/* Cockos SWELL (Simple/Small Win32 Emulation Layer for Linux/OSX)
   Copyright (C) 2006 and later, Cockos, Inc.

    This software is provided 'as-is', without any express or implied
    warranty.  In no event will the authors be held liable for any damages
    arising from the use of this software.

    Permission is granted to anyone to use this software for any purpose,
    including commercial applications, and to alter it and redistribute it
    freely, subject to the following restrictions:

    1. The origin of this software must not be misrepresented; you must not
       claim that you wrote the original software. If you use this software
       in a product, an acknowledgment in the product documentation would be
       appreciated but is not required.
    2. Altered source versions must be plainly marked as such, and must not be
       misrepresented as being the original software.
    3. This notice may not be removed or altered from any source distribution.
*/
  
#ifndef SWELL_PROVIDED_BY_APP

//#import <Carbon/Carbon.h>
#import <Cocoa/Cocoa.h>
#include <IOKit/graphics/IOGraphicsLib.h>
#include <sys/poll.h>
#include "swell.h"
#define SWELL_IMPLEMENT_GETOSXVERSION
#include "swell-internal.h"

#include "../mutex.h"

HWND g_swell_only_timerhwnd;

@implementation SWELL_TimerFuncTarget

-(id) initWithId:(UINT_PTR)tid hwnd:(HWND)h callback:(TIMERPROC)cb
{
  if ((self = [super init]))
  {
    m_hwnd=h;
    m_cb=cb;
    m_timerid = tid;
  }
  return self;
}
-(void)SWELL_Timer:(id)sender
{
  if (g_swell_only_timerhwnd && m_hwnd != g_swell_only_timerhwnd) return;
  
  m_cb(m_hwnd,WM_TIMER,m_timerid,GetTickCount());
}
@end

@implementation SWELL_DataHold
-(id) initWithVal:(void *)val
{
  if ((self = [super init]))
  {
    m_data=val;
  }
  return self;
}
-(void *) getValue
{
  return m_data;
}
@end

void SWELL_CFStringToCString(const void *str, char *buf, int buflen)
{
  NSString *s = (NSString *)str;
  if (buflen>0) *buf=0;
  if (buflen <= 1 || !s || [s getCString:buf maxLength:buflen encoding:NSUTF8StringEncoding]) return; // should always work, I'd hope (ambiguous documentation ugh)
  
  NSData *data = [s dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES];
  if (!data)
  {
    [s getCString:buf maxLength:buflen encoding:NSASCIIStringEncoding];
    return;
  }
  int len = (int)[data length];
  if (len > buflen-1) len=buflen-1;
  [data getBytes:buf length:len];
  buf[len]=0;
}

void *SWELL_CStringToCFString(const char *str)
{
  if (!str) str="";
  void *ret;
  
  ret=(void *)CFStringCreateWithCString(NULL,str,kCFStringEncodingUTF8);
  if (ret) return ret;
  ret=(void*)CFStringCreateWithCString(NULL,str,kCFStringEncodingASCII);
  return ret;
}

void SWELL_MakeProcessFront(HANDLE h)
{
  SWELL_InternalObjectHeader_NSTask *buf = (SWELL_InternalObjectHeader_NSTask*)h;
  if (buf && buf->hdr.type == INTERNAL_OBJECT_NSTASK && buf->task)
  {
    ProcessSerialNumber psn;
    
    int pid=[(id)buf->task processIdentifier];
    // try for 1sec to get the PSN, if it fails
    int n = 20;
    while (GetProcessForPID(pid,&psn) != noErr && n-- > 0)
    {
      Sleep(50);
    }
    if (n>0) SetFrontProcess(&psn);
  }
}

void SWELL_ReleaseNSTask(void *p)
{
  NSTask *a =(NSTask*)p;
  if (a)
  {
    if (![a isRunning]) [a waitUntilExit]; // workaround for the system keeping a reference held on macOS 12+ at least
    [a release];
  }
}
DWORD SWELL_WaitForNSTask(void *p, DWORD msTO)
{
  NSTask *a =(NSTask*)p;
  const DWORD t = GetTickCount();
  do 
  {
    if (![a isRunning]) return WAIT_OBJECT_0;
    if (msTO) Sleep(1);
  }
  while (msTO && (GetTickCount()-t) < msTO);

