update npc interaction

backend/cmd/server/main.go

@@ -64,6 +64,7 @@ func main() {
 	// Stores (created before hub callbacks which reference them).
 	heroStore := storage.NewHeroStore(pgPool, logger)
 	logStore := storage.NewLogStore(pgPool)
+	questStore := storage.NewQuestStore(pgPool)
 	runtimeConfigStore := storage.NewRuntimeConfigStore(pgPool)
 	if err := tuning.ReloadNow(ctx, logger, runtimeConfigStore); err != nil {
 		logger.Error("failed to load runtime config", "error", err)
@@ -172,7 +173,7 @@ func main() {
 
 	// Record server start time for catch-up gap calculation.
 	serverStartedAt := time.Now()
-	offlineSim := game.NewOfflineSimulator(heroStore, logStore, roadGraph, logger, func() bool {
+	offlineSim := game.NewOfflineSimulator(heroStore, logStore, questStore, roadGraph, logger, func() bool {
 		return engine.IsTimePaused()
 	}, engine.HeroHasActiveMovement)
 	go func() {

backend/internal/game/engine.go

@@ -995,7 +995,7 @@ func (e *Engine) ApplyAdminHeroSnapshot(hero *model.Hero) {
 	routeAssigned := false
 	if e.roadGraph != nil && hm.State == model.StateWalking && hm.Road == nil {
 		hm.pickDestination(e.roadGraph)
-		hm.assignRoad(e.roadGraph)
+		hm.assignRoad(e.roadGraph, false)
 		routeAssigned = true
 	}
 
@@ -1070,7 +1070,7 @@ func (e *Engine) ApplyAdminHeroRevive(hero *model.Hero) {
 	routeAssigned := false
 	if hm.State == model.StateWalking && hm.Road == nil && e.roadGraph != nil {
 		hm.pickDestination(e.roadGraph)
-		hm.assignRoad(e.roadGraph)
+		hm.assignRoad(e.roadGraph, false)
 		routeAssigned = true
 	}
 
@@ -1349,7 +1349,7 @@ func (e *Engine) processMovementTick(now time.Time) {
 	}
 
 	for heroID, hm := range e.movements {
-		ProcessSingleHeroMovementTick(heroID, hm, e.roadGraph, now, e.sender, startCombat, nil, e.adventureLog, e.persistHeroAfterTownEnter)
+		ProcessSingleHeroMovementTick(heroID, hm, e.roadGraph, now, e.sender, startCombat, nil, e.adventureLog, e.persistHeroAfterTownEnter, nil)
 		if e.heroStore == nil || hm == nil || hm.Hero == nil {
 			continue
 		}

backend/internal/game/movement.go

@@ -79,8 +79,18 @@ type HeroMovement struct {
 	TownNPCWalkStart    time.Time // when walk began
 	TownNPCWalkArrive   time.Time // when hero reaches NPC
 
-	// TownLeaveAt: after all town NPCs are visited (queue empty), leave only once now >= TownLeaveAt (TownNPCVisitTownPause).
+	// TownLeaveAt: after NPC tour at town center — wait/rest deadline before LeaveTown (also used for NPC-less town rest end).
 	TownLeaveAt time.Time
+	// TownPlazaHealActive: during TownLeaveAt after NPC tour, apply town HP regen (full rest roll succeeded).
+	TownPlazaHealActive bool
+
+	// TownCenterWalk*: walk from last NPC stand back to town center before road snap (avoids teleport to road spine).
+	TownCenterWalkArrive time.Time
+	TownCenterWalkStart  time.Time
+	TownCenterWalkFromX  float64
+	TownCenterWalkFromY  float64
+	TownCenterWalkToX    float64
+	TownCenterWalkToY    float64
 
 	// Accumulates fractional town-rest regen between ticks.
 	TownRestHealRemainder float64
@@ -188,7 +198,7 @@ func NewHeroMovement(hero *model.Hero, graph *RoadGraph, now time.Time) *HeroMov
 			if hm.DestinationTownID == 0 {
 				hm.pickDestination(graph)
 			}
-			hm.assignRoad(graph)
+			hm.assignRoad(graph, false)
 			if hm.Excursion.Active() && hm.Road != nil && hm.Excursion.RoadFreezeWaypoint < len(hm.Road.Waypoints)-1 {
 				hm.WaypointIndex = hm.Excursion.RoadFreezeWaypoint
 				hm.WaypointFraction = hm.Excursion.RoadFreezeFraction
@@ -206,10 +216,10 @@ func NewHeroMovement(hero *model.Hero, graph *RoadGraph, now time.Time) *HeroMov
 	if hm.DestinationTownID == 0 {
 		hm.pickDestination(graph)
 	}
-	hm.assignRoad(graph)
+	hm.assignRoad(graph, false)
 	if hm.Road == nil {
 		hm.pickDestination(graph)
-		hm.assignRoad(graph)
+		hm.assignRoad(graph, false)
 	}
 	hm.State = model.StateWalking
 
