#define NO_MIN_MAX 1
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <ShlObj.h>

#include <util/dstr.h>

typedef unsigned long      UInt32;
typedef signed long        SInt32;
typedef signed long long   SInt64;
typedef double             Float64;

typedef SInt32             OSStatus;
typedef unsigned char      Boolean;

typedef UInt32 AudioFormatPropertyID;

enum {
	kVariableLengthArray = 1
};

struct OpaqueAudioConverter;
typedef struct OpaqueAudioConverter *AudioConverterRef;
typedef UInt32 AudioConverterPropertyID;

struct AudioValueRange {
	Float64 mMinimum;
	Float64 mMaximum;
};
typedef struct AudioValueRange AudioValueRange;

struct AudioBuffer {
	UInt32  mNumberChannels;
	UInt32  mDataByteSize;
	void*   mData;
};
typedef struct AudioBuffer AudioBuffer;

struct AudioBufferList {
	UInt32      mNumberBuffers;
	AudioBuffer mBuffers[kVariableLengthArray];
};
typedef struct AudioBufferList AudioBufferList;

struct AudioStreamBasicDescription {
	Float64 mSampleRate;
	UInt32  mFormatID;
	UInt32  mFormatFlags;
	UInt32  mBytesPerPacket;
	UInt32  mFramesPerPacket;
	UInt32  mBytesPerFrame;
	UInt32  mChannelsPerFrame;
	UInt32  mBitsPerChannel;
	UInt32  mReserved;
};
typedef struct AudioStreamBasicDescription AudioStreamBasicDescription;

struct AudioStreamPacketDescription {
	SInt64  mStartOffset;
	UInt32  mVariableFramesInPacket;
	UInt32  mDataByteSize;
};
typedef struct AudioStreamPacketDescription AudioStreamPacketDescription;

typedef OSStatus (*AudioConverterComplexInputDataProc) (
	AudioConverterRef             inAudioConverter,
	UInt32                        *ioNumberDataPackets,
	AudioBufferList               *ioData,
	AudioStreamPacketDescription  **outDataPacketDescription,
	void                          *inUserData
);

enum {
	kAudioCodecPropertyNameCFString                        = 'lnam',
	kAudioCodecPropertyManufacturerCFString                = 'lmak',
	kAudioCodecPropertyFormatCFString                      = 'lfor',
	//kAudioCodecPropertyHasVariablePacketByteSizes          = 'vpk?',
	kAudioCodecPropertySupportedInputFormats               = 'ifm#',
	kAudioCodecPropertySupportedOutputFormats              = 'ofm#',
	kAudioCodecPropertyAvailableInputSampleRates           = 'aisr',
	kAudioCodecPropertyAvailableOutputSampleRates          = 'aosr',
	kAudioCodecPropertyAvailableBitRateRange               = 'abrt',
	kAudioCodecPropertyMinimumNumberInputPackets           = 'mnip',
	kAudioCodecPropertyMinimumNumberOutputPackets          = 'mnop',
	kAudioCodecPropertyAvailableNumberChannels             = 'cmnc',
	kAudioCodecPropertyDoesSampleRateConversion            = 'lmrc',
	kAudioCodecPropertyAvailableInputChannelLayoutTags     = 'aicl',
	kAudioCodecPropertyAvailableOutputChannelLayoutTags    = 'aocl',
	kAudioCodecPropertyInputFormatsForOutputFormat         = 'if4o',
	kAudioCodecPropertyOutputFormatsForInputFormat         = 'of4i',
	kAudioCodecPropertyFormatInfo                          = 'acfi',
};