  return [a isRunning] ? WAIT_TIMEOUT : WAIT_OBJECT_0;
}

HANDLE SWELL_CreateProcessIO(const char *exe, int nparams, const char **params, bool redirectIO)
{
  NSString *ex = (NSString *)SWELL_CStringToCFString(exe);
  NSMutableArray *ar = [[NSMutableArray alloc] initWithCapacity:nparams];

  int x;
  for (x=0;x <nparams;x++)
  {
    NSString *s = (NSString *)SWELL_CStringToCFString(params[x]?params[x]:"");
    [ar addObject:s];
    [s release];
  }

  NSTask *tsk = NULL;
  
  @try {
    tsk = [[NSTask alloc] init];
    [tsk setLaunchPath:ex];
    [tsk setArguments:ar];
    if (redirectIO)
    {
      [tsk setStandardInput:[NSPipe pipe]];
      [tsk setStandardOutput:[NSPipe pipe]];
      [tsk setStandardError:[NSPipe pipe]];
    }
    [tsk launch];
  }
  @catch (NSException *exception) { 
    [tsk release];
    tsk=0;
  }
  @catch (id ex) {
  }

  [ex release];
  [ar release];
  if (!tsk) return NULL;
  
  SWELL_InternalObjectHeader_NSTask *buf = (SWELL_InternalObjectHeader_NSTask*)malloc(sizeof(SWELL_InternalObjectHeader_NSTask));
  buf->hdr.type = INTERNAL_OBJECT_NSTASK;
  buf->hdr.count=1;
  buf->task = tsk;
  return buf;
}

HANDLE SWELL_CreateProcess(const char *exe, int nparams, const char **params)
{
  return SWELL_CreateProcessIO(exe,nparams,params,false);
}


int SWELL_GetProcessExitCode(HANDLE hand)
{
  int rv=0;
  SWELL_InternalObjectHeader_NSTask *hdr=(SWELL_InternalObjectHeader_NSTask*)hand;
  if (!hdr || hdr->hdr.type != INTERNAL_OBJECT_NSTASK || !hdr->task) return -1;
  @try {
    if ([(NSTask *)hdr->task isRunning]) rv=-3;
    else rv = [(NSTask *)hdr->task terminationStatus];
  }
  @catch (id ex) { 
    rv=-2;
  }
  return rv;
}

int SWELL_TerminateProcess(HANDLE hand)
{
  int rv=0;
  SWELL_InternalObjectHeader_NSTask *hdr=(SWELL_InternalObjectHeader_NSTask*)hand;
  if (!hdr || hdr->hdr.type != INTERNAL_OBJECT_NSTASK || !hdr->task) return -1;
  @try
  {
    [(NSTask *)hdr->task terminate];
  }
  @catch (id ex) {
    rv=-2;
  }
  return rv;
}
int SWELL_ReadWriteProcessIO(HANDLE hand, int w/*stdin,stdout,stderr*/, char *buf, int bufsz)
{
  SWELL_InternalObjectHeader_NSTask *hdr=(SWELL_InternalObjectHeader_NSTask*)hand;
  if (!hdr || hdr->hdr.type != INTERNAL_OBJECT_NSTASK || !hdr->task) return 0;
  NSTask *tsk = (NSTask*)hdr->task;
  NSPipe *pipe = NULL;
  bool async_mode = false;
  if (w & (1<<24))
  {
    async_mode = true;
    w &= ~ (1<<24);
  }
  switch (w)
  {
    case 0: pipe = [tsk standardInput]; break;
    case 1: pipe = [tsk standardOutput]; break;
    case 2: pipe = [tsk standardError]; break;
  }
  if (!pipe || ![pipe isKindOfClass:[NSPipe class]]) return 0;