@@ -361,7 +371,9 @@ func (hm *HeroMovement) pickDestination(graph *RoadGraph) {
 
 // assignRoad finds and configures the road from CurrentTownID to DestinationTownID.
 // If no road exists (hero is mid-road), it finds the nearest town and routes from there.
-func (hm *HeroMovement) assignRoad(graph *RoadGraph) {
+// startAtFirstWaypoint: place hero at jittered waypoint 0 (departure town) without nearest-point snap —
+// use when leaving town so an off-road NPC position does not snap to an arbitrary polyline point.
+func (hm *HeroMovement) assignRoad(graph *RoadGraph, startAtFirstWaypoint bool) {
 	road := graph.FindRoad(hm.CurrentTownID, hm.DestinationTownID)
 	if road == nil {
 		// Try finding a road from any nearby town.
@@ -409,6 +421,12 @@ func (hm *HeroMovement) assignRoad(graph *RoadGraph) {
 		hm.WaypointIndex = 0
 		hm.WaypointFraction = 0
 		hm.spawnAtRoadStart = false
+	} else if startAtFirstWaypoint {
+		wp0 := jitteredRoad.Waypoints[0]
+		hm.CurrentX = wp0.X
+		hm.CurrentY = wp0.Y
+		hm.WaypointIndex = 0
+		hm.WaypointFraction = 0
 	} else {
 		// Restore progress along this hero's jittered polyline from saved world position.
 		hm.snapProgressToNearestPointOnRoad()
@@ -479,6 +497,8 @@ func (hm *HeroMovement) ShiftGameDeadlines(d time.Duration, now time.Time) {
 	hm.NextTownNPCRollAt = shift(hm.NextTownNPCRollAt)
 	hm.TownVisitStartedAt = shift(hm.TownVisitStartedAt)
 	hm.TownLeaveAt = shift(hm.TownLeaveAt)
+	hm.TownCenterWalkStart = shift(hm.TownCenterWalkStart)
+	hm.TownCenterWalkArrive = shift(hm.TownCenterWalkArrive)
 	hm.WanderingMerchantDeadline = shift(hm.WanderingMerchantDeadline)
 	hm.Excursion.StartedAt = shift(hm.Excursion.StartedAt)
 	hm.Excursion.OutUntil = shift(hm.Excursion.OutUntil)
@@ -726,6 +746,9 @@ func (hm *HeroMovement) AdminStartRest(now time.Time, graph *RoadGraph) bool {
 	hm.TownVisitLogsEmitted = 0
 	hm.TownRestHealRemainder = 0
 	hm.clearNPCWalk()
+	hm.clearTownCenterWalk()
+	hm.TownPlazaHealActive = false
+	hm.TownLeaveAt = time.Time{}
 	if graph != nil && hm.CurrentTownID == 0 {
 		hm.CurrentTownID = graph.NearestTown(hm.CurrentX, hm.CurrentY)
 	}
@@ -858,6 +881,8 @@ func (hm *HeroMovement) EnterTown(now time.Time, graph *RoadGraph) {
 	hm.ActiveRestKind = model.RestKindNone
 	hm.RestHealRemainder = 0
 	hm.clearNPCWalk()
+	hm.clearTownCenterWalk()
+	hm.TownPlazaHealActive = false
 
 	ids := graph.TownNPCIDs(destID)
 	if len(ids) == 0 {
@@ -892,12 +917,15 @@ func (hm *HeroMovement) LeaveTown(graph *RoadGraph, now time.Time) {
 	hm.RestHealRemainder = 0
 	hm.Excursion = model.ExcursionSession{}
 	hm.clearNPCWalk()
+	hm.clearTownCenterWalk()
+	hm.TownPlazaHealActive = false
 	hm.State = model.StateWalking
 	hm.Hero.State = model.StateWalking
 	// Prevent a huge movement step on the first tick after town: AdvanceTick uses now - LastMoveTick.
 	hm.LastMoveTick = now
 	hm.pickDestination(graph)
-	hm.assignRoad(graph)
+	// Start exactly at the road origin (current town); snap from an NPC-tile would jump to the wrong spine point.
+	hm.assignRoad(graph, true)
 	hm.refreshSpeed(now)
 }
 
@@ -947,6 +975,15 @@ func (hm *HeroMovement) clearNPCWalk() {
 	hm.TownNPCWalkArrive = time.Time{}
 }
 
+func (hm *HeroMovement) clearTownCenterWalk() {
+	hm.TownCenterWalkArrive = time.Time{}
+	hm.TownCenterWalkStart = time.Time{}
+	hm.TownCenterWalkFromX = 0
+	hm.TownCenterWalkFromY = 0
+	hm.TownCenterWalkToX = 0
+	hm.TownCenterWalkToY = 0
+}
+
 // StartFighting pauses movement for combat.
 func (hm *HeroMovement) StartFighting() {
 	hm.State = model.StateFighting
@@ -1096,6 +1133,21 @@ func (hm *HeroMovement) townPauseBlob() *model.TownPausePersisted {
 			t := hm.TownVisitStartedAt
 			p.TownVisitStartedAt = &t
 		}
+		if hm.TownPlazaHealActive {
+			p.TownPlazaHealActive = true
+		}
+		p.CenterWalkFromX = hm.TownCenterWalkFromX
+		p.CenterWalkFromY = hm.TownCenterWalkFromY
+		p.CenterWalkToX = hm.TownCenterWalkToX
+		p.CenterWalkToY = hm.TownCenterWalkToY
+		if !hm.TownCenterWalkStart.IsZero() {
+			t := hm.TownCenterWalkStart
+			p.CenterWalkStart = &t
+		}
+		if !hm.TownCenterWalkArrive.IsZero() {
+			t := hm.TownCenterWalkArrive
+			p.CenterWalkArrive = &t
+		}
 	}
 
