From 90ad8c0c33b519d5830c69d4128bdc984b5e9de8 Mon Sep 17 00:00:00 2001
From: historia <[not public]>
Date: Mon, 5 Oct 2026 14:22:14 -0400
Subject: feat: cryptocurrency exchange added to casino

---
 internal/game/cmd_bank.go | 30 +++++++++++++++++++++++++-----
 1 file changed, 25 insertions(+), 5 deletions(-)

(limited to 'internal/game/cmd_bank.go')

diff --git a/internal/game/cmd_bank.go b/internal/game/cmd_bank.go
index deddf0b..15ce85f 100644
--- a/internal/game/cmd_bank.go
+++ b/internal/game/cmd_bank.go
@@ -102,6 +102,9 @@ func (g *Game) showBankBrowse(sess *net.Session) {
 		entries = append(entries, bankEntry{slot: i, pos: len(entries) + 1, name: itemName, id: slot.ItemID, qty: slot.Quantity})
 	}
 
+	if p.Crypto.Balance < 0 {
+		sess.WriteLine(g.colorize(sess, "casino_result_loss", fmt.Sprintf("Crypto Exchange debt: %d credits. Future credit deposits repay this first.", -p.Crypto.Balance)))
+	}
 	if len(entries) == 0 && p.BankedCredits <= 0 {
 		sess.WriteLine("Your bank is empty.")
 		return
@@ -372,13 +375,26 @@ func (g *Game) doBankDepositCredits(sess *net.Session, parts []string) {
 		sess.WriteLine("You don't have that many credits.")
 		return
 	}
-	creditsBefore, bankedBefore := p.Credits, p.BankedCredits
-	p.Credits -= amount
-	p.BankedCredits += amount
-	if !g.persistBankCredits(p, creditsBefore, bankedBefore) {
+	var seized int64
+	if err := g.cryptoTransaction(p, func() error {
+		// Seize from the incoming deposit before the bank cap check. This also
+		// permits repayment when the bank itself is already at the balance cap.
+		seized = min(int64(amount), max(int64(0), -p.Crypto.Balance))
+		bank, err := addCreditsChecked(p.BankedCredits, amount-int(seized))
+		if err != nil {
+			return err
+		}
+		p.Credits -= amount
+		p.BankedCredits = bank
+		p.Crypto.Balance += seized
+		return nil
+	}); err != nil {
 		sess.WriteLine("The bank terminal could not record the transfer; nothing was moved.")
 		return
 	}
+	if seized > 0 {
+		sess.WriteLine(fmt.Sprintf("The Crypto Exchange seized %d deposited credits to repay debt.", seized))
+	}
 	sess.WriteLine(g.colorize(sess, "currency_pickup", fmt.Sprintf("You deposit %s credits. (Banked: %s)", formatInt(amount), formatInt(p.BankedCredits))))
 	g.showBankBrowse(sess)
 }
@@ -394,6 +410,10 @@ func (g *Game) doBankWithdrawCredits(sess *net.Session, parts []string) {
 		sess.WriteLine("Invalid amount.")
 		return
 	}
+	if p.Crypto.Balance < 0 {
+		sess.WriteLine("Your bank credits are subject to Crypto Exchange debt. Repay the debt before withdrawing.")
+		return
+	}
 	if p.BankedCredits < amount {
 		sess.WriteLine("You don't have that many banked credits.")
 		return
@@ -421,7 +441,7 @@ func (g *Game) doBankWithdrawCredits(sess *net.Session, parts []string) {
 // a wager taken from that phantom balance would be charged against money the
 // player does not durably have. Reports whether the move may be announced.
 func (g *Game) persistBankCredits(p *player.Player, creditsBefore, bankedBefore int) bool {
-	if err := g.AccountStore.SaveCharacter(p); err != nil {
+	if err := (casinoWallet{g: g, p: p}).save("bank credit transfer"); err != nil {
 		log.Printf("bank credit transfer %s: %v", p.Name, err)
 		p.Credits = creditsBefore
 		p.BankedCredits = bankedBefore
-- 
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