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src/card.rs

@@ -11,7 +11,12 @@ pub struct Card {
 
 impl Card {
     pub fn fight(&self, other: &Card) -> FightResult {
-        todo!()
+        match (self.damage >= other.health, other.damage >= self.health) {
+            (true, true) => FightResult::Tie,
+            (true, false) => FightResult::Win,
+            (false, true) => FightResult::Loss,
+            (false, false) => FightResult::Draw,
+        }
     }
 
     /// Give a play by play of the battle

src/main.rs

@@ -10,7 +10,10 @@ mod shop;
 mod strings;
 
 pub enum FightResult {
-    // TODO: Add variants for win, loss, tie, and draw
+    Win,
+    Loss,
+    Tie,
+    Draw,
 }
 
 fn main() {

src/shop.rs

@@ -26,7 +26,24 @@ impl Shop {
     /// this store wins, FightResult::Loss if this store loses, and a
     /// FightResult::Tie if both stores win the same number of battles.
     pub fn fight_store(&self, other: &Shop) -> FightResult {
-        todo!()
+        let mut this_store_wins = 0;
+        let mut other_store_wins = 0;
+
+        for card1 in &self.cards {
+            for card2 in &other.cards {
+                match card1.fight(card2) {
+                    FightResult::Win => this_store_wins += 1,
+                    FightResult::Loss => other_store_wins += 1,
+                    _ => {}
+                }
+            }
+        }
+
+        match this_store_wins.cmp(&other_store_wins) {
+            std::cmp::Ordering::Greater => FightResult::Win,
+            std::cmp::Ordering::Less => FightResult::Loss,
+            std::cmp::Ordering::Equal => FightResult::Tie,
+        }
     }
 }