 	// Persist active excursion session regardless of hero state (the hero can be fighting
@@ -1183,6 +1235,17 @@ func (hm *HeroMovement) applyTownPauseFromHero(hero *model.Hero, now time.Time)
 		if blob.NPCWalkArrive != nil {
 			hm.TownNPCWalkArrive = *blob.NPCWalkArrive
 		}
+		hm.TownPlazaHealActive = blob.TownPlazaHealActive
+		hm.TownCenterWalkFromX = blob.CenterWalkFromX
+		hm.TownCenterWalkFromY = blob.CenterWalkFromY
+		hm.TownCenterWalkToX = blob.CenterWalkToX
+		hm.TownCenterWalkToY = blob.CenterWalkToY
+		if blob.CenterWalkStart != nil {
+			hm.TownCenterWalkStart = *blob.CenterWalkStart
+		}
+		if blob.CenterWalkArrive != nil {
+			hm.TownCenterWalkArrive = *blob.CenterWalkArrive
+		}
 	}
 
 	// Restore excursion session from blob (may exist alongside any hero state).
@@ -1275,6 +1338,10 @@ type MerchantEncounterHook func(hm *HeroMovement, now time.Time, cost int64)
 // AfterTownEnterPersist runs after SyncToHero when the hero arrives in town by walking (not nil = persist to DB).
 type AfterTownEnterPersist func(hero *model.Hero)
 
+// TownNPCOfflineInteractHook runs when the hero reaches a town NPC with no WS client (offline catch-up).
+// Returns true if the hero stops and interacts (narration + timed logs); false if they walk past without stopping.
+type TownNPCOfflineInteractHook func(heroID int64, hm *HeroMovement, graph *RoadGraph, npc TownNPC, now time.Time, adventureLog AdventureLogWriter) bool
+
 func emitTownNPCVisitLogs(heroID int64, hm *HeroMovement, now time.Time, log AdventureLogWriter) {
 	if log == nil || hm.TownVisitStartedAt.IsZero() {
 		return
@@ -1606,6 +1673,7 @@ func randomDurationBetweenMs(minMs, maxMs int64) time.Duration {
 // onEncounter is required for walking encounter rolls; if nil, encounters are not triggered.
 // adventureLog may be nil; when set, town NPC visits append timed lines (per NPC narration block).
 // persistAfterTownEnter, if non-nil, is invoked after SyncToHero when the hero has just reached a town.
+// townNPCOfflineInteract, when sender is nil, decides offline buy/heal/quest vs walking past; nil uses legacy auto-sell-only behavior.
 func ProcessSingleHeroMovementTick(
 	heroID int64,
 	hm *HeroMovement,
@@ -1616,6 +1684,7 @@ func ProcessSingleHeroMovementTick(
 	onMerchantEncounter MerchantEncounterHook,
 	adventureLog AdventureLogWriter,
 	persistAfterTownEnter AfterTownEnterPersist,
+	townNPCOfflineInteract TownNPCOfflineInteractHook,
 ) {
 	if graph == nil {
 		return
@@ -1722,8 +1791,56 @@ func ProcessSingleHeroMovementTick(
 
 	case model.StateInTown:
 		cfg := tuning.Get()
+		dtTown := now.Sub(hm.LastMoveTick).Seconds()
+		if dtTown <= 0 {
+			dtTown = movementTickRate().Seconds()
+		}
 		hm.LastMoveTick = now
 
+		// --- Walk back to town center after last NPC (avoids road-snap teleport) ---
+		if !hm.TownCenterWalkArrive.IsZero() {
+			if !now.Before(hm.TownCenterWalkArrive) {
+				hm.CurrentX = hm.TownCenterWalkToX
+				hm.CurrentY = hm.TownCenterWalkToY
+				hm.clearTownCenterWalk()
+				if sender != nil {
+					sender.SendToHero(heroID, "hero_move", model.HeroMovePayload{
+						X: hm.CurrentX, Y: hm.CurrentY,
+						TargetX: hm.CurrentX, TargetY: hm.CurrentY,
+						Speed: 0, Heading: 0,
+					})
+				}
+			} else {
+				totalMs := hm.TownCenterWalkArrive.Sub(hm.TownCenterWalkStart).Milliseconds()
+				if totalMs <= 0 {
+					totalMs = 1
+				}
+				elapsed := now.Sub(hm.TownCenterWalkStart).Milliseconds()
+				t := float64(elapsed) / float64(totalMs)
+				if t > 1 {
+					t = 1
+				}
+				hm.CurrentX = hm.TownCenterWalkFromX + (hm.TownCenterWalkToX-hm.TownCenterWalkFromX)*t
+				hm.CurrentY = hm.TownCenterWalkFromY + (hm.TownCenterWalkToY-hm.TownCenterWalkFromY)*t
+				if sender != nil {
+					walkSpeed := cfg.TownNPCWalkSpeed
+					if walkSpeed <= 0 {
+						walkSpeed = tuning.DefaultValues().TownNPCWalkSpeed
+					}
+					dx := hm.TownCenterWalkToX - hm.CurrentX
+					dy := hm.TownCenterWalkToY - hm.CurrentY
+					heading := math.Atan2(dy, dx)
+					sender.SendToHero(heroID, "hero_move", model.HeroMovePayload{
+						X: hm.CurrentX, Y: hm.CurrentY,
+						TargetX: hm.TownCenterWalkToX, TargetY: hm.TownCenterWalkToY,
+						Speed: walkSpeed, Heading: heading,
+					})
+				}
+			}
+			hm.SyncToHero()
+			return
+		}
+
 		// --- Sub-state: hero is walking toward an NPC inside the town ---
 		if hm.TownNPCWalkTargetID != 0 {
 			if !now.Before(hm.TownNPCWalkArrive) {
@@ -1736,24 +1853,31 @@ func ProcessSingleHeroMovementTick(
 				hm.clearNPCWalk()
 
