/*
*	File:		Pop2.cpp
*	
*	Version:	1.0
* 
*	Created:	9/19/22
*	
*	Copyright:  Copyright © 2022 Airwindows, Airwindows uses the MIT license
* 
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/*=============================================================================
	Pop2.cpp
	
=============================================================================*/
#include "Pop2.h"


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

AUDIOCOMPONENT_ENTRY(AUBaseFactory, Pop2)


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Pop2::Pop2
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Pop2::Pop2(AudioUnit component)
	: AUEffectBase(component)
{
	CreateElements();
	Globals()->UseIndexedParameters(kNumberOfParameters);
	SetParameter(kParam_One, kDefaultValue_ParamOne );
	SetParameter(kParam_Two, kDefaultValue_ParamTwo );
	SetParameter(kParam_Three, kDefaultValue_ParamThree );
	SetParameter(kParam_Four, kDefaultValue_ParamFour );
	SetParameter(kParam_Five, kDefaultValue_ParamFive );
         
#if AU_DEBUG_DISPATCHER
	mDebugDispatcher = new AUDebugDispatcher (this);
#endif
	
}


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Pop2::GetParameterValueStrings
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult			Pop2::GetParameterValueStrings(AudioUnitScope		inScope,
                                                                AudioUnitParameterID	inParameterID,
                                                                CFArrayRef *		outStrings)
{
        
    return kAudioUnitErr_InvalidProperty;
}



//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Pop2::GetParameterInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult			Pop2::GetParameterInfo(AudioUnitScope		inScope,
                                                        AudioUnitParameterID	inParameterID,
                                                        AudioUnitParameterInfo	&outParameterInfo )
{
	ComponentResult result = noErr;

	outParameterInfo.flags = 	kAudioUnitParameterFlag_IsWritable
						|		kAudioUnitParameterFlag_IsReadable;
    
    if (inScope == kAudioUnitScope_Global) {
        switch(inParameterID)
        {
           case kParam_One:
                AUBase::FillInParameterName (outParameterInfo, kParameterOneName, false);
                outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
                outParameterInfo.minValue = 0.0;
                outParameterInfo.maxValue = 1.0;
                outParameterInfo.defaultValue = kDefaultValue_ParamOne;
                break;
            case kParam_Two:
                AUBase::FillInParameterName (outParameterInfo, kParameterTwoName, false);
                outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
                outParameterInfo.minValue = 0.0;
                outParameterInfo.maxValue = 1.0;
                outParameterInfo.defaultValue = kDefaultValue_ParamTwo;
                break;
            case kParam_Three:
                AUBase::FillInParameterName (outParameterInfo, kParameterThreeName, false);
                outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
                outParameterInfo.minValue = 0.0;
                outParameterInfo.maxValue = 1.0;
                outParameterInfo.defaultValue = kDefaultValue_ParamThree;
                break;
           case kParam_Four:
                AUBase::FillInParameterName (outParameterInfo, kParameterFourName, false);
                outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
                outParameterInfo.minValue = 0.0;
                outParameterInfo.maxValue = 1.0;
                outParameterInfo.defaultValue = kDefaultValue_ParamFour;
                break;
           case kParam_Five:
                AUBase::FillInParameterName (outParameterInfo, kParameterFiveName, false);
                outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
                outParameterInfo.minValue = 0.0;
                outParameterInfo.maxValue = 1.0;
                outParameterInfo.defaultValue = kDefaultValue_ParamFive;
                break;
           default:
                result = kAudioUnitErr_InvalidParameter;
                break;
            }
	} else {
        result = kAudioUnitErr_InvalidParameter;
    }
    


	return result;
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Pop2::GetPropertyInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult			Pop2::GetPropertyInfo (AudioUnitPropertyID	inID,
                                                        AudioUnitScope		inScope,
                                                        AudioUnitElement	inElement,
                                                        UInt32 &		outDataSize,
                                                        Boolean &		outWritable)
{
	return AUEffectBase::GetPropertyInfo (inID, inScope, inElement, outDataSize, outWritable);
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Pop2::GetProperty
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult			Pop2::GetProperty(	AudioUnitPropertyID inID,
                                                        AudioUnitScope 		inScope,
                                                        AudioUnitElement 	inElement,
                                                        void *			outData )
{
	return AUEffectBase::GetProperty (inID, inScope, inElement, outData);
}

//	Pop2::Initialize
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult Pop2::Initialize()
{
    ComponentResult result = AUEffectBase::Initialize();
    if (result == noErr)
        Reset(kAudioUnitScope_Global, 0);
    return result;
}

#pragma mark ____Pop2EffectKernel



//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Pop2::Pop2Kernel::Reset()
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void		Pop2::Pop2Kernel::Reset()
{
	muVary = 0.0;
	muAttack = 0.0;
	muNewSpeed = 1000.0;
	muSpeedA = 1000.0;
	muSpeedB = 1000.0;
	muCoefficientA = 1.0;
	muCoefficientB = 1.0;
	flip = false;
	
	lastSample = 0.0;
	wasPosClip = false;
	wasNegClip = false;
	for (int x = 0; x < 16; x++) intermediate[x] = 0.0;
	
	fpd = 1.0; while (fpd < 16386) fpd = rand()*UINT32_MAX;
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Pop2::Pop2Kernel::Process
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void		Pop2::Pop2Kernel::Process(	const Float32 	*inSourceP,
                                                    Float32		 	*inDestP,
                                                    UInt32 			inFramesToProcess,
                                                    UInt32			inNumChannels, 
                                                    bool			&ioSilence )
{
	UInt32 nSampleFrames = inFramesToProcess;
	const Float32 *sourceP = inSourceP;
	Float32 *destP = inDestP;
	double overallscale = 1.0;
	overallscale /= 44100.0;
	overallscale *= GetSampleRate();
	
	int spacing = floor(overallscale); //should give us working basic scaling, usually 2 or 4
	if (spacing < 1) spacing = 1; if (spacing > 16) spacing = 16; //for ClipOnly2
	
