@startuml machine-controller-reconcile

start;

:Machine controller;

repeat
  :Reconcile;

  if (Machine has a TaskRef) then (yes)
    if (Task exists) then (yes)
      if (Task is running/pending) then (yes)
        #LightGreen:Requeue;
      elseif (Task is success/failed) then (yes)
        #edf7de:Remove TaskRef from Machine;
      endif
    else (no)
      #edf7de:Remove TaskRef from Machine;
      #LightGreen:Requeue;
    endif
  endif
  if (Is requeued or in error) then (no)
    if (Machine has a MachineRef) then (no)
      if (Can find VM by InstanceUUID) then (yes)
        #edf7de:Assign MachineRef to Machine;
      endif
    endif
    if (Machine has a MachineRef) then (no)
      if (Can find VM by MachineRef) then (no)
        #edf7de:Remove MachineRef from Machine;
      endif
    endif
    if (Machine has DeletionTimestamp) then (yes)
      if (Machine has a MachineRef) then (yes)
        #edf7de:Delete VM;
        #edf7de:Assign delete TaskRef to Machine;
        #LightGreen:Requeue;
      endif
    else (no)
      if (Machine has a MachineRef) then (yes)
        if (VM metadata matches calculated metadata) then (no)
          #edf7de:Reconfigure VM with calculated metadata;
          #edf7de:Assign reconfigure TaskRef to Machine;
          #LightGreen:Requeue;
        else (yes)
          #edf7de:Update Machine status with MAC addresses from VM;
          if (VM powered on) then (no)
            #edf7de:Power on VM;
            #edf7de:Assign power TaskRef to Machine;
            #LightGreen:Requeue;
          else (yes)
            if (VM has IP addresses) then (yes)
              #edf7de:Update Machine status with IP addresses from VM;
            else (no)
              #LightGreen:Requeue;
            endif
          endif
        endif
      else (no)
        #edf7de:Clone template to create new VM;
        #edf7de:Assign clone TaskRef to Machine;
        #LightGreen:Requeue;
      endif
    endif
  endif
  #edf7de:Machine state patched back to API server;
repeat while (Reconcile is requeued) is (yes)
-> no;
if (Error occurred) then (yes)
  #Pink:Reconcile failed;
else (no)
  #LightBlue:Reconcile success;
endif
stop;

@enduml