/*
 * Misc Toolhelp functions
 *
 * Copyright 1996 Marcus Meissner
 */

#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <ctype.h>
#include <assert.h>
#include "winbase.h"
#include "wine/winbase16.h"
#include "winerror.h"
#include "local.h"
#include "tlhelp32.h"
#include "toolhelp.h"
#include "heap.h"
#include "server.h"
#include "debugtools.h"

DEFAULT_DEBUG_CHANNEL(toolhelp);


/* FIXME: to make this working, we have to callback all these registered 
 * functions from all over the WINE code. Someone with more knowledge than
 * me please do that. -Marcus
 */
static struct notify
{
    HTASK16   htask;
    FARPROC16 lpfnCallback;
    WORD     wFlags;
} *notifys = NULL;

static int nrofnotifys = 0;

static FARPROC16 HookNotify = NULL;

/***********************************************************************
 *		NotifyRegister16 (TOOLHELP.73)
 */
BOOL16 WINAPI NotifyRegister16( HTASK16 htask, FARPROC16 lpfnCallback,
                              WORD wFlags )
{
    int	i;

    FIXME("(%x,%lx,%x), semi-stub.\n",
                      htask, (DWORD)lpfnCallback, wFlags );
    if (!htask) htask = GetCurrentTask();
    for (i=0;i<nrofnotifys;i++)
        if (notifys[i].htask==htask)
            break;
    if (i==nrofnotifys) {
        if (notifys==NULL)
            notifys=(struct notify*)HeapAlloc( GetProcessHeap(), 0,
                                               sizeof(struct notify) );
        else
            notifys=(struct notify*)HeapReAlloc( GetProcessHeap(), 0, notifys,
                                        sizeof(struct notify)*(nrofnotifys+1));
        if (!notifys) return FALSE;
        nrofnotifys++;
    }
    notifys[i].htask=htask;
    notifys[i].lpfnCallback=lpfnCallback;
    notifys[i].wFlags=wFlags;
    return TRUE;
}

/***********************************************************************
 *		NotifyUnregister16 (TOOLHELP.74)
 */
BOOL16 WINAPI NotifyUnregister16( HTASK16 htask )
{
    int	i;
    
    FIXME("(%x), semi-stub.\n", htask );
    if (!htask) htask = GetCurrentTask();
    for (i=nrofnotifys;i--;)
        if (notifys[i].htask==htask)
            break;
    if (i==-1)
        return FALSE;
    memcpy(notifys+i,notifys+(i+1),sizeof(struct notify)*(nrofnotifys-i-1));
    notifys=(struct notify*)HeapReAlloc( GetProcessHeap(), 0, notifys,
                                        (nrofnotifys-1)*sizeof(struct notify));
    nrofnotifys--;
    return TRUE;
}

/***********************************************************************
 *		StackTraceCSIPFirst (TOOLHELP.67)
 */
BOOL16 WINAPI StackTraceCSIPFirst16(STACKTRACEENTRY *ste, WORD wSS, WORD wCS, WORD wIP, WORD wBP)
{
    FIXME("(%p, ss %04x, cs %04x, ip %04x, bp %04x): stub.\n", ste, wSS, wCS, wIP, wBP);
    return TRUE;
}

/***********************************************************************
 *		StackTraceFirst (TOOLHELP.66)
 */
BOOL16 WINAPI StackTraceFirst16(STACKTRACEENTRY *ste, HTASK16 Task)
{
    FIXME("(%p, %04x), stub.\n", ste, Task);
    return TRUE;
}

/***********************************************************************
 *		StackTraceNext (TOOLHELP.68)
 */
BOOL16 WINAPI StackTraceNext16(STACKTRACEENTRY *ste)
{
    FIXME("(%p), stub.\n", ste);
    return TRUE;
}

/***********************************************************************
 *		InterruptRegister (TOOLHELP.75)
 */
BOOL16 WINAPI InterruptRegister16( HTASK16 task, FARPROC callback )
{
    FIXME("(%04x, %p), stub.\n", task, callback);
    return TRUE;
}

/***********************************************************************
 *		InterruptUnRegister (TOOLHELP.76)
 */
BOOL16 WINAPI InterruptUnRegister16( HTASK16 task )
{
    FIXME("(%04x), stub.\n", task);
    return TRUE;
}