 				if npc, ok := graph.NPCByID[npcID]; ok {
+					fullVisit := false
 					if sender != nil {
 						sender.SendToHero(heroID, "town_npc_visit", model.TownNPCVisitPayload{
 							NPCID: npc.ID, Name: npc.Name, Type: npc.Type, TownID: hm.CurrentTownID,
 							WorldX: standX, WorldY: standY,
 						})
-						// Snap client interpolation to the NPC tile (visit message alone left the
-						// hero short of the last hero_move segment).
 						sender.SendToHero(heroID, "hero_move", model.HeroMovePayload{
 							X: hm.CurrentX, Y: hm.CurrentY,
 							TargetX: hm.CurrentX, TargetY: hm.CurrentY,
 							Speed: 0, Heading: 0,
 						})
+						fullVisit = true
+					} else if townNPCOfflineInteract != nil {
+						fullVisit = townNPCOfflineInteract(heroID, hm, graph, npc, now, adventureLog)
+					} else {
+						fullVisit = true
 					}
+
+					if fullVisit {
 						hm.TownVisitNPCName = npc.Name
 						hm.TownVisitNPCType = npc.Type
 						hm.TownVisitStartedAt = now
 						hm.TownVisitLogsEmitted = 0
-					if npc.Type == "merchant" {
+						legacyMerchantSell := npc.Type == "merchant" && (sender != nil || townNPCOfflineInteract == nil)
+						if legacyMerchantSell {
 							share := cfg.MerchantTownAutoSellShare
 							if share <= 0 || share > 1 {
 								share = tuning.DefaultValues().MerchantTownAutoSellShare
@@ -1764,8 +1888,16 @@ func ProcessSingleHeroMovementTick(
 							}
 						}
 						emitTownNPCVisitLogs(heroID, hm, now, adventureLog)
+						hm.NextTownNPCRollAt = now.Add(townNPCLogInterval() * (townNPCVisitLogLines - 1))
+					} else {
+						if adventureLog != nil {
+							adventureLog(heroID, fmt.Sprintf("You notice %s but decide not to stop.", npc.Name))
 						}
+						hm.NextTownNPCRollAt = now.Add(time.Duration(cfg.TownNPCRetryMs) * time.Millisecond)
+					}
+				} else {
 					hm.NextTownNPCRollAt = now.Add(townNPCLogInterval() * (townNPCVisitLogLines - 1))
+				}
 			} else {
 				// Still walking — interpolate position.
 				totalMs := hm.TownNPCWalkArrive.Sub(hm.TownNPCWalkStart).Milliseconds()
@@ -1808,14 +1940,80 @@ func ProcessSingleHeroMovementTick(
 		emitTownNPCVisitLogs(heroID, hm, now, adventureLog)
 
 		if len(hm.TownNPCQueue) == 0 && hm.TownNPCWalkTargetID == 0 {
+			town := graph.Towns[hm.CurrentTownID]
+			if town == nil {
+				hm.LeaveTown(graph, now)
+				hm.SyncToHero()
+				if sender != nil {
+					sender.SendToHero(heroID, "town_exit", model.TownExitPayload{})
+					if route := hm.RoutePayload(); route != nil {
+						sender.SendToHero(heroID, "route_assigned", route)
+					}
+				}
+				return
+			}
+			cx, cy := town.WorldX, town.WorldY
+			const plazaEps = 0.55
+			dPlaza := math.Hypot(hm.CurrentX-cx, hm.CurrentY-cy)
+			if dPlaza > plazaEps {
+				dx := cx - hm.CurrentX
+				dy := cy - hm.CurrentY
+				dist := math.Sqrt(dx*dx + dy*dy)
+				walkSpeed := cfg.TownNPCWalkSpeed
+				if walkSpeed <= 0 {
+					walkSpeed = tuning.DefaultValues().TownNPCWalkSpeed
+				}
+				const minWalkMs = 300
+				walkDur := time.Duration(dist/walkSpeed*1000) * time.Millisecond
+				if walkDur < minWalkMs*time.Millisecond {
+					walkDur = minWalkMs * time.Millisecond
+				}
+				hm.TownCenterWalkFromX = hm.CurrentX
+				hm.TownCenterWalkFromY = hm.CurrentY
+				hm.TownCenterWalkToX = cx
+				hm.TownCenterWalkToY = cy
+				hm.TownCenterWalkStart = now
+				hm.TownCenterWalkArrive = now.Add(walkDur)
+				if sender != nil {
+					heading := math.Atan2(dy, dx)
+					sender.SendToHero(heroID, "hero_move", model.HeroMovePayload{
+						X: hm.CurrentX, Y: hm.CurrentY,
+						TargetX: cx, TargetY: cy,
+						Speed: walkSpeed, Heading: heading,
+					})
+				}
+				hm.SyncToHero()
+				return
+			}
 			if hm.TownLeaveAt.IsZero() {
+				restCh := cfg.TownAfterNPCRestChance
+				if restCh <= 0 {
+					restCh = tuning.DefaultValues().TownAfterNPCRestChance
+				}
+				if restCh > 1 {
+					restCh = 1
+				}
+				if rand.Float64() < restCh {
+					hm.TownPlazaHealActive = true
+					hm.TownLeaveAt = now.Add(randomRestDuration())
+				} else {
+					hm.TownPlazaHealActive = false
 					hm.TownLeaveAt = now.Add(time.Duration(cfg.TownNPCPauseMs) * time.Millisecond)
 				}
+			}
+			if hm.TownPlazaHealActive {
+				hm.applyTownRestHeal(dtTown)
+			}
 			if now.Before(hm.TownLeaveAt) {
+				if sender != nil && hm.Hero != nil {
+					sender.SendToHero(heroID, "hero_state", hm.Hero)
+					sender.SendToHero(heroID, "hero_move", hm.MovePayload(now))
+				}
 				hm.SyncToHero()
 				return
 			}
 			hm.TownLeaveAt = time.Time{}
+			hm.TownPlazaHealActive = false
 			hm.LeaveTown(graph, now)
 			hm.SyncToHero()
 			if sender != nil {
@@ -1830,7 +2028,23 @@ func ProcessSingleHeroMovementTick(
 			hm.SyncToHero()
 			return
 		}
-		if rand.Float64() < cfg.TownNPCVisitChance {
+		if rand.Float64() >= cfg.TownNPCVisitChance {
+			hm.NextTownNPCRollAt = now.Add(time.Duration(cfg.TownNPCRetryMs) * time.Millisecond)
+			hm.SyncToHero()
+			return
+		}
+		approachCh := cfg.TownNPCApproachChance
+		if approachCh <= 0 {
+			approachCh = tuning.DefaultValues().TownNPCApproachChance
+		}
+		if approachCh > 1 {
+			approachCh = 1
+		}
+		if rand.Float64() >= approachCh {
+			hm.NextTownNPCRollAt = now.Add(time.Duration(cfg.TownNPCRetryMs) * time.Millisecond)
+			hm.SyncToHero()
+			return
+		}
 		npcID := hm.TownNPCQueue[0]
 		hm.TownNPCQueue = hm.TownNPCQueue[1:]
 		if npc, ok := graph.NPCByID[npcID]; ok {
@@ -1874,9 +2088,6 @@ func ProcessSingleHeroMovementTick(
 			}
 		}
 		hm.NextTownNPCRollAt = now.Add(townNPCLogInterval() * (townNPCVisitLogLines - 1))
-		} else {
-			hm.NextTownNPCRollAt = now.Add(time.Duration(cfg.TownNPCRetryMs) * time.Millisecond)
-		}
 		hm.SyncToHero()
 
