/*
==============================================================================
    PluginProcessor.h

    Audio processor for CrystalizerEQ plugin
    Manages DSP processing chain, filter coefficients, multiband processing,
    and parameter state (APVTS)
  ==============================================================================
*/

#pragma once

#include <juce_audio_processors/juce_audio_processors.h>
#include <juce_audio_utils/juce_audio_utils.h>
#include <juce_dsp/juce_dsp.h>


class AudioFIFO {
public:
    AudioFIFO();

    ~AudioFIFO();

    juce::Array<float> sampleStack;

    void loadSamplesToFIFO(const juce::AudioBuffer<float> &samples);

    juce::Array<float> sendSamplesToEditor();

    juce::SpinLock lock;

};

class CrystalizerEQAudioProcessor : public juce::AudioProcessor, public juce::AudioProcessorValueTreeState::Listener {
public:
    //==============================================================================
    CrystalizerEQAudioProcessor();

    ~CrystalizerEQAudioProcessor() override;

    void parameterChanged(const juce::String &id, float newValue) override;


    //==============================================================================
    void prepareToPlay(double sampleRate, int samplesPerBlock) override;

    void releaseResources() override;

#ifndef JucePlugin_PreferredChannelConfigurations
    bool isBusesLayoutSupported(const BusesLayout &layouts) const override;
#endif

    void processBlock(juce::AudioBuffer<float> &, juce::MidiBuffer &) override;

    //==============================================================================
    juce::AudioProcessorEditor *createEditor() override;

    bool hasEditor() const override;

    //==============================================================================
    const juce::String getName() const override;

    bool acceptsMidi() const override;

    bool producesMidi() const override;

    bool isMidiEffect() const override;

    double getTailLengthSeconds() const override;

    //==============================================================================
    int getNumPrograms() override;

    int getCurrentProgram() override;

    void setCurrentProgram(int index) override;

    const juce::String getProgramName(int index) override;

    void changeProgramName(int index, const juce::String &newName) override;


    //==============================================================================
    void getStateInformation(juce::MemoryBlock &destData) override;

    void setStateInformation(const void *data, int sizeInBytes) override;

    // --------- Parameter (APVTS) ----------
    static juce::AudioProcessorValueTreeState::ParameterLayout createParameterLayout();

    juce::AudioProcessorValueTreeState apvts{*this, nullptr, "PARAMS", createParameterLayout()};

    void setPresetName(const juce::String &s);

    juce::String getPresetName() const noexcept { return presetName; }

    juce::StringArray getPresetNamesArray() const;

    juce::String savePresetToFile() const;

    void loadPreset(const juce::String &preset);

    void deletePreset(const juce::String &preset) const;

    void resetAllParameters();

    bool lowCutActive = false;
    bool highCutActive = false;

    AudioFIFO audioFIFO;

private:
    using Gain = juce::dsp::Gain<float>;
    using Filter = juce::dsp::IIR::Filter<float>;
    using Chain = juce::dsp::ProcessorChain<Gain, Filter, Filter, Filter, Filter, Filter, Filter, Filter, Filter, Filter
        , Filter, Filter, Filter, Filter, Gain>; // 0: LowCut (HP), 1: Peak, 2: HighCut (LP)
    juce::Random noiseRandL, noiseRandR;
    Chain leftChain, rightChain;


    void updateFilters();


    juce::AudioBuffer<float> processMultiBand(juce::AudioBuffer<float> &lowBuf, juce::AudioBuffer<float> &highBuf);


    using Coeff = juce::dsp::IIR::Coefficients<float>;


    juce::dsp::IIR::Filter<float> mbHighPeakL;
    juce::dsp::IIR::Filter<float> mbHighPeakR;

    juce::dsp::LinkwitzRileyFilter<float> mbLowpassL, mbLowpassR;
    juce::dsp::LinkwitzRileyFilter<float> mbHighpassL, mbHighpassR;
    juce::dsp::WaveShaper<float> saturatorL, saturatorR;


    juce::String presetName{"Init"};

    //==============================================================================
    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(CrystalizerEQAudioProcessor)
};