//
// cuischem.cpp
//  = UIF scheme implementation = 
//

#include "private.h"
#include "cuisys.h"


//
// gloval variables
//

static class CUIFSystemInfo *vpSysInfo = NULL;


//
// misc def
//

#define COLOR_WHITE RGB( 0xFF, 0xFF, 0xFF )
#define COLOR_BLACK RGB( 0x00, 0x00, 0x00 )


/*=============================================================================*/
/*                                                                             */
/*   C  U I F  S Y S T E M  M E T R I C                                        */
/*                                                                             */
/*=============================================================================*/

//
// CUIFSystemInfo
//  = system info =
//

class CUIFSystemInfo
{
public:
    CUIFSystemInfo( void )
    {
        m_OSVerInfo.dwMajorVersion = 4;
        m_OSVerInfo.dwMinorVersion = 0;
        m_OSVerInfo.dwBuildNumber  = 0;
        m_OSVerInfo.dwPlatformId   = VER_PLATFORM_WIN32_WINDOWS;
        
        m_cBitsPixelScreen   = 8;
        m_fHighContrast      = FALSE;
        m_fHighContrastMenus = FALSE;
    }

    ~CUIFSystemInfo( void )
    {
    }

    void Initialize( void )
    {
        GetOSVersion();
        GetSystemMetrics();
    }

    void Update( void )
    {
        GetSystemMetrics();
    }

    __inline DWORD GetOSPlatformId( void )
    {
        return m_OSVerInfo.dwPlatformId;
    }

    __inline DWORD GetOSMajorVersion( void )
    {
        return m_OSVerInfo.dwMajorVersion;
    }

    __inline DWORD GetOSMinorVersion( void )
    {
        return m_OSVerInfo.dwMinorVersion;
    }
    
    __inline int GetBitsPixelScreen( void )
    {
        return m_cBitsPixelScreen;
    }

    __inline BOOL FHighContrast( void )
    {
        return m_fHighContrast;
    }

    __inline BOOL FHighContrastMenus( void )
    {
        return m_fHighContrastMenus;
    }

protected:
    OSVERSIONINFO m_OSVerInfo;
    int  m_cBitsPixelScreen;
    BOOL m_fHighContrast;
    BOOL m_fHighContrastMenus;

    void GetOSVersion( void )
    {
        m_OSVerInfo.dwOSVersionInfoSize = sizeof(m_OSVerInfo);
        GetVersionEx( &m_OSVerInfo );
    }

    void GetSystemMetrics( void )
    {
        HDC hDC = GetDC( NULL );
        COLORREF crBtnText;
        COLORREF crBtnFace;
        HIGHCONTRAST hicntr;
    
        // device caps
    
        m_cBitsPixelScreen = GetDeviceCaps( hDC, BITSPIXEL );
    
        // system paramater info
    
        MemSet( &hicntr, 0, sizeof(HIGHCONTRAST) );
        hicntr.cbSize = sizeof(HIGHCONTRAST);
        SystemParametersInfo( SPI_GETHIGHCONTRAST, sizeof(HIGHCONTRAST), &hicntr, 0 );
    
        m_fHighContrast = ((hicntr.dwFlags & HCF_HIGHCONTRASTON) != 0);
    
        // misc
    
        crBtnText = GetSysColor( COLOR_BTNTEXT );
        crBtnFace = GetSysColor( COLOR_BTNFACE );
    
        m_fHighContrastMenus = (m_fHighContrast ||
                                    ((crBtnText == COLOR_BLACK) && (crBtnFace == COLOR_WHITE)) ||
                                    ((crBtnText == COLOR_WHITE) && (crBtnFace == COLOR_BLACK)));
    
        // finished
    
        ReleaseDC( NULL, hDC );
    }
};


/*=============================================================================*/
/*                                                                             */
/*   E X P O R T E D  F U N C T I O N S                                        */
/*                                                                             */
/*=============================================================================*/

/*   I N I T  U I F  S Y S   */
/*------------------------------------------------------------------------------



------------------------------------------------------------------------------*/
void InitUIFSys( void )
{
    if (vpSysInfo = new CUIFSystemInfo())
        vpSysInfo->Initialize();
}


/*   D O N E  U I F  S Y S   */
/*------------------------------------------------------------------------------



------------------------------------------------------------------------------*/
void DoneUIFSys( void )
{
    if (vpSysInfo != NULL) {
        delete vpSysInfo;
        vpSysInfo = NULL;
    }
}


/*   U P D A T E  U I F  S Y S   */
/*------------------------------------------------------------------------------



------------------------------------------------------------------------------*/
void UpdateUIFSys( void )
{
    if (vpSysInfo != NULL) {
        vpSysInfo->Update();
    }
}


/*   U I F  I S  W I N D O W S  N  T   */
/*------------------------------------------------------------------------------



------------------------------------------------------------------------------*/
BOOL UIFIsWindowsNT( void )
{
    if (vpSysInfo != NULL) {
        return (vpSysInfo->GetOSPlatformId() == VER_PLATFORM_WIN32_NT);
    }
    else {
        return FALSE;
    }
}


/*   U I F  I S  L O W  C O L O R   */
/*------------------------------------------------------------------------------



------------------------------------------------------------------------------*/
BOOL UIFIsLowColor( void )
{
    if (vpSysInfo != NULL) {
        return (vpSysInfo->GetBitsPixelScreen() <= 8);
    }
    else {
        return TRUE;
    }
}


/*   U I F  I S  H I G H  C O N T R A S T   */
/*------------------------------------------------------------------------------



------------------------------------------------------------------------------*/
BOOL UIFIsHighContrast( void )
{
    if (vpSysInfo != NULL) {
        return vpSysInfo->FHighContrastMenus();  // use FHighContrastMenus, not FHighContrast
    }
    else {
        return FALSE;
    }
}