local ffi = require("ffi")

local vjoy = ffi.load("vJoyInterface.dll")

ffi.cdef [[
typedef int BOOL;
typedef short SHORT;
typedef unsigned short USHORT;
typedef int INT;
typedef unsigned int UINT;
typedef long LONG;
typedef unsigned short WORD;
typedef unsigned long DWORD;

typedef void *PVOID;

typedef unsigned char UCHAR;

typedef void (__stdcall *RemovalCB)(BOOL, BOOL, PVOID);

SHORT GetvJoyVersion(void);
BOOL    vJoyEnabled(void);
PVOID   GetvJoyProductString(void);
PVOID   GetvJoyManufacturerString(void);
PVOID   GetvJoySerialNumberString(void);
BOOL    DriverMatch(WORD * DllVer, WORD * DrvVer);
void    RegisterRemovalCB(RemovalCB cb, PVOID data);
BOOL    vJoyFfbCap(BOOL * Supported);   // Is this version of vJoy capable of FFB?
BOOL    GetvJoyMaxDevices(int * n); // What is the maximum possible number of vJoy devices
BOOL    GetNumberExistingVJD(int * n);  // What is the number of vJoy devices currently enabled

enum VjdStat  /* Declares an enumeration data type */
{
    VJD_STAT_OWN,   // The  vJoy Device is owned by this application.
    VJD_STAT_FREE,  // The  vJoy Device is NOT owned by any application (including this one).
    VJD_STAT_BUSY,  // The  vJoy Device is owned by another application. It cannot be acquired by this application.
    VJD_STAT_MISS,  // The  vJoy Device is missing. It either does not exist or the driver is down.
    VJD_STAT_UNKN   // Unknown
};

/////   vJoy Device properties
int  GetVJDButtonNumber(UINT rID);  // Get the number of buttons defined in the specified VDJ
int  GetVJDDiscPovNumber(UINT rID); // Get the number of descrete-type POV hats defined in the specified VDJ
int  GetVJDContPovNumber(UINT rID); // Get the number of descrete-type POV hats defined in the specified VDJ
BOOL     GetVJDAxisExist(UINT rID, UINT Axis); // Test if given axis defined in the specified VDJ
BOOL     GetVJDAxisMax(UINT rID, UINT Axis, LONG * Max); // Get logical Maximum value for a given axis defined in the specified VDJ
BOOL     GetVJDAxisMin(UINT rID, UINT Axis, LONG * Min); // Get logical Minimum value for a given axis defined in the specified VDJ
enum VjdStat    GetVJDStatus(UINT rID);         // Get the status of the specified vJoy Device.
// Added in 2.1.6
BOOL    isVJDExists(UINT rID);                  // TRUE if the specified vJoy Device exists
// Added in 2.1.8
int GetOwnerPid(UINT rID);                  // Reurn owner's Process ID if the specified vJoy Device exists


/////   Write access to vJoy Device - Basic
BOOL        AcquireVJD(UINT rID);               // Acquire the specified vJoy Device.
void        RelinquishVJD(UINT rID);            // Relinquish the specified vJoy Device.
BOOL        UpdateVJD(UINT rID, PVOID pData);   // Update the position data of the specified vJoy Device.

/////   Write access to vJoy Device - Modifyiers
// This group of functions modify the current value of the position data
// They replace the need to create a structure of position data then call UpdateVJD

//// Reset functions
BOOL        ResetVJD(UINT rID);         // Reset all controls to predefined values in the specified VDJ
void        ResetAll(void);             // Reset all controls to predefined values in all VDJ
BOOL        ResetButtons(UINT rID);     // Reset all buttons (To 0) in the specified VDJ
BOOL        ResetPovs(UINT rID);        // Reset all POV Switches (To -1) in the specified VDJ

// Write data
BOOL        SetAxis(LONG Value, UINT rID, UINT Axis);       // Write Value to a given axis defined in the specified VDJ
BOOL        SetBtn(BOOL Value, UINT rID, UCHAR nBtn);       // Write Value to a given button defined in the specified VDJ
BOOL        SetDiscPov(int Value, UINT rID, UCHAR nPov);    // Write Value to a given descrete POV defined in the specified VDJ
BOOL        SetContPov(DWORD Value, UINT rID, UCHAR nPov);  // Write Value to a given continuous POV defined in the specified VDJ

]]

if vjoy.vJoyEnabled() then
    print(ffi.string(vjoy.GetvJoyManufacturerString()))
    print(ffi.string(vjoy.GetvJoyProductString()))
    print(ffi.string(vjoy.GetvJoySerialNumberString()))

    local dllVer = ffi.new("WORD[1]")
    local drvVer = ffi.new("WORD[1]")

    local match = vjoy.DriverMatch(dllVer, drvVer)

    if match then
        print(string.format("VJOY: Driver version %i matches DLL version %i", tonumber(drvVer[0]), tonumber(dllVer[0])))
    else
        print(string.format("VJOY: Driver version %i MISMATCHES DLL version %i", tonumber(drvVer[0]), tonumber(dllVer[0])))
    end
end

return vjoy