/*
 * "The Road goes ever on and on, down from the door where it began."
 */

#ifdef __cplusplus
extern "C" {
#endif

#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"

#ifdef __cplusplus
}
#  define EXTERN_C extern "C"
#else
#  define EXTERN_C extern
#endif

static void xs_init _((void));

__declspec(dllexport) int
RunPerl(int argc, char **argv, char **env, void *iosubsystem)
{
    int exitstatus;
    PerlInterpreter *my_perl;
    void *pOldIOSubsystem;

    pOldIOSubsystem = SetIOSubSystem(iosubsystem);

    PERL_SYS_INIT(&argc,&argv);

    perl_init_i18nl10n(1);

    if (!(my_perl = perl_alloc()))
	return (1);
    perl_construct( my_perl );
    perl_destruct_level = 0;

    exitstatus = perl_parse( my_perl, xs_init, argc, argv, env);
    if (!exitstatus) {
	exitstatus = perl_run( my_perl );
    }

    perl_destruct( my_perl );
    perl_free( my_perl );

    PERL_SYS_TERM();

    SetIOSubSystem(pOldIOSubsystem);

    return (exitstatus);
}

extern HANDLE PerlDllHandle;

BOOL APIENTRY
DllMain(HANDLE hModule,		/* DLL module handle */
	DWORD fdwReason,	/* reason called */
	LPVOID lpvReserved)	/* reserved */
{ 
    switch (fdwReason) {
	/* The DLL is attaching to a process due to process
	 * initialization or a call to LoadLibrary.
	 */
    case DLL_PROCESS_ATTACH:
/* #define DEFAULT_BINMODE */
#ifdef DEFAULT_BINMODE
	setmode( fileno( stdin  ), O_BINARY );
	setmode( fileno( stdout ), O_BINARY );
	setmode( fileno( stderr ), O_BINARY );
	_fmode = O_BINARY;
#endif
	PerlDllHandle = hModule;
	break;

	/* The DLL is detaching from a process due to
	 * process termination or call to FreeLibrary.
	 */
    case DLL_PROCESS_DETACH:
	break;

	/* The attached process creates a new thread. */
    case DLL_THREAD_ATTACH:
	break;

	/* The thread of the attached process terminates. */
    case DLL_THREAD_DETACH:
	break;

    default:
	break;
    }
    return TRUE;
}

/* Register any extra external extensions */

char *staticlinkmodules[] = {
    "DynaLoader",
    NULL,
};

EXTERN_C void boot_DynaLoader _((CV* cv));

static
XS(w32_GetCwd)
{
    dXSARGS;
    SV *sv = sv_newmortal();
    /* Make one call with zero size - return value is required size */
    DWORD len = GetCurrentDirectory((DWORD)0,NULL);
    SvUPGRADE(sv,SVt_PV);
    SvGROW(sv,len);
    SvCUR(sv) = GetCurrentDirectory((DWORD) SvLEN(sv), SvPVX(sv));
    /* 
     * If result != 0 
     *   then it worked, set PV valid, 
     *   else leave it 'undef' 
     */
    if (SvCUR(sv))
	SvPOK_on(sv);
    EXTEND(sp,1);
    ST(0) = sv;
    XSRETURN(1);
}

static
XS(w32_SetCwd)
{
    dXSARGS;
    if (items != 1)
	croak("usage: Win32::SetCurrentDirectory($cwd)");
    if (SetCurrentDirectory(SvPV(ST(0),na)))
	XSRETURN_YES;

    XSRETURN_NO;
}

static
XS(w32_GetNextAvailDrive)
{
    dXSARGS;
    char ix = 'C';
    char root[] = "_:\\";
    while (ix <= 'Z') {
	root[0] = ix++;
	if (GetDriveType(root) == 1) {
	    root[2] = '\0';
	    XSRETURN_PV(root);
	}
    }
    XSRETURN_UNDEF;
}

static
XS(w32_GetLastError)
{
    dXSARGS;
    XSRETURN_IV(GetLastError());
}

static
XS(w32_LoginName)
{
    dXSARGS;
    char name[256];
    DWORD size = sizeof(name);
    if (GetUserName(name,&size)) {
	/* size includes NULL */
	ST(0) = sv_2mortal(newSVpv(name,size-1));
	XSRETURN(1);
    }
    XSRETURN_UNDEF;
}

static
XS(w32_NodeName)
{
    dXSARGS;
    char name[MAX_COMPUTERNAME_LENGTH+1];
    DWORD size = sizeof(name);
    if (GetComputerName(name,&size)) {
	/* size does NOT include NULL :-( */
	ST(0) = sv_2mortal(newSVpv(name,size));
	XSRETURN(1);
    }
    XSRETURN_UNDEF;
}


static
XS(w32_DomainName)
{
    dXSARGS;
    char name[256];
    DWORD size = sizeof(name);
    if (GetUserName(name,&size)) {
	char sid[1024];
	DWORD sidlen = sizeof(sid);
	char dname[256];
	DWORD dnamelen = sizeof(dname);
	SID_NAME_USE snu;
	if (LookupAccountName(NULL, name, &sid, &sidlen,
			      dname, &dnamelen, &snu)) {
	    XSRETURN_PV(dname);		/* all that for this */
	}
    }
    XSRETURN_UNDEF;
}

