@startuml
title NATS — CREATE_RESOURCE : Pair A découvre Pair B et établit le stream

participant "App Pair A (oc-api)" as AppA
participant "NATS A" as NATSA
participant "Node A" as NodeA
participant "StreamService A" as StreamA
participant "Node B" as NodeB
participant "StreamService B" as StreamB
participant "DB Pair A (oc-lib)" as DBA

note over AppA: Pair B vient d'être découvert\n(via indexeur ou manuel)

AppA -> NATSA: Publish(CREATE_RESOURCE, {\n  FromApp:"oc-api",\n  Datatype:PEER,\n  Payload: Peer B {StreamAddress_B, Relation:PARTNER}\n})

NATSA -> NodeA: ListenNATS callback → CREATE_RESOURCE

NodeA -> NodeA: resp.FromApp == "oc-discovery" ? → Non, continuer
NodeA -> NodeA: json.Unmarshal(payload) → peer.Peer B
NodeA -> NodeA: pp.AddrInfoFromString(B.StreamAddress)
note over NodeA: ad_B = {ID: PeerID_B, Addrs: [...]}

NodeA -> StreamA: Mu.Lock()

alt peer B.Relation == PARTNER
    NodeA -> StreamA: ConnectToPartner(B.StreamAddress)
    StreamA -> StreamA: AddrInfoFromString(B.StreamAddress) → ad_B
    StreamA -> NodeB: Connect (libp2p)
    StreamA -> NodeB: NewStream /opencloud/resource/heartbeat/partner/1.0
    StreamA -> NodeB: json.Encode(Heartbeat{Name_A, DID_A, PeerID_A})

    NodeB -> StreamB: HandlePartnerHeartbeat(stream)
    StreamB -> StreamB: CheckHeartbeat → bandwidth challenge
    StreamB -> StreamA: Echo(payload)
    StreamB -> StreamB: streams[ProtocolHeartbeatPartner][PeerID_A] = {DID_A, Expiry=now+10s}

    StreamA -> StreamA: streams[ProtocolHeartbeatPartner][PeerID_B] = {DID_B, Expiry=now+10s}
    note over StreamA,StreamB: Stream partner long-lived établi\ndans les deux sens
else peer B.Relation != PARTNER (révocation / blacklist)
    note over NodeA: Supprimer tous les streams vers Pair B
    loop Pour chaque protocole dans Streams
        NodeA -> StreamA: streams[proto][PeerID_B].Stream.Close()
        NodeA -> StreamA: delete(streams[proto], PeerID_B)
    end
end

NodeA -> StreamA: Mu.Unlock()
NodeA -> DBA: (pas de write direct ici — géré par l'app source)

@enduml