/*
  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_layered.h"
#include "utilities/IOUtilities.h"
#include "utilities/lookup3.h"
#include <math.h>

#define stemobject_implementation AmplitudeEnvelope_layered

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(getLength);
stemobject_vtable_entry(getPropertyCount);
stemobject_vtable_entry(getPropertyAtIndex);
stemobject_vtable_entry(getPropertyValueStateless);
stemobject_vtable_entry(setPropertyValue);
stemobject_vtable_entry(sample);
stemobject_vtable_end();

AmplitudeEnvelope_layered * AmplitudeEnvelope_layered_create(float baseAmplitude, AmplitudeEnvelope_layered_blendMode blendMode, unsigned int layerCount, struct AmplitudeEnvelope_layered_layer * layers) {
	stemobject_create_implementation(init, baseAmplitude, blendMode, layerCount, layers)
}

bool AmplitudeEnvelope_layered_init(AmplitudeEnvelope_layered * self, float baseAmplitude, AmplitudeEnvelope_layered_blendMode blendMode, unsigned int layerCount, struct AmplitudeEnvelope_layered_layer * layers) {
	call_super(init, self, 1.0f, 1.0f);
	self->baseAmplitude = baseAmplitude;
	self->blendMode = blendMode;
	self->layerCount = layerCount;
	self->layers = memdup(layers, layerCount * sizeof(*layers));
	return true;
}

void AmplitudeEnvelope_layered_dispose(AmplitudeEnvelope_layered * self) {
	for (unsigned int layerIndex = 0; layerIndex < self->layerCount; layerIndex++) {
		call_virtual(dispose, self->layers[layerIndex].envelope);
	}
	free(self->layers);
	call_super_virtual(dispose, self);
}

AmplitudeEnvelope_layered * AmplitudeEnvelope_layered_copy(AmplitudeEnvelope_layered * self) {
	stemobject_copy_implementation(initCopy)
}

bool AmplitudeEnvelope_layered_isEqual(AmplitudeEnvelope_layered * self, compat_type(AmplitudeEnvelope_layered *) compareUntyped) {
	AmplitudeEnvelope_layered * compare = compareUntyped;
	if (!call_super_virtual(isEqual, self, compare)) {
		return false;
	}
	if (self->layerCount != compare->layerCount || self->blendMode != compare->blendMode) {
		return false;
	}
	for (unsigned int layerIndex = 0; layerIndex < self->layerCount; layerIndex++) {
		if (self->layers[layerIndex].blend != compare->layers[layerIndex].blend ||
		    self->layers[layerIndex].mute != compare->layers[layerIndex].mute ||
		    self->layers[layerIndex].solo != compare->layers[layerIndex].solo ||
		    !call_virtual(isEqual, self->layers[layerIndex].envelope, compare->layers[layerIndex].envelope)) {
			return false;
		}
	}
	return true;
}

uint32_t AmplitudeEnvelope_layered_hash(AmplitudeEnvelope_layered * self, uint32_t initval) {
	for (unsigned int layerIndex = 0; layerIndex < self->layerCount; layerIndex++) {
		initval = hashlittle(&self->layers[layerIndex].blend, sizeof(self->layers[layerIndex].blend), initval);
		uint32_t muteSoloSettings = self->layers[layerIndex].mute | (self->layers[layerIndex].solo << 1);
		initval = hashword(&muteSoloSettings, 1, initval);
		initval = call_virtual(hash, self->layers[layerIndex].envelope, initval);
	}
	return initval;
}

void AmplitudeEnvelope_layered_initCopy(AmplitudeEnvelope_layered * self, AmplitudeEnvelope_layered * original) {
	call_super(initCopy, self, (AmplitudeEnvelope *) original);
	self->blendMode = original->blendMode;
	self->layerCount = original->layerCount;
	self->layers = memdup(original->layers, original->layerCount * sizeof(*original->layers));
	for (unsigned int layerIndex = 0; layerIndex < self->layerCount; layerIndex++) {
		self->layers[layerIndex].envelope = call_virtual(copy, original->layers[layerIndex].envelope);
	}
}

struct AmplitudeEnvelope_layered_state {
	float baseAmplitude;
	struct {
		float blend;
		SamplerObject_state * state;
	} * layerStates;
};

