feature: 멤버 정보 조회 api 추가 (#38)

src/main/java/com/goldbalance/dive/domain/member/api/MemberController.java

@@ -2,11 +2,14 @@
 
 import com.goldbalance.dive.domain.member.dto.MemberLogin;
 import com.goldbalance.dive.domain.member.dto.request.MemberSignin;
+import com.goldbalance.dive.domain.member.dto.response.MemberInfo;
 import com.goldbalance.dive.domain.member.service.MemberService;
 import jakarta.validation.Valid;
 import lombok.RequiredArgsConstructor;
 import org.springframework.http.HttpStatusCode;
 import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RequestMapping;
@@ -30,4 +33,10 @@ public ResponseEntity<MemberLogin> login(@Valid @RequestBody MemberLogin request
         MemberLogin response = memberService.login(request);
         return ResponseEntity.ok(response);
     }
+
+    @GetMapping("/{nickname}")
+    public ResponseEntity<MemberInfo> getMemberInfo(@PathVariable String nickname) {
+        MemberInfo response = memberService.getMemberInfo(nickname);
+        return ResponseEntity.ok(response);
+    }
 }

src/main/java/com/goldbalance/dive/domain/member/dto/response/MemberInfo.java

@@ -0,0 +1,27 @@
+package com.goldbalance.dive.domain.member.dto.response;
+
+import com.goldbalance.dive.domain.member.domain.Member;
+import java.util.List;
+
+public record MemberInfo(
+        String nickname,
+        String tier,
+        String mileage,
+        String monthlyMileage,
+        String overallMonthlyRank,
+        String tierMonthlyRank,
+        int totalMembers,
+        int totalTierMembers) {
+    public static MemberInfo of(
+            Member member, List<Member> orderByMonthlyMileageDesc, List<Member> orderByTotalMileageDesc) {
+        return new MemberInfo(
+                member.getNickname(),
+                member.getTier().getTierName(),
+                member.getTotalMileage() + "P",
+                member.getMonthlyMileage() + "P",
+                orderByMonthlyMileageDesc.indexOf(member) + 1 + "등",
+                orderByTotalMileageDesc.indexOf(member) + 1 + "등",
+                orderByMonthlyMileageDesc.size(),
+                orderByTotalMileageDesc.size());
+    }
+}

src/main/java/com/goldbalance/dive/domain/member/repository/MemberRepository.java

@@ -1,11 +1,16 @@
 package com.goldbalance.dive.domain.member.repository;
 
 import com.goldbalance.dive.domain.member.domain.Member;
+import java.util.List;
 import java.util.Optional;
 import org.springframework.data.jpa.repository.JpaRepository;
 
 public interface MemberRepository extends JpaRepository<Member, Long> {
     boolean existsByNickname(String nickname);
 
     Optional<Member> findByNickname(String nickname);
+
+    List<Member> findByOrderByMonthlyMileageDesc();
+
+    List<Member> findByOrderByTotalMileageDesc();
 }

src/main/java/com/goldbalance/dive/domain/member/service/MemberService.java

@@ -5,8 +5,10 @@
 import com.goldbalance.dive.domain.member.domain.Member;
 import com.goldbalance.dive.domain.member.dto.MemberLogin;
 import com.goldbalance.dive.domain.member.dto.request.MemberSignin;
+import com.goldbalance.dive.domain.member.dto.response.MemberInfo;
 import com.goldbalance.dive.domain.member.repository.MemberRepository;
 import com.goldbalance.dive.global.exception.CustomException;
+import java.util.List;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.stereotype.Service;
@@ -41,4 +43,13 @@ public MemberLogin login(MemberLogin request) {
         log.info("[MemberService] 멤버 로그인 memberId = {}", member.getId());
         return MemberLogin.from(member);
     }
+
+    public MemberInfo getMemberInfo(String nickname) {
+        Member member =
+                memberRepository.findByNickname(nickname).orElseThrow(() -> new CustomException(MEMBER_NOT_FOUND));
+        List<Member> orderByMonthlyMileageDesc = memberRepository.findByOrderByMonthlyMileageDesc();
+        List<Member> orderByTotalMileageDesc = memberRepository.findByOrderByTotalMileageDesc();
+
+        return MemberInfo.of(member, orderByMonthlyMileageDesc, orderByTotalMileageDesc);
+    }
 }