#define XVT_INCL_NATIVE
#define XI_INTERNAL
#include <xi.h>
#include <os_dep.h>    

#include <commdlg.h>
#include <toolhelp.h>  
#include <spool.h>
#include <ver.h>

#ifndef ATTR_WIN_USE_CTL3D
#include <ctl3d.h>
#endif

#include <ctype.h>
#include <dos.h>

#include <applicat.h>
#include <colors.h>
#include <config.h>
#include <mask.h>

extern "C" { WINDOW xvtwi_hwnd_to_window(HWND); }

///////////////////////////////////////////////////////////
// Win16 event hook
///////////////////////////////////////////////////////////

const word WM_WAKEUP = RegisterWindowMessage("WAKEUP");
HTASK _waiting_for = 0xFFFF;

extern "C" { WINDOW xvtwi_hwnd_to_window(HWND); }

HIDDEN BOOLEAN event_hook(HWND hwnd,
                          UINT msg,
                          UINT wparam,
                          ULONG lparam,
                          long* ret)
{
  switch(msg)     
  {      
#ifndef ATTR_WIN_USE_CTL3D
  case WM_SYSCOLORCHANGE:
    Ctl3dColorChange();
    break;
#endif    
  case WM_MENUCHAR:
    if (wparam > ' ' && wparam <= 'z')
    {
      WINDOW win = cur_win();
      if (win != NULL_WIN)
      {                   
        const KEY key = toupper(wparam)+K_CTRL;
        dispatch_e_char(win, key);
        *ret = 2 << 16;
      }  
    }   
    break;  
  case WM_KEYDOWN:
    if (wparam == VK_F1)
    {
      if ((lparam & (1<<29)) == 0)             // Il tasto alt non e' premuto
      {
        KEY k = K_F1;
        
        int sc = GetAsyncKeyState(VK_CONTROL); // Stato del tasto control 
        if (sc & 0x8000) k += K_CTRL;
        
        int ss = GetAsyncKeyState(VK_SHIFT);   // Stato del tasto shift 
        if (ss & 0x8000) k += K_SHIFT;

        WINDOW win = cur_win();
        if (win != NULL_WIN)
          dispatch_e_char(win, k);
      }  
    }
    break;
  case WM_DROPFILES:
    if (cur_win() != NULL_WIN)
    {
      WINDOW win = xvtwi_hwnd_to_window(hwnd);
      if (win != NULL)
      {
        EVENT e;
        e.type = E_USER;
        e.v.user.id = E_DROP_FILES;
        e.v.user.ptr = (void*)wparam;
        xvt_win_dispatch_event(win, &e);
      }  
    }
    break;
  default:  
    if (msg == WM_WAKEUP)
    {
      if (wparam == _waiting_for)
        _waiting_for = 0xFFFF;
    }    
    break;
  }    

  return TRUE; // Continua col processo normale
}

///////////////////////////////////////////////////////////
// Operating system dependent functions
///////////////////////////////////////////////////////////

bool os_allow_another_instance()
{ 
	NFCHECK("Bisogna implementare la allow_another_instance");
  return TRUE;  
}

COLOR os_choose_color(COLOR col, WINDOW win)
{
  CHOOSECOLOR cc;
  memset(&cc, 0, sizeof(cc));            // Azzera struttura 

  if (win == NULL_WIN) win = TASK_WIN;   // Sceglie una finestra valida
  
  HWND hwnd = (HWND)xvt_vobj_get_attr(win, ATTR_NATIVE_WINDOW);
  HDC hdc = GetDC(hwnd);
  
  // Legge la palette di sistema 
  PALETTEENTRY* pe = NULL;
  int max_entries = 0;
  if (GetDeviceCaps(hdc, RASTERCAPS) & RC_PALETTE)
  {                             
    max_entries = GetDeviceCaps(hdc, SIZEPALETTE);
    pe = new PALETTEENTRY[max_entries];
    GetSystemPaletteEntries(hdc, 0, max_entries, pe);
  }
  ReleaseDC(hwnd, hdc);
  