SamplerObject_state * AmplitudeEnvelope_layered_initState(AmplitudeEnvelope_layered * self) {
	struct AmplitudeEnvelope_layered_state * stateStruct = malloc(sizeof(*stateStruct) + sizeof(*stateStruct->layerStates) * self->layerCount);
	stateStruct->layerStates = (void *) (stateStruct + 1);
	stateStruct->baseAmplitude = self->baseAmplitude;
	for (unsigned int layerIndex = 0; layerIndex < self->layerCount; layerIndex++) {
		stateStruct->layerStates[layerIndex].blend = self->layers[layerIndex].blend;
		stateStruct->layerStates[layerIndex].state = call_virtual(initState, self->layers[layerIndex].envelope);
	}
	return stateStruct;
}

void AmplitudeEnvelope_layered_disposeState(AmplitudeEnvelope_layered * self, SamplerObject_state * state) {
	struct AmplitudeEnvelope_layered_state * stateStruct = state;
	for (unsigned int layerIndex = 0; layerIndex < self->layerCount; layerIndex++) {
		call_virtual(disposeState, self->layers[layerIndex].envelope, stateStruct->layerStates[layerIndex].state);
	}
	free(stateStruct);
}

float AmplitudeEnvelope_layered_getLength(AmplitudeEnvelope_layered * self) {
	float length = call_virtual(getLength, self->layers[0].envelope);
	for (unsigned int layerIndex = 1; layerIndex < self->layerCount; layerIndex++) {
		length = fmax(length, call_virtual(getLength, self->layers[layerIndex].envelope));
	}
	return length;
}

unsigned int AmplitudeEnvelope_layered_getPropertyCount(AmplitudeEnvelope_layered * self) {
	unsigned int propertyCount = 1;
	for (unsigned int layerIndex = 0; layerIndex < self->layerCount; layerIndex++) {
		propertyCount += 1 + call_virtual(getPropertyCount, self->layers[layerIndex].envelope);
	}
	return propertyCount;
}

SynthProperty AmplitudeEnvelope_layered_getPropertyAtIndex(AmplitudeEnvelope_layered * self, unsigned int index) {
	if (index == 0) {
		return (SynthProperty) {.propertyIndex = 0, .description = "Base amplitude", .minValue = 0.0f, .maxValue = 2.0f, .defaultValue = 1.0f, .stepIncrement = 0.1f};
	}
	unsigned int layerPropertyIndex = index - 1;
	for (unsigned int layerIndex = 0; layerIndex < self->layerCount; layerIndex++) {
		unsigned int propertyCount = call_virtual(getPropertyCount, self->layers[layerIndex].envelope);
		if (layerPropertyIndex < propertyCount + 1) {
			if (layerPropertyIndex == 0) {
				SynthProperty property;
				property.propertyIndex = index;
				snprintf_safe(property.description, sizeof(property.description), "Layer %u blend", layerIndex + 1);
				property.minValue = 0.0f;
				property.maxValue = 1.0f;
				property.defaultValue = 1.0f;
				property.stepIncrement = 0.05f;
				return property;
			}
			SynthProperty property = call_virtual(getPropertyAtIndex, self->layers[layerIndex].envelope, layerPropertyIndex - 1);
			char description[40];
			strncpy_safe(description, property.description, sizeof(description));
			snprintf_safe(property.description, sizeof(property.description), "Layer %u: %s", layerIndex + 1, description);
			property.propertyIndex = index;
			return property;
		}
		layerPropertyIndex -= propertyCount + 1;
	}
	return SynthProperty_undefined;
}

float AmplitudeEnvelope_layered_getPropertyValueStateless(AmplitudeEnvelope_layered * self, SynthPropertyIdentifier propertyIdentifier) {
	if (propertyIdentifier.propertyIndex == 0) {
		return self->baseAmplitude;
	}
	propertyIdentifier.propertyIndex--;
	for (unsigned int layerIndex = 0; layerIndex < self->layerCount; layerIndex++) {
		unsigned int propertyCount = call_virtual(getPropertyCount, self->layers[layerIndex].envelope);
		if (propertyIdentifier.propertyIndex < propertyCount + 1) {
			if (propertyIdentifier.propertyIndex == 0) {
				return self->layers[layerIndex].blend;
			}
			propertyIdentifier.propertyIndex--;
			return call_virtual(getPropertyValueStateless, self->layers[layerIndex].envelope, propertyIdentifier);
		}
		propertyIdentifier.propertyIndex -= propertyCount + 1;
	}
	return 0.0f;
}

