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;
+    }
+}

src/level.rs

@@ -1,5 +1,5 @@
 use std::cmp::{max, min};
-use crate::artifacts::Artifact;
+use crate::artifacts::{Artifact, Chest, Potion};
 use crate::monster::Monster;
 use crate::position::Position;
 
@@ -20,7 +20,7 @@ pub struct Level {
     structure: [[StructureElement; LEVEL_HEIGHT]; LEVEL_WIDTH],
     discovered: [[bool; LEVEL_HEIGHT]; LEVEL_WIDTH],
     monsters: Vec<Monster>,
-    artifacts: Vec<Artifact>,
+    artifacts: Vec<Box<dyn Artifact>>,
 }
 
 impl Level {
@@ -39,7 +39,7 @@ impl Level {
             artifacts: Vec::with_capacity(10),
         }
     }
-    pub fn get_element(&mut self, x: i16, y: i16) -> (Option<StructureElement>, Option<&mut Monster>, Option<&mut Artifact>) {
+    pub fn get_element(&mut self, x: i16, y: i16) -> (Option<StructureElement>, Option<&mut Monster>, Option<&mut Box<(dyn Artifact + 'static)>>) {
         if x < 0 || y < 0 {
             return (None, None, None);
         }
@@ -58,7 +58,7 @@ impl Level {
                 res_m = Some(m);
             }
         }
-        let mut res_a: Option<&mut Artifact> = None;
+        let mut res_a: Option<&mut Box<dyn Artifact>> = None;
         for a in &mut self.artifacts {
             if a.get_immutable_position() == search_pos {
                 res_a = Some(a);
@@ -94,7 +94,7 @@ impl Level {
         }
         Ok(())
     }
-    pub fn add_artifact(&mut self, mut artifact: Artifact) -> Result<(), String> {
+    pub fn add_artifact(&mut self, artifact: impl Artifact + 'static) -> Result<(), String> {
         if self.level != artifact.get_immutable_position().get_level() {
             return Err("Wrong Level".to_string());
         }
@@ -103,7 +103,7 @@ impl Level {
                 return Err("Position already used".to_string());
             }
         }
-        self.artifacts.push(artifact);
+        self.artifacts.push(Box::new(artifact));
         Ok(())
     }
     pub fn remove_artifact(&mut self, position: &Position) -> Result<(), String> {
@@ -209,16 +209,16 @@ fn test_discover_can_add_monster() {
 #[test]
 fn test_discover_can_add_artifact() {
     let mut l = Level::new(0);
-    let a = Artifact::new(Position::new(1, 2, 3));
+    let a = Chest::new(Position::new(1, 2, 3));
     assert_eq!(l.add_artifact(a), Err("Wrong Level".to_string()));
 
-    let a = Artifact::new(Position::new(0, 2, 3));
+    let a = Chest::new(Position::new(0, 2, 3));
     assert_eq!(l.add_artifact(a), Ok(()));
 
-    let a = Artifact::new(Position::new(0, 2, 3));
+    let a = Potion::new(Position::new(0, 2, 3));
     assert_eq!(l.add_artifact(a), Err("Position already used".to_string()));
 
-    let a = Artifact::new(Position::new(0, 1, 3));
+    let a = Chest::new(Position::new(0, 1, 3));
     assert_eq!(l.add_artifact(a), Ok(()));
 }
 
@@ -252,13 +252,12 @@ fn test_discover_get_artifact() {
     assert_eq!(l.get_element(10, 10).0.unwrap(), StructureElement::Floor);
     assert!(l.get_element(10, 10).2.is_none());
 
-    let a = Artifact::new(Position::new(0, 10, 10));
+    let a = Chest::new(Position::new(0, 10, 10));
     assert_eq!(l.add_artifact(a), Ok(()));
 
     let elem = l.get_element(10, 10);
     assert_eq!(elem.0.unwrap(), StructureElement::Floor);
     assert!(elem.2.is_some());
-    let a = elem.2.unwrap();
 }
 
 #[test]