  // Definisce i 16 colori customizzabili  
  unsigned long custom_colors[16];
  for (int c = 0; c < 16; c++)
  {
    if (pe)
    {     
      const PALETTEENTRY& e = pe[c < 8 ? c : max_entries - 16 + c];
      custom_colors[c] = RGB(e.peRed, e.peGreen, e.peBlue);
    }
    else    
    {
      const unsigned char val   = (c & 0x8) ? 255 : 127;
      const unsigned char red   = (c & 0x1) ? val : 0;
      const unsigned char green = (c & 0x2) ? val : 0;
      const unsigned char blue  = (c & 0x4) ? val : 0;
      custom_colors[c] = RGB(red, green, blue);
    }  
  }
  if (pe) 
  {
    delete pe;
    pe = NULL;
  }  
    
  cc.lStructSize  = sizeof(cc);               // Setta dimensioni
  cc.hwndOwner    = hwnd;                     // Setta finestra padre
  cc.rgbResult    = RGB(XVT_COLOR_GET_RED(c), XVT_COLOR_GET_GREEN(c), XVT_COLOR_GET_BLUE(c));
  cc.lpCustColors = custom_colors;            // Fissa colori custom
  cc.Flags        = CC_RGBINIT;               // Usa col come primo colore 
    
  if (ChooseColor(&cc) != 0)
    col = RGB2COLOR(GetRValue(cc.rgbResult), GetGValue(cc.rgbResult), GetBValue(cc.rgbResult));
  else
    col = COLOR_INVALID;
  return col;  
}

bool os_deny_another_instance()
{ 
  return TRUE;
}

bool os_destroy_native_icon(unsigned icon)
{
  return DestroyIcon((HICON)icon) != 0;
}

void os_draw_native_icon(WINDOW win, const RCT& rct, unsigned icon)
{  
  HDC hdc = (HDC)xvt_vobj_get_attr(win, ATTR_NATIVE_GRAPHIC_CONTEXT);
  int x = (rct.right + rct.left - 32) / 2;
  int y = (rct.bottom + rct.top - 32) / 2;
  DrawIcon(hdc, x, y, (HICON)icon);
}

unsigned long os_get_free_memory()
{
  return GetFreeSpace(0);
}

bool os_is_removable_drive(const char* path)
{            
  bool yes = isalpha(path[0]) && path[1] == ':';
  if (yes)   
    yes = GetDriveType(toupper(path[0]) - 'A') == DRIVE_REMOVABLE;
  return yes;
}

bool os_is_network_drive(const char* path)
{
  bool yes = isalpha(path[0]) && path[1] == ':';
  if (yes)   
    yes = GetDriveType(toupper(path[0]) - 'A') == DRIVE_REMOTE;
  return yes;
}

bool os_is_fixed_drive(const char* path)
{
  bool yes = isalpha(path[0]) && path[1] == ':';
  if (yes)   
    yes = GetDriveType(toupper(path[0]) - 'A') == DRIVE_FIXED;
  return yes;
}

bool os_test_disk_free_space(const char* path, unsigned long filesize)
{
  int disk = 0;
  if (path && *path && path[1] == ':')
  {
    const char letter = toupper(path[0]);
    disk = letter - 'A' + 1;
  }            
  bool space_ok = FALSE;
  struct _diskfree_t drive;
  if (_dos_getdiskfree(disk, &drive) == 0)
  {
    const unsigned requested_clusters = unsigned(filesize / drive.sectors_per_cluster / drive.bytes_per_sector) + 1;
    space_ok = requested_clusters <= drive.avail_clusters;
  }
  return space_ok;
}

unsigned long os_get_disk_size(const char* path)
{
  int disk = 0;
  if (path && *path && path[1] == ':')
  {
    const char letter = toupper(path[0]);
    disk = letter - 'A' + 1;
  }  
  
  unsigned long bytes = 0;
  struct _diskfree_t drive;
  if (_dos_getdiskfree(disk, &drive) == 0)
  {              
    bytes = drive.total_clusters;
    bytes *= drive.sectors_per_cluster;
    bytes *= drive.bytes_per_sector;
  }
  return bytes;
}

void os_exec_help_command(MENU_TAG tag, const char* key)
{
  TFilename hlp("prassi.hlp");
  TString mod(key); 
  if (mod.not_empty())
  {
    mod.cut(2); mod.lower();
    if (mod != "ba") 
      hlp.insert(mod, 0);
  }
  else
  {
    if (tag == M_HELP_ONCONTEXT)
      tag = M_HELP_CONTENTS;
  }
    
