/*
     File: ComponentBase.h
 Abstract: Part of CoreAudio Utility Classes
  Version: 1.1

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*/
#ifndef __ComponentBase_h__
#define __ComponentBase_h__

#include <new>
#include "CADebugMacros.h"
#include "CAXException.h"

#if !defined(__COREAUDIO_USE_FLAT_INCLUDES__)
	#include <CoreAudio/CoreAudioTypes.h>
	#include <AudioUnit/AudioUnit.h>

	#if !CA_USE_AUDIO_PLUGIN_ONLY
		#include <CoreServices/../Frameworks/CarbonCore.framework/Headers/Components.h>

		#if	(MAC_OS_X_VERSION_MAX_ALLOWED <= MAC_OS_X_VERSION_10_5)
			#define AudioComponentInstance			ComponentInstance
			#define AudioComponentDescription		ComponentDescription
			#define	AudioComponent					Component
		#endif
		Handle CMgr_GetComponentInstanceStorage(ComponentInstance aComponentInstance);
		void CMgr_SetComponentInstanceStorage(ComponentInstance aComponentInstance, Handle theStorage);
	#endif

	#if MAC_OS_X_VERSION_MAX_ALLOWED <= MAC_OS_X_VERSION_10_4
		typedef Float32 AudioUnitParameterValue;
	#endif
	#if COREAUDIOTYPES_VERSION < 1051
		typedef Float32 AudioUnitSampleType;
	#endif

	#if !TARGET_OS_WIN32
		#include <pthread.h>
	#endif

	#if TARGET_OS_WIN32
		#include "CAGuard.h"
	#endif
#else
	#include "CoreAudioTypes.h"
	#if !CA_USE_AUDIO_PLUGIN_ONLY
		#include "ComponentManagerDependenciesWin.h"
	#endif
	#include "AudioUnit.h"
	#include "CAGuard.h"
#endif

#ifndef COMPONENT_THROW
	#if VERBOSE_COMPONENT_THROW
		#define COMPONENT_THROW(throw_err) \
			do { DebugMessage(#throw_err); throw static_cast<OSStatus>(throw_err); } while (0)
	#else
		#define COMPONENT_THROW(throw_err) \
			throw static_cast<OSStatus>(throw_err)
	#endif
#endif

#define COMPONENT_CATCH \
	catch (const CAXException &ex) { result = ex.mError; } \
	catch (std::bad_alloc &) { result = kAudio_MemFullError; } \
	catch (OSStatus catch_err) { result = catch_err; } \
	catch (OSErr catch_err) { result = catch_err; } \
	catch (...) { result = -1; }

/*! @class ComponentBase */
class ComponentBase {
public:
	// classic MacErrors
	enum { noErr = 0};

	/*! @ctor ComponentBase */
				ComponentBase(AudioComponentInstance inInstance);

	/*! @dtor ~ComponentBase */
	virtual 	~ComponentBase();

	/*! @method PostConstructor */
	virtual void			PostConstructor();

	/*! @method PreDestructor */
	virtual void			PreDestructor();

#if !CA_USE_AUDIO_PLUGIN_ONLY
	/*! @method Version */
	virtual OSStatus		Version();

	/*! @method ComponentEntryDispatch */
	static OSStatus		ComponentEntryDispatch(ComponentParameters *p, ComponentBase *This);

	/*! GetSelectorForCanDo */
	static SInt16		GetSelectorForCanDo(ComponentParameters *params);
#endif

	/*! @method GetComponentInstance */
	AudioComponentInstance		GetComponentInstance() const { return mComponentInstance; }

	/*! @method GetComponentDescription */
	AudioComponentDescription	GetComponentDescription() const;

	// This global variable is so that new instances know how they were instantiated: via the Component Manager,
	// or as AudioComponents. It's ugly, but preferable to altering the constructor of every class in the hierarchy.
	// It's safe because construction is protected by ComponentInitLocker.
	enum EInstanceType { kComponentMgrInstance, kAudioComponentInstance };
	static EInstanceType sNewInstanceType;

