Update CharacterService.java

src/main/java/com/mosabulgyeo/bewavoca/service/CharacterService.java

@@ -38,18 +38,26 @@ public CharacterService(CharacterRepository characterRepository, UserRepository
 	 * @throws IllegalArgumentException 사용자가 존재하지 않을 경우
 	 */
 	public List<CharacterResponse> getAvailableCharacters(String deviceId) {
+		// 사용자 확인
 		User user = userRepository.findByDeviceId(deviceId)
 			.orElseThrow(() -> new IllegalArgumentException("User not found for this device."));
 
-		List<Character> availableCharacters = characterRepository.findAll().stream()
+		// 기본 캐릭터(ID 1번) 조회
+		Character defaultCharacter = characterRepository.findById(1L)
+			.orElseThrow(() -> new IllegalStateException("Default character (ID 1) not found"));
+
+		// 사용자가 클리어한 지역에 따라 잠금 해제된 캐릭터 필터링
+		List<Character> unlockedCharacters = characterRepository.findAll().stream()
 			.filter(character -> user.hasClearedRegion(character.getRegion().getId()))
 			.collect(Collectors.toList());
 
-		if (availableCharacters.isEmpty()) {
-			throw new IllegalArgumentException("No available characters for this device.");
+		// 기본 캐릭터(ID 1번)를 추가
+		if (unlockedCharacters.stream().noneMatch(character -> character.getId().equals(defaultCharacter.getId()))) {
+			unlockedCharacters.add(defaultCharacter);
 		}
 
-		return availableCharacters.stream()
+		// 캐릭터 리스트를 DTO로 변환하여 반환
+		return unlockedCharacters.stream()
 			.map(character -> new CharacterResponse(
 				character.getId(),
 				character.getName(),
@@ -114,4 +122,4 @@ public CharacterResponse getSelectedCharacter(String deviceId) {
 			character.getRegion().getName()
 		);
 	}
-}
+}