1 files changed, 75 insertions, 0 deletions
diff --git a/backend/feed/feed.go b/backend/feed/feed.go
new file mode 100644
index 0000000..4349d1e
--- /dev/null
+++ b/backend/feed/feed.go
@@ -0,0 +1,75 @@
+package feed
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/mmcdole/gofeed"
+
+	"undef.ninja/x/feedaka/db"
+)
+
+func Fetch(ctx context.Context, url string) (*gofeed.Feed, error) {
+	fp := gofeed.NewParser()
+	ctx, cancel := context.WithTimeout(ctx, 10*time.Second)
+	defer cancel()
+	feed, err := fp.ParseURLWithContext(url, ctx)
+	if err != nil {
+		return nil, fmt.Errorf("failed to fetch %s: %w", url, err)
+	}
+	return feed, nil
+}
+
+func Sync(ctx context.Context, queries *db.Queries, feedID int64, f *gofeed.Feed) error {
+	err := queries.UpdateFeedMetadata(ctx, db.UpdateFeedMetadataParams{
+		Title:     f.Title,
+		FetchedAt: time.Now().UTC().Format(time.RFC3339),
+		ID:        feedID,
+	})
+	if err != nil {
+		return err
+	}
+
+	guids, err := queries.GetArticleGUIDsByFeed(ctx, feedID)
+	if err != nil {
+		return err
+	}
+	existingFeedGUIDs := make(map[string]bool, len(guids))
+	for _, guid := range guids {
+		existingFeedGUIDs[guid] = true
+	}
+
+	for _, item := range f.Items {
+		if existingFeedGUIDs[item.GUID] {
+			err := queries.UpdateArticle(ctx, db.UpdateArticleParams{
+				Title:  item.Title,
+				Url:    item.Link,
+				FeedID: feedID,
+				Guid:   item.GUID,
+			})
+			if err != nil {
+				return err
+			}
+		} else {
+			exists, err := queries.CheckArticleExistsByGUID(ctx, item.GUID)
+			if err != nil {
+				return err
+			}
+			if exists == 1 {
+				continue
+			}
+			_, err = queries.CreateArticle(ctx, db.CreateArticleParams{
+				FeedID: feedID,
+				Guid:   item.GUID,
+				Title:  item.Title,
+				Url:    item.Link,
+				IsRead: 0,
+			})
+			if err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}