 	case model.StateWalking:
@@ -1885,7 +2096,7 @@ func ProcessSingleHeroMovementTick(
 		if hadNoRoad {
 			hm.Road = nil
 			hm.pickDestination(graph)
-			hm.assignRoad(graph)
+			hm.assignRoad(graph, false)
 			if sender != nil && hm.Road != nil && len(hm.Road.Waypoints) >= 2 {
 				if route := hm.RoutePayload(); route != nil {
 					sender.SendToHero(heroID, "route_assigned", route)

backend/internal/game/offline.go

@@ -19,6 +19,7 @@ import (
 type OfflineSimulator struct {
 	store      *storage.HeroStore
 	logStore   *storage.LogStore
+	questStore *storage.QuestStore
 	graph      *RoadGraph
 	interval time.Duration
 	logger   *slog.Logger
@@ -32,10 +33,11 @@ type OfflineSimulator struct {
 // NewOfflineSimulator creates a new OfflineSimulator that ticks every 30 seconds.
 // isPaused may be nil; if it returns true, offline catch-up is skipped (aligned with engine pause).
 // skipIfLive may be nil; if it returns true for a hero id, that hero is skipped this tick.
-func NewOfflineSimulator(store *storage.HeroStore, logStore *storage.LogStore, graph *RoadGraph, logger *slog.Logger, isPaused func() bool, skipIfLive func(heroID int64) bool) *OfflineSimulator {
+func NewOfflineSimulator(store *storage.HeroStore, logStore *storage.LogStore, questStore *storage.QuestStore, graph *RoadGraph, logger *slog.Logger, isPaused func() bool, skipIfLive func(heroID int64) bool) *OfflineSimulator {
 	return &OfflineSimulator{
 		store:      store,
 		logStore:   logStore,
+		questStore: questStore,
 		graph:      graph,
 		interval:   30 * time.Second,
 		logger:     logger,
@@ -148,6 +150,7 @@ func (s *OfflineSimulator) simulateHeroTick(ctx context.Context, hero *model.Her
 
 	const maxOfflineMovementSteps = 200000
 	step := 0
+	offlineNPC := s.offlineTownNPCInteractHook(ctx)
 	for hm.LastMoveTick.Before(now) && step < maxOfflineMovementSteps {
 		step++
 		next := hm.LastMoveTick.Add(movementTickRate())
@@ -165,7 +168,7 @@ func (s *OfflineSimulator) simulateHeroTick(ctx context.Context, hero *model.Her
 		adventureLog := func(heroID int64, msg string) {
 			s.addLog(ctx, heroID, msg)
 		}
-		ProcessSingleHeroMovementTick(hero.ID, hm, s.graph, next, nil, encounter, onMerchant, adventureLog, nil)
+		ProcessSingleHeroMovementTick(hero.ID, hm, s.graph, next, nil, encounter, onMerchant, adventureLog, nil, offlineNPC)
 		if hm.Hero.State == model.StateDead || hm.Hero.HP <= 0 {
 			break
 		}
@@ -184,6 +187,103 @@ func (s *OfflineSimulator) simulateHeroTick(ctx context.Context, hero *model.Her
 	return nil
 }
 
