Add variable artifacts

src/artifacts.rs

@@ -1,16 +1,56 @@
 use crate::position::Position;
+use crate::player::Player;
 
-pub struct Artifact {
-    position: Position,
+pub trait Artifact {
+    //! An artifact that can be collected by the player
+    /// get the position of the artifact in the level
+    fn get_immutable_position(&self) -> &Position;
+    /// call to apply the effects of the artifact to the player
+    fn collect(&mut self, player: &mut Player);
 }
 
-impl Artifact {
+pub struct Chest {
+    /// a chest that contains some gold
+    position: Position,
+    gold: usize,
+}
+
+impl Chest {
     pub fn new(position: Position) -> Self {
-        Artifact {
+        Self {
             position,
+            gold: 10,
         }
     }
-    pub fn get_immutable_position(&self) -> &Position {
-        &self.position
+}
+
+impl Artifact for Chest {
+    fn get_immutable_position(&self) -> &Position { &self.position }
+    fn collect(&mut self, player: &mut Player) {
+        player.retrieve_gold(self.gold);
+        self.gold = 0;
     }
 }
+
+pub struct Potion {
+    /// a potion that restores some health
+    position: Position,
+    health: usize,
+}
+
+impl Potion {
+    pub fn new(position: Position) -> Self {
+        Self {
+            position,
+            health: 5,
+        }
+    }
+}
+
+impl Artifact for Potion {
+    fn get_immutable_position(&self) -> &Position { &self.position }
+    fn collect(&mut self, player: &mut Player) {
+        player.change_life(self.health.try_into().unwrap());
+        self.health = 0;
+    }
+}