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

    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>(0, MAX_FEEDBACK);

	this->delayLength = 0.0f;
	this->feedback = 0.75f;
	this->delayBufferLength = 1;

	this->delayReadPosition = 0;
	this->delayWritePosition = 0;
}

CMLSDelay::~CMLSDelay() {}

void CMLSDelay::reset() {
}

void CMLSDelay::prepare(const juce::dsp::ProcessSpec& spec) {
	this->delayBufferLength = (int) 2.0 * spec.sampleRate;
	
	if (this->delayBufferLength < 1) {
		this->delayBufferLength = 1;
	}

	this->delayBuffer.setSize(spec.numChannels, this->delayBufferLength);
	this->delayBuffer.clear();

	this->delayReadPosition = (int)(this->delayWritePosition - (this->delayLength * spec.sampleRate) + this->delayBufferLength) % this->delayBufferLength;
}

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

	int dpr, dpw;

	for (int channel = 0; channel < numChannels; ++channel) {
		float* channelData = audioBlock.getChannelPointer(channel);
		float* delayData = this->delayBuffer.getWritePointer(juce::jmin(channel, this->delayBuffer.getNumChannels() - 1));

		dpr = this->delayReadPosition;
		dpw = this->delayWritePosition;

		for (int sample = 0; sample < numSamples; sample++) {
			const float in = channelData[sample];
			float out = 0.0f;

			out = ((1-this->dryWetProp) * in + this->dryWetProp * delayData[dpr]);
			delayData[dpw] = in + (this->feedback * delayData[dpr]);

			if (++dpr >= this->delayBufferLength) {
				dpr = 0;
			}
			if (++dpw >= this->delayBufferLength) {
				dpw = 0;
			}

			channelData[sample] = out;
		}
	}

	this->delayReadPosition = dpr;
	this->delayWritePosition = dpw;
}

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

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

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

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