@startuml
participant APP as "Bulk Data Client"
box Bulk Data Provider
participant "FHIR Authorization Server" as AUTH
participant "FHIR Resource Server" as FHIR
participant "Output File Server" as FILE
end box
opt  Precondition: SMART Backend Services Registration
    APP -> AUTH: Registration
   return client_id
end
opt  Precondition: SMART Backend Services Authorization
    APP -> AUTH: Signed token request
   return Short lived token
end
APP -> FHIR: Kick-off request
activate FHIR #eee
FHIR --> APP: Status polling location
loop Check export status (repeat 1..n)
  APP -> FHIR: Status request
  FHIR --> APP: In-progress status
end
FHIR -> FILE: Generated files
deactivate FHIR
activate FILE
APP -> FHIR: Status request
FHIR --> APP: Complete status (JSON manifest)
loop Retrieve files and errors (repeat 0..n)
  APP -> FILE: Bulk Data output file request
  FILE --> APP: Bulk Data file
end
loop Retrieve attachments (repeat 0..n)
  APP -> FILE: Bulk Data attachment file request
  FILE --> APP:  Attachment file
end
deactivate FILE #eee
@enduml