// fv 6/10/93                       

#include <stdio.h>
#include <xvt.h>

#if XVT_OS == XVT_OS_SCOUNIX
#include <sys/fcntl.h>
#include <sys/wait.h>
#endif

#if XVT_OS == XVT_OS_WIN
#include <windows.h>
#include <toolhelp.h>
#endif

#include <applicat.h>
#include <execp.h> 

bool TExternal_app::can_run() const
{                    
#if XVT_OS == XVT_OS_WIN
  const TFixed_string p(_path);           
  const bool big = p.find("cg0") == 0 && p.right(2) == "-1";
  const int richieste = big ? 50 : 15;
  const int libere = GetFreeSystemResources(GFSR_SYSTEMRESOURCES);
  return libere >= richieste;
#else
  return TRUE;
#endif
}


int TExternal_app::run(bool async, bool user)
{
  TString256 path(_path);
  
  if (user)
    path << " -u" << main_app().user();
  
  _error = 0;
  _exitcode =  0;

  // save cwd
  save_dir();

#if XVT_OS == XVT_OS_WIN
  if (can_run())
  { 
    main_app().begin_wait();
    _exitcode = WinExec((char*)(const char*)path, SW_SHOW);
    
    if (_exitcode >= 32)
    {        
      if (!async)
      {                            
        TTemp_window tw(TASK_WIN);
        tw.iconize();
        
        HTASK child = NULL;
        TASKENTRY te; te.dwSize = sizeof(TASKENTRY); 
        for (bool ok = TaskFirst(&te); ok; ok = TaskNext(&te))
          if (te.hInst == (HINSTANCE)_exitcode) child = te.hTask;
        CHECK(child, "Can't find child task");
        
        main_app().wait_for(child); 
        for (byte i = 0; main_app().waiting(); i++)
        {
          if (i == 0 && TaskFindHandle(&te, child) == FALSE) 
            break;
          process_events();
        }
        
        tw.maximize();
      }
      xvt_statbar_refresh();
    }  
    main_app().end_wait();
  } else _exitcode = 8;

  switch (_exitcode)
  {
  case 0:          
  case 8:
    error_box("Risorse insufficienti per eseguire '%s'", (const char*)_path); break;
  case 2:
  case 3:
    error_box("Impossibile trovare '%s'", (const char*)_path); break;
  case 16:
    error_box("'%s' e' gia' in esecuzione", (const char*)_path); break;
  default:
    if (_exitcode < 32)
      error_box("Impossibile eseguire '%s':\nErrore %d", (const char*)_path, _exitcode); 
    else
      _exitcode = 0;  
    break;
  }  
#else

  switch (fork())
  {
  case -1:
    _error = errno;
    _exitcode = -1;
    break;
  case 0:
    const char* s = strdup(path);
    char* p = strchr(s, ' ');
    if (p) *p = '\0';
    const char* pathn = strdup(s);
    const char* args[21];
    int i = 0;
    args[i++] = pathn;
    while ((i < 20) && (p))
    {
      s = p + 1;
      p = strchr(s, ' ');
      if (p) *p = '\0';
      args[i++] = strdup(s);
    }
    args[i] = NULL;
    for (i = 3; i < _NFILE; i++) fcntl(i,F_SETFD,1);
    // execvp( path, NULL);
    execvp ( pathn , args );
    exit ( -1 );
  default:
    if(wait(&_exitcode) == -1)
    {
      error_box("Impossibile eseguire '%s':\nErrore %d", (const char*)_path, _exitcode);
      _exitcode = -1;
    }
    else _exitcode = _exitcode >> 8;
    break;
  }
  _error = errno;
  xvt_escape(XVT_ESC_CH_REFRESH);

#endif

  // restore cwd
  restore_dir();

  // update counts
  if (_exitcode == 0)
    _count++;
  return _exitcode;
}

TExternal_app::TExternal_app(const char* p)
{
  _path =  p;
  _count = 0;
  _error = 0;
  _exitcode =  0;
}