first implementation

backend/src/main/java/com/aiteacher/book/BookController.java

@@ -0,0 +1,75 @@
+package com.aiteacher.book;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+import org.springframework.web.multipart.MultipartFile;
+
+import java.io.IOException;
+import java.time.Instant;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+
+@RestController
+@RequestMapping("/api/v1/books")
+public class BookController {
+
+    private final BookService bookService;
+
+    public BookController(BookService bookService) {
+        this.bookService = bookService;
+    }
+
+    @PostMapping(consumes = "multipart/form-data")
+    public ResponseEntity<?> upload(@RequestParam("file") MultipartFile file) throws IOException {
+        Book book = bookService.upload(file);
+        return ResponseEntity.status(HttpStatus.ACCEPTED).body(toSummaryResponse(book));
+    }
+
+    @GetMapping
+    public ResponseEntity<List<Map<String, Object>>> list() {
+        List<Map<String, Object>> books = bookService.listAll().stream()
+            .map(this::toFullResponse)
+            .toList();
+        return ResponseEntity.ok(books);
+    }
+
+    @GetMapping("/{id}")
+    public ResponseEntity<Map<String, Object>> get(@PathVariable UUID id) {
+        Book book = bookService.getById(id);
+        return ResponseEntity.ok(toFullResponse(book));
+    }
+
+    @DeleteMapping("/{id}")
+    public ResponseEntity<Void> delete(@PathVariable UUID id) {
+        bookService.delete(id);
+        return ResponseEntity.noContent().build();
+    }
+
+    private Map<String, Object> toSummaryResponse(Book book) {
+        return Map.of(
+            "id", book.getId(),
+            "title", book.getTitle(),
+            "fileName", book.getFileName(),
+            "status", book.getStatus().name(),
+            "uploadedAt", book.getUploadedAt()
+        );
+    }
+
+    private Map<String, Object> toFullResponse(Book book) {
+        var map = new java.util.LinkedHashMap<String, Object>();
+        map.put("id", book.getId());
+        map.put("title", book.getTitle());
+        map.put("fileName", book.getFileName());
+        map.put("fileSizeBytes", book.getFileSizeBytes());
+        map.put("pageCount", book.getPageCount());
+        map.put("status", book.getStatus().name());
+        map.put("uploadedAt", book.getUploadedAt());
+        map.put("processedAt", book.getProcessedAt());
+        if (book.getErrorMessage() != null) {
+            map.put("errorMessage", book.getErrorMessage());
+        }
+        return map;
+    }
+}