+func (s *OfflineSimulator) offlineTownNPCInteractHook(ctx context.Context) TownNPCOfflineInteractHook {
+	return func(heroID int64, hm *HeroMovement, graph *RoadGraph, npc TownNPC, now time.Time, al AdventureLogWriter) bool {
+		return s.applyOfflineTownNPCVisit(ctx, heroID, hm, graph, npc, now, al)
+	}
+}
+
+// applyOfflineTownNPCVisit rolls TownNPCInteractChance; on success simulates merchant / healer / quest-giver actions (no UI).
+func (s *OfflineSimulator) applyOfflineTownNPCVisit(ctx context.Context, heroID int64, hm *HeroMovement, graph *RoadGraph, npc TownNPC, now time.Time, al AdventureLogWriter) bool {
+	_ = graph
+	_ = now
+	cfg := tuning.Get()
+	inter := cfg.TownNPCInteractChance
+	if inter <= 0 {
+		inter = tuning.DefaultValues().TownNPCInteractChance
+	}
+	if inter > 1 {
+		inter = 1
+	}
+	if rand.Float64() >= inter {
+		return false
+	}
+	h := hm.Hero
+	if h == nil {
+		return false
+	}
+	switch npc.Type {
+	case "merchant":
+		share := cfg.MerchantTownAutoSellShare
+		if share <= 0 || share > 1 {
+			share = tuning.DefaultValues().MerchantTownAutoSellShare
+		}
+		soldItems, soldGold := AutoSellRandomInventoryShare(h, share, nil)
+		if soldItems > 0 && al != nil {
+			al(heroID, fmt.Sprintf("Sold %d item(s) to %s for %d gold.", soldItems, npc.Name, soldGold))
+		}
+		potionCost, _ := tuning.EffectiveNPCShopCosts()
+		if potionCost > 0 && h.Gold >= potionCost && rand.Float64() < 0.55 {
+			h.Gold -= potionCost
+			h.Potions++
+			if al != nil {
+				al(heroID, fmt.Sprintf("Purchased a Healing Potion from %s.", npc.Name))
+			}
+		}
+	case "healer":
+		_, healCost := tuning.EffectiveNPCShopCosts()
+		if h.HP < h.MaxHP && healCost > 0 && h.Gold >= healCost {
+			h.Gold -= healCost
+			h.HP = h.MaxHP
+			if al != nil {
+				al(heroID, fmt.Sprintf("Paid %s to restore full health.", npc.Name))
+			}
+		}
+	case "quest_giver":
+		if s.questStore == nil {
+			return true
+		}
+		hqs, err := s.questStore.ListHeroQuests(ctx, heroID)
+		if err != nil {
+			s.logger.Warn("offline town npc: list hero quests", "error", err)
+			return true
+		}
+		taken := make(map[int64]struct{}, len(hqs))
+		for _, hq := range hqs {
+			taken[hq.QuestID] = struct{}{}
+		}
+		offered, err := s.questStore.ListQuestsByNPCForHeroLevel(ctx, npc.ID, h.Level)
+		if err != nil {
+			s.logger.Warn("offline town npc: list quests by npc", "error", err)
+			return true
+		}
+		var candidates []model.Quest
+		for _, q := range offered {
+			if _, ok := taken[q.ID]; !ok {
+				candidates = append(candidates, q)
+			}
+		}
+		if len(candidates) == 0 {
+			if al != nil {
+				al(heroID, fmt.Sprintf("Checked in with %s — nothing new.", npc.Name))
+			}
+			return true
+		}
+		pick := candidates[rand.Intn(len(candidates))]
+		ok, err := s.questStore.TryAcceptQuest(ctx, heroID, pick.ID)
+		if err != nil {
+			s.logger.Warn("offline town npc: try accept quest", "error", err)
+			return true
+		}
+		if ok && al != nil {
+			al(heroID, fmt.Sprintf("Accepted quest: %s", pick.Title))
+		}
+	default:
+		// Other NPC types: treat as a social stop only.
+	}
+	return true
+}
+
 // addLog is a fire-and-forget helper that writes an adventure log entry.
 func (s *OfflineSimulator) addLog(ctx context.Context, heroID int64, message string) {
 	logCtx, cancel := context.WithTimeout(ctx, 2*time.Second)

backend/internal/game/rest_test.go

@@ -63,7 +63,7 @@ func TestRoadsideRest_TriggersOnLowHP(t *testing.T) {
 	hm.State = model.StateWalking
 	hm.Hero.State = model.StateWalking
 
-	ProcessSingleHeroMovementTick(hero.ID, hm, graph, now, nil, nil, nil, nil, nil)
+	ProcessSingleHeroMovementTick(hero.ID, hm, graph, now, nil, nil, nil, nil, nil, nil)
 
 	if hm.State != model.StateResting {
 		t.Fatalf("expected StateResting, got %s", hm.State)
@@ -89,7 +89,7 @@ func TestRoadsideRest_DoesNotTriggerAboveThreshold(t *testing.T) {
 	hm.Hero.State = model.StateWalking
 	hm.LastEncounterAt = now
 
-	ProcessSingleHeroMovementTick(hero.ID, hm, graph, now.Add(time.Second), nil, nil, nil, nil, nil)
+	ProcessSingleHeroMovementTick(hero.ID, hm, graph, now.Add(time.Second), nil, nil, nil, nil, nil, nil)
 
 	if hm.State == model.StateResting && hm.ActiveRestKind == model.RestKindRoadside {
 		t.Fatal("should not trigger roadside rest above threshold")
@@ -107,7 +107,7 @@ func TestRoadsideRest_HealsHP(t *testing.T) {
 
 	hpBefore := hm.Hero.HP
 	tick := now.Add(10 * time.Second)
-	ProcessSingleHeroMovementTick(hero.ID, hm, graph, tick, nil, nil, nil, nil, nil)
+	ProcessSingleHeroMovementTick(hero.ID, hm, graph, tick, nil, nil, nil, nil, nil, nil)
 