/***********************************************************************
 *           TimerCount   (TOOLHELP.80)
 */
BOOL16 WINAPI TimerCount16( TIMERINFO *pTimerInfo )
{
    /* FIXME
     * In standard mode, dwmsSinceStart = dwmsThisVM 
     *
     * I tested this, under Windows in enhanced mode, and
     * if you never switch VM (ie start/stop DOS) these
     * values should be the same as well. 
     *
     * Also, Wine should adjust for the hardware timer
     * to reduce the amount of error to ~1ms. 
     * I can't be bothered, can you?
     */
    pTimerInfo->dwmsSinceStart = pTimerInfo->dwmsThisVM = GetTickCount();
    return TRUE;
}

/***********************************************************************
 *           SystemHeapInfo   (TOOLHELP.71)
 */
BOOL16 WINAPI SystemHeapInfo16( SYSHEAPINFO *pHeapInfo )
{
    WORD user = LoadLibrary16( "USER.EXE" );
    WORD gdi = LoadLibrary16( "GDI.EXE" );
    pHeapInfo->wUserFreePercent = (int)LOCAL_CountFree(user) * 100 / LOCAL_HeapSize(user);
    pHeapInfo->wGDIFreePercent  = (int)LOCAL_CountFree(gdi) * 100 / LOCAL_HeapSize(gdi);
    pHeapInfo->hUserSegment = user;
    pHeapInfo->hGDISegment  = gdi;
    FreeLibrary16( user );
    FreeLibrary16( gdi );
    return TRUE;
}


/***********************************************************************
 *           ToolHelpHook                             (KERNEL.341)
 *	see "Undocumented Windows"
 */
FARPROC16 WINAPI ToolHelpHook16(FARPROC16 lpfnNotifyHandler)
{
	FARPROC16 tmp;

	FIXME("(%p), stub.\n", lpfnNotifyHandler);
	tmp = HookNotify;
	HookNotify = lpfnNotifyHandler;
	/* just return previously installed notification function */
	return tmp;
}


/***********************************************************************
 *           CreateToolhelp32Snapshot			(KERNEL32.179)
 */
HANDLE WINAPI CreateToolhelp32Snapshot( DWORD flags, DWORD process ) 
{
    HANDLE ret;

    TRACE("%lx,%lx\n", flags, process );
    if (!(flags & (TH32CS_SNAPPROCESS|TH32CS_SNAPTHREAD|TH32CS_SNAPMODULE)))
    {
        FIXME("flags %lx not implemented\n", flags );
        SetLastError( ERROR_CALL_NOT_IMPLEMENTED );
        return INVALID_HANDLE_VALUE;
    }

    /* Now do the snapshot */
    SERVER_START_REQ( create_snapshot )
    {
        req->flags   = flags & ~TH32CS_INHERIT;
        req->inherit = (flags & TH32CS_INHERIT) != 0;
        req->pid     = (void *)process;
        SERVER_CALL_ERR();
        ret = req->handle;
    }
    SERVER_END_REQ;
    if (!ret) ret = INVALID_HANDLE_VALUE;
    return ret;
}


/***********************************************************************
 *		TOOLHELP_Thread32Next
 *
 * Implementation of Thread32First/Next
 */
static BOOL TOOLHELP_Thread32Next( HANDLE handle, LPTHREADENTRY32 lpte, BOOL first )
{
    BOOL ret;

    if (lpte->dwSize < sizeof(THREADENTRY32))
    {
        SetLastError( ERROR_INSUFFICIENT_BUFFER );
        ERR("Result buffer too small (req: %d, was: %ld)\n", sizeof(THREADENTRY32), lpte->dwSize);
        return FALSE;
    }
    SERVER_START_REQ( next_thread )
    {
        req->handle = handle;
        req->reset = first;
        if ((ret = !SERVER_CALL_ERR()))
        {
            lpte->cntUsage           = req->count;
            lpte->th32ThreadID       = (DWORD)req->tid;
            lpte->th32OwnerProcessID = (DWORD)req->pid;
            lpte->tpBasePri          = req->base_pri;
            lpte->tpDeltaPri         = req->delta_pri;
            lpte->dwFlags            = 0;  /* SDK: "reserved; do not use" */
        }
    }
    SERVER_END_REQ;
    return ret;
}

/***********************************************************************
 *		Thread32First    (KERNEL32.686)
 *
 * Return info about the first thread in a toolhelp32 snapshot
 */
BOOL WINAPI Thread32First(HANDLE hSnapshot, LPTHREADENTRY32 lpte)
{
    return TOOLHELP_Thread32Next(hSnapshot, lpte, TRUE);
}

/***********************************************************************
 *		Thread32Next   (KERNEL32.687)
 *
 * Return info about the "next" thread in a toolhelp32 snapshot
 */
BOOL WINAPI Thread32Next(HANDLE hSnapshot, LPTHREADENTRY32 lpte)
{
    return TOOLHELP_Thread32Next(hSnapshot, lpte, FALSE);
}