  HWND hwnd = (HWND)xvt_vobj_get_attr(TASK_WIN, ATTR_NATIVE_WINDOW);
  switch(tag)
  {                     
  case M_HELP_CONTENTS: WinHelp(hwnd, hlp, HELP_CONTENTS, 0); break;
  case M_HELP_SEARCH: WinHelp(hwnd, hlp, HELP_PARTIALKEY, (DWORD)""); break;
  case M_HELP_HELPONHELP: WinHelp(hwnd, hlp, HELP_HELPONHELP, 0); break;
  case M_HELP_ONCONTEXT:
    if (hlp.exist())
    {
      struct MULTIGUY
      {
        UINT mkSize;
        BYTE mkKeylist;
        char mkKeyphrase[16];
      } mk;

      mk.mkSize = sizeof(MULTIGUY);
      mk.mkKeylist = 'M';
      strcpy(mk.mkKeyphrase, key);

      WinHelp(hwnd, hlp, HELP_MULTIKEY, (DWORD)&mk);
    }
    break;
  default: break;  
  }
}

int os_execute(const TFilename& path, bool sync, bool iconizetask, bool showchild)
{
  word exitcode = ::WinExec(path, showchild ? SW_SHOWNORMAL : SW_HIDE);

  if (exitcode < 32)
  {
    switch (exitcode)
    {     
    case 0:
      exitcode = 8;
    case 8:
      error_box("Memoria o risorse insufficienti per eseguire '%s'", (const char*)path); break;
    default:
      error_box("Impossibile eseguire '%s': %d", (const char*)path, exitcode); break;
    }
    return exitcode;
  }
  
  if (sync)
  { 
    bool was_maximized = FALSE;
    if (iconizetask)
    {
      HWND hwnd = (HWND)xvt_vobj_get_attr(TASK_WIN, ATTR_NATIVE_WINDOW);
      if (hwnd)
      {
        was_maximized = IsZoomed(hwnd);
        TTemp_window tw(TASK_WIN);
        tw.iconize();
        tw.deactivate();
      }
    }  

    const char* szModule = path.name();
    HTASK child = NULL;
    TASKENTRY te; te.dwSize = sizeof(TASKENTRY); 
    for (bool ok = TaskFirst(&te); ok; ok = TaskNext(&te))
      if (te.hInst == (HINSTANCE)exitcode ||
          stricmp(te.szModule, szModule) == 0)
      {
        child = te.hTask;
        break;
      }  
          
    // Warning! child could be NULL if you run that beast called Foxpro        
    _waiting_for = child; 
    for (byte i = 0; _waiting_for == child; i++)
    {          
      // Esegue il controllo solo ogni 256 cicli
      if (i == 0 && ok && TaskFindHandle(&te, child) == FALSE) 
      {       
        _waiting_for = 0xFFFF; // Annulla attesa del processo
        break;
      }  
      xvt_app_process_pending_events();
    }
    
    if (iconizetask && TASK_WIN)
    {
      TTemp_window tw(TASK_WIN);
      if (was_maximized)
        tw.maximize();   // Non e' piu' detto che sia massimizzata!
      else
        os_restore_window(tw.win());
      tw.activate();             
    }  
        
    xvt_app_process_pending_events();
  }
  xvt_statbar_refresh();
  
  return 0;
}

bool os_spawn_by_menu()
{
  TASKENTRY te; te.dwSize = sizeof(TASKENTRY);
  HTASK ct = GetCurrentTask();
  TaskFindHandle(&te, ct);
  TaskFindHandle(&te, te.hTaskParent);
  bool yes = stricmp(te.szModule, "BA0") == 0 ||
#ifdef DBG
    stricmp(te.szModule, "CVW4") == 0 ||
    stricmp(te.szModule, "MSVC") == 0 ||
#endif
    stricmp(te.szModule, "Explorer") == 0 ||
    stricmp(te.szModule, "PROGMAN") == 0;
  return yes;      
}

