feat: add post like

internal/server/server.go

@@ -162,7 +162,10 @@ func (s *Server) initAuth(cfg *config.Config, logger *zap.Logger) {
 	postRepo := repository.NewPostRepo(s.pg)
 	bookmarkRepo := repository.NewBookmarkRepo(s.pg)
 	collectionRepo := repository.NewCollectionRepo(s.pg)
-	postSvc := service.NewPostService(postRepo, r2)
+	// Likes: membership in Postgres, count delta batched through Redis
+	// (s.redis may be nil — LikeRepo then applies counts directly).
+	likeRepo := repository.NewLikeRepo(s.pg, s.redis, logger)
+	postSvc := service.NewPostService(postRepo, r2, likeRepo)
 	bookmarkSvc := service.NewBookmarkService(userRepo, bookmarkRepo)
 	collectionSvc := service.NewCollectionService(userRepo, collectionRepo, postRepo, r2)
 
@@ -210,6 +213,9 @@ func (s *Server) initAuth(cfg *config.Config, logger *zap.Logger) {
 	pushSender := service.NewPushSender(pushRepo, cfg.VAPIDPublicKey, cfg.VAPIDPrivateKey, cfg.VAPIDSubject, logger)
 	s.pushH = handler.NewPushHandler(pushSender, pushRepo)
 	notifSvc := service.NewNotificationService(notifRepo, userRepo, mail, rtClient, pushSender, logger, cfg.FrontendURL)
+	// Wire the notification seam into the post service so a new like notifies
+	// the author (push + realtime; not the liker themselves).
+	postSvc.SetNotifier(notifSvc)
 
 	// Sādhana reminders: a background worker nudges users (email + push +
 	// websocket) to chant / post a quote at their local time. Shares the
@@ -223,11 +229,15 @@ func (s *Server) initAuth(cfg *config.Config, logger *zap.Logger) {
 	}
 	worker.NewReminderWorker(reminderSvc, logger).Run(wctx)
 
+	// Likes worker: folds the pending Redis like-deltas into posts.likes_count
+	// every 15 minutes (no-op when Redis is unavailable).
+	worker.NewLikesWorker(likeRepo, logger).Run(wctx)
+
 	graphSvc := service.NewSocialGraphService(followRepo, blockRepo, reportRepo, postRepo, userRepo, notifSvc, mail, cfg.FeedbackAdminEmails, logger)
 	s.relationH = handler.NewRelationshipHandler(graphSvc)
 	s.notificationH = handler.NewNotificationHandler(notifSvc)
 	s.postH = handler.NewPostHandler(postSvc, graphSvc)
-	s.profileH = handler.NewProfileHandler(userRepo, postRepo, collectionRepo, graphSvc)
+	s.profileH = handler.NewProfileHandler(userRepo, postRepo, collectionRepo, graphSvc, likeRepo)
 
 	// Sādhana streak: daily chanting log + the growing-plant state. Reads
 	// the chanting half from sadhna_logs and the posting half from the
@@ -631,6 +641,8 @@ func (s *Server) setupRouter() {
 			r.Group(func(r chi.Router) {
 				r.Use(middleware.OptionalAuth(s.authIssuer, s.userRepo))
 				r.Get("/{id}", s.postH.Get)
+				// Paginated "liked by" list — public, like the count itself.
+				r.Get("/{id}/likes", s.postH.ListLikes)
 			})
 			// Protected — create / delete / image presign / "my posts" /
 			// reshare actions.
@@ -646,6 +658,10 @@ func (s *Server) setupRouter() {
 				// double-clicks don't 4xx.
 				r.Post("/{id}/reshare", s.postH.Reshare)
 				r.Delete("/{id}/reshare", s.postH.Unreshare)
+				// Like / unlike — idempotent; membership is written now, the
+				// count is batched into likes_count via Redis.
+				r.Post("/{id}/like", s.postH.Like)
+				r.Delete("/{id}/like", s.postH.Unlike)
 				// Report a post (category + optional reason) → admin email.
 				r.Post("/{id}/report", s.postH.Report)
 			})