Merge pull request 'feat: Create api routes for lootboxes (CAS-43)' (!110) from feat/lootboxes into main

Reviewed-on: #110
Reviewed-by: Jan K9f <jan@kjan.email>
Reviewed-by: lziemke <lea.z4@schule.bremen.de>

backend/requests/lootboxes.http

@@ -0,0 +1,9 @@
+GET http://localhost:8080/lootboxes
+Authorization: Bearer {{token}}
+Content-Type: application/json
+
+###
+
+POST http://localhost:8080/lootboxes/2
+Authorization: Bearer {{token}}
+Content-Type: application/json

backend/src/main/java/de/szut/casino/CasinoApplication.java

@@ -1,10 +1,20 @@
 package de.szut.casino;
 
+import de.szut.casino.lootboxes.LootBoxEntity;
+import de.szut.casino.lootboxes.LootBoxRepository;
+import de.szut.casino.lootboxes.RewardEntity;
+import de.szut.casino.lootboxes.RewardRepository;
+import org.springframework.boot.CommandLineRunner;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.context.annotation.Bean;
 import org.springframework.web.client.RestTemplate;
 
+import java.math.BigDecimal;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
 @SpringBootApplication
 public class CasinoApplication {
 
@@ -16,4 +26,65 @@ public class CasinoApplication {
     public static RestTemplate restTemplate() {
         return new RestTemplate();
     }
+
+    @Bean
+    public CommandLineRunner initData(LootBoxRepository lootBoxRepository, RewardRepository rewardRepository) {
+        return _ -> {
+            if (lootBoxRepository.count() == 0) {
+                LootBoxEntity basicLootBox = new LootBoxEntity();
+                basicLootBox.setName("Basic LootBox");
+                basicLootBox.setPrice(new BigDecimal("2"));
+                basicLootBox.setRewards(new ArrayList<>()); // Initialize the list
+
+                LootBoxEntity premiumLootBox = new LootBoxEntity();
+                premiumLootBox.setName("Premium LootBox");
+                premiumLootBox.setPrice(new BigDecimal("5"));
+                premiumLootBox.setRewards(new ArrayList<>()); // Initialize the list
+
+                lootBoxRepository.saveAll(Arrays.asList(basicLootBox, premiumLootBox));
+
+                RewardEntity commonReward = new RewardEntity();
+                commonReward.setValue(new BigDecimal("0.50"));
+                commonReward.setProbability(new BigDecimal("0.7"));
+
+                RewardEntity rareReward = new RewardEntity();
+                rareReward.setValue(new BigDecimal("2.00"));
+                rareReward.setProbability(new BigDecimal("0.25"));
+
+                RewardEntity epicReward = new RewardEntity();
+                epicReward.setValue(new BigDecimal("5.00"));
+                epicReward.setProbability(new BigDecimal("0.5"));
+
+                RewardEntity premiumCommon = new RewardEntity();
+                premiumCommon.setValue(new BigDecimal("2.00"));
+                premiumCommon.setProbability(new BigDecimal("0.6"));
+
+                RewardEntity premiumRare = new RewardEntity();
+                premiumRare.setValue(new BigDecimal("5.00"));
+                premiumRare.setProbability(new BigDecimal("0.3"));
+
+                RewardEntity legendaryReward = new RewardEntity();
+                legendaryReward.setValue(new BigDecimal("15.00"));
+                legendaryReward.setProbability(new BigDecimal("0.10"));
+
+                rewardRepository.saveAll(Arrays.asList(
+                        commonReward, rareReward, epicReward,
+                        premiumCommon, premiumRare, legendaryReward
+                ));
+
+                basicLootBox.getRewards().add(commonReward);
+                basicLootBox.getRewards().add(premiumRare);
+
+                premiumLootBox.getRewards().add(premiumCommon);
+                premiumLootBox.getRewards().add(premiumRare);
+                premiumLootBox.getRewards().add(legendaryReward);
+
+                lootBoxRepository.saveAll(Arrays.asList(basicLootBox, premiumLootBox));
+
+                System.out.println("Initial LootBoxes and rewards created successfully");
+            } else {
+                System.out.println("LootBoxes already exist, skipping initialization");
+            }
+        };
+    }
 }

backend/src/main/java/de/szut/casino/lootboxes/LootBoxController.java

@@ -0,0 +1,58 @@
+package de.szut.casino.lootboxes;
+
+import de.szut.casino.user.UserEntity;
+import de.szut.casino.user.UserRepository;
+import de.szut.casino.user.UserService;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+
+@RestController
+public class LootBoxController {
+    private final LootBoxRepository lootBoxRepository;
+    private final UserService userService;
+    private final LootBoxService lootBoxService;
+
+    public LootBoxController(LootBoxRepository lootBoxRepository, UserRepository userRepository, UserService userService, LootBoxService lootBoxService) {
+        this.lootBoxRepository = lootBoxRepository;
+        this.userService = userService;
+        this.lootBoxService = lootBoxService;
+    }
+
+    @GetMapping("/lootboxes")
+    public List<LootBoxEntity> getAllLootBoxes() {
+        return lootBoxRepository.findAll();
+    }
+
+    @PostMapping("/lootboxes/{id}")
+    public ResponseEntity<Object> purchaseLootBox(@PathVariable Long id, @RequestHeader("Authorization") String token) {
+        Optional<LootBoxEntity> optionalLootBox = lootBoxRepository.findById(id);
+        if (optionalLootBox.isEmpty()) {
+            return ResponseEntity.notFound().build();
+        }
+
+        LootBoxEntity lootBox = optionalLootBox.get();
+
+        Optional<UserEntity> optionalUser = userService.getCurrentUser(token);
+        if (optionalUser.isEmpty()) {
+            return ResponseEntity.notFound().build();
+        }
+
+        UserEntity user = optionalUser.get();
+
+        if (lootBoxService.hasSufficientBalance(user, lootBox.getPrice())) {
+            Map<String, String> errorResponse = new HashMap<>();
+            errorResponse.put("error", "Insufficient balance");
+            return ResponseEntity.badRequest().body(errorResponse);
+        }
+
+        RewardEntity reward = lootBoxService.determineReward(lootBox);
+        lootBoxService.handleBalance(user, lootBox, reward);
+
+        return ResponseEntity.ok(reward);
+    }
+}