static
XS(w32_FsType)
{
    dXSARGS;
    char fsname[256];
    DWORD flags, filecomplen;
    if (GetVolumeInformation(NULL, NULL, 0, NULL, &filecomplen,
			 &flags, fsname, sizeof(fsname))) {
	if (GIMME == G_ARRAY) {
	    XPUSHs(sv_2mortal(newSVpv(fsname,0)));
	    XPUSHs(sv_2mortal(newSViv(flags)));
	    XPUSHs(sv_2mortal(newSViv(filecomplen)));
	    PUTBACK;
	    return;
	}
	XSRETURN_PV(fsname);
    }
    XSRETURN_UNDEF;
}

static
XS(w32_GetOSVersion)
{
    dXSARGS;
    OSVERSIONINFO osver;

    osver.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
    if (GetVersionEx(&osver)) {
	XPUSHs(newSVpv(osver.szCSDVersion, 0));
	XPUSHs(newSViv(osver.dwMajorVersion));
	XPUSHs(newSViv(osver.dwMinorVersion));
	XPUSHs(newSViv(osver.dwBuildNumber));
	XPUSHs(newSViv(osver.dwPlatformId));
	PUTBACK;
	return;
    }
    XSRETURN_UNDEF;
}

static
XS(w32_IsWinNT)
{
    dXSARGS;
    XSRETURN_IV(IsWinNT());
}

static
XS(w32_IsWin95)
{
    dXSARGS;
    XSRETURN_IV(IsWin95());
}

static
XS(w32_FormatMessage)
{
    dXSARGS;
    DWORD source = 0;
    char msgbuf[1024];

    if (items != 1)
	croak("usage: Win32::FormatMessage($errno)");

    if (FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM,
		      &source, SvIV(ST(0)), 0,
		      msgbuf, sizeof(msgbuf)-1, NULL))
	XSRETURN_PV(msgbuf);

    XSRETURN_UNDEF;
}

static
XS(w32_Spawn)
{
    dXSARGS;
    char *cmd, *args;
    PROCESS_INFORMATION stProcInfo;
    STARTUPINFO stStartInfo;
    BOOL bSuccess = FALSE;

    if(items != 3)
	croak("usage: Win32::Spawn($cmdName, $args, $PID)");

    cmd = SvPV(ST(0),na);
    args = SvPV(ST(1), na);

    memset(&stStartInfo, 0, sizeof(stStartInfo));   /* Clear the block */
    stStartInfo.cb = sizeof(stStartInfo);	    /* Set the structure size */
    stStartInfo.dwFlags = STARTF_USESHOWWINDOW;	    /* Enable wShowWindow control */
    stStartInfo.wShowWindow = SW_SHOWMINNOACTIVE;   /* Start min (normal) */

    if(CreateProcess(
		cmd,			/* Image path */
		args,	 		/* Arguments for command line */
		NULL,			/* Default process security */
		NULL,			/* Default thread security */
		FALSE,			/* Must be TRUE to use std handles */
		NORMAL_PRIORITY_CLASS,	/* No special scheduling */
		NULL,			/* Inherit our environment block */
		NULL,			/* Inherit our currrent directory */
		&stStartInfo,		/* -> Startup info */
		&stProcInfo))		/* <- Process info (if OK) */
    {
	CloseHandle(stProcInfo.hThread);/* library source code does this. */
	sv_setiv(ST(2), stProcInfo.dwProcessId);
	bSuccess = TRUE;
    }
    XSRETURN_IV(bSuccess);
}

static
XS(w32_GetTickCount)
{
    dXSARGS;
    XSRETURN_IV(GetTickCount());
}

static
XS(w32_GetShortPathName)
{
    dXSARGS;
    SV *shortpath;

    if(items != 1)
	croak("usage: Win32::GetShortPathName($longPathName)");

    shortpath = sv_mortalcopy(ST(0));
    SvUPGRADE(shortpath, SVt_PV);
    /* src == target is allowed */
    if (GetShortPathName(SvPVX(shortpath), SvPVX(shortpath), SvCUR(shortpath)))
	ST(0) = shortpath;
    else
	ST(0) = &sv_undef;
    XSRETURN(1);
}

static void
xs_init()
{
    char *file = __FILE__;
    dXSUB_SYS;
    newXS("DynaLoader::boot_DynaLoader", boot_DynaLoader, file);

    /* XXX should be removed after checking with Nick */
    newXS("Win32::GetCurrentDirectory", w32_GetCwd, file);

    /* these names are Activeware compatible */
    newXS("Win32::GetCwd", w32_GetCwd, file);
    newXS("Win32::SetCwd", w32_SetCwd, file);
    newXS("Win32::GetNextAvailDrive", w32_GetNextAvailDrive, file);
    newXS("Win32::GetLastError", w32_GetLastError, file);
    newXS("Win32::LoginName", w32_LoginName, file);
    newXS("Win32::NodeName", w32_NodeName, file);
    newXS("Win32::DomainName", w32_DomainName, file);
    newXS("Win32::FsType", w32_FsType, file);
    newXS("Win32::GetOSVersion", w32_GetOSVersion, file);
    newXS("Win32::IsWinNT", w32_IsWinNT, file);
    newXS("Win32::IsWin95", w32_IsWin95, file);
    newXS("Win32::FormatMessage", w32_FormatMessage, file);
    newXS("Win32::Spawn", w32_Spawn, file);
    newXS("Win32::GetTickCount", w32_GetTickCount, file);
    newXS("Win32::GetShortPathName", w32_GetShortPathName, file);

    /* XXX Bloat Alert! The following Activeware preloads really
     * ought to be part of Win32::Sys::*, so they're not included
     * here.
     */
    /* LookupAccountName
     * LookupAccountSID
     * InitiateSystemShutdown
     * AbortSystemShutdown
     * ExpandEnvrironmentStrings
     */
}