feat: add feed

internal/service/social_service.go

@@ -212,6 +212,40 @@ func (s *PostService) ListByHandle(ctx context.Context, handle, viewerID string,
 	return posts, total, nil
 }
 
+// Feed is the global, personalised home feed: posts from across the platform,
+// prioritising not-yet-liked posts from people the viewer follows. Fully
+// hydrated (reshare/like/mention/comment state) plus the viewer↔author
+// relationship so the card can show Follow / Follow Back. Returns at most
+// `limit` posts; the caller infers "more" from a full page.
+func (s *PostService) Feed(ctx context.Context, viewerID string, limit, offset int) ([]model.Post, error) {
+	if limit <= 0 || limit > 50 {
+		limit = 10
+	}
+	if offset < 0 {
+		offset = 0
+	}
+	posts, err := s.posts.FeedForViewer(ctx, viewerID, limit, offset)
+	if err != nil {
+		return nil, err
+	}
+	if err := s.hydrateReshareStatesSlice(ctx, viewerID, posts); err != nil {
+		return nil, err
+	}
+	if err := s.hydrateLikesSlice(ctx, viewerID, posts); err != nil {
+		return nil, err
+	}
+	if err := s.hydrateMentionsSlice(ctx, posts); err != nil {
+		return nil, err
+	}
+	if err := s.hydratePinnedSlice(ctx, viewerID, posts); err != nil {
+		return nil, err
+	}
+	if err := s.posts.HydrateViewerRelationships(ctx, viewerID, posts); err != nil {
+		return nil, err
+	}
+	return posts, nil
+}
+
 // hydratePinnedSlice fills PinnedComment on a value slice.
 func (s *PostService) hydratePinnedSlice(ctx context.Context, viewerID string, posts []model.Post) error {
 	if len(posts) == 0 {