backend/src/main/java/de/szut/casino/lootboxes/LootBoxEntity.java

@@ -0,0 +1,40 @@
+package de.szut.casino.lootboxes;
+
+import com.fasterxml.jackson.annotation.JsonBackReference;
+import com.fasterxml.jackson.annotation.JsonIgnore;
+import com.fasterxml.jackson.annotation.JsonManagedReference;
+import de.szut.casino.blackjack.CardEntity;
+import jakarta.persistence.*;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+import org.hibernate.annotations.SQLRestriction;
+
+import java.math.BigDecimal;
+import java.util.ArrayList;
+import java.util.List;
+
+@Entity
+@Getter
+@Setter
+@AllArgsConstructor
+@NoArgsConstructor
+public class LootBoxEntity {
+    @Id
+    @GeneratedValue
+    private Long id;
+
+    private String name;
+
+    @Column(precision = 19, scale = 2)
+    private BigDecimal price;
+
+    @ManyToMany(cascade = {CascadeType.PERSIST, CascadeType.MERGE})
+    @JoinTable(
+            name = "lootbox_reward",
+            joinColumns = @JoinColumn(name = "lootbox_id"),
+            inverseJoinColumns = @JoinColumn(name = "reward_id")
+    )
+    private List<RewardEntity> rewards = new ArrayList<>();
+}

backend/src/main/java/de/szut/casino/lootboxes/LootBoxRepository.java

@@ -0,0 +1,8 @@
+package de.szut.casino.lootboxes;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Service;
+
+@Service
+public interface LootBoxRepository extends JpaRepository<LootBoxEntity, Long> {
+}

backend/src/main/java/de/szut/casino/lootboxes/LootBoxService.java

@@ -0,0 +1,40 @@
+package de.szut.casino.lootboxes;
+
+import de.szut.casino.user.UserEntity;
+import de.szut.casino.user.UserRepository;
+import org.springframework.stereotype.Service;
+
+import java.math.BigDecimal;
+
+@Service
+public class LootBoxService {
+    private final UserRepository userRepository;
+
+    public LootBoxService(UserRepository userRepository) {
+        this.userRepository = userRepository;
+    }
+
+    public boolean hasSufficientBalance(UserEntity user, BigDecimal price) {
+        return user.getBalance().compareTo(price) < 0;
+    }
+
+    public RewardEntity determineReward(LootBoxEntity lootBox) {
+        double randomValue = Math.random();
+        BigDecimal cumulativeProbability = BigDecimal.ZERO;
+
+        for (RewardEntity reward : lootBox.getRewards()) {
+            cumulativeProbability = cumulativeProbability.add(reward.getProbability());
+            if (randomValue <= cumulativeProbability.doubleValue()) {
+                return reward;
+            }
+        }
+
+        return lootBox.getRewards().getLast();
+    }
+
+    public void handleBalance(UserEntity user, LootBoxEntity lootBox, RewardEntity reward) {
+        user.setBalance(user.getBalance().subtract(lootBox.getPrice()));
+        user.setBalance(user.getBalance().add(reward.getValue()));
+        userRepository.save(user);
+    }
+}

backend/src/main/java/de/szut/casino/lootboxes/RewardEntity.java

@@ -0,0 +1,30 @@
+package de.szut.casino.lootboxes;
+
+import com.fasterxml.jackson.annotation.JsonBackReference;
+import com.fasterxml.jackson.annotation.JsonManagedReference;
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.Setter;
+
+import java.math.BigDecimal;
+import java.util.ArrayList;
+import java.util.List;
+
+@Getter
+@Setter
+@Entity
+public class RewardEntity {
+    @Id
+    @GeneratedValue
+    private Long id;
+
+    @Column(precision = 19, scale = 2)
+    private BigDecimal value;
+
+    @Column(precision = 5, scale = 2)
+    private BigDecimal probability;
+
+    @ManyToMany(mappedBy = "rewards")
+    @JsonBackReference
+    private List<LootBoxEntity> lootBoxes = new ArrayList<>();
+}

backend/src/main/java/de/szut/casino/lootboxes/RewardRepository.java

@@ -0,0 +1,8 @@
+package de.szut.casino.lootboxes;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Service;
+
+@Service
+public interface RewardRepository extends JpaRepository<RewardEntity, Long> {
+}