int os_get_printer_names(TToken_string& t)
{
  char* buf = t.get_buffer(4096); // ammazzao'
  GetProfileString ("devices", NULL, "", buf, t.size());
  for (int i = 0; i < t.size(); i++)
  {
    if (buf[i] == '\0')
    {
      if (buf[i+1] != '\0') buf[i] = '|';
      else break;
    }  
  }
  return t.items();
}

bool os_set_default_printer(const char* name)
{                  
  CHECK(name && *name > ' ', "Null printer name");
  TString pdev(name);
  if (pdev.find(',') < 0)
  {
    TString szDevice(256);  
    GetProfileString ("devices", pdev, "", szDevice.get_buffer(), szDevice.size());
    pdev << ',' << szDevice;
  }  
  bool ok = WriteProfileString("windows", "device", pdev) != 0;  
  return ok;  
}

bool os_get_default_printer(TString& name)
{
  char* buf = name.get_buffer(128);
  bool ok = GetProfileString ("windows", "device", ",,,", buf, name.size()) != 0;
  return ok;
}

bool os_get_image_editor_path(TFilename& name)
{
  // where is EasyDoc installed?                 
  GetPrivateProfileString("Easydoc", "Path", "\\EASYDOC", 
                          name.get_buffer(), name.size(), 
                          "EasyDoc.ini");  

  // You're unlucky there is no EasyDoc
  if (name.empty())
    return FALSE;
  
  // paste EasyDoc path
  name.add("easydoc.exe");    
  
  // is EasyDoc present?
  bool ok = name.exist();
  return ok;
}

os_type os_get_type()
{
  const DWORD winflags = GetWinFlags();
  if (winflags & 0x4000)  
    return os_WindowsNT;

  const DWORD osver = GetVersion();
  const DWORD winver = LOWORD(osver);
  const BYTE majwinver = LOBYTE(winver);
  const BYTE minwinver = HIBYTE(winver);
  if (majwinver == 3 && minwinver == 95)
  {
    const DWORD dosver = HIWORD(osver);
    const BYTE majdosver = LOBYTE(dosver);  // Should be 7 anyway
    const BYTE mindosver = HIBYTE(dosver);
    return (majdosver > 7 || (majdosver == 7 && mindosver >= 10)) ? os_Windows98 : os_Windows95;
  }   
  else
  {
    if (majwinver == 4)
      return os_WindowsME;
  }
  return os_Windows;  
}

void os_post_menu_event(WINDOW win, MENU_TAG tag)
{
  HWND w = (HWND)xvt_vobj_get_attr(win, ATTR_NATIVE_WINDOW);
  PostMessage(w, WM_COMMAND, tag, 0L);
}

void os_set_event_hook()
{
  xvt_vobj_set_attr(NULL_WIN, ATTR_EVENT_HOOK, (long)event_hook); 

#ifdef ATTR_WIN_USE_CTL3D
  xvt_vobj_set_attr(NULL_WIN, ATTR_WIN_USE_CTL3D, TRUE);
#endif  

  long twin_style = WSF_ICONIZABLE | WSF_CLOSE | WSF_SIZE;  
  const int scx = GetSystemMetrics(SM_CXSCREEN);
  const int scy = GetSystemMetrics(SM_CYSCREEN);
  static RCT rct;
  if (scx <= 640 && os_get_type() >= os_Windows95)
  {
    const int bcx = GetSystemMetrics(SM_CXFRAME); 
    const int bcy = GetSystemMetrics(SM_CYFRAME);
    rct.left   = -bcx;
    rct.top    = GetSystemMetrics(SM_CYCAPTION)-bcy-1;
    rct.right  = scx+bcx;
    rct.bottom = scy+bcy;
    xvt_vobj_set_attr(NULL_WIN, ATTR_WIN_PM_TWIN_STARTUP_RCT, long(&rct));
  }
  else
  {
    TConfig cfg(CONFIG_USER, "Colors");
    const int res = cfg.get_int("Resolution");
    if (res >= 640 && res < scx)
    {                                                        
      const int width = res + 2*GetSystemMetrics(SM_CXFRAME);
      const int height = (res * 3) / 4 + 2*GetSystemMetrics(SM_CYFRAME) - GetSystemMetrics(SM_CYCAPTION) - 1;
      const int deltax = (scx - width) / 2;
      const int deltay = (scy - height) / 2;
      rct.left   = deltax;
      rct.top    = deltay;
      rct.right  = deltax + width;
      rct.bottom = deltay + height;
      xvt_vobj_set_attr(NULL_WIN, ATTR_WIN_PM_TWIN_STARTUP_RCT, long(&rct));
    }
    else
      twin_style |= WSF_MAXIMIZED;  
  }
  
