feat: add post like

internal/handler/social.go

@@ -125,6 +125,51 @@ func (h *PostHandler) Get(w http.ResponseWriter, r *http.Request) {
 	response.JSON(w, http.StatusOK, p)
 }
 
+// likeResp is returned by Like / Unlike — the new viewer state + effective
+// total (likes_count + pending Redis delta) so the client can reconcile.
+type likeResp struct {
+	Liked      bool `json:"liked"`
+	LikesCount int  `json:"likes_count"`
+}
+
+// Like — POST /posts/{id}/like. Idempotent. RequireAuth.
+func (h *PostHandler) Like(w http.ResponseWriter, r *http.Request) {
+	uid := middleware.UserID(r.Context())
+	id := chi.URLParam(r, "id")
+	count, err := h.svc.Like(r.Context(), uid, id)
+	if err != nil {
+		mapSocialErr(w, err)
+		return
+	}
+	response.JSON(w, http.StatusOK, likeResp{Liked: true, LikesCount: count})
+}
+
+// Unlike — DELETE /posts/{id}/like. Idempotent. RequireAuth.
+func (h *PostHandler) Unlike(w http.ResponseWriter, r *http.Request) {
+	uid := middleware.UserID(r.Context())
+	id := chi.URLParam(r, "id")
+	count, err := h.svc.Unlike(r.Context(), uid, id)
+	if err != nil {
+		mapSocialErr(w, err)
+		return
+	}
+	response.JSON(w, http.StatusOK, likeResp{Liked: false, LikesCount: count})
+}
+
+// ListLikes — GET /posts/{id}/likes?limit=&offset=&q=. Paginated "liked by"
+// users with optional name/handle search. Public (OptionalAuth).
+func (h *PostHandler) ListLikes(w http.ResponseWriter, r *http.Request) {
+	id := chi.URLParam(r, "id")
+	limit, offset := parseLimitOffset(r)
+	q := strings.TrimSpace(r.URL.Query().Get("q"))
+	users, total, err := h.svc.Likers(r.Context(), id, q, limit, offset)
+	if err != nil {
+		mapSocialErr(w, err)
+		return
+	}
+	response.JSON(w, http.StatusOK, followListResp{Users: users, Total: total})
+}
+
 func (h *PostHandler) Delete(w http.ResponseWriter, r *http.Request) {
 	uid := middleware.UserID(r.Context())
 	if err := h.svc.Delete(r.Context(), chi.URLParam(r, "id"), uid); err != nil {
@@ -443,10 +488,11 @@ type ProfileHandler struct {
 	posts       *repository.PostRepo
 	collections *repository.CollectionRepo
 	graph       *service.SocialGraphService
+	likes       *repository.LikeRepo
 }
 
-func NewProfileHandler(users *repository.UserRepo, posts *repository.PostRepo, collections *repository.CollectionRepo, graph *service.SocialGraphService) *ProfileHandler {
-	return &ProfileHandler{users: users, posts: posts, collections: collections, graph: graph}
+func NewProfileHandler(users *repository.UserRepo, posts *repository.PostRepo, collections *repository.CollectionRepo, graph *service.SocialGraphService, likes *repository.LikeRepo) *ProfileHandler {
+	return &ProfileHandler{users: users, posts: posts, collections: collections, graph: graph, likes: likes}
 }
 
 func (h *ProfileHandler) Get(w http.ResponseWriter, r *http.Request) {
@@ -527,6 +573,17 @@ func (h *ProfileHandler) Feed(w http.ResponseWriter, r *http.Request) {
 			}
 		}
 	}
+	// Like counts (effective) + viewer-liked state for every post in the page.
+	if len(posts) > 0 {
+		ptrs := make([]*model.Post, len(posts))
+		for i := range posts {
+			ptrs[i] = &posts[i]
+		}
+		if err := h.likes.Hydrate(r.Context(), viewerID, ptrs); err != nil {
+			mapSocialErr(w, err)
+			return
+		}
+	}
 	response.JSONWithMeta(w, http.StatusOK, posts, paginationMeta(total, limit, offset))
 }