/*
  Copyright (c) 2023 Alex Diener
  
  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.
  
  Alex Diener alex@ludobloom.com
*/

#include "audiosynth/WaveModifier_ringModulation.h"
#include "utilities/lookup3.h"
#include <math.h>

#define stemobject_implementation WaveModifier_ringModulation

stemobject_vtable_begin();
stemobject_vtable_entry(dispose);
stemobject_vtable_entry(copy);
stemobject_vtable_entry(isEqual);
stemobject_vtable_entry(hash);
stemobject_vtable_entry(initState);
stemobject_vtable_entry(disposeState);
stemobject_vtable_entry(getPropertyCount);
stemobject_vtable_entry(getPropertyAtIndex);
stemobject_vtable_entry(getPropertyValueStateless);
stemobject_vtable_entry(setPropertyValue);
stemobject_vtable_entry(sample);
stemobject_vtable_end();

WaveModifier_ringModulation * WaveModifier_ringModulation_create(compat_type(WaveSampler *) carrier, float carrierFrequency, float carrierPhaseOffset) {
	stemobject_create_implementation(init, carrier, carrierFrequency, carrierPhaseOffset)
}

bool WaveModifier_ringModulation_init(WaveModifier_ringModulation * self, compat_type(WaveSampler *) carrier, float carrierFrequency, float carrierPhaseOffset) {
	call_super(init, self);
	self->carrier = carrier;
	self->carrierFrequency = carrierFrequency;
	self->carrierPhaseOffset = carrierPhaseOffset;
	return true;
}

void WaveModifier_ringModulation_dispose(WaveModifier_ringModulation * self) {
	call_virtual(dispose, self->carrier);
	call_super_virtual(dispose, self);
}

WaveModifier_ringModulation * WaveModifier_ringModulation_copy(WaveModifier_ringModulation * self) {
	stemobject_copy_implementation(initCopy)
}

bool WaveModifier_ringModulation_isEqual(WaveModifier_ringModulation * self, compat_type(WaveModifier_ringModulation *) compareUntyped) {
	WaveModifier_ringModulation * compare = compareUntyped;
	if (!call_super_virtual(isEqual, self, compare)) {
		return false;
	}
	return self->carrierFrequency == compare->carrierFrequency &&
	       self->carrierPhaseOffset == compare->carrierPhaseOffset &&
	       call_virtual(isEqual, self->carrier, compare->carrier);
}

uint32_t WaveModifier_ringModulation_hash(WaveModifier_ringModulation * self, uint32_t initval) {
	initval = hashlittle(&self->carrierFrequency, sizeof(self->carrierFrequency), initval);
	initval = hashlittle(&self->carrierPhaseOffset, sizeof(self->carrierPhaseOffset), initval);
	initval = call_virtual(hash, self->carrier, initval);
	return initval;
}

void WaveModifier_ringModulation_initCopy(WaveModifier_ringModulation * self, WaveModifier_ringModulation * original) {
	call_super(initCopy, self, (WaveModifier *) original);
	self->carrier = call_virtual(copy, original->carrier);
	self->carrierFrequency = original->carrierFrequency;
	self->carrierPhaseOffset = original->carrierPhaseOffset;
}

#define PROPERTY_INDEX_BLEND 0
#define PROPERTY_INDEX_CARRIER_FREQUENCY 1
#define PROPERTY_COUNT 2

struct WaveModifier_ringModulation_state {
	SamplerObject_state * upstreamState;
	SamplerObject_state * carrierState;
	double carrierPhase;
	double lastCarrierPhase;
	float properties[PROPERTY_COUNT];
};

SamplerObject_state * WaveModifier_ringModulation_initState(WaveModifier_ringModulation * self) {
	struct WaveModifier_ringModulation_state * stateStruct = malloc(sizeof(*stateStruct));
	stateStruct->upstreamState = call_virtual(initState, self->upstream);
	stateStruct->carrierState = call_virtual(initState, self->carrier);
	stateStruct->properties[PROPERTY_INDEX_BLEND] = self->blend;
	stateStruct->properties[PROPERTY_INDEX_CARRIER_FREQUENCY] = self->carrierFrequency;
	stateStruct->carrierPhase = self->carrierPhaseOffset;
	stateStruct->lastCarrierPhase = self->carrierPhaseOffset;
	return stateStruct;
}

void WaveModifier_ringModulation_disposeState(WaveModifier_ringModulation * self, SamplerObject_state * state) {
	struct WaveModifier_ringModulation_state * stateStruct = state;
	call_virtual(disposeState, self->upstream, stateStruct->upstreamState);
	call_virtual(disposeState, self->carrier, stateStruct->carrierState);
	free(stateStruct);
}

unsigned int WaveModifier_ringModulation_getPropertyCount(WaveModifier_ringModulation * self) {
	return PROPERTY_COUNT + call_virtual(getPropertyCount, self->carrier) + call_virtual(getPropertyCount, self->upstream);
}