enum {
	kAudioCodecPropertyInputBufferSize               = 'tbuf',
	kAudioCodecPropertyPacketFrameSize               = 'pakf',
	kAudioCodecPropertyMaximumPacketByteSize         = 'pakb',
	kAudioCodecPropertyCurrentInputFormat            = 'ifmt',
	kAudioCodecPropertyCurrentOutputFormat           = 'ofmt',
	kAudioCodecPropertyMagicCookie                   = 'kuki',
	kAudioCodecPropertyUsedInputBufferSize           = 'ubuf',
	kAudioCodecPropertyIsInitialized                 = 'init',
	kAudioCodecPropertyCurrentTargetBitRate          = 'brat',
	kAudioCodecPropertyCurrentInputSampleRate        = 'cisr',
	kAudioCodecPropertyCurrentOutputSampleRate       = 'cosr',
	kAudioCodecPropertyQualitySetting                = 'srcq',
	kAudioCodecPropertyApplicableBitRateRange        = 'brta',
	kAudioCodecPropertyApplicableInputSampleRates    = 'isra',
	kAudioCodecPropertyApplicableOutputSampleRates   = 'osra',
	kAudioCodecPropertyPaddedZeros                   = 'pad0',
	kAudioCodecPropertyPrimeMethod                   = 'prmm',
	kAudioCodecPropertyPrimeInfo                     = 'prim',
	kAudioCodecPropertyCurrentInputChannelLayout     = 'icl ',
	kAudioCodecPropertyCurrentOutputChannelLayout    = 'ocl ',
	kAudioCodecPropertySettings                      = 'acs ',
	kAudioCodecPropertyFormatList                    = 'acfl',
	kAudioCodecPropertyBitRateControlMode            = 'acbf',
	kAudioCodecPropertySoundQualityForVBR            = 'vbrq',
	kAudioCodecPropertyMinimumDelayMode              = 'mdel'
};

enum {
	kAudioCodecBitRateControlMode_Constant                   = 0,
	kAudioCodecBitRateControlMode_LongTermAverage            = 1,
	kAudioCodecBitRateControlMode_VariableConstrained        = 2,
	kAudioCodecBitRateControlMode_Variable                   = 3,
};

enum {
	kAudioFormatLinearPCM               = 'lpcm',
	kAudioFormatAC3                     = 'ac-3',
	kAudioFormat60958AC3                = 'cac3',
	kAudioFormatAppleIMA4               = 'ima4',
	kAudioFormatMPEG4AAC                = 'aac ',
	kAudioFormatMPEG4CELP               = 'celp',
	kAudioFormatMPEG4HVXC               = 'hvxc',
	kAudioFormatMPEG4TwinVQ             = 'twvq',
	kAudioFormatMACE3                   = 'MAC3',
	kAudioFormatMACE6                   = 'MAC6',
	kAudioFormatULaw                    = 'ulaw',
	kAudioFormatALaw                    = 'alaw',
	kAudioFormatQDesign                 = 'QDMC',
	kAudioFormatQDesign2                = 'QDM2',
	kAudioFormatQUALCOMM                = 'Qclp',
	kAudioFormatMPEGLayer1              = '.mp1',
	kAudioFormatMPEGLayer2              = '.mp2',
	kAudioFormatMPEGLayer3              = '.mp3',
	kAudioFormatTimeCode                = 'time',
	kAudioFormatMIDIStream              = 'midi',
	kAudioFormatParameterValueStream    = 'apvs',
	kAudioFormatAppleLossless           = 'alac',
	kAudioFormatMPEG4AAC_HE             = 'aach',
	kAudioFormatMPEG4AAC_LD             = 'aacl',
	kAudioFormatMPEG4AAC_ELD            = 'aace',
	kAudioFormatMPEG4AAC_ELD_SBR        = 'aacf',
	kAudioFormatMPEG4AAC_ELD_V2         = 'aacg',    
	kAudioFormatMPEG4AAC_HE_V2          = 'aacp',
	kAudioFormatMPEG4AAC_Spatial        = 'aacs',
	kAudioFormatAMR                     = 'samr',
	kAudioFormatAudible                 = 'AUDB',
	kAudioFormatiLBC                    = 'ilbc',
	kAudioFormatDVIIntelIMA             = 0x6D730011,
	kAudioFormatMicrosoftGSM            = 0x6D730031,
	kAudioFormatAES3                    = 'aes3'
};

enum {
	kAudioFormatFlagIsFloat                     = (1L << 0),
	kAudioFormatFlagIsBigEndian                 = (1L << 1),
	kAudioFormatFlagIsSignedInteger             = (1L << 2),
	kAudioFormatFlagIsPacked                    = (1L << 3),
	kAudioFormatFlagIsAlignedHigh               = (1L << 4),
	kAudioFormatFlagIsNonInterleaved            = (1L << 5),
	kAudioFormatFlagIsNonMixable                = (1L << 6),
	kAudioFormatFlagsAreAllClear                = (1L << 31),

