == item.clone()).unwrap();
+			inventory.items.remove(pos);
+		}
+		for item in self.offer.iter() {
+			inventory.add_item(item.clone(), enc);
+		}
+	}
+}