  xvt_vobj_set_attr(NULL_WIN,ATTR_WIN_PM_TWIN_STARTUP_STYLE, twin_style);
}

void os_wake_up_caller()
{
  const HTASK ht = GetCurrentTask();
//  SendMessage(HWND_BROADCAST, WM_WAKEUP, (WPARAM)ht, 0L);
  PostMessage(HWND_BROADCAST, WM_WAKEUP, (WPARAM)ht, 0L);

  HWND hwnd = (HWND)xvt_vobj_get_attr(TASK_WIN, ATTR_NATIVE_WINDOW);
  WinHelp(hwnd, "prassi.hlp", HELP_QUIT, 0L);

//  do_events(); non si puo' fare qui
}


bool os_file_exist(const char* file)
{
  HFILE hf = _lopen(file, READ);
  bool ok = hf != HFILE_ERROR;
  if (ok)
    _lclose(hf);
  return ok;  
}  

bool os_open_spool_row(const char* device)
{
  return TRUE;
}

bool os_spool_row(const char* str)
{
  return SpoolRow((char*)str, strlen(str)) != 0;
}

bool os_close_spool_row()
{
  return TRUE;
}

void os_iconize_window(WINDOW win)
{
  HWND hwnd = (HWND)xvt_vobj_get_attr(win, ATTR_NATIVE_WINDOW);
  ShowWindow(hwnd, SW_MINIMIZE);
}

void os_maximize_window(WINDOW win)
{
  HWND hwnd = (HWND)xvt_vobj_get_attr(win, ATTR_NATIVE_WINDOW);
  HWND twin = (HWND)xvt_vobj_get_attr(TASK_WIN, ATTR_NATIVE_WINDOW);
  if (hwnd != twin)
  {
    HWND pare = GetParent(hwnd);
    RECT rct; GetClientRect(pare, &rct);
    if (pare == twin)
      rct.bottom -= 24;
    SetWindowPos(hwnd, pare, 
                 rct.left, rct.top, rct.right, rct.bottom,
                 SWP_NOZORDER);
  }
  else
    ShowWindow(hwnd, SW_SHOWMAXIMIZED);
}

void os_restore_window(WINDOW win)
{
  HWND hwnd = (HWND)xvt_vobj_get_attr(win, ATTR_NATIVE_WINDOW);
  ShowWindow(hwnd, SW_NORMAL);
}

bool os_dongle_server_running()
{
  ATOM a = GlobalFindAtom("DONGLE_SERVER_ATOM");
  return a != 0;
}

HIDDEN const char* _file_to_find = NULL;

struct TFindWindowInfo
{ 
  HINSTANCE _instance;
  TFilename _file;
  HWND _hwnd;
  
  TFindWindowInfo() : _instance(NULL), _hwnd(NULL) { }
};

BOOL CALLBACK EnumWindowsProc(HWND hwnd, LPARAM lParam)
{
  TFindWindowInfo* w = (TFindWindowInfo*)lParam;

  HINSTANCE inst = GetWindowWord(hwnd, GWW_HINSTANCE);
  if (inst == w->_instance)
  {         
    const LONG style = GetWindowLong(hwnd, GWL_STYLE);
    if ((style & WS_CAPTION) != 0)  // Ha la caption?
    {
      w->_hwnd = hwnd;
      return FALSE;
    }
    return TRUE;  
  }  

