/*
  Copyright (c) 2021 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/AmplitudeEnvelope_tremolo.h"
#include "utilities/lookup3.h"
#include <math.h>

#define stemobject_implementation AmplitudeEnvelope_tremolo

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();

AmplitudeEnvelope_tremolo * AmplitudeEnvelope_tremolo_create(float baseAmplitude, float strength, float speed, float phase, float length) {
	stemobject_create_implementation(init, baseAmplitude, strength, speed, phase, length)
}

bool AmplitudeEnvelope_tremolo_init(AmplitudeEnvelope_tremolo * self, float baseAmplitude, float strength, float speed, float phase, float length) {
	call_super(init, self, baseAmplitude, length);
	self->strength = strength;
	self->speed    = speed;
	self->phase    = phase;
	return true;
}

void AmplitudeEnvelope_tremolo_dispose(AmplitudeEnvelope_tremolo * self) {
	call_super_virtual(dispose, self);
}

AmplitudeEnvelope_tremolo * AmplitudeEnvelope_tremolo_copy(AmplitudeEnvelope_tremolo * self) {
	stemobject_copy_implementation(initCopy)
}

bool AmplitudeEnvelope_tremolo_isEqual(AmplitudeEnvelope_tremolo * self, compat_type(AmplitudeEnvelope_tremolo *) compareUntyped) {
	AmplitudeEnvelope_tremolo * compare = compareUntyped;
	if (!call_super_virtual(isEqual, self, compare)) {
		return false;
	}
	return compare->strength == self->strength &&
	       compare->speed == self->speed &&
	       compare->phase == self->phase &&
	       compare->length == self->length;
}

uint32_t AmplitudeEnvelope_tremolo_hash(AmplitudeEnvelope_tremolo * self, uint32_t initval) {
	initval = hashlittle(&self->strength, sizeof(self->strength), initval);
	initval = hashlittle(&self->speed, sizeof(self->speed), initval);
	initval = hashlittle(&self->phase, sizeof(self->phase), initval);
	initval = hashlittle(&self->length, sizeof(self->length), initval);
	return initval;
}

void AmplitudeEnvelope_tremolo_initCopy(AmplitudeEnvelope_tremolo * self, AmplitudeEnvelope_tremolo * original) {
	call_super(initCopy, self, (AmplitudeEnvelope *) original);
	self->strength = original->strength;
	self->speed    = original->speed;
	self->phase    = original->phase;
	self->length   = original->length;
}

#define PROPERTY_INDEX_BASE_AMPLITUDE 0
#define PROPERTY_INDEX_STRENGTH 1
#define PROPERTY_INDEX_SPEED 2
#define PROPERTY_INDEX_PHASE 3

struct AmplitudeEnvelope_tremolo_state {
	float properties[4];
};

SamplerObject_state * AmplitudeEnvelope_tremolo_initState(AmplitudeEnvelope_tremolo * self) {
	struct AmplitudeEnvelope_tremolo_state * stateStruct = malloc(sizeof(*stateStruct));
	stateStruct->properties[PROPERTY_INDEX_BASE_AMPLITUDE] = self->baseAmplitude;
	stateStruct->properties[PROPERTY_INDEX_STRENGTH] = self->strength;
	stateStruct->properties[PROPERTY_INDEX_SPEED] = self->speed;
	stateStruct->properties[PROPERTY_INDEX_PHASE] = self->phase;
	return stateStruct;
}

void AmplitudeEnvelope_tremolo_disposeState(AmplitudeEnvelope_tremolo * self, SamplerObject_state * state) {
	free(state);
}

static SynthProperty synthProperties[4];

static void initSynthProperties(void) {
	SYNTH_PROPERTY(PROPERTY_INDEX_BASE_AMPLITUDE, baseAmplitude, "Amplitude",  0.0f, 1.0f, 0.5f, 0.05f)
	SYNTH_PROPERTY(PROPERTY_INDEX_STRENGTH,       strength,      "Strength",   0.0f, 1.0f, 0.0f, 0.05f)
	SYNTH_PROPERTY(PROPERTY_INDEX_SPEED,          speed,         "Speed",      0.0f, 50.0f, 4.0f, 1.0f)
	SYNTH_PROPERTY(PROPERTY_INDEX_PHASE,          phase,         "Phase",      0.0f, 1.0f, 0.0f, 0.05f)
}

SYNTH_PROPERTY_FUNCTION_IMPLEMENTATIONS()

float AmplitudeEnvelope_tremolo_getPropertyValueStateless(AmplitudeEnvelope_tremolo * self, SynthPropertyIdentifier propertyIdentifier) {
	switch (propertyIdentifier.propertyIndex) {
		case PROPERTY_INDEX_BASE_AMPLITUDE:
			return self->baseAmplitude;
		case PROPERTY_INDEX_STRENGTH:
			return self->strength;
		case PROPERTY_INDEX_SPEED:
			return self->speed;
		case PROPERTY_INDEX_PHASE:
			return self->phase;
	}
	return 0.0f;
}

void AmplitudeEnvelope_tremolo_setPropertyValue(AmplitudeEnvelope_tremolo * self, SamplerObject_state * state, SynthPropertyIdentifier propertyIdentifier, float value) {
	struct AmplitudeEnvelope_tremolo_state * stateStruct = state;
	stateStruct->properties[propertyIdentifier.propertyIndex] = value;
}

float AmplitudeEnvelope_tremolo_sample(AmplitudeEnvelope_tremolo * self, SamplerObject_state * state, float phase, float phaseDelta, float time, float timeDelta) {
	struct AmplitudeEnvelope_tremolo_state * stateStruct = state;
	float baseAmplitude = stateStruct->properties[PROPERTY_INDEX_BASE_AMPLITUDE];
	float strength = stateStruct->properties[PROPERTY_INDEX_STRENGTH];
	float tremoloSpeed = stateStruct->properties[PROPERTY_INDEX_SPEED];
	float tremoloPhase = stateStruct->properties[PROPERTY_INDEX_PHASE];
	return baseAmplitude + (sinf((time * tremoloSpeed + tremoloPhase) * M_PI * 2.0f) * strength + strength) * 0.5f;
}