	Float64 threshold = 1.0 - ((1.0-pow(1.0-GetParameter( kParam_One ),2))*0.9);
	Float64 attack = ((pow(GetParameter( kParam_Two ),4)*100000.0)+10.0)*overallscale;
	Float64 release = ((pow(GetParameter( kParam_Three ),5)*2000000.0)+20.0)*overallscale;
	Float64 maxRelease = release * 4.0;
	Float64 muPreGain = 1.0/threshold;
	Float64 muMakeupGain = sqrt(1.0 / threshold)*GetParameter( kParam_Four );
	Float64 wet = GetParameter( kParam_Five );
	//compressor section
	
	while (nSampleFrames-- > 0) {
		double inputSample = *sourceP;
		if (fabs(inputSample)<1.18e-23) inputSample = fpd * 1.18e-17;
		double drySample = inputSample;
		
		//begin compressor section
		inputSample *= muPreGain;
		if (flip) {
			if (fabs(inputSample) > threshold) {
				muVary = threshold / fabs(inputSample);
				muAttack = sqrt(fabs(muSpeedA));
				muCoefficientA = muCoefficientA * (muAttack-1.0);
				if (muVary < threshold) muCoefficientA = muCoefficientA + threshold;
				else  muCoefficientA = muCoefficientA + muVary;
				muCoefficientA = muCoefficientA / muAttack;
				muNewSpeed = muSpeedA * (muSpeedA-1.0);
				muNewSpeed = muNewSpeed + release;
				muSpeedA = muNewSpeed / muSpeedA;
				if (muSpeedA > maxRelease) muSpeedA = maxRelease;
			} else {
				muCoefficientA = muCoefficientA * ((muSpeedA * muSpeedA)-1.0);
				muCoefficientA = muCoefficientA + 1.0;
				muCoefficientA = muCoefficientA / (muSpeedA * muSpeedA);
				muNewSpeed = muSpeedA * (muSpeedA-1.0);
				muNewSpeed = muNewSpeed + attack;
				muSpeedA = muNewSpeed / muSpeedA;}
		} else {
			if (fabs(inputSample) > threshold) {
				muVary = threshold / fabs(inputSample);
				muAttack = sqrt(fabs(muSpeedB));
				muCoefficientB = muCoefficientB * (muAttack-1.0);
				if (muVary < threshold) muCoefficientB = muCoefficientB + threshold;
				else muCoefficientB = muCoefficientB + muVary;
				muCoefficientB = muCoefficientB / muAttack;
				muNewSpeed = muSpeedB * (muSpeedB-1.0);
				muNewSpeed = muNewSpeed + release;
				muSpeedB = muNewSpeed / muSpeedB;
				if (muSpeedB > maxRelease) muSpeedB = maxRelease;
			} else {
				muCoefficientB = muCoefficientB * ((muSpeedB * muSpeedB)-1.0);
				muCoefficientB = muCoefficientB + 1.0;
				muCoefficientB = muCoefficientB / (muSpeedB * muSpeedB);
				muNewSpeed = muSpeedB * (muSpeedB-1.0);
				muNewSpeed = muNewSpeed + attack;
				muSpeedB = muNewSpeed / muSpeedB;}
		}
		//got coefficients, adjusted speeds
		if (flip) inputSample *= pow(muCoefficientA,2);
		else inputSample *= pow(muCoefficientB,2);
		inputSample *= muMakeupGain;
		flip = !flip;
		//end compressor section
		
		//begin ClipOnly2 as a little, compressed chunk that can be dropped into code
		if (inputSample > 4.0) inputSample = 4.0; if (inputSample < -4.0) inputSample = -4.0;
		if (wasPosClip == true) { //current will be over
			if (inputSample<lastSample) lastSample=0.7058208+(inputSample*0.2609148);
			else lastSample = 0.2491717+(lastSample*0.7390851);
		} wasPosClip = false;
		if (inputSample>0.9549925859) {wasPosClip=true;inputSample=0.7058208+(lastSample*0.2609148);}
		if (wasNegClip == true) { //current will be -over
			if (inputSample > lastSample) lastSample=-0.7058208+(inputSample*0.2609148);
			else lastSample=-0.2491717+(lastSample*0.7390851);
		} wasNegClip = false;
		if (inputSample<-0.9549925859) {wasNegClip=true;inputSample=-0.7058208+(lastSample*0.2609148);}
		intermediate[spacing] = inputSample;
        inputSample = lastSample; //Latency is however many samples equals one 44.1k sample
		for (int x = spacing; x > 0; x--) intermediate[x-1] = intermediate[x];
		lastSample = intermediate[0]; //run a little buffer to handle this
		//end ClipOnly2 as a little, compressed chunk that can be dropped into code
		
		if (wet !=1.0) {
			inputSample = (inputSample * wet) + (drySample * (1.0-wet));
		}
		//Dry/Wet control, defaults to the last slider

		//begin 32 bit floating point dither
		int expon; frexpf((float)inputSample, &expon);
		fpd ^= fpd << 13; fpd ^= fpd >> 17; fpd ^= fpd << 5;
		inputSample += ((double(fpd)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2,expon+62));
		//end 32 bit floating point dither
		
		*destP = inputSample;
		
		sourceP += inNumChannels; destP += inNumChannels;
	}
}

