module Simulator
    use Bop
    use PumpsMain
    use RopMain
    use RotaryTableMain
    use DrawworksMain
    use FluidFlowMain
    use TorqueDragMain
    use MudSystemMain
    use PipeRams1Main
    use PipeRams2Main
    use KillLineMain
    use ChokeLineMain
    use BlindRamsMain
    use AnnularMain
    use TopDriveMain
    use GeoMain
    use COperationScenariosMain
    use :: json_module, rk => json_rk
    
    implicit none
    real              :: t0, dt, tf, mu
    real(kind=rk), allocatable :: x0(:)
    type(json_file)            :: json
    logical                    :: is_found,test
    
contains
    subroutine Simulate
        integer :: t
        !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
        t=0
        do while (t<10)
            !!read variable from shared file
            call read_variables()

            !!Location: ./bop
            !! Variables: 
            !! Nothing exist in rop_step or even ropMainBody!
            !! Tarmigh, Now merged with FluidFlow
            call Rop_Step()
            
            !!Location: ./Equipment/BopStack
            !! Rafiee, nothing changed
            call BopStack_Step()
            
            !! Location: /Equipment/Pumps
            !! Variables: 
            !! Does not have step function
            !! Call Pump_StartUp in the start
            !! Why we have a infinite loop (loop2) in step? Must be rewritten
            !! Tarmigh, now is rewritten
            call Pump1_Step()
            call Pump2_Step()
            
            !! Location ./Equipment/Rotarytable
            !! Variables: 
            !! Does not have step function            
            !! Call RTable_StartUp in the start
            !! Again has a loop in each step
            !! Tarmigh, now is rewritten
            call RotaryTable_Step()
            
            !! Location ./Equipment/Drawworks
            !! Variables: 
            !! Does not have step function            
            !! Call ..._StartUp in the start
            !! Again has a loop in each step
            !! Tarmigh, now is rewritten
            call Drawworks_Step()
            
            !! Empty nothing called
            !! Merged in FluidFlow
            call TorqueDrag_Step()
            
            !! Location: ./Equipment/MudSystem
            !! Variables: MudSystem_variables.f90 and MudSystem.f90
            !! Step function simply calls LineupAndPath in MudSystem.f90
            !! had not startUp
            !! Rafiee
            call MudSystem_Step()

            !! Location ./Equipment/BopStack
            !! Variables: VARIABLES,CBopStackVariables,CBopControlPanelVariables,CEquipmentsConstants
            !! Step function added, only call PIPE_RAMS1 and 2 function
            !! BOP_StartUp commented
            !! Rafiee
            call PipeRams1_Step()
            call PipeRams2_Step()
            
            
            !! Location ./Equipment/BopStack
            !! Variables: VARIABLES,CBopStackVariables,CBopControlPanelVariables,CEquipmentsConstants,CAccumulatorVariables,CSimulationVariables
            !! Step function added, only call PIPE_RAMS1 and 2 function
            !! BOP_StartUp commented
            !! Rafiee
            call KillLine_Step()
            
            !! Probably like other bopstack equipments
            !! Rafiee            
            call ChokeLine_Step()
            call BlindRams_Step()
            call Annular_Step()
            
            !!Tarmigh. Step must rewrittem
            call TopDrive_Step()
            
            !!Empty
            call Geo_Step()
            
            !! Sheikh
            call FluidFlow_Step()
            
            !! Ahmadi
            call OperationScenarios_Step()
            
            !! Write variables to shared files
            call write_variables()

            print *,"t=",t
            t = t + 1
        end do
    end subroutine Simulate

    subroutine write_variables
        !implicit none
    end subroutine

    subroutine read_variables
        call json%initialize()

        ! Load the file.
        call json%load_file('config.json'); if (json%failed()) stop

        call json%get('t0', t0, is_found); if (.not. is_found) return
        call json%get('dt', dt, is_found); if (.not. is_found) return
        call json%get('tf', tf, is_found); if (.not. is_found) return
        call json%get('mu', mu, is_found); if (.not. is_found) return
        call json%get('x0', x0, is_found); if (.not. is_found) return

        ! Output values.
        if (is_found) then
            print *, t0, dt, tf, mu
            print *, x0
        end if

        ! Clean up.
        call json%destroy()
    end subroutine
    
end module Simulator