add new concept report

backend/src/main/java/com/aiteacher/concept/ConceptReportController.java

@@ -0,0 +1,50 @@
+package com.aiteacher.concept;
+
+import com.aiteacher.topic.Topic;
+import com.aiteacher.topic.TopicRepository;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+import java.util.Map;
+import java.util.NoSuchElementException;
+import java.util.UUID;
+import java.util.stream.Collectors;
+
+@RestController
+@RequestMapping("/api/v1/topics/{id}/concept-reports")
+public class ConceptReportController {
+
+    private final TopicRepository topicRepository;
+    private final ConceptReportService conceptReportService;
+
+    public ConceptReportController(TopicRepository topicRepository,
+                                    ConceptReportService conceptReportService) {
+        this.topicRepository = topicRepository;
+        this.conceptReportService = conceptReportService;
+    }
+
+    @PostMapping
+    public ResponseEntity<ConceptReportResponse> generate(@PathVariable String id) {
+        Topic topic = topicRepository.findById(id)
+            .orElseThrow(() -> new NoSuchElementException("Topic not found."));
+        return ResponseEntity.ok(conceptReportService.generateReport(topic));
+    }
+
+    @GetMapping
+    public ResponseEntity<List<SavedConceptReportItem>> list(@PathVariable String id) {
+        topicRepository.findById(id)
+            .orElseThrow(() -> new NoSuchElementException("Topic not found."));
+        return ResponseEntity.ok(conceptReportService.listReports(id));
+    }
+
+    @GetMapping("/{reportId}")
+    public ResponseEntity<ConceptReportResponse> get(@PathVariable String id,
+                                                      @PathVariable UUID reportId) {
+        topicRepository.findById(id)
+            .orElseThrow(() -> new NoSuchElementException("Topic not found."));
+        Map<String, String> topicNames = topicRepository.findAll().stream()
+            .collect(Collectors.toMap(Topic::getId, Topic::getName, (a, b) -> a));
+        return ResponseEntity.ok(conceptReportService.getReport(reportId, topicNames));
+    }
+}