SynthProperty WaveModifier_ringModulation_getPropertyAtIndex(WaveModifier_ringModulation * self, unsigned int index) {
	if (index == PROPERTY_INDEX_BLEND) {
		return (SynthProperty) {.propertyIndex = 0, .description = "Blend (ring modulation)", .offset = offsetof(WaveModifier_ringModulation, blend),            .minValue = 0.0f, .maxValue = 1.0f, .defaultValue = 1.0f, .stepIncrement = 0.05f};
	}
	if (index == PROPERTY_INDEX_CARRIER_FREQUENCY) {
		return (SynthProperty) {.propertyIndex = 1, .description = "Carrier frequency",       .offset = offsetof(WaveModifier_ringModulation, carrierFrequency), .minValue = 0.0f, .maxValue = 9.0f, .defaultValue = 4.0f, .stepIncrement = 1.0f / 12.0f};
	}
	unsigned int carrierPropertyCount = call_virtual(getPropertyCount, self->carrier);
	if (index - PROPERTY_COUNT < carrierPropertyCount) {
		SynthProperty carrierProperty = call_virtual(getPropertyAtIndex, self->carrier, index - PROPERTY_COUNT);
		carrierProperty.propertyIndex = index;
		return carrierProperty;
	}
	SynthProperty upstreamProperty = call_virtual(getPropertyAtIndex, self->upstream, index - PROPERTY_COUNT - carrierPropertyCount);
	upstreamProperty.propertyIndex = index;
	return upstreamProperty;
}

float WaveModifier_ringModulation_getPropertyValueStateless(WaveModifier_ringModulation * self, SynthPropertyIdentifier propertyIdentifier) {
	if (propertyIdentifier.propertyIndex == PROPERTY_INDEX_BLEND) {
		return self->blend;
	}
	if (propertyIdentifier.propertyIndex == PROPERTY_INDEX_CARRIER_FREQUENCY) {
		return self->carrierFrequency;
	}
	propertyIdentifier.propertyIndex -= PROPERTY_COUNT;
	unsigned int carrierPropertyCount = call_virtual(getPropertyCount, self->carrier);
	if (propertyIdentifier.propertyIndex < carrierPropertyCount) {
		return call_virtual(getPropertyValueStateless, self->carrier, propertyIdentifier);
	}
	propertyIdentifier.propertyIndex -= carrierPropertyCount;
	return call_virtual(getPropertyValueStateless, self->upstream, propertyIdentifier);
}

void WaveModifier_ringModulation_setPropertyValue(WaveModifier_ringModulation * self, SamplerObject_state * state, SynthPropertyIdentifier propertyIdentifier, float value) {
	struct WaveModifier_ringModulation_state * stateStruct = state;
	if (propertyIdentifier.propertyIndex < PROPERTY_COUNT) {
		stateStruct->properties[propertyIdentifier.propertyIndex] = value;
	} else {
		propertyIdentifier.propertyIndex -= PROPERTY_COUNT;
		unsigned int carrierPropertyCount = call_virtual(getPropertyCount, self->carrier);
		if (propertyIdentifier.propertyIndex < carrierPropertyCount) {
			call_virtual(setPropertyValue, self->carrier, stateStruct->carrierState, propertyIdentifier, value);
		} else {
			propertyIdentifier.propertyIndex -= carrierPropertyCount;
			call_virtual(setPropertyValue, self->upstream, stateStruct->upstreamState, propertyIdentifier, value);
		}
	}
}

float WaveModifier_ringModulation_sample(WaveModifier_ringModulation * self, SamplerObject_state * state, float phase, float phaseDelta, float time, float timeDelta) {
	struct WaveModifier_ringModulation_state * stateStruct = state;
	float blend = stateStruct->properties[PROPERTY_INDEX_BLEND];
	float carrierFrequency = stateStruct->properties[PROPERTY_INDEX_CARRIER_FREQUENCY];
	float sample = call_virtual(sample, self->upstream, stateStruct->upstreamState, phase, phaseDelta, time, timeDelta);
	
	double carrierPhase = stateStruct->carrierPhase;
	float carrierSample = call_virtual(sample, self->carrier, stateStruct->carrierState, carrierPhase, carrierPhase - stateStruct->lastCarrierPhase, time, timeDelta);
	stateStruct->lastCarrierPhase = carrierPhase;
	carrierPhase += 13.75 * pow(2.0, carrierFrequency) * timeDelta;
	stateStruct->carrierPhase = carrierPhase;
	
	float modifiedSample = sample * carrierSample;
	return modifiedSample * blend + sample * (1.0f - blend);
}