✨ Feat/#309 학생용 강의 조회

backend/src/main/java/org/example/backend/domain/lecture/controller/LectureController.java

@@ -101,4 +101,17 @@ public ApiResponse<StudentTodayLectureResponseDTO> getStudentLectures(@RequestPa
         return ApiResponse.onSuccess(result);
     }
 
-}
+    // lecture id로 class id 조회
+    @GetMapping("/classes/{lectureId}")
+    public ApiResponse<ClassNameResponseDTO> getClassId(@PathVariable("lectureId") UUID lectureId) {
+        ClassNameResponseDTO result = lectureService.getClassId(lectureId);
+        return ApiResponse.onSuccess(result);
+    }
+
+    // 학생용 강의 조회
+    @GetMapping("/student/{lectureId}")
+    public ApiResponse<LectureResponseDTO> getStudnetLecture(@PathVariable("lectureId") UUID lectureId) {
+        LectureResponseDTO result = lectureStudentService.getLecture(lectureId);
+        return ApiResponse.onSuccess(result);
+    }
+}

backend/src/main/java/org/example/backend/domain/lecture/dto/response/ClassNameResponseDTO.java

@@ -0,0 +1,15 @@
+package org.example.backend.domain.lecture.dto.response;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+
+@Getter
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+public class ClassNameResponseDTO {
+    private String className;
+}

backend/src/main/java/org/example/backend/domain/lecture/service/LectureService.java

@@ -1,6 +1,7 @@
 package org.example.backend.domain.lecture.service;
 
 import org.example.backend.domain.lecture.dto.request.LectureRequestDTO;
+import org.example.backend.domain.lecture.dto.response.ClassNameResponseDTO;
 import org.example.backend.domain.lecture.dto.response.LectureRecordingResponseDTO;
 import org.example.backend.domain.lecture.dto.response.LectureResponseDTO;
 import org.example.backend.domain.lecture.dto.response.TodayLectureResponseDTO;
@@ -27,4 +28,6 @@ public interface LectureService {
     List<UUID> mapNotes(UUID lectureId, List<UUID> lectureNoteIds);
 
     List<TodayLectureResponseDTO> getClassListByProfessor(LocalDate date);
+
+    ClassNameResponseDTO getClassId(UUID lectureId);
 }

backend/src/main/java/org/example/backend/domain/lecture/service/LectureServiceImpl.java

@@ -6,6 +6,7 @@
 import org.example.backend.domain.classroom.repository.ClassroomRepository;
 import org.example.backend.domain.lecture.converter.LectureConverter;
 import org.example.backend.domain.lecture.dto.request.LectureRequestDTO;
+import org.example.backend.domain.lecture.dto.response.ClassNameResponseDTO;
 import org.example.backend.domain.lecture.dto.response.LectureRecordingResponseDTO;
 import org.example.backend.domain.lecture.dto.response.LectureResponseDTO;
 import org.example.backend.domain.lecture.dto.response.TodayLectureResponseDTO;
@@ -303,5 +304,17 @@ public void updateLectureSessions(UUID classId) {
         lectureRepository.saveAll(lectures);
     }
 
+    // 강의 id 기반 클래스 id 조회
+    @Override
+    public ClassNameResponseDTO getClassId(UUID lectureId) {
+        // 1. 강의 조회
+        Lecture lecture = lectureRepository.findById(lectureId)
+                .orElseThrow(() -> new LectureException(LectureErrorCode.LECTURE_NOT_FOUND));
+        // 2. 클래스 조회
+        Classroom classroom = lecture.getClassroom();
 
+        return ClassNameResponseDTO.builder()
+                .className(classroom.getClassName())
+                .build();
+    }
 }

backend/src/main/java/org/example/backend/domain/lecture/service/LectureStudentService.java

@@ -1,10 +1,13 @@
 package org.example.backend.domain.lecture.service;
 
+import org.example.backend.domain.lecture.dto.response.LectureResponseDTO;
 import org.example.backend.domain.lecture.dto.response.StudentTodayLectureResponseDTO;
 
 import java.time.LocalDate;
+import java.util.UUID;
 
 public interface LectureStudentService {
     StudentTodayLectureResponseDTO getClassListByStudent(LocalDate date);
+    LectureResponseDTO getLecture(UUID lectureId);
 
 }

backend/src/main/java/org/example/backend/domain/lecture/service/LectureStudentServiceImpl.java