 	if hm.Hero.HP <= hpBefore {
 		t.Fatalf("expected HP to increase from %d, got %d", hpBefore, hm.Hero.HP)
@@ -128,14 +128,14 @@ func TestRoadsideRest_ExitsByTimer(t *testing.T) {
 	hm.beginRoadsideRest(now)
 
 	pastTimer := hm.RestUntil.Add(time.Second)
-	ProcessSingleHeroMovementTick(hero.ID, hm, graph, pastTimer, nil, nil, nil, nil, nil)
+	ProcessSingleHeroMovementTick(hero.ID, hm, graph, pastTimer, nil, nil, nil, nil, nil, nil)
 
 	if hm.Excursion.Phase != model.ExcursionReturn {
 		t.Fatalf("expected Return phase after rest timer, got %s", hm.Excursion.Phase)
 	}
 
 	pastReturn := hm.Excursion.ReturnUntil.Add(time.Second)
-	ProcessSingleHeroMovementTick(hero.ID, hm, graph, pastReturn, nil, nil, nil, nil, nil)
+	ProcessSingleHeroMovementTick(hero.ID, hm, graph, pastReturn, nil, nil, nil, nil, nil, nil)
 
 	if hm.State != model.StateWalking {
 		t.Fatalf("expected StateWalking after return, got %s (rest kind: %s)", hm.State, hm.ActiveRestKind)
@@ -153,7 +153,7 @@ func TestRoadsideRest_ExitsByHPThreshold(t *testing.T) {
 
 	// Tick past the Out phase so the hero is in Wild phase where HP threshold is checked.
 	tick := hm.Excursion.OutUntil.Add(time.Second)
-	ProcessSingleHeroMovementTick(hero.ID, hm, graph, tick, nil, nil, nil, nil, nil)
+	ProcessSingleHeroMovementTick(hero.ID, hm, graph, tick, nil, nil, nil, nil, nil, nil)
 
 	if hm.Excursion.Phase != model.ExcursionReturn {
 		t.Fatalf("expected excursion Return phase after HP threshold exit, got %s", hm.Excursion.Phase)
@@ -192,7 +192,7 @@ func TestAdventureInlineRest_TriggersOnLowHP(t *testing.T) {
 	hm.beginExcursion(now)
 
 	tick := hm.Excursion.OutUntil.Add(time.Second)
-	ProcessSingleHeroMovementTick(hero.ID, hm, graph, tick, nil, nil, nil, nil, nil)
+	ProcessSingleHeroMovementTick(hero.ID, hm, graph, tick, nil, nil, nil, nil, nil, nil)
 
 	if hm.State != model.StateResting {
 		t.Fatalf("expected StateResting, got %s", hm.State)
@@ -218,7 +218,7 @@ func TestAdventureInlineRest_HealsHP(t *testing.T) {
 
 	hpBefore := hm.Hero.HP
 	tick := now.Add(10 * time.Second)
-	ProcessSingleHeroMovementTick(hero.ID, hm, graph, tick, nil, nil, nil, nil, nil)
+	ProcessSingleHeroMovementTick(hero.ID, hm, graph, tick, nil, nil, nil, nil, nil, nil)
 
 	if hm.Hero.HP <= hpBefore {
 		t.Fatalf("expected HP to increase from %d, got %d", hpBefore, hm.Hero.HP)
@@ -243,7 +243,7 @@ func TestAdventureInlineRest_ExitsByHPTarget(t *testing.T) {
 	hm.beginAdventureInlineRest(now)
 
 	tick := now.Add(time.Second)
-	ProcessSingleHeroMovementTick(hero.ID, hm, graph, tick, nil, nil, nil, nil, nil)
+	ProcessSingleHeroMovementTick(hero.ID, hm, graph, tick, nil, nil, nil, nil, nil, nil)
 
 	if hm.State != model.StateWalking {
 		t.Fatalf("expected StateWalking after HP target, got %s", hm.State)
@@ -263,7 +263,7 @@ func TestAdventureInlineRest_ExitsByExcursionEnd(t *testing.T) {
 	hm.beginAdventureInlineRest(now)
 
 	pastReturn := hm.Excursion.ReturnUntil.Add(time.Second)
-	ProcessSingleHeroMovementTick(hero.ID, hm, graph, pastReturn, nil, nil, nil, nil, nil)
+	ProcessSingleHeroMovementTick(hero.ID, hm, graph, pastReturn, nil, nil, nil, nil, nil, nil)
 
 	if hm.State != model.StateWalking {
 		t.Fatalf("expected StateWalking after excursion end, got %s", hm.State)
@@ -566,7 +566,7 @@ func TestExcursion_FreezesRoadWaypointDuringSession(t *testing.T) {
 	wildMid := hm.Excursion.OutUntil.Add(hm.Excursion.WildUntil.Sub(hm.Excursion.OutUntil) / 2)
 	for i := 0; i < 5; i++ {
 		tick := wildMid.Add(time.Duration(i) * time.Second)
-		ProcessSingleHeroMovementTick(hero.ID, hm, graph, tick, nil, nil, nil, nil, nil)
+		ProcessSingleHeroMovementTick(hero.ID, hm, graph, tick, nil, nil, nil, nil, nil, nil)
 		if hm.Excursion.Phase == model.ExcursionNone {
 			t.Fatalf("excursion ended unexpectedly at tick %v", tick)
 		}
@@ -591,7 +591,7 @@ func TestLowHP_DoesNotStartRestWhileFighting(t *testing.T) {
 	hm.State = model.StateFighting
 	hm.Hero.State = model.StateFighting
 
