/*
  ==============================================================================

    CMLSDelay.cpp
    Created: 3 May 2025 5:39:35pm
    Author:  Luigi

  ==============================================================================
*/

#include "CMLSDelay.h"

CMLSDelay::CMLSDelay() {
	delayLengthRange = new juce::NormalisableRange<float>(0, MAX_DELAY_LENGTH);
	feedbackRange = new juce::NormalisableRange<float>(MIN_FEEDBACK, MAX_FEEDBACK);

	this->delayLength = 0.0f;
	this->feedback = 0.0f;
	this->amount = 0.0f;
	this->dryWetProp = 0.0f;
}

CMLSDelay::~CMLSDelay() {}

void CMLSDelay::reset() {
}

void CMLSDelay::prepare(const juce::dsp::ProcessSpec& spec) {
	this->effectDelaySamples = spec.sampleRate * MAX_DELAY_LENGTH;
	this->delayLine.setMaximumDelayInSamples(this->effectDelaySamples);
	this->linearDelay.setMaximumDelayInSamples(this->effectDelaySamples);

	this->delayLine.prepare(spec);
	this->linearDelay.prepare(spec);
	this->mixer.prepare(spec);

	for (auto& volume : this->delayFeedbackVolume) {
		volume.reset(spec.sampleRate, 0.05f);
	}

	this->mixer.reset();
	this->mixer.setMixingRule(juce::dsp::DryWetMixingRule::linear);

	std::fill(this->delayValue.begin(), this->delayValue.end(), 0.0f);
	std::fill(this->lastDelayOutput.begin(), this->lastDelayOutput.end(), 0.0f);
}

void CMLSDelay::process(const juce::dsp::ProcessContextReplacing<float>& context) {
	auto audioBlock = context.getOutputBlock();
	auto numChannels = audioBlock.getNumChannels();
	const auto numSamples = audioBlock.getNumSamples();

	const auto& input = context.getInputBlock();
	const auto& output = context.getOutputBlock();

	this->mixer.pushDrySamples(input);

	for (size_t channel = 0; channel < numChannels; ++channel) {
		auto* samplesIn = input.getChannelPointer(channel);
		auto* samplesOut = output.getChannelPointer(channel);

		for (size_t sample = 0; sample < input.getNumSamples(); ++sample) {
			auto input = samplesIn[sample] - this->lastDelayOutput[channel];
			auto delayAmount = this->delayValue[channel];

			this->linearDelay.pushSample(channel, input);
			this->linearDelay.setDelay(delayAmount);
			samplesOut[sample] = this->linearDelay.popSample(channel);

			this->lastDelayOutput[channel] = samplesOut[sample] * this->delayFeedbackVolume[channel].getNextValue();
		}
	}

	this->mixer.mixWetSamples(output);
}

void CMLSDelay::setDryWet(float value) {
	this->dryWetProp = value;
	this->mixer.setWetMixProportion(this->dryWetProp);
}

void CMLSDelay::setAmount(float value) {
	this->delayLength = this->delayLengthRange->convertFrom0to1(value);
	this->feedback = this->delayLengthRange->convertFrom0to1(value);

	std::fill(this->delayValue.begin(), this->delayValue.end(), this->delayLength * this->effectDelaySamples);
	for (auto& volume : this->delayFeedbackVolume) {
		volume.setTargetValue(this->feedback);
	}
}

const float CMLSDelay::getDryWet() {
	return this->dryWetProp;
}

const float CMLSDelay::getAmount() {
	return this->amount;
}