  NSFileHandle *fh = w!=0 ? [pipe fileHandleForReading] : [pipe fileHandleForWriting];
  if (!fh) return 0;
  if (w==0)
  {
    if (bufsz>0)
    {
      NSData *d = [NSData dataWithBytes:buf length:bufsz];
      @try
      {
        if (d) [fh writeData:d];
        else bufsz=0;
      }
      @catch (id ex) { bufsz=0; }

      return bufsz;
    }
  }
  else 
  {
    if (async_mode)
    {
      int handle = [fh fileDescriptor];
      if (handle >= 0)
      {
        struct pollfd pl = { handle, POLLIN };
        if (poll(&pl,1,0)<1) return 0;

        return (int)read(handle,buf,bufsz);
      }
    }
    NSData *d = NULL;
    @try
    {
      d = [fh readDataOfLength:(bufsz < 1 ? 32768 : bufsz)];
    }
    @catch (id ex) { }

    if (!d || bufsz < 1) return d ? (int)[d length] : 0;
    int l = (int)[d length];
    if (l > bufsz) l = bufsz;
    [d getBytes:buf length:l];
    return l;
  }

  return 0;
}


@implementation SWELL_ThreadTmp
-(void)bla:(id)obj
{
  if (a) 
  {
    DWORD (*func)(void *);
    *(void **)(&func) = a;
    func(b);
  }
  [NSThread exit];
}
@end

void SWELL_EnsureMultithreadedCocoa()
{
  static int a;
  if (!a)
  {
    a++;
    if (![NSThread isMultiThreaded]) // force cocoa into multithreaded mode
    {
      SWELL_ThreadTmp *t=[[SWELL_ThreadTmp alloc] init]; 
      t->a=0;
      t->b=0;
      [NSThread detachNewThreadSelector:@selector(bla:) toTarget:t withObject:t];
      ///      [t release];
    }
  }
}

void CreateThreadNS(void *TA, DWORD stackSize, DWORD (*ThreadProc)(LPVOID), LPVOID parm, DWORD cf, DWORD *tidOut)
{
  SWELL_ThreadTmp *t=[[SWELL_ThreadTmp alloc] init]; 
  t->a=(void*)ThreadProc;
  t->b=parm;
  return [NSThread detachNewThreadSelector:@selector(bla:) toTarget:t withObject:t];
}


// used by swell.cpp (lazy these should go elsewhere)
void *SWELL_InitAutoRelease()
{
  NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
  return (void *)pool;
}
void SWELL_QuitAutoRelease(void *p)
{
  if (p)
    [(NSAutoreleasePool*)p release];
}

void SWELL_RunEvents()
{
  NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
  int x=100;
  while (x-- > 0)
  {
    NSEvent *event = [NSApp nextEventMatchingMask:NSAnyEventMask untilDate:[NSDate dateWithTimeIntervalSinceNow:0.001] inMode:NSDefaultRunLoopMode dequeue:YES];
    if (!event) break;
    [NSApp sendEvent:event];
  }
  [pool release];
}

// timer stuff
typedef struct TimerInfoRec
{
  UINT_PTR timerid;
  HWND hwnd;
  NSTimer *timer;
  struct TimerInfoRec *_next;
} TimerInfoRec;
static TimerInfoRec *m_timer_list;
static WDL_Mutex m_timermutex;
#ifndef SWELL_NO_POSTMESSAGE
static pthread_t m_pmq_mainthread;
static void SWELL_pmq_settimer(HWND h, UINT_PTR timerid, UINT rate, TIMERPROC tProc);
#endif

UINT_PTR SetTimer(HWND hwnd, UINT_PTR timerid, UINT rate, TIMERPROC tProc)
{
  if (!hwnd && !tProc) return 0; // must have either callback or hwnd
  
  if (hwnd && !timerid) return 0;
  
#ifndef SWELL_NO_POSTMESSAGE
  if (timerid != ~(UINT_PTR)0 && m_pmq_mainthread && pthread_self()!=m_pmq_mainthread)
  {   
    SWELL_pmq_settimer(hwnd,timerid,(rate==(UINT)-1)?((UINT)-2):rate,tProc);
    return timerid;
  }
#endif
  
  
  if (hwnd && ![(id)hwnd respondsToSelector:@selector(SWELL_Timer:)])
  {
    if (![(id)hwnd isKindOfClass:[NSWindow class]]) return 0;
    hwnd=(HWND)[(id)hwnd contentView];
    if (![(id)hwnd respondsToSelector:@selector(SWELL_Timer:)]) return 0;
  }
  
