sequenceDiagram
    title Stream — Session Planner : Pair A demande le plan de Pair B

    participant AppA as App Pair A (oc-booking)
    participant NATSA as NATS A
    participant NodeA as Node A
    participant StreamA as StreamService A
    participant NodeB as Node B
    participant StreamB as StreamService B
    participant DBB as DB Pair B (oc-lib)
    participant NATSB as NATS B

    %% Ouverture session planner
    AppA->>NATSA: Publish(PROPALGATION_EVENT, {PB_PLANNER, peer_id:PeerID_B, payload:{}})
    NATSA->>NodeA: ListenNATS → PB_PLANNER

    NodeA->>NodeA: Unmarshal → {peer_id: PeerID_B, payload: {}}
    NodeA->>StreamA: PublishCommon(nil, user, PeerID_B, ProtocolSendPlanner, {})
    Note over StreamA: WaitResponse=true, TTL=24h<br/>Stream long-lived vers Pair B
    StreamA->>NodeB: TempStream /opencloud/resource/planner/1.0
    StreamA->>NodeB: json.Encode(Event{Type:planner, From:DID_A, Payload:{}})

    NodeB->>StreamB: HandleResponse → readLoop(ProtocolSendPlanner)
    StreamB->>StreamB: handleEvent(ProtocolSendPlanner, evt)
    StreamB->>StreamB: sendPlanner(evt)

    alt evt.Payload vide (requête initiale)
        StreamB->>DBB: planner.GenerateShallow(AdminRequest)
        DBB-->>StreamB: plan (shallow booking plan de Pair B)
        StreamB->>StreamA: PublishCommon(nil, user, DID_A, ProtocolSendPlanner, planJSON)
        StreamA->>NodeA: json.Encode(Event{plan de B})
        NodeA->>NATSA: (forwardé à AppA via SEARCH_EVENT ou PLANNER event)
        NATSA->>AppA: Plan de Pair B
    else evt.Payload non vide (mise à jour planner)
        StreamB->>StreamB: m["peer_id"] = evt.From (DID_A)
        StreamB->>NATSB: SetNATSPub(PROPALGATION_EVENT, {PB_PLANNER, peer_id:DID_A, payload:plan})
        NATSB->>DBB: (oc-booking traite le plan sur NATS B)
    end

    %% Fermeture session planner
    AppA->>NATSA: Publish(PROPALGATION_EVENT, {PB_CLOSE_PLANNER, peer_id:PeerID_B})
    NATSA->>NodeA: ListenNATS → PB_CLOSE_PLANNER

    NodeA->>NodeA: Unmarshal → {peer_id: PeerID_B}
    NodeA->>StreamA: Mu.Lock()
    NodeA->>StreamA: Streams[ProtocolSendPlanner][PeerID_B].Stream.Close()
    NodeA->>StreamA: delete(Streams[ProtocolSendPlanner], PeerID_B)
    NodeA->>StreamA: Mu.Unlock()
    Note over StreamA,NodeB: Stream planner fermé — session terminée