	kLinearPCMFormatFlagIsFloat                 =
					kAudioFormatFlagIsFloat,
	kLinearPCMFormatFlagIsBigEndian             =
					kAudioFormatFlagIsBigEndian,
	kLinearPCMFormatFlagIsSignedInteger         =
					kAudioFormatFlagIsSignedInteger,
	kLinearPCMFormatFlagIsPacked                =
					kAudioFormatFlagIsPacked,
	kLinearPCMFormatFlagIsAlignedHigh           =
					kAudioFormatFlagIsAlignedHigh,
	kLinearPCMFormatFlagIsNonInterleaved        =
					kAudioFormatFlagIsNonInterleaved,
	kLinearPCMFormatFlagIsNonMixable            =
					kAudioFormatFlagIsNonMixable,
	kLinearPCMFormatFlagsAreAllClear            =
					kAudioFormatFlagsAreAllClear,

	kAppleLosslessFormatFlag_16BitSourceData    = 1,
	kAppleLosslessFormatFlag_20BitSourceData    = 2,
	kAppleLosslessFormatFlag_24BitSourceData    = 3,
	kAppleLosslessFormatFlag_32BitSourceData    = 4
};

enum {
	kAudioFormatFlagsNativeEndian               = 0,
};

enum {
	// AudioStreamBasicDescription structure properties
	kAudioFormatProperty_FormatInfo                       = 'fmti',
	kAudioFormatProperty_FormatName                       = 'fnam',
	kAudioFormatProperty_EncodeFormatIDs                  = 'acof',
	kAudioFormatProperty_DecodeFormatIDs                  = 'acif',
	kAudioFormatProperty_FormatList                       = 'flst',
	kAudioFormatProperty_ASBDFromESDS                     = 'essd',
	kAudioFormatProperty_ChannelLayoutFromESDS            = 'escl',
	kAudioFormatProperty_OutputFormatList                 = 'ofls',
	kAudioFormatProperty_Encoders                         = 'aven',
	kAudioFormatProperty_Decoders                         = 'avde',
	kAudioFormatProperty_FormatIsVBR                      = 'fvbr',
	kAudioFormatProperty_FormatIsExternallyFramed         = 'fexf',
	kAudioFormatProperty_AvailableEncodeBitRates          = 'aebr',
	kAudioFormatProperty_AvailableEncodeSampleRates       = 'aesr',
	kAudioFormatProperty_AvailableEncodeChannelLayoutTags = 'aecl',
	kAudioFormatProperty_AvailableEncodeNumberChannels    = 'avnc',
	kAudioFormatProperty_ASBDFromMPEGPacket               = 'admp',
	//
	// AudioChannelLayout structure properties
	kAudioFormatProperty_BitmapForLayoutTag               = 'bmtg',
	kAudioFormatProperty_MatrixMixMap                     = 'mmap',
	kAudioFormatProperty_ChannelMap                       = 'chmp',
	kAudioFormatProperty_NumberOfChannelsForLayout        = 'nchm',
	kAudioFormatProperty_ValidateChannelLayout            = 'vacl',
	kAudioFormatProperty_ChannelLayoutForTag              = 'cmpl',
	kAudioFormatProperty_TagForChannelLayout              = 'cmpt',
	kAudioFormatProperty_ChannelLayoutName                = 'lonm',
	kAudioFormatProperty_ChannelLayoutSimpleName          = 'lsnm',
	kAudioFormatProperty_ChannelLayoutForBitmap           = 'cmpb',
	kAudioFormatProperty_ChannelName                      = 'cnam',
	kAudioFormatProperty_ChannelShortName                 = 'csnm',
	kAudioFormatProperty_TagsForNumberOfChannels          = 'tagc',
	kAudioFormatProperty_PanningMatrix                    = 'panm',
	kAudioFormatProperty_BalanceFade                      = 'balf',
	//
	// ID3 tag (MP3 metadata) properties
	kAudioFormatProperty_ID3TagSize                       = 'id3s',
	kAudioFormatProperty_ID3TagToDictionary               = 'id3d'
};