  WDL_MutexLock lock(&m_timermutex);
  TimerInfoRec *rec=NULL;
  if (hwnd||timerid)
  {
    rec = m_timer_list;
    while (rec)
    {
      if (rec->timerid == timerid && rec->hwnd == hwnd) // works for both kinds
        break;
      rec=rec->_next;
    }
  }
  
  bool recAdd=false;
  if (!rec) 
  {
    rec=(TimerInfoRec*)malloc(sizeof(TimerInfoRec));
    recAdd=true;
  }
  else 
  {
    [rec->timer invalidate];
    rec->timer=0;
  }
  
  rec->timerid=timerid;
  rec->hwnd=hwnd;
  
  if (!hwnd || tProc)
  {
    // set timer to this unique ptr
    if (!hwnd) timerid = rec->timerid = (UINT_PTR)rec;
    
    SWELL_TimerFuncTarget *t = [[SWELL_TimerFuncTarget alloc] initWithId:timerid hwnd:hwnd callback:tProc];
    rec->timer = [NSTimer scheduledTimerWithTimeInterval:(wdl_max(rate,1)*0.001) target:t selector:@selector(SWELL_Timer:)
                                                userInfo:t repeats:YES];
    [t release];
    
  }
  else
  {
    SWELL_DataHold *t=[[SWELL_DataHold alloc] initWithVal:(void *)timerid];
    rec->timer = [NSTimer scheduledTimerWithTimeInterval:(wdl_max(rate,1)*0.001) target:(id)hwnd selector:@selector(SWELL_Timer:)
                                                userInfo:t repeats:YES];
    
    [t release];
  }
  [[NSRunLoop currentRunLoop] addTimer:rec->timer forMode:(NSString*)kCFRunLoopCommonModes];
  
  if (recAdd)
  {
    rec->_next=m_timer_list;
    m_timer_list=rec;
  }
  
  return timerid;
}
void SWELL_RunRunLoop(int ms)
{
  [[NSRunLoop currentRunLoop] runUntilDate:[NSDate dateWithTimeIntervalSinceNow:ms*0.001]];
}
void SWELL_RunRunLoopEx(int ms, HWND hwndOnlyTimer)
{
  HWND h=g_swell_only_timerhwnd;
  g_swell_only_timerhwnd = hwndOnlyTimer;
  [[NSRunLoop currentRunLoop] runUntilDate:[NSDate dateWithTimeIntervalSinceNow:ms*0.001]];
  if (g_swell_only_timerhwnd == hwndOnlyTimer) g_swell_only_timerhwnd = h;
}

BOOL KillTimer(HWND hwnd, UINT_PTR timerid)
{
  if (!hwnd && !timerid) return FALSE;
  
  WDL_MutexLock lock(&m_timermutex);
#ifndef SWELL_NO_POSTMESSAGE
  if (timerid != ~(UINT_PTR)0 && m_pmq_mainthread && pthread_self()!=m_pmq_mainthread)
  {
    SWELL_pmq_settimer(hwnd,timerid,~(UINT)0,NULL);
    return TRUE;
  }
#endif
  BOOL rv=FALSE;
  
  // don't allow removing all global timers
  if (timerid!=~(UINT_PTR)0 || hwnd) 
  {
    TimerInfoRec *rec = m_timer_list, *lrec=NULL;
    while (rec)
    {
      
      if (rec->hwnd == hwnd && (timerid==~(UINT_PTR)0 || rec->timerid == timerid))
      {
        TimerInfoRec *nrec = rec->_next;
        
        // remove self from list
        if (lrec) lrec->_next = nrec;
        else m_timer_list = nrec;
        
        [rec->timer invalidate];
        free(rec);
        
        rv=TRUE;
        if (timerid!=~(UINT_PTR)0) break;
        
        rec=nrec;
      }
      else 
      {
        lrec=rec;
        rec=rec->_next;
      }
    }
  }
  return rv;
}