/***********************************************************************
 *		TOOLHELP_Process32Next
 *
 * Implementation of Process32First/Next
 */
static BOOL TOOLHELP_Process32Next( HANDLE handle, LPPROCESSENTRY32 lppe, BOOL first )
{
    BOOL ret;

    if (lppe->dwSize < sizeof(PROCESSENTRY32))
    {
        SetLastError( ERROR_INSUFFICIENT_BUFFER );
        ERR("Result buffer too small (req: %d, was: %ld)\n", sizeof(PROCESSENTRY32), lppe->dwSize);
        return FALSE;
    }
    SERVER_START_REQ( next_process )
    {
        req->handle = handle;
        req->reset = first;
        if ((ret = !SERVER_CALL_ERR()))
        {
            lppe->cntUsage            = req->count;
            lppe->th32ProcessID       = (DWORD)req->pid;
            lppe->th32DefaultHeapID   = 0;  /* FIXME */
            lppe->th32ModuleID        = 0;  /* FIXME */
            lppe->cntThreads          = req->threads;
            lppe->th32ParentProcessID = 0;  /* FIXME */
            lppe->pcPriClassBase      = req->priority;
            lppe->dwFlags             = -1; /* FIXME */
            lppe->szExeFile[0]        = 0;  /* FIXME */
        }
    }
    SERVER_END_REQ;
    return ret;
}


/***********************************************************************
 *		Process32First    (KERNEL32.555)
 *
 * Return info about the first process in a toolhelp32 snapshot
 */
BOOL WINAPI Process32First(HANDLE hSnapshot, LPPROCESSENTRY32 lppe)
{
    return TOOLHELP_Process32Next( hSnapshot, lppe, TRUE );
}

/***********************************************************************
 *		Process32Next   (KERNEL32.556)
 *
 * Return info about the "next" process in a toolhelp32 snapshot
 */
BOOL WINAPI Process32Next(HANDLE hSnapshot, LPPROCESSENTRY32 lppe)
{
    return TOOLHELP_Process32Next( hSnapshot, lppe, FALSE );
}


/***********************************************************************
 *		TOOLHELP_Module32Next
 *
 * Implementation of Module32First/Next
 */
static BOOL TOOLHELP_Module32Next( HANDLE handle, LPMODULEENTRY32 lpme, BOOL first )
{
    BOOL ret;

    if (lpme->dwSize < sizeof (MODULEENTRY32))
    {
        SetLastError( ERROR_INSUFFICIENT_BUFFER );
        ERR("Result buffer too small (req: %d, was: %ld)\n", sizeof(MODULEENTRY32), lpme->dwSize);
        return FALSE;
    }
    SERVER_START_REQ( next_module )
    {
        req->handle = handle;
        req->reset = first;
        if ((ret = !SERVER_CALL_ERR()))
        {
            lpme->th32ModuleID   = 0;  /* toolhelp internal id, never used */
            lpme->th32ProcessID  = (DWORD)req->pid;
            lpme->GlblcntUsage   = 0; /* FIXME */
            lpme->ProccntUsage   = 0; /* FIXME */ 
            lpme->modBaseAddr    = req->base;
            lpme->modBaseSize    = 0; /* FIXME */
            lpme->hModule        = (DWORD)req->base;
            lpme->szModule[0]    = 0;  /* FIXME */
            lpme->szExePath[0]   = 0;  /* FIXME */
        }
    }
    SERVER_END_REQ;
    return ret;
}

/***********************************************************************
 *		Module32First   (KERNEL32.527)
 *
 * Return info about the "first" module in a toolhelp32 snapshot
 */
BOOL WINAPI Module32First(HANDLE hSnapshot, LPMODULEENTRY32 lpme)
{
    return TOOLHELP_Module32Next( hSnapshot, lpme, TRUE );
}

/***********************************************************************
 *		Module32Next   (KERNEL32.528)
 *
 * Return info about the "next" module in a toolhelp32 snapshot
 */
BOOL WINAPI Module32Next(HANDLE hSnapshot, LPMODULEENTRY32 lpme)
{
    return TOOLHELP_Module32Next( hSnapshot, lpme, FALSE );
}

/************************************************************************
 *              GlobalMasterHandle16 (KERNEL.28)
 *
 *
 * Should return selector and handle of the information structure for 
 * the global heap. selector and handle are stored in the THHOOK as
 * pGlobalHeap and hGlobalHeap.
 * As Wine doesn't have this structure, we return both values as zero
 * Applications should interpret this as "No Global Heap"
 */
DWORD WINAPI GlobalMasterHandle16(void)
{
    FIXME(": stub\n");
    return 0;
}