-- Name of the engine heater switch device
HEATERSWITCH = 'SWITCH_Fd_EngineHeater'

commandArray = {}

if (devicechanged[HEATERSWITCH]) then
   engineHeaterStatus = devicechanged[HEATERSWITCH]

   -- Get engine heater mode from user variable
   if (uservariables['EngHeat_Mode']) then
      heaterMode = uservariables['EngHeat_Mode']
   else
      heaterMode = "unknown"
      print("Warning! Cannot read user variable 'EngHeat_Mode")
   end

   if ((heaterMode == "Auto") and (engineHeaterStatus == "Off") ) then
         heaterMode = "Cancel"
         commandArray['Variable:EngHeat_Mode'] = heaterMode
   elseif ((heaterMode == "Manual") and (engineHeaterStatus == "Off")) then
         heaterMode = "Off"
         commandArray['Variable:EngHeat_Mode'] = heaterMode
   elseif ((heaterMode == "Off") and (engineHeaterStatus == "On")) then
         heaterMode = "Manual"
         commandArray['Variable:EngHeat_Mode'] = heaterMode
   elseif ((heaterMode == "Cancel") and (engineHeaterStatus == "On")) then
         heaterMode = "Manual"
         commandArray['Variable:EngHeat_Mode'] = heaterMode
   end
   print("Engine heater is set to "..engineHeaterStatus)
   print("Engine heater mode is set to "..heaterMode)
end

return commandArray