#ifndef SWELL_NO_POSTMESSAGE

///////// PostMessage emulation

// implementation of postmessage stuff



typedef struct PMQ_rec
{
  HWND hwnd;
  UINT msg;
  WPARAM wParam;
  LPARAM lParam;
  
  struct PMQ_rec *next;
  bool is_special_timer; // if set, then msg=interval(-1 for kill),wParam=timer id, lParam = timerproc
} PMQ_rec;

static WDL_Mutex *m_pmq_mutex;
static PMQ_rec *m_pmq, *m_pmq_empty, *m_pmq_tail;
static int m_pmq_size;
static id m_pmq_timer;
#define MAX_POSTMESSAGE_SIZE 1024

void SWELL_Internal_PostMessage_Init()
{
  if (m_pmq_mutex) return;
  id del = [NSApp delegate];
  if (!del || ![del respondsToSelector:@selector(swellPostMessageTick:)]) return;
  
  m_pmq_mainthread=pthread_self();
  m_pmq_mutex = new WDL_Mutex;
  
  m_pmq_timer = [NSTimer scheduledTimerWithTimeInterval:0.05 target:(id)del selector:@selector(swellPostMessageTick:) userInfo:nil repeats:YES];
  [[NSRunLoop currentRunLoop] addTimer:m_pmq_timer forMode:(NSString*)kCFRunLoopCommonModes];
  //  [ release];
  // set a timer to the delegate
}


void SWELL_MessageQueue_Flush()
{
  if (!m_pmq_mutex) return;
  
  m_pmq_mutex->Enter();
  int max_amt = m_pmq_size;
  PMQ_rec *p=m_pmq;
  if (p)
  {
    m_pmq = p->next;
    if (m_pmq_tail == p) m_pmq_tail=NULL;
    m_pmq_size--;
  }
  m_pmq_mutex->Leave();
  
  // process out queue
  while (p)
  {
    if (p->is_special_timer)
    {
      if (p->msg == ~(UINT)0) KillTimer(p->hwnd,p->wParam);
      else SetTimer(p->hwnd,p->wParam,p->msg,(TIMERPROC)p->lParam);
    }
    else
    {
      if ([(id)p->hwnd respondsToSelector:@selector(swellCanPostMessage)] && [(id)p->hwnd swellCanPostMessage])
        SendMessage(p->hwnd,p->msg,p->wParam,p->lParam); 
    }
    
    m_pmq_mutex->Enter();
    // move this message to empty list
    p->next=m_pmq_empty;
    m_pmq_empty = p;

    // get next queued message (if within limits)
    p = (--max_amt > 0) ? m_pmq : NULL;
    if (p)
    {
      m_pmq = p->next;
      if (m_pmq_tail == p) m_pmq_tail=NULL;
      m_pmq_size--;
    }
    m_pmq_mutex->Leave();
  }
}

void SWELL_Internal_PMQ_ClearAllMessages(HWND hwnd)
{
  if (!m_pmq_mutex) return;
  
  m_pmq_mutex->Enter();
  PMQ_rec *p=m_pmq;
  PMQ_rec *lastrec=NULL;
  while (p)
  {
    if (hwnd && p->hwnd != hwnd) { lastrec=p; p=p->next; }
    else
    {
      PMQ_rec *next=p->next; 
      
      p->next=m_pmq_empty; // add p to empty list
      m_pmq_empty=p;
      m_pmq_size--;
      
      
      if (p==m_pmq_tail) m_pmq_tail=lastrec; // update tail
      
      if (lastrec)  p = lastrec->next = next;
      else p = m_pmq = next;
    }
  }
  m_pmq_mutex->Leave();
}

static void SWELL_pmq_settimer(HWND h, UINT_PTR timerid, UINT rate, TIMERPROC tProc)
{
  if (!h||!m_pmq_mutex) return;
  WDL_MutexLock lock(m_pmq_mutex);
  