	/*! @method IsPluginObject */
	bool			IsPluginObject () const { return mInstanceType == kAudioComponentInstance; }
	/*! @method IsCMgrObject */
	bool			IsCMgrObject () const { return mInstanceType == kComponentMgrInstance; }

	/*! @method AP_Open */
	static OSStatus AP_Open(void *self, AudioUnit compInstance);

	/*! @method AP_Close */
	static OSStatus AP_Close(void *self);

protected:
	/*! @var mComponentInstance */
	AudioComponentInstance		mComponentInstance;
	EInstanceType				mInstanceType;
};

class ComponentInitLocker
{
#if TARGET_OS_MAC
public:
	ComponentInitLocker()
	{
		pthread_once(&sOnce, InitComponentInitLocker);
		pthread_mutex_lock(&sComponentOpenMutex);
		mPreviousNewInstanceType = ComponentBase::sNewInstanceType;
	}
	~ComponentInitLocker()
	{
		ComponentBase::sNewInstanceType = mPreviousNewInstanceType;
		pthread_mutex_unlock(&sComponentOpenMutex);
	}

	// There are situations (11844772) where we need to be able to release the lock early.
	class Unlocker {
	public:
		Unlocker()
		{
			pthread_mutex_unlock(&sComponentOpenMutex);
		}
		~Unlocker()
		{
			pthread_mutex_lock(&sComponentOpenMutex);
		}
	};

private:
	static pthread_mutex_t sComponentOpenMutex;
	static pthread_once_t sOnce;
	static void InitComponentInitLocker();

#elif TARGET_OS_WIN32
public:
	bool sNeedsUnlocking;
	ComponentInitLocker() { sNeedsUnlocking = sComponentOpenGuard.Lock(); }
	~ComponentInitLocker() { if(sNeedsUnlocking) { sComponentOpenGuard.Unlock(); } }
private:
	static CAGuard	sComponentOpenGuard;
#endif

private:
	ComponentBase::EInstanceType	mPreviousNewInstanceType;
};

/*! @class AudioComponentPlugInInstance */
struct AudioComponentPlugInInstance {
	AudioComponentPlugInInterface		mPlugInInterface;
	void *								(*mConstruct)(void *memory, AudioComponentInstance ci);
	void								(*mDestruct)(void *memory);
	void *								mPad[2];				// pad to a 16-byte boundary (in either 32 or 64 bit mode)
	UInt32								mInstanceStorage;		// the ACI implementation object is constructed into this memory
																// this member is just a placeholder. it is aligned to a 16byte boundary
};

/*! @class APFactory */
template <class APMethodLookup, class Implementor>
class APFactory {
public:
	static void *Construct(void *memory, AudioComponentInstance compInstance)
	{
		return new(memory) Implementor(compInstance);
	}

	static void Destruct(void *memory)
	{
		((Implementor *)memory)->~Implementor();
	}

	// This is the AudioComponentFactoryFunction. It returns an AudioComponentPlugInInstance.
	// The actual implementation object is not created until Open().
	static AudioComponentPlugInInterface *Factory(const AudioComponentDescription * /* inDesc */)
	{
		AudioComponentPlugInInstance *acpi =
				(AudioComponentPlugInInstance *)malloc( offsetof(AudioComponentPlugInInstance, mInstanceStorage) + sizeof(Implementor) );
		acpi->mPlugInInterface.Open = ComponentBase::AP_Open;
		acpi->mPlugInInterface.Close = ComponentBase::AP_Close;
		acpi->mPlugInInterface.Lookup = APMethodLookup::Lookup;
		acpi->mPlugInInterface.reserved = NULL;
		acpi->mConstruct = Construct;
		acpi->mDestruct = Destruct;
		acpi->mPad[0] = NULL;
		acpi->mPad[1] = NULL;
		return (AudioComponentPlugInInterface*)acpi;
	}

	// This is for runtime registration (not for plug-ins loaded from bundles).
	static AudioComponent Register(UInt32 type, UInt32 subtype, UInt32 manuf, CFStringRef name, UInt32 vers, UInt32 flags=0)
	{
		AudioComponentDescription desc = { type, subtype, manuf, flags, 0 };
		return AudioComponentRegister(&desc, name, vers, Factory);
	}
};