void AmplitudeEnvelope_layered_setPropertyValue(AmplitudeEnvelope_layered * self, SamplerObject_state * state, SynthPropertyIdentifier propertyIdentifier, float value) {
	struct AmplitudeEnvelope_layered_state * stateStruct = state;
	for (unsigned int layerIndex = 0; layerIndex < self->layerCount; layerIndex++) {
		unsigned int propertyCount = call_virtual(getPropertyCount, self->layers[layerIndex].envelope);
		if (propertyIdentifier.propertyIndex < propertyCount + 1) {
			if (propertyIdentifier.propertyIndex == 0) {
				stateStruct->layerStates[layerIndex].blend = value;
			} else {
				propertyIdentifier.propertyIndex -= 1;
				call_virtual(setPropertyValue, self->layers[layerIndex].envelope, stateStruct->layerStates[layerIndex].state, propertyIdentifier, value);
			}
			break;
		}
		propertyIdentifier.propertyIndex -= propertyCount + 1;
	}
}

float AmplitudeEnvelope_layered_sample(AmplitudeEnvelope_layered * self, SamplerObject_state * state, float phase, float phaseDelta, float time, float timeDelta) {
	struct AmplitudeEnvelope_layered_state * stateStruct = state;
	for (unsigned int layerIndex = 0; layerIndex < self->layerCount; layerIndex++) {
		if (self->layers[layerIndex].solo) {
			return call_virtual(sample, self->layers[layerIndex].envelope, stateStruct->layerStates[layerIndex].state, phase, phaseDelta, time, timeDelta) * self->layers[layerIndex].blend;
		}
	}
	float blendTotal = stateStruct->layerStates[0].blend * !self->layers[0].mute;
	float sample = call_virtual(sample, self->layers[0].envelope, stateStruct->layerStates[0].state, phase, phaseDelta, time, timeDelta) * blendTotal;
	float lastSampleBlend = blendTotal;
	for (unsigned int layerIndex = 1; layerIndex < self->layerCount; layerIndex++) {
		if (self->layers[layerIndex].mute) {
			continue;
		}
		float layerBlend = stateStruct->layerStates[layerIndex].blend;
		float layerSample = call_virtual(sample, self->layers[layerIndex].envelope, stateStruct->layerStates[layerIndex].state, phase, phaseDelta, time, timeDelta);
		switch (self->blendMode) {
			case AmplitudeEnvelope_layered_average:
			case AmplitudeEnvelope_layered_add:
				sample += layerSample * layerBlend;
				break;
			case AmplitudeEnvelope_layered_multiply:
				sample = sample * (1.0f - layerBlend) + sample * layerSample * layerBlend + layerSample * layerBlend * (1.0f - lastSampleBlend);
				break;
			case AmplitudeEnvelope_layered_min:
				sample = sample * (1.0f - layerBlend) + fminf(sample, layerSample) * layerBlend * lastSampleBlend + layerSample * layerBlend * (1.0f - lastSampleBlend);
				break;
			case AmplitudeEnvelope_layered_max:
				sample = sample * (1.0f - layerBlend) + fmaxf(sample, layerSample) * layerBlend * lastSampleBlend + layerSample * layerBlend * (1.0f - lastSampleBlend);
				break;
		}
		// This is iffy; not 100% sure fmax is the correct operator here
		lastSampleBlend = fmaxf(lastSampleBlend, layerBlend);
		blendTotal += layerBlend;
	}
	if (self->blendMode == AmplitudeEnvelope_layered_average && blendTotal != 0.0f) {
		sample /= blendTotal;
	}
	return sample * stateStruct->baseAmplitude;
}

void AmplitudeEnvelope_layered_addLayer(AmplitudeEnvelope_layered * self, struct AmplitudeEnvelope_layered_layer layer) {
	self->layers = realloc(self->layers, (self->layerCount + 1) * sizeof(*self->layers));
	self->layers[self->layerCount++] = layer;
}

void AmplitudeEnvelope_layered_removeLayer(AmplitudeEnvelope_layered * self, unsigned int layerIndex) {
	if (layerIndex < self->layerCount) {
		call_virtual(dispose, self->layers[layerIndex].envelope);
		self->layerCount--;
		for (; layerIndex < self->layerCount; layerIndex++) {
			self->layers[layerIndex] = self->layers[layerIndex + 1];
		}
	}
}