Fix critical game bugs: payout, sessions, balance type, render_lines; add AGENTS.md and regression tests

1 files changed, 10 insertions, 11 deletions

diff --git a/src/bin/server/games/slots.rs b/src/bin/server/games/slots.rs
index d84e21f..3d285ef 100644
--- a/src/bin/server/games/slots.rs
+++ b/src/bin/server/games/slots.rs
@@ -36,23 +36,25 @@ impl SlotsGame {
             .collect()
     }
 
-    fn calculate_payout(&self, reels: &[char], bet: u64) -> u64 {
+    pub fn calculate_payout(&self, reels: &[char], bet: u64) -> u64 {
         let reel_string: String = reels.iter().collect();
 
         if let Some(&multiplier) = self.payouts.get(&reel_string) {
             return bet * multiplier;
         }
 
-        for i in 0..2 {
-            if reels[i] == reels[i + 1] {
-                let two_of_kind = format!("{}{}", reels[i], reels[i]);
+        // Check all three pairs including non-adjacent (e.g. [C,D,C])
+        let pairs: [(usize, usize); 3] = [(0, 1), (1, 2), (0, 2)];
+        let mut best: u64 = 0;
+        for &(a, b) in &pairs {
+            if reels[a] == reels[b] {
+                let two_of_kind = format!("{}{}", reels[a], reels[a]);
                 if let Some(&multiplier) = self.payouts.get(&two_of_kind) {
-                    return bet * multiplier;
+                    best = best.max(bet * multiplier);
                 }
             }
         }
-
-        0
+        best
     }
 }
 
@@ -108,11 +110,8 @@ impl Game for SlotsGame {
                 new_data.insert("reels".to_string(), reel_string.clone());
                 new_data.insert("status".to_string(), "spun".to_string());
 
-                let winnings = self.calculate_payout(&reels, state.bet_amount);
-                new_data.insert("winnings".to_string(), winnings.to_string());
-
                 let is_jackpot = reels[0] == reels[1] && reels[1] == reels[2];
-                let is_two = reels[0] == reels[1] || reels[1] == reels[2];
+                let is_two = reels[0] == reels[1] || reels[1] == reels[2] || reels[0] == reels[2];
                 new_data.insert(
                     "win_type".to_string(),
                     if is_jackpot {