@startuml
title Figure 1. Cluster Provisioning process
actor User

' -- GROUPS START ---

box #LightGreen
participant "API Server"
end box

box #LightBlue
participant "Cluster Controller"
end box

box #LightGrey
participant "Infrastructure Controller"
end box

' -- GROUPS END ---

User -> "API Server" : Create Cluster Infrastructure
"API Server" -->> "Infrastructure Controller": New Provider Infrastructure

opt #FFFFFFCC IF Infrastructure has no owner ref
"Infrastructure Controller"->"Infrastructure Controller": Do Nothing
end

User -> "API Server": Create Cluster
"API Server" -->> "Cluster Controller": New Cluster
"Cluster Controller" -> "API Server": Get Infrastructure
opt #FFFFFFCC Required Only if Infrastructure not seen before
"Cluster Controller" -> "Cluster Controller": Add Watcher for Cluster.InfrastructureRef.Kind objects
end

opt #FFFFFFCC Required Only if Infrastructure has no owner
"Cluster Controller" -> "Cluster Controller": Set Infrastructure's owner to Cluster
"Cluster Controller" -> "API Server": Update Infrastructure
end

"API Server" -->> "Infrastructure Controller": Infrastructure update
opt #FFFFFFCC Required only if Infrastructure has owner ref
"Infrastructure Controller" -> "API Server": Get Cluster
"Infrastructure Controller" -> "Infrastructure Controller": Provision infrastructure
"Infrastructure Controller" -> "Infrastructure Controller": Set Infrastructure.Status.APIEndpoint
"Infrastructure Controller" -> "Infrastructure Controller": Set Infrastructure.Status.Ready=true
"Infrastructure Controller" -> "API Server": Update Infrastructure
end

"API Server" -->> "Cluster Controller": Infrastructure Update
opt #FFFFFFCC Only required if Infrastructure.Status.Ready is true
"Cluster Controller" -> "API Server": Get Cluster
"Cluster Controller" -> "Cluster Controller": Set Cluster.Status.APIEndpoint = Infrastructure.Status.APIEndpoint
"Cluster Controller" -> "Cluster Controller": Set Cluster.Status.InfrastructureReady true
"Cluster Controller" -> "API Server": Update Cluster
end

hide footbox
@enduml