feat(collections,media): add bulk operations for books and collections

Collections:
- HandleBulkAddBooks: add multiple books to multiple collections

Media:
- HandleBulkDelete: delete multiple media items
- HandleBulkUpdate: bulk update book metadata (tags, status)
- Individual result tracking for each operation
- WebSocket broadcasts for collection updates

internal/handlers/media.go

@@ -260,3 +260,197 @@ func (h *MediaHandler) ClearShelf(c echo.Context) error {
 		"message": result,
 	})
 }
+
+// Bulk Operations
+
+// POST /api/books/bulk-delete
+// Bulk delete books
+func (h *MediaHandler) HandleBulkDelete(c echo.Context) error {
+	var req struct {
+		BookIDs []string `json:"book_ids" validate:"required"`
+	}
+
+	if err := c.Bind(&req); err != nil {
+		return c.JSON(http.StatusBadRequest, map[string]string{"error": "Invalid request"})
+	}
+
+	if len(req.BookIDs) == 0 {
+		return c.JSON(http.StatusBadRequest, map[string]string{"error": "book_ids required"})
+	}
+
+	results := make([]map[string]interface{}, 0)
+	successCount := 0
+	failedCount := 0
+
+	for _, bookIDStr := range req.BookIDs {
+		bookID, err := uuid.Parse(bookIDStr)
+		if err != nil {
+			results = append(results, map[string]interface{}{
+				"book_id": bookIDStr,
+				"status":  "error",
+				"error":   "Invalid UUID",
+			})
+			failedCount++
+			continue
+		}
+
+		bookUUID := pgtype.UUID{Bytes: bookID, Valid: true}
+
+		book, err := h.db.GetMediaItem(c.Request().Context(), bookUUID)
+		if err != nil {
+			results = append(results, map[string]interface{}{
+				"book_id": bookIDStr,
+				"status":  "error",
+				"error":   "Book not found",
+			})
+			failedCount++
+			continue
+		}
+
+		err = h.db.DeleteMediaItem(c.Request().Context(), bookUUID)
+		if err != nil {
+			results = append(results, map[string]interface{}{
+				"book_id": bookIDStr,
+				"status":  "error",
+				"error":   err.Error(),
+			})
+			failedCount++
+			continue
+		}
+
+		if book.FilePath != "" {
+			os.Remove(book.FilePath)
+		}
+
+		results = append(results, map[string]interface{}{
+			"book_id": bookIDStr,
+			"status":  "success",
+		})
+		successCount++
+	}
+
+	return c.JSON(http.StatusOK, map[string]interface{}{
+		"results": results,
+		"total":   len(req.BookIDs),
+		"success": successCount,
+		"failed":  failedCount,
+	})
+}
+
+// POST /api/books/bulk-update
+// Bulk update book metadata
+func (h *MediaHandler) HandleBulkUpdate(c echo.Context) error {
+	var req struct {
+		Updates []struct {
+			BookID  string `json:"book_id" validate:"required"`
+			Updates struct {
+				Title    *string `json:"title,omitempty"`
+				Author   *string `json:"author,omitempty"`
+				Genre    *string `json:"genre,omitempty"`
+				Language *string `json:"language,omitempty"`
+				Tags     *string `json:"tags,omitempty"`
+			} `json:"updates"`
+		} `json:"updates" validate:"required"`
+	}
+
+	if err := c.Bind(&req); err != nil {
+		return c.JSON(http.StatusBadRequest, map[string]string{"error": "Invalid request"})
+	}
+
+	if len(req.Updates) == 0 {
+		return c.JSON(http.StatusBadRequest, map[string]string{"error": "updates required"})
+	}
+
+	results := make([]map[string]interface{}, 0)
+	successCount := 0
+	failedCount := 0
+
+	for _, update := range req.Updates {
+		bookID, err := uuid.Parse(update.BookID)
+		if err != nil {
+			results = append(results, map[string]interface{}{
+				"book_id": update.BookID,
+				"status":  "error",
+				"error":   "Invalid UUID",
+			})
+			failedCount++
+			continue
+		}
+
+		bookUUID := pgtype.UUID{Bytes: bookID, Valid: true}
+
+		existingBook, err := h.db.GetMediaItem(c.Request().Context(), bookUUID)
+		if err != nil {
+			results = append(results, map[string]interface{}{
+				"book_id": update.BookID,
+				"status":  "error",
+				"error":   "Book not found",
+			})
+			failedCount++
+			continue
+		}
+
+		updateParams := database.UpdateMediaItemParams{
+			ID:             bookUUID,
+			Title:          existingBook.Title,
+			Author:         existingBook.Author,
+			Genre:          existingBook.Genre,
+			Language:       existingBook.Language,
+			Tags:           existingBook.Tags,
+			Description:    existingBook.Description,
+			Publisher:      existingBook.Publisher,
+			CopyrightYear:  existingBook.CopyrightYear,
+			Isbn:           existingBook.Isbn,
+			Series:         existingBook.Series,
+			SeriesNumber:   existingBook.SeriesNumber,
+			Asin:           existingBook.Asin,
+			DatePublished:  existingBook.DatePublished,
+			Contributors:   existingBook.Contributors,
+			Edition:        existingBook.Edition,
+			PageCount:      existingBook.PageCount,
+			GoodreadsID:    existingBook.GoodreadsID,
+			OpenlibraryID:  existingBook.OpenlibraryID,
+			CoverImagePath: existingBook.CoverImagePath,
+		}
+
+		if update.Updates.Title != nil {
+			updateParams.Title = *update.Updates.Title
+		}
+		if update.Updates.Author != nil {
+			updateParams.Author = pgtype.Text{String: *update.Updates.Author, Valid: true}
+		}
+		if update.Updates.Genre != nil {
+			updateParams.Genre = pgtype.Text{String: *update.Updates.Genre, Valid: true}
+		}
+		if update.Updates.Language != nil {
+			updateParams.Language = pgtype.Text{String: *update.Updates.Language, Valid: true}
+		}
+		if update.Updates.Tags != nil {
+			updateParams.Tags = pgtype.Text{String: *update.Updates.Tags, Valid: true}
+		}
+
+		_, err = h.db.UpdateMediaItem(c.Request().Context(), updateParams)
+		if err != nil {
+			results = append(results, map[string]interface{}{
+				"book_id": update.BookID,
+				"status":  "error",
+				"error":   err.Error(),
+			})
+			failedCount++
+			continue
+		}
+
+		results = append(results, map[string]interface{}{
+			"book_id": update.BookID,
+			"status":  "success",
+		})
+		successCount++
+	}
+
+	return c.JSON(http.StatusOK, map[string]interface{}{
+		"results": results,
+		"total":   len(req.Updates),
+		"success": successCount,
+		"failed":  failedCount,
+	})
+}