enum {
	kAudioConverterPropertyMinimumInputBufferSize    = 'mibs',
	kAudioConverterPropertyMinimumOutputBufferSize   = 'mobs',
	kAudioConverterPropertyMaximumInputBufferSize    = 'xibs',
	kAudioConverterPropertyMaximumInputPacketSize    = 'xips',
	kAudioConverterPropertyMaximumOutputPacketSize   = 'xops',
	kAudioConverterPropertyCalculateInputBufferSize  = 'cibs',
	kAudioConverterPropertyCalculateOutputBufferSize = 'cobs',
	kAudioConverterPropertyInputCodecParameters      = 'icdp',
	kAudioConverterPropertyOutputCodecParameters     = 'ocdp',
	kAudioConverterSampleRateConverterAlgorithm      = 'srci',
	kAudioConverterSampleRateConverterComplexity     = 'srca',
	kAudioConverterSampleRateConverterQuality        = 'srcq',
	kAudioConverterSampleRateConverterInitialPhase   = 'srcp',
	kAudioConverterCodecQuality                      = 'cdqu',
	kAudioConverterPrimeMethod                       = 'prmm',
	kAudioConverterPrimeInfo                         = 'prim',
	kAudioConverterChannelMap                        = 'chmp',
	kAudioConverterDecompressionMagicCookie          = 'dmgc',
	kAudioConverterCompressionMagicCookie            = 'cmgc',
	kAudioConverterEncodeBitRate                     = 'brat',
	kAudioConverterEncodeAdjustableSampleRate        = 'ajsr',
	kAudioConverterInputChannelLayout                = 'icl ',
	kAudioConverterOutputChannelLayout               = 'ocl ',
	kAudioConverterApplicableEncodeBitRates          = 'aebr',
	kAudioConverterAvailableEncodeBitRates           = 'vebr',
	kAudioConverterApplicableEncodeSampleRates       = 'aesr',
	kAudioConverterAvailableEncodeSampleRates        = 'vesr',
	kAudioConverterAvailableEncodeChannelLayoutTags  = 'aecl',
	kAudioConverterCurrentOutputStreamDescription    = 'acod',
	kAudioConverterCurrentInputStreamDescription     = 'acid',
	kAudioConverterPropertySettings                  = 'acps',
	kAudioConverterPropertyBitDepthHint              = 'acbd',
	kAudioConverterPropertyFormatList                = 'flst',
};

enum {
	kAudioConverterQuality_Max     = 0x7F,
	kAudioConverterQuality_High    = 0x60,
	kAudioConverterQuality_Medium  = 0x40,
	kAudioConverterQuality_Low     = 0x20,
	kAudioConverterQuality_Min     = 0
};

enum {
	kAudio_UnimplementedError     = -4,
	kAudio_FileNotFoundError      = -43,
	kAudio_FilePermissionError    = -54,
	kAudio_TooManyFilesOpenError  = -42,
	kAudio_BadFilePathError       = '!pth',     // 0x21707468, 561017960
	kAudio_ParamError             = -50,
	kAudio_MemFullError           = -108,

	kAudioConverterErr_FormatNotSupported       = 'fmt?',
	kAudioConverterErr_OperationNotSupported    = 0x6F703F3F,
	// 'op??', integer used because of trigraph
	kAudioConverterErr_PropertyNotSupported     = 'prop',
	kAudioConverterErr_InvalidInputSize         = 'insz',
	kAudioConverterErr_InvalidOutputSize        = 'otsz',
	// e.g. byte size is not a multiple of the frame size
	kAudioConverterErr_UnspecifiedError         = 'what',
	kAudioConverterErr_BadPropertySizeError     = '!siz',
	kAudioConverterErr_RequiresPacketDescriptionsError = '!pkd',
	kAudioConverterErr_InputSampleRateOutOfRange    = '!isr',
	kAudioConverterErr_OutputSampleRateOutOfRange   = '!osr'
};

typedef OSStatus (*AudioConverterNew_t) (
	const AudioStreamBasicDescription *inSourceFormat,
	const AudioStreamBasicDescription *inDestinationFormat,
	AudioConverterRef                 *outAudioConverter
);

typedef OSStatus (*AudioConverterDispose_t) (
	AudioConverterRef inAudioConverter
);

typedef OSStatus (*AudioConverterReset_t) (
	AudioConverterRef inAudioConverter
);

typedef OSStatus (*AudioConverterGetProperty_t) (
	AudioConverterRef        inAudioConverter,
	AudioConverterPropertyID inPropertyID,
	UInt32                   *ioPropertyDataSize,
	void                     *outPropertyData
);

typedef OSStatus (*AudioConverterGetPropertyInfo_t) (
	AudioConverterRef        inAudioConverter,
	AudioConverterPropertyID inPropertyID,
	UInt32                   *outSize,
	Boolean                  *outWritable
);

typedef OSStatus (*AudioConverterSetProperty_t) (
	AudioConverterRef        inAudioConverter,
	AudioConverterPropertyID inPropertyID,
	UInt32                   inPropertyDataSize,
	const void               *inPropertyData
);

typedef OSStatus (*AudioConverterFillComplexBuffer_t) (
	AudioConverterRef                  inAudioConverter,
	AudioConverterComplexInputDataProc inInputDataProc,
	void                               *inInputDataProcUserData,
	UInt32                             *ioOutputDataPacketSize,
	AudioBufferList                    *outOutputData,
	AudioStreamPacketDescription       *outPacketDescription
);

