Feat: Added functions postItems, getMediaItem, and deleteMediaItem

lesson_16/api/api_app/src/main/java/com/codedifferently/lesson16/web/MediaItemsController.java

@@ -4,11 +4,20 @@
 import com.codedifferently.lesson16.library.Library;
 import com.codedifferently.lesson16.library.MediaItem;
 import com.codedifferently.lesson16.library.search.SearchCriteria;
+import jakarta.validation.Valid;
 import java.io.IOException;
 import java.util.List;
 import java.util.Set;
+import java.util.UUID;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.DeleteMapping;
 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.RestController;
+import org.springframework.web.server.ResponseStatusException;
 
 @RestController
 public class MediaItemsController {
@@ -27,4 +36,31 @@ public GetMediaItemsResponse getItems() {
     var response = GetMediaItemsResponse.builder().items(responseItems).build();
     return response;
   }
+
+  @PostMapping("/items")
+  public CreateMediaItemResponse postItem(@Valid @RequestBody CreateMediaItemRequest req) {
+    MediaItem media = MediaItemRequest.asMediaItem(req.getItem());
+    library.addMediaItem(media, librarian);
+    return CreateMediaItemResponse.builder().item(MediaItemResponse.from(media)).build();
+  }
+
+  @GetMapping("/items/{id}")
+  public GetMediaItemsResponse getMediaItem(@PathVariable String id) {
+    Set<MediaItem> items = library.search(SearchCriteria.builder().id(id).build());
+    if (items.isEmpty()) {
+      throw new ResponseStatusException(HttpStatus.NOT_FOUND, "Media item not found");
+    }
+    List<MediaItemResponse> responseItems = items.stream().map(MediaItemResponse::from).toList();
+    var response = GetMediaItemsResponse.builder().items(responseItems).build();
+    return response;
+  }
+
+  @DeleteMapping("/items/{id}")
+  public ResponseEntity<Void> deleteMediaItem(@PathVariable String id) {
+    if (!library.hasMediaItem(UUID.fromString(id))) {
+      throw new ResponseStatusException(HttpStatus.NOT_FOUND, "Media item not found");
+    }
+    library.removeMediaItem(UUID.fromString(id), librarian);
+    return ResponseEntity.noContent().build();
+  }
 }