@@ -4,23 +4,27 @@
 import org.example.backend.domain.classroom.entity.Classroom;
 import org.example.backend.domain.classroom.repository.ClassroomRepository;
 import org.example.backend.domain.lecture.converter.LectureStudentConverter;
+import org.example.backend.domain.lecture.dto.response.LectureResponseDTO;
 import org.example.backend.domain.lecture.dto.response.StudentTodayLectureResponseDTO;
 import org.example.backend.domain.lecture.entity.Lecture;
+import org.example.backend.domain.lecture.exception.LectureErrorCode;
+import org.example.backend.domain.lecture.exception.LectureException;
 import org.example.backend.domain.lecture.repository.LectureRepository;
+import org.example.backend.domain.quiz.entity.Quiz;
+import org.example.backend.domain.quiz.exception.QuizErrorCode;
+import org.example.backend.domain.quiz.exception.QuizException;
+import org.example.backend.domain.quiz.repository.QuizRepository;
+import org.example.backend.domain.quizAnswer.repository.QuizAnswerRepository;
 import org.example.backend.domain.studentClass.repository.StudentClassRepository;
+import org.example.backend.domain.user.entity.Role;
+import org.example.backend.global.security.auth.CustomSecurityUtil;
 import org.example.backend.global.security.auth.CustomUserDetails;
 import org.springframework.security.core.context.SecurityContextHolder;
 import org.springframework.stereotype.Service;
 
-import java.time.LocalDate;
-import java.time.LocalTime;
-import java.time.ZoneId;
-import java.time.ZonedDateTime;
-import java.util.ArrayList;
-import java.util.Comparator;
-import java.util.List;
-import java.util.UUID;
-import java.util.Collections;
+import java.time.*;
+import java.time.format.TextStyle;
+import java.util.*;
 
 @Service
 @RequiredArgsConstructor
@@ -30,6 +34,9 @@ public class LectureStudentServiceImpl implements LectureStudentService {
     private final LectureRepository lectureRepository;
     private final ClassroomRepository classroomRepository;
     private final LectureStudentConverter lectureStudentConverter;
+    private final QuizRepository quizRepository;
+    private final QuizAnswerRepository quizAnswerRepository;
+    private final CustomSecurityUtil customSecurityUtil;
 
     // 오늘의 강의 목록
     @Override
@@ -70,4 +77,62 @@ public StudentTodayLectureResponseDTO getClassListByStudent(LocalDate date) {
         return lectureStudentConverter.toStudentLectureListDTO(dtoList, done);
 
     }
+
+    // lecture 조회
+    @Override
+    public LectureResponseDTO getLecture(UUID lectureId) {
+
+        Lecture lecture = lectureRepository.findById(lectureId)
+                .orElseThrow(() -> new LectureException(LectureErrorCode.LECTURE_NOT_FOUND));
+
+        UUID userId = customSecurityUtil.getUserId();
+
+        // 서울 시간 기준 now
+        ZonedDateTime now = ZonedDateTime.now(ZoneId.of("Asia/Seoul"));
+
+        ZonedDateTime startDateTime = ZonedDateTime.of(
+                LocalDateTime.of(lecture.getLectureDate(), lecture.getStartTime()),
+                ZoneId.of("Asia/Seoul")
+        );
+
+        ZonedDateTime endDateTime = ZonedDateTime.of(
+                LocalDateTime.of(lecture.getLectureDate(), lecture.getEndTime()),
+                ZoneId.of("Asia/Seoul")
+        );
+
+        String status;
+
+        if (now.isBefore(startDateTime)) {
+            status = "beforeLecture";
+        } else if (!now.isBefore(startDateTime) && now.isBefore(endDateTime)) {
+            status = "onLecture";
+        } else {
+            boolean hasQuiz = quizRepository.existsByLectureId(lecture.getId());
+            if (!hasQuiz) {
+                status = "afterLectureBeforeQuiz";
+            } else{
+                List<Quiz> quizzes = quizRepository.findByLectureId(lecture.getId());
+
+                boolean allSubmitted = quizzes.stream()
+                        .allMatch(q -> quizAnswerRepository.existsByUserIdAndQuizId(userId, q.getId()));
+                status = allSubmitted ? "viewMyQuizResult" : "quizReadyForSubmission";
+            }
+        }
+
+        String weekDay = lecture.getLectureDate()
+                .getDayOfWeek()
+                .getDisplayName(TextStyle.SHORT, Locale.KOREAN);
+
+        return LectureResponseDTO.builder()
+                .lectureId(lecture.getId())
+                .classId(lecture.getClassroom().getId().toString())
+                .lectureName(lecture.getLectureName())
+                .lectureDate(lecture.getLectureDate())
+                .weekDay(weekDay)
+                .session(lecture.getSession())
+                .startTime(lecture.getStartTime())
+                .endTime(lecture.getEndTime())
+                .status(status)
+                .build();
+    }
 }

backend/src/main/java/org/example/backend/domain/quiz/repository/QuizRepository.java

@@ -11,4 +11,5 @@ public interface QuizRepository extends JpaRepository<Quiz, UUID> {
     List<Quiz> findByLectureId(UUID lectureId);
     Optional<Quiz> findByLectureIdAndQuizOrder(UUID lectureId, int quizOrder);
     boolean existsByLectureId(UUID lectureId);
+
 }