  PMQ_rec *rec=m_pmq;
  while (rec)
  {
    if (rec->is_special_timer && rec->hwnd == h && rec->wParam == timerid)
    {
      rec->msg = rate; // adjust to new rate
      rec->lParam = (LPARAM)tProc;
      return;
    }
    rec=rec->next;
  }  
  
  rec=m_pmq_empty;
  if (rec) m_pmq_empty=rec->next;
  else rec=(PMQ_rec*)malloc(sizeof(PMQ_rec));
  rec->next=0;
  rec->hwnd=h;
  rec->msg=rate;
  rec->wParam=timerid;
  rec->lParam=(LPARAM)tProc;
  rec->is_special_timer=true;
  
  if (m_pmq_tail) m_pmq_tail->next=rec;
  else 
  {
    PMQ_rec *p=m_pmq;
    while (p && p->next) p=p->next; // shouldnt happen unless m_pmq is NULL As well but why not for safety
    if (p) p->next=rec;
    else m_pmq=rec;
  }
  m_pmq_tail=rec;
  m_pmq_size++;
}

BOOL PostMessage(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
  if (WDL_NORMALLY(m_pmq_mutex != NULL))
  {
    return SWELL_Internal_PostMessage(hwnd,message,wParam,lParam);
  }

  // legacy passthrough to delegate if caller is using its own swell impl, not threadsafe
  id del=[NSApp delegate];
  if (del && [del respondsToSelector:@selector(swellPostMessage:msg:wp:lp:)])
    return !![(SWELL_DelegateExtensions*)del swellPostMessage:hwnd msg:message wp:wParam lp:lParam];
  return FALSE;
}

void SWELL_MessageQueue_Clear(HWND h)
{
  if (WDL_NORMALLY(m_pmq_mutex != NULL))
  {
    SWELL_Internal_PMQ_ClearAllMessages(h);
  }
  else
  {
    id del=[NSApp delegate];
    if (del && [del respondsToSelector:@selector(swellPostMessageClearQ:)])
      [(SWELL_DelegateExtensions*)del swellPostMessageClearQ:h];
  }
}

BOOL SWELL_Internal_PostMessage(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
  if (!hwnd||!m_pmq_mutex) return FALSE;

  BOOL ret=FALSE;
  m_pmq_mutex->Enter();
  
  if (m_pmq_empty||m_pmq_size<MAX_POSTMESSAGE_SIZE)
  {
    PMQ_rec *rec=m_pmq_empty;
    if (rec) m_pmq_empty=rec->next;
    else rec=(PMQ_rec*)malloc(sizeof(PMQ_rec));
    rec->next=0;
    rec->hwnd=hwnd;
    rec->msg=msg;
    rec->wParam=wParam;
    rec->lParam=lParam;
    rec->is_special_timer=false;
    
    if (m_pmq_tail) m_pmq_tail->next=rec;
    else 
    {
      PMQ_rec *p=m_pmq;
      while (p && p->next) p=p->next; // shouldnt happen unless m_pmq is NULL As well but why not for safety
      if (p) p->next=rec;
      else m_pmq=rec;
    }
    m_pmq_tail=rec;
    m_pmq_size++;
    
    ret=TRUE;
  }
  
  m_pmq_mutex->Leave();
  
  return ret;
}
#endif

static bool s_rightclickemulate=true;

bool IsRightClickEmulateEnabled()
{
  return s_rightclickemulate;
}

void SWELL_EnableRightClickEmulate(BOOL enable)
{
  s_rightclickemulate=enable;
}

int g_swell_terminating;
void SWELL_PostQuitMessage(void *sender)
{
  g_swell_terminating=true;

  [NSApp terminate:(id)sender];
}


#ifndef MAC_OS_X_VERSION_10_9
typedef uint64_t NSActivityOptions;
enum
{
  NSActivityIdleDisplaySleepDisabled = (1ULL << 40),
  NSActivityIdleSystemSleepDisabled = (1ULL << 20),
  NSActivitySuddenTerminationDisabled = (1ULL << 14),
  NSActivityAutomaticTerminationDisabled = (1ULL << 15),
  NSActivityUserInitiated = (0x00FFFFFFULL | NSActivityIdleSystemSleepDisabled),
  NSActivityUserInitiatedAllowingIdleSystemSleep = (NSActivityUserInitiated & ~NSActivityIdleSystemSleepDisabled),
  NSActivityBackground = 0x000000FFULL,
  NSActivityLatencyCritical = 0xFF00000000ULL,
};


