@startuml
title User creates a Cluster with KubeadmControlPlane
actor User

' -- GROUPS START ---

box #lightgreen
participant "API Server"
end box

box #lightslategray
participant "Cluster API Cluster Controller"
end box

' -- GROUPS END ---

User->"API Server":kubectl apply -f cluster.yaml
"API Server"-->>"Cluster API Cluster Controller": New Cluster

"Cluster API Cluster Controller"-> "Cluster API Cluster Controller":Cluster Controller Reconcile
activate "Cluster API Cluster Controller"

note over "Cluster API Cluster Controller": - ✅ Cluster.Status.InfrastructureReady is false\n- ✅ Cluster.Spec.ControlPlaneRef is populated\n- ✅ Cluster.Spec.ControlPlaneRef -> Status.Ready is false

opt #FFFFFFCC Required only if the object hasn't been seen before
"Cluster API Cluster Controller"-> "Cluster API Cluster Controller":Add watcher for \nCluster.Spec.ControlPlaneRef.Kind objects
end

opt #FFFFFFCC Required only if the infrastructure object doesn't have a Cluster owner reference
"Cluster API Cluster Controller"-> "Cluster API Cluster Controller":Set Cluster.Spec.InfrastructureRef -> OwnerReferences[0] to Cluster
"Cluster API Cluster Controller"->"API Server": Patch AWSCluster
"Cluster API Cluster Controller"<<--"API Server": Response
end

opt #FFFFFFCC Required only if the control plane object doesn't have a Cluster owner reference
"Cluster API Cluster Controller"-> "Cluster API Cluster Controller":Set Cluster.Spec.ControlPlaneRef -> OwnerReferences[0] to Cluster
"Cluster API Cluster Controller"->"API Server": Patch KubeadmControlPlane
"Cluster API Cluster Controller"<<--"API Server": Response
end

"Cluster API Cluster Controller"->"API Server": Patch Cluster Status
"Cluster API Cluster Controller"<<--"API Server": Response

deactivate "Cluster API Cluster Controller"

hide footbox
@enduml