feat: added getItem, deleteItem and postItem endpoints implementation for lesson26 by Yemi

lesson_26/api/java/api_app/src/main/java/com/codedifferently/lesson26/web/MediaItemRequest.java

@@ -33,7 +33,7 @@ public class MediaItemRequest {
 
   public static MediaItem asMediaItem(MediaItemRequest request) {
     var id = request.id != null ? request.id : UUID.randomUUID();
-    switch (request.type.toUpperCase()) {
+    switch (request.type.toLowerCase()) {
       case "book" -> {
         return new Book(id, request.title, request.isbn, List.of(request.authors), request.pages);
       }

lesson_26/api/java/api_app/src/main/java/com/codedifferently/lesson26/web/MediaItemsController.java

@@ -4,11 +4,19 @@
 import com.codedifferently.lesson26.library.Library;
 import com.codedifferently.lesson26.library.MediaItem;
 import com.codedifferently.lesson26.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.CrossOrigin;
+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;
 
 @RestController
@@ -29,4 +37,44 @@ public GetMediaItemsResponse getItems() {
     var response = GetMediaItemsResponse.builder().items(responseItems).build();
     return response;
   }
+
+  @GetMapping("/items/{id}")
+  public ResponseEntity<MediaItemResponse> getItem(@PathVariable UUID id) {
+    String enteredId = id.toString();
+    Set<MediaItem> items = library.search(SearchCriteria.builder().id(enteredId).build());
+
+    if (items.isEmpty()) {
+      return ResponseEntity.status(HttpStatus.NOT_FOUND).build();
+    }
+    MediaItem item = items.iterator().next();
+    MediaItemResponse response = MediaItemResponse.from(item);
+    return ResponseEntity.ok(response);
+  }
+
+  @DeleteMapping("/items/{id}")
+  public ResponseEntity<Void> deleteItem(@PathVariable UUID id) {
+    Set<MediaItem> items = library.search(SearchCriteria.builder().build());
+    List<MediaItemResponse> itemToDelete =
+        items.stream()
+            .map(MediaItemResponse::from) // Transform the original objects
+            .filter(item -> item.getId().equals(id))
+            .toList();
+    if (itemToDelete.isEmpty()) {
+      return ResponseEntity.status(HttpStatus.NOT_FOUND).build();
+    }
+    library.removeMediaItem(id, librarian);
+    return ResponseEntity.status(HttpStatus.NO_CONTENT).build();
+  }
+
+  @PostMapping("/items")
+  public CreateMediaItemResponse addsItem(
+      @Valid @RequestBody CreateMediaItemRequest mediaItemRequest) {
+
+    MediaItem mediaItem = MediaItemRequest.asMediaItem(mediaItemRequest.getItem());
+    library.addMediaItem(mediaItem, librarian);
+    var response =
+        CreateMediaItemResponse.builder().item(getItem(mediaItem.getId()).getBody()).build();
+
+    return response;
+  }
 }