chore: Remove old Anhang and add some code to the docs

projektdokumentation/Listings/CoinflipService.java

@@ -0,0 +1,35 @@
+package de.szut.casino.coinflip;
+
+import de.szut.casino.shared.service.BalanceService;
+import de.szut.casino.user.UserEntity;
+import org.springframework.stereotype.Service;
+
+import java.math.BigDecimal;
+import java.util.Random;
+
+@Service
+public class CoinflipService {
+    private final Random random;
+    private final BalanceService balanceService;
+
+    public CoinflipService(BalanceService balanceService, Random random) {
+        this.balanceService = balanceService;
+        this.random = random;
+    }
+
+    public CoinflipResult play(UserEntity user, CoinflipDto coinflipDto) {
+        this.balanceService.subtractFunds(user, coinflipDto.getBetAmount());
+
+        CoinSide coinSide = this.random.nextBoolean() ? CoinSide.HEAD : CoinSide.TAILS;
+        CoinflipResult coinflipResult = new CoinflipResult(false, BigDecimal.ZERO, coinSide);
+        if (coinSide == coinflipDto.getCoinSide()) {
+            coinflipResult.setWin(true);
+
+            BigDecimal payout = coinflipDto.getBetAmount().multiply(BigDecimal.TWO);
+            this.balanceService.addFunds(user, payout);
+            coinflipResult.setPayout(payout);
+        }
+
+        return coinflipResult;
+    }
+}