#if !CA_USE_AUDIO_PLUGIN_ONLY
/*! @class ComponentEntryPoint
 *	@discussion This is only used for a component manager version
*/
template <class Class>
class ComponentEntryPoint {
public:
	/*! @method Dispatch */
	static OSStatus Dispatch(ComponentParameters *params, Class *obj)
	{
		OSStatus result = noErr;

		try {
			if (params->what == kComponentOpenSelect) {
				// solve a host of initialization thread safety issues.
				ComponentInitLocker lock;

				ComponentBase::sNewInstanceType = ComponentBase::kComponentMgrInstance;
				ComponentInstance ci = (ComponentInstance)(params->params[0]);
				Class *This = new Class((AudioComponentInstance)ci);
				This->PostConstructor();	// allows base class to do additional initialization
											// once the derived class is fully constructed

				CMgr_SetComponentInstanceStorage(ci, (Handle)This);
			} else
				result = Class::ComponentEntryDispatch(params, obj);
		}
		COMPONENT_CATCH

		return result;
	}

	/*! @method Register */
	static Component Register(OSType compType, OSType subType, OSType manufacturer)
	{
		ComponentDescription	description = {compType, subType, manufacturer, 0, 0};
		Component	component = RegisterComponent(&description, (ComponentRoutineUPP) Dispatch, registerComponentGlobal, NULL, NULL, NULL);
		if (component != NULL) {
			SetDefaultComponent(component, defaultComponentAnyFlagsAnyManufacturerAnySubType);
		}
		return component;
	}
};

// NOTE: Component Mgr is deprecated in ML.
// this macro should not be used with new audio components
// it is only for backwards compatibility with Lion and SL.
// this macro registers both a plugin and a component mgr version.
#define AUDIOCOMPONENT_ENTRY(FactoryType, Class) \
    extern "C" OSStatus Class##Entry(ComponentParameters *params, Class *obj); \
    extern "C" OSStatus Class##Entry(ComponentParameters *params, Class *obj) { \
        return ComponentEntryPoint<Class>::Dispatch(params, obj); \
    } \
    extern "C" void * Class##Factory(const AudioComponentDescription *inDesc); \
    extern "C" void * Class##Factory(const AudioComponentDescription *inDesc) { \
        return FactoryType<Class>::Factory(inDesc); \
    }
    // the only component we still support are the carbon based view components
    // you should be using this macro now to exclusively register those types
#define VIEW_COMPONENT_ENTRY(Class) \
    extern "C" OSStatus Class##Entry(ComponentParameters *params, Class *obj); \
    extern "C" OSStatus Class##Entry(ComponentParameters *params, Class *obj) { \
        return ComponentEntryPoint<Class>::Dispatch(params, obj); \
    }

	/*! @class ComponentRegistrar */
template <class Class, OSType Type, OSType Subtype, OSType Manufacturer>
class ComponentRegistrar {
public:
	/*! @ctor ComponentRegistrar */
	ComponentRegistrar() { ComponentEntryPoint<Class>::Register(Type, Subtype, Manufacturer); }
};

#define	COMPONENT_REGISTER(Class,Type,Subtype,Manufacturer) \
	static ComponentRegistrar<Class, Type, Subtype, Manufacturer>	gRegistrar##Class
#else
#define COMPONENT_ENTRY(Class)
#define COMPONENT_REGISTER(Class)
// this macro is used to generate the Entry Point for a given Audio Plugin
// you should be using this macro now with audio components
#define AUDIOCOMPONENT_ENTRY(FactoryType, Class) \
    extern "C" void * Class##Factory(const AudioComponentDescription *inDesc); \
    extern "C" void * Class##Factory(const AudioComponentDescription *inDesc) { \
        return FactoryType<Class>::Factory(inDesc); \
    }

#endif // !CA_USE_AUDIO_PLUGIN_ONLY


#endif // __ComponentBase_h__