-	ProcessSingleHeroMovementTick(hero.ID, hm, graph, now.Add(time.Second), nil, nil, nil, nil, nil)
+	ProcessSingleHeroMovementTick(hero.ID, hm, graph, now.Add(time.Second), nil, nil, nil, nil, nil, nil)
 
 	if hm.State != model.StateFighting {
 		t.Fatalf("expected StateFighting unchanged, got %s", hm.State)

backend/internal/model/town_pause.go

@@ -28,6 +28,15 @@ type TownPausePersisted struct {
 	NPCWalkStart    *time.Time `json:"npcWalkStart,omitempty"`
 	NPCWalkArrive   *time.Time `json:"npcWalkArrive,omitempty"`
 
+	// Plaza: walk to town center after NPC tour, then wait/rest before leaving.
+	TownPlazaHealActive bool       `json:"townPlazaHealActive,omitempty"`
+	CenterWalkFromX     float64    `json:"centerWalkFromX,omitempty"`
+	CenterWalkFromY     float64    `json:"centerWalkFromY,omitempty"`
+	CenterWalkToX       float64    `json:"centerWalkToX,omitempty"`
+	CenterWalkToY       float64    `json:"centerWalkToY,omitempty"`
+	CenterWalkStart     *time.Time `json:"centerWalkStart,omitempty"`
+	CenterWalkArrive    *time.Time `json:"centerWalkArrive,omitempty"`
+
 	// Excursion (mini-adventure) session persisted for reconnect / offline resume.
 	Excursion *ExcursionPersisted `json:"excursion,omitempty"`
 }

backend/internal/storage/quest_store.go

@@ -373,6 +373,19 @@ func (s *QuestStore) AcceptQuest(ctx context.Context, heroID int64, questID int6
 	return nil
 }
 
+// TryAcceptQuest inserts an accepted hero_quest row when none exists yet. Returns whether a row was inserted.
+func (s *QuestStore) TryAcceptQuest(ctx context.Context, heroID int64, questID int64) (bool, error) {
+	tag, err := s.pool.Exec(ctx, `
+		INSERT INTO hero_quests (hero_id, quest_id, status, progress, accepted_at)
+		VALUES ($1, $2, 'accepted', 0, now())
+		ON CONFLICT (hero_id, quest_id) DO NOTHING
+	`, heroID, questID)
+	if err != nil {
+		return false, fmt.Errorf("try accept quest: %w", err)
+	}
+	return tag.RowsAffected() > 0, nil
+}
+
 // ListHeroQuests returns all quests for the hero with their quest template joined.
 func (s *QuestStore) ListHeroQuests(ctx context.Context, heroID int64) ([]model.HeroQuest, error) {
 	rows, err := s.pool.Query(ctx, `

backend/internal/tuning/runtime.go

@@ -23,6 +23,12 @@ type Values struct {
 	TownRestHPPerS     float64 `json:"townRestHpPerSecond"`
 	TownArrivalRadius  float64 `json:"townArrivalRadius"`
 	TownNPCVisitChance float64 `json:"townNpcVisitChance"`
+	// TownNPCApproachChance: second roll after a visit timer fires — whether the hero commits to walking
+	// toward the next queued NPC. 1.0 = same as legacy (only TownNPCVisitChance gates approach).
+	TownNPCApproachChance float64 `json:"townNpcApproachChance"`
+	// TownNPCInteractChance: offline only — after reaching an NPC, probability of “using” services
+	// (buy potion, full heal, accept a quest) instead of walking past.
+	TownNPCInteractChance float64 `json:"townNpcInteractChance"`
 	TownNPCRollMinMs   int64   `json:"townNpcRollMinMs"`
 	TownNPCRollMaxMs   int64   `json:"townNpcRollMaxMs"`
 	TownNPCRetryMs     int64   `json:"townNpcRetryMs"`
@@ -31,6 +37,9 @@ type Values struct {
 	TownNPCWalkSpeed     float64 `json:"townNpcWalkSpeed"`
 	// TownNPCStandoffWorld: hero stops this many world units short of the NPC tile (along approach).
 	TownNPCStandoffWorld float64 `json:"townNpcStandoffWorld"`
+	// TownAfterNPCRestChance: after the NPC tour, at town center — probability of a full town rest
+	// (same duration/regen as towns without NPCs). Otherwise only a short TownNPCPauseMs wait.
+	TownAfterNPCRestChance float64 `json:"townAfterNpcRestChance"`
 
 	WanderingMerchantPromptTimeoutMs int64   `json:"wanderingMerchantPromptTimeoutMs"`
 	MerchantCostBase                 int64   `json:"merchantCostBase"`
@@ -212,6 +221,8 @@ func DefaultValues() Values {
 		TownRestHPPerS:          0.002,
 		TownArrivalRadius:       0.5,
 		TownNPCVisitChance:      0.78,
+		TownNPCApproachChance:   1.0,
+		TownNPCInteractChance:   0.65,
 		TownNPCRollMinMs:        800,
 		TownNPCRollMaxMs:        2600,
 		TownNPCRetryMs:          450,
@@ -219,6 +230,7 @@ func DefaultValues() Values {
 		TownNPCLogIntervalMs:    5_000,
 		TownNPCWalkSpeed:        3.0,
 		TownNPCStandoffWorld:    0.65,
+		TownAfterNPCRestChance:  0.78,
 		WanderingMerchantPromptTimeoutMs: 15_000,
 		MerchantCostBase:                 20,
 		MerchantCostPerLevel:             5,