typedef OSStatus (*AudioFormatGetProperty_t) (
	AudioFormatPropertyID inPropertyID,
	UInt32                inSpecifierSize,
	const void            *inSpecifier,
	UInt32                *ioPropertyDataSize,
	void                  *outPropertyData
);

typedef OSStatus (*AudioFormatGetPropertyInfo_t) (
	AudioFormatPropertyID inPropertyID,
	UInt32                inSpecifierSize,
	const void            *inSpecifier,
	UInt32                *outPropertyDataSize
);

static AudioConverterNew_t AudioConverterNew = NULL;
static AudioConverterDispose_t AudioConverterDispose = NULL;
static AudioConverterReset_t AudioConverterReset = NULL;
static AudioConverterGetProperty_t AudioConverterGetProperty = NULL;
static AudioConverterGetPropertyInfo_t AudioConverterGetPropertyInfo = NULL;
static AudioConverterSetProperty_t AudioConverterSetProperty = NULL;
static AudioConverterFillComplexBuffer_t AudioConverterFillComplexBuffer = NULL;
static AudioFormatGetProperty_t AudioFormatGetProperty = NULL;
static AudioFormatGetPropertyInfo_t AudioFormatGetPropertyInfo = NULL;

static HMODULE audio_toolbox = NULL;

static void release_lib(void)
{
#define RELEASE_LIB(x) if (x) { \
		FreeLibrary(x); \
		x = NULL; \
	}

	RELEASE_LIB(audio_toolbox);
#undef RELEASE_LIB
}

static bool load_lib(void)
{
	PWSTR common_path;
	if (SHGetKnownFolderPath(FOLDERID_ProgramFilesCommon, 0, NULL,
				&common_path) != S_OK) {
		CA_LOG(LOG_WARNING, "Could not retrieve common files path");
		return false;
	}

	struct dstr path = { 0 };
	dstr_printf(&path, "%S\\Apple\\Apple Application Support", common_path);
	CoTaskMemFree(common_path);

	wchar_t *w_path = dstr_to_wcs(&path);
	dstr_free(&path);

	SetDllDirectory(w_path);
	bfree(w_path);

#define LOAD_LIB(x, n) x = LoadLibrary(TEXT(n)); \
	if (!x) \
		CA_LOG(LOG_DEBUG, "Failed loading library '" n "'");

	LOAD_LIB(audio_toolbox, "CoreAudioToolbox.dll");
#undef LOAD_LIB

	SetDllDirectory(NULL);

	if (audio_toolbox)
		return true;

	release_lib();
	return false;
}

static void unload_core_audio(void)
{
	AudioConverterNew = NULL;
	AudioConverterDispose = NULL;
	AudioConverterReset = NULL;
	AudioConverterGetProperty = NULL;
	AudioConverterGetPropertyInfo = NULL;
	AudioConverterSetProperty = NULL;
	AudioConverterFillComplexBuffer = NULL;
	AudioFormatGetProperty = NULL;
	AudioFormatGetPropertyInfo = NULL;

	release_lib();
}

#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable: 4706)
#endif
static bool load_core_audio(void)
{
	if (!load_lib())
		return false;

#define LOAD_SYM_FROM_LIB(sym, lib, dll) \
	if (!(sym = (sym ## _t)GetProcAddress(lib, #sym))) { \
		DWORD err = GetLastError(); \
		CA_LOG(LOG_ERROR, "Couldn't load " #sym " from " \
				dll ": %lu (0x%lx)", err, err); \
		goto unload_everything; \
	}

#define LOAD_SYM(sym) \
	LOAD_SYM_FROM_LIB(sym, audio_toolbox, "CoreAudioToolbox.dll")
	LOAD_SYM(AudioConverterNew);
	LOAD_SYM(AudioConverterDispose);
	LOAD_SYM(AudioConverterReset);
	LOAD_SYM(AudioConverterGetProperty);
	LOAD_SYM(AudioConverterGetPropertyInfo);
	LOAD_SYM(AudioConverterSetProperty);
	LOAD_SYM(AudioConverterFillComplexBuffer);
	LOAD_SYM(AudioFormatGetProperty);
	LOAD_SYM(AudioFormatGetPropertyInfo);
#undef LOAD_SYM

	return true;

unload_everything:
	unload_core_audio();

	return false;
}
#ifdef _MSC_VER
#pragma warning(pop)
#endif