@interface NSProcessInfo (reaperhostadditions)
- (id<NSObject>)beginActivityWithOptions:(NSActivityOptions)options reason:(NSString *)reason;
- (void)endActivity:(id<NSObject>)activity;

@end

#endif

void SWELL_DisableAppNap(int disable)
{
  if (!g_swell_terminating && floor(NSFoundationVersionNumber) > 945.00) // 10.9+
  {
    static int cnt;
    static id obj;

    cnt += disable;

    @try
    {
      if (cnt > 0)
      {
        if (!obj)
        {
          const NSActivityOptions  v = NSActivityLatencyCritical |  NSActivityIdleSystemSleepDisabled;

          // beginActivityWithOptions returns an autoreleased object
          obj = [[NSProcessInfo processInfo] beginActivityWithOptions:v reason:@"SWELL_DisableAppNap"];
          if (obj) [obj retain];
        }
      }
      else
      {
        id a = obj;
        if (a)
        {
          // in case we crash somehow, dont' want obj sticking around pointing to a stale object
          obj = NULL;
          [[NSProcessInfo processInfo] endActivity:a];
          [a release]; // apparently releasing this is enough, without the endActivity call, but the docs are quite vague
        }
      }
    }
    @catch (NSException *exception) {
    }
    @catch (id ex) {
    }
  }
}


BOOL EnumDisplayMonitors(HDC hdc, const LPRECT r, MONITORENUMPROC proc,LPARAM lParam)
{
  // ignores hdc
  NSArray *screens = [NSScreen screens];
  const unsigned int ns = (unsigned int) [screens count];
  for (unsigned int x = 0; x < ns; x ++)
  {
    NSScreen *mon = [screens objectAtIndex:x];
    if (mon)
    {
      NSRect tr=[mon frame];
      RECT screen_rect,tmp;
      NSRECT_TO_RECT(&tmp,tr);
      if (r)
      {
        if (!IntersectRect(&screen_rect,r,&tmp))
          continue;
      }
      else
      {
        screen_rect = tmp;
      }
      if (!proc((HMONITOR)mon,hdc,&screen_rect,lParam)) break;
    }
  }

  return TRUE;
}

BOOL GetMonitorInfo(HMONITOR hmon, void *inf)
{
  if (!hmon) return FALSE;
  MONITORINFOEX *a = (MONITORINFOEX*)inf;
  if (a->cbSize < sizeof(MONITORINFO)) return FALSE;

  NSScreen *mon = (NSScreen *)hmon;
  NSRect tr=[mon frame];
  NSRECT_TO_RECT(&a->rcMonitor,tr);
  tr = [mon visibleFrame];
  NSRECT_TO_RECT(&a->rcWork,tr);
  a->dwFlags = 0;

  if (a->cbSize > sizeof(MONITORINFO))
  {
    const int maxlen = (int) (a->cbSize - sizeof(MONITORINFO));
    const int displayID = [[[mon deviceDescription] valueForKey:@"NSScreenNumber"] intValue];
    snprintf(a->szDevice,maxlen,"DisplayID %d",displayID);


    static bool init;
    static CFDictionaryRef (*_IODisplayCreateInfoDictionary)(io_service_t framebuffer, IOOptionBits options);

    if (!init)
    {
      init = true;
      void *lib = dlopen("/System/Library/Frameworks/IOKit.framework/Versions/Current/IOKit",RTLD_LAZY);
      if (lib)
        *(void **)&_IODisplayCreateInfoDictionary = dlsym(lib,"IODisplayCreateInfoDictionary");
    }

    if (_IODisplayCreateInfoDictionary)
    {
      NSDictionary *deviceInfo = (NSDictionary *)_IODisplayCreateInfoDictionary(CGDisplayIOServicePort(displayID), kIODisplayOnlyPreferredName);
      NSDictionary *names = [deviceInfo objectForKey:@"DisplayProductName"];
      if ([names count] > 0)
      {
        NSString *s = [names objectForKey:[[names allKeys] objectAtIndex:0]];
        if (s) SWELL_CFStringToCString(s,a->szDevice,maxlen);
      }
      [deviceInfo release];
    }
  }

  return TRUE;
}


#endif
