Module RedisInterface
    ! use iso_c_binding, only: c_char
    Interface
        SUBROUTINE addnums(a, b) BIND(C,name='addnums')
            USE, INTRINSIC :: ISO_C_BINDING, ONLY: C_INT
            IMPLICIT NONE
            INTEGER(C_INT) :: a, b
        END SUBROUTINE addnums

        SUBROUTINE initConnection_C(address,port,password,datakey,status) BIND(C, name='initConnection')
            use iso_c_binding, only: c_char,c_int
            character(kind=c_char) :: address(*)
            integer(kind=c_int)::port,status
            character(kind=c_char) :: password(*),datakey(*)
        END SUBROUTINE initConnection_C
        
        SUBROUTINE setData_C(part,str) BIND(C,name='setData')
            use iso_c_binding, only: c_char
            character(kind=c_char) :: str(*)
            character(kind=c_char) :: part(*)
        END SUBROUTINE setData_C

        FUNCTION getData_C(len) BIND(C,name='getData')
            use iso_c_binding, only: c_ptr,c_int
            integer(kind=c_int)::len
            type(c_ptr) :: getData_C
        END FUNCTION getData_C

        SUBROUTINE deallocateData() BIND(C, name='deallocData')
        END SUBROUTINE deallocateData

    End Interface

    contains

    SUBROUTINE initConnection(address,port,password, datakey,status)
        use iso_c_binding, only: c_null_char,c_char
        ! use json_module
        character(len=*) :: password,address,datakey
        integer::port,status
        character(len=:),allocatable::c_address,c_password,c_datakey
        ! type(json_file)            :: jsonfile
        ! type(json_value),pointer :: jsonvalue,jsonvalue2
        ! type(json_core) :: jsoncore

        ! call jsonfile%initialize()
        ! print *,"Initilized: simulation with ",configFilename
        ! call jsonfile%load_file(configFilename);
        ! if (jsonfile%failed()) then
        !     print *,"can not open config file: ",configFilename ;
        !     stop
        ! endif
        ! ! print *,"file read"
        ! call jsonfile%json_file_get_root(jsonvalue)
        ! call jsoncore%get(jsonvalue,'redis',jsonvalue2)
        ! call jsoncore%get(jsonvalue2,"address",address);
        ! call jsoncore%get(jsonvalue2,"port",port);
        ! call jsoncore%get(jsonvalue2,"password",password);
        ! call jsoncore%get(jsonvalue2,"datakey",datakey);

        c_datakey = datakey//c_null_char
        c_password = password//c_null_char
        c_address = address//c_null_char
        call initConnection_C(c_address,port,c_password,c_datakey,status)
        ! print *,"returned to initConnection"
    END SUBROUTINE initConnection

    SUBROUTINE setData(str)
            use SimulationVariables
            use iso_c_binding, only: c_null_char
            character(len=*):: str
            character(len=len_trim(str)+1)::c_str
            character(len=4)::part
            part = "out"//c_null_char
            c_str = str//c_null_char
            if(logging>4) print *,"setting Data: ",len_trim(str)
            call setData_C(part,c_str)
    END SUBROUTINE setData

    SUBROUTINE setInput(str)
        use SimulationVariables
        use iso_c_binding, only: c_null_char
        character(len=*):: str
        character(len=len_trim(str)+1)::c_str
        character(len=4)::part
        part = "in"//c_null_char
        c_str = str//c_null_char
        if(logging>4) print *,"setting Data: ",len_trim(str)
        call setData_C(part,c_str)
    END SUBROUTINE setInput

    SUBROUTINE getData(string)
        use iso_c_binding, only: c_char,c_ptr,c_f_pointer,c_null_ptr
        ! character(:),allocatable :: getData2
        character(:),allocatable :: string
        integer :: string_shape(1)
        type(c_ptr) :: c_string
        integer::l
        l = 30000
        ! print *,"reading data l=",l
        c_string = getData_C(l)
        ! print *,"data read. l=",l 
        ! len = int(c_len,kind=kind(len))
        string_shape(1) =   l!int(l,kind=kind(Integer))
        if(.not. allocated(string)) then
            print *,"allocate string"
            allocate(character(l) :: string)
        endif
        call c_f_pointer(c_string, string, string_shape)
        c_string=c_null_ptr
        string = trim(string)
        ! print *,len_trim(string), "chars read."
        ! print *,string(1:l)
        ! getData2=string
    END SUBROUTINE getData

    ! SUBROUTINE getData2(string) !result(string)
    !     use iso_c_binding, only: c_char,c_ptr,c_f_pointer,c_null_ptr
    !     ! character(:),allocatable :: getData2
    !     character(:),allocatable :: string
    !     integer :: string_shape(1)
    !     type(c_ptr) :: c_string
    !     integer::l
    !     ! print *,"reading data (getData2)"
    !     c_string = getData_C(l)
    !     ! string = c_str
    !     ! len = int(c_len,kind=kind(len))
    !     string_shape(1) =  l! int(l,kind=kind(integer))
    !     if(.not. allocated(string)) allocate(character(l) :: string)
    !     call c_f_pointer(c_string, string, string_shape)
    !     c_string=c_null_ptr
    !     ! print *,len_trim(string), "chars read."
    !     ! print *,string(1:l)
    !     ! getData2=string
    ! END SUBROUTINE getData2

END Module RedisInterface