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 /* This file is part of the KDE libraries
  * SPDX-FileCopyrightText: 2009 Dario Freddi <drf at kde.org>
  * SPDX-FileCopyrightText: 2003 Tarkvara Design Inc. (from KVIrc source code)
  * SPDX-FileCopyrightText: 2008 Roman Jarosz <kedgedev at centrum.cz>
  * SPDX-FileCopyrightText: 2008 the Kopete developers <kopete-devel at kde.org>
  *
  * SPDX-License-Identifier: LGPL-2.1-or-later
  */
 
 #include "macpoller.h"
 
 // Why does Apple have to make this so complicated?
 static OSStatus LoadFrameworkBundle(CFStringRef framework, CFBundleRef *bundlePtr)
 {
     OSStatus err;
     FSRef frameworksFolderRef;
     CFURLRef baseURL;
     CFURLRef bundleURL;
 
     if (bundlePtr == nil) {
         return (-1);
     }
 
     *bundlePtr = nil;
 
     baseURL = nil;
     bundleURL = nil;
 
     err = FSFindFolder(kOnAppropriateDisk, kFrameworksFolderType, true, &frameworksFolderRef);
     if (err == noErr) {
         baseURL = CFURLCreateFromFSRef(kCFAllocatorSystemDefault, &frameworksFolderRef);
         if (baseURL == nil) {
             err = coreFoundationUnknownErr;
         }
     }
 
     if (err == noErr) {
         bundleURL = CFURLCreateCopyAppendingPathComponent(kCFAllocatorSystemDefault, baseURL, framework, false);
         if (bundleURL == nil) {
             err = coreFoundationUnknownErr;
         }
     }
 
     if (err == noErr) {
         *bundlePtr = CFBundleCreate(kCFAllocatorSystemDefault, bundleURL);
         if (*bundlePtr == nil) {
             err = coreFoundationUnknownErr;
         }
     }
 
     if (err == noErr) {
         if (!CFBundleLoadExecutable(*bundlePtr)) {
             err = coreFoundationUnknownErr;
         }
     }
 
     // Clean up.
     if (err != noErr && *bundlePtr != nil) {
         CFRelease(*bundlePtr);
         *bundlePtr = nil;
     }
 
     if (bundleURL != nil) {
         CFRelease(bundleURL);
     }
 
     if (baseURL != nil) {
         CFRelease(baseURL);
     }
 
     return err;
 }
 
 pascal void MacPoller::IdleTimerAction(EventLoopTimerRef, EventLoopIdleTimerMessage inState, void *inUserData)
 {
     Q_ASSERT(inUserData);
     switch (inState) {
     case kEventLoopIdleTimerStarted:
     case kEventLoopIdleTimerStopped:
         // Get invoked with this constant at the start of the idle period,
         // or whenever user activity cancels the idle.
         ((MacPoller *)inUserData)->m_secondsIdle = 0;
         ((MacPoller *)inUserData)->triggerResume();
         break;
     case kEventLoopIdleTimerIdling:
         // Called every time the timer fires (i.e. every second).
         ((MacPoller *)inUserData)->m_secondsIdle++;
         ((MacPoller *)inUserData)->poll();
         break;
     }
 }
 
 // Typedef for the function we're getting back from CFBundleGetFunctionPointerForName.
 typedef OSStatus (*InstallEventLoopIdleTimerPtr)(EventLoopRef inEventLoop,
                                                  EventTimerInterval inFireDelay,
                                                  EventTimerInterval inInterval,
                                                  EventLoopIdleTimerUPP inTimerProc,
                                                  void *inTimerData,
                                                  EventLoopTimerRef *outTimer);
 
 MacPoller::MacPoller(QObject *parent)
     : KAbstractIdleTimePoller(parent)
     , m_timerRef(0)
     , m_secondsIdle(0)
     , m_catch(false)
 {
 }
 
 MacPoller::~MacPoller()
 {
 }
 
 void MacPoller::unloadPoller()
 {
     RemoveEventLoopTimer(m_timerRef);
 }
 
 bool MacPoller::isAvailable()
 {
     return true;
 }
 
 bool MacPoller::setUpPoller()
 {
     // May already be init'ed.
     if (m_timerRef) {
         return true;
     }
 
     // According to the docs, InstallEventLoopIdleTimer is new in 10.2.
     // According to the headers, it has been around since 10.0.
     // One of them is lying.  We'll play it safe and weak-link the function.
 
     // Load the "Carbon.framework" bundle.
     CFBundleRef carbonBundle;
 
     if (LoadFrameworkBundle(CFSTR("Carbon.framework"), &carbonBundle) != noErr) {
         return false;
     }
 
     // Load the Mach-O function pointers for the routine we will be using.
     InstallEventLoopIdleTimerPtr myInstallEventLoopIdleTimer =
         (InstallEventLoopIdleTimerPtr)CFBundleGetFunctionPointerForName(carbonBundle, CFSTR("InstallEventLoopIdleTimer"));
 
     if (myInstallEventLoopIdleTimer == 0) {
         return false;
     }
 
     EventLoopIdleTimerUPP timerUPP = NewEventLoopIdleTimerUPP(IdleTimerAction);
     if ((*myInstallEventLoopIdleTimer)(GetMainEventLoop(), kEventDurationSecond, kEventDurationSecond, timerUPP, this, &m_timerRef)) {
         return true;
     }
 
     return false;
 }
 
 QList<int> MacPoller::timeouts() const
 {
     return m_timeouts;
 }
 
 void MacPoller::addTimeout(int nextTimeout)
 {
     m_timeouts.append(nextTimeout);
     poll();
 }
 
 int MacPoller::poll()
 {
     int idle = m_secondsIdle * 1000;
 
     // Check if we reached a timeout..
     for (int i : std::as_const(m_timeouts)) {
         if ((i - idle < 1000 && i > idle) || (idle - i < 1000 && idle > i)) {
             // Bingo!
             Q_EMIT timeoutReached(i);
         }
     }
 
     return idle;
 }
 
 int MacPoller::forcePollRequest()
 {
     return poll();
 }
 
 void MacPoller::removeTimeout(int timeout)
 {
     m_timeouts.removeOne(timeout);
     poll();
 }
 
 void MacPoller::catchIdleEvent()
 {
     m_catch = true;
 }
 
 void MacPoller::stopCatchingIdleEvents()
 {
     m_catch = false;
 }
 
 void MacPoller::triggerResume()
 {
     if (m_catch) {
         Q_EMIT resumingFromIdle();
         stopCatchingIdleEvents();
     }
 }
 
 void MacPoller::simulateUserActivity()
 {
     // TODO
 }
 
 #include "moc_macpoller.cpp"