add card count

src/game.rs

@@ -52,6 +52,9 @@ pub struct Game {
     shoe: Vec<Card>,
     /// Discard pile. When the shoe runs out, this gets mixed with the shoe and reshuffled.
     discard: Arc<RwLock<Vec<Card>>>,
+    /// The current card count, see: https://en.wikipedia.org/wiki/Blackjack#Card_counting
+    count: i16,
+
     hit_on_soft_17: bool,
 
     /// Returns when hitting blackjack
@@ -69,6 +72,7 @@ impl Game {
             rng: rand::rng(),
             shoe: Vec::new(),
             discard: Arc::new(RwLock::new(Vec::new())),
+            count: 0,
         }
     }
 
@@ -108,7 +112,7 @@ impl Game {
         player_decision: F,
     ) -> EndState
     where
-        F: Fn(&Hand, &Card) -> PlayerChoice,
+        F: Fn(&Hand, &Card, i16) -> PlayerChoice,
     {
         // Shuffle the deck if we've played over 75% of cards
         let discard_size = self.discard.read().unwrap().len();
@@ -148,7 +152,7 @@ impl Game {
 
         // Player turn
         loop {
-            let decision = player_decision(&player_hand, &dealer_hand.cards()[0]);
+            let decision = player_decision(&player_hand, &dealer_hand.cards()[0], self.count);
 
             match decision {
                 PlayerChoice::Stand => break,
@@ -226,7 +230,15 @@ impl Game {
 
     /// Deal a single card from the shoe
     fn deal(self: &mut Self) -> Card {
-        self.shoe.pop().unwrap()
+        let card = self.shoe.pop().unwrap();
+
+        if u8::from(&card) < 6 {
+            self.count += 1;
+        } else if u8::from(&card) >= 10 {
+            self.count -= 1;
+        }
+
+        card
     }
 
     /// Reset the shoe - combine shoe and discard and shuffle
@@ -235,5 +247,6 @@ impl Game {
         self.shoe.append(&mut discard);
         assert_eq!(discard.len(), 0);
         self.shoe.shuffle(&mut self.rng);
+        self.count = 0;
     }
 }

src/main.rs

@@ -16,7 +16,6 @@ fn main() {
 }
 
 fn interactive_play() {
-    // TODO: Persist bank between plays
     // TODO: Make a way to reset bank
     //
     let term = Term::stdout();
@@ -93,12 +92,13 @@ fn interactive_play() {
     }
 }
 
-fn interactive_decision(hand: &Hand, dealer_showing: &Card) -> PlayerChoice {
+fn interactive_decision(hand: &Hand, dealer_showing: &Card, _count: i16) -> PlayerChoice {
     let term = Term::stdout();
     term.clear_screen().unwrap();
 
     println!("Dealer showing: {dealer_showing}");
-    println!("Your hand: {hand}\n");
+    println!("Your hand: {hand}");
+    println!();
 
     if hand.value() == 21 {
         println!("You have 21, standing.");
@@ -127,7 +127,7 @@ fn interactive_decision(hand: &Hand, dealer_showing: &Card) -> PlayerChoice {
     choice
 }
 
-fn basic_strategy(hand: &Hand, dealer_showing: &Card) -> PlayerChoice {
+fn basic_strategy(hand: &Hand, dealer_showing: &Card, _count: i16) -> PlayerChoice {
     // Source: https://en.wikipedia.org/wiki/Blackjack#Basic_strategy
     let dv = u8::from(dealer_showing);
     let can_dd = hand.cards().len() == 2;