  TString256 str;
  GetWindowText(hwnd, str.get_buffer(), str.size());
  str.upper();
  if (str.find(w->_file) >= 0)
  {
    w->_hwnd = hwnd;
    return FALSE;
  }

  return TRUE;
}

unsigned long os_execute_in_window(const TFilename& path, WINDOW win)
{
  const word exitcode = WinExec(path, SW_SHOWNORMAL);
  if (exitcode < 32)
    return 0;

  TFindWindowInfo w;
  w._instance = exitcode;

  const int space = path.find(' ');
  if (space > 0)
    w._file = path.mid(space+1);
  else
    w._file = path;
  w._file = w._file.name();
  w._file.ext("");
  w._file.upper();

  const clock_t start = clock();
  while (w._hwnd == NULL && (clock() - start) < 10*CLOCKS_PER_SEC)
  { 
    xvt_app_process_pending_events();
    FARPROC farproc = MakeProcInstance(FARPROC(EnumWindowsProc), NULL);
    EnumWindows(farproc, LPARAM(&w));
    FreeProcInstance(farproc);           
  }  

  if (w._hwnd != NULL)  // L'ho trovata!
  {                                                          
    RCT rct; xvt_vobj_get_client_rect(win, &rct);
    HWND nat = (HWND)xvt_vobj_get_attr(win, ATTR_NATIVE_WINDOW);
    SetParent(w._hwnd, nat);
//    LONG style = GetWindowLong(w._hwnd, GWL_STYLE);
//    style |= WS_CHILD;
//    SetWindowLong(w._hwnd, GWL_STYLE, style);
    const int fx = GetSystemMetrics(SM_CXFRAME);
    const int fy = GetSystemMetrics(SM_CYFRAME);
    int cy = GetSystemMetrics(SM_CYCAPTION)+GetSystemMetrics(SM_CYBORDER);
    if (GetMenu(w._hwnd) != NULL) 
      cy += GetSystemMetrics(SM_CYMENU);
    SetWindowPos(w._hwnd, nat, -fx, -fy-cy, rct.right+2*fx, rct.bottom+cy+2*fy, SWP_NOZORDER);
  }
  
  return w._hwnd;
}

bool os_test_network_version()
{
  if (os_get_type() == os_Windows95)
  {
    const char* VREDIRNAME = "vredir.vxd";
    DWORD handle;
    BYTE infoBuffer[512];
    
    DWORD dwSize = GetFileVersionInfoSize(VREDIRNAME,&handle);
    if (dwSize)
    {
      GetFileVersionInfo(VREDIRNAME,handle,dwSize,infoBuffer);
      long *language;
      void * lpBuffer;
      char szName[128];
      UINT Size;
      if (VerQueryValue(infoBuffer, "\\VarFileInfo\\Translation", (void **)&language, &Size) && Size!=0) 
      {
        sprintf(szName, "\\StringFileInfo\\%04x%04x\\FileVersion",LOWORD(*language), HIWORD(*language));
        if (VerQueryValue(infoBuffer, szName, &lpBuffer, &Size) && Size!=0) 
        {
          TToken_string v((const char *)lpBuffer,'.');
          int subver=atoi(v.get(2));
          if (subver >=1111 && subver <=1115)
            return error_box("La versione %s del driver di rete '%s' contiene un errore riconosciuto da Microsoft.\nConsultare il vostro tecnico per aggiornare il sistema operativo.",(const char *)lpBuffer, VREDIRNAME);
          else
            return TRUE;
        }
      }
    }
    //VREDIR.VXD puo' non esistere; inutile la segnalazione seguente.
    //message_box("Impossibile determinare la versione del driver di rete '%s'",VREDIRNAME);
  }
  return TRUE;
}

void os_sleep(long m)
{
  clock_t fine = ((m * CLOCKS_PER_SEC)/1000) + clock();

  while (fine > clock())
    do_events();
}

void os_beep(int severity)
{
  switch (severity)
  {
  case  0: MessageBeep(MB_OK); break;
  case  1: MessageBeep(MB_ICONEXCLAMATION); break;
  default: MessageBeep(MB_ICONSTOP); break;
  }
}