#pragma once

#include <JuceHeader.h>
#include "Params.h"

namespace serum
{

// ===========================================================================
// Base class for a stereo effect unit. Each unit processes a full-wet buffer.
// ===========================================================================
class FXUnit
{
public:
    virtual ~FXUnit() = default;
    virtual void prepare (double sampleRate, int maxBlockSize) = 0;
    virtual void reset() = 0;
    virtual void process (float* l, float* r, int numSamples, const float p[4]) = 0;
};

// ===========================================================================
// Snapshot of one FX slot.
// ===========================================================================
struct FxSlotParams
{
    int   type = (int) FxType::Off;
    float mix  = 0.0f;
    float p[4] = { 0.0f, 0.0f, 0.0f, 0.0f };
};

// ===========================================================================
// Reorderable effects rack. Slots are processed in list order; reordering is
// simply swapping FxSlotParams entries. Nine effect unit implementations are
// preconstructed per slot with independent DSP history.
// ===========================================================================
class FXProcessor
{
public:
    FXProcessor();
    ~FXProcessor();

    void prepare (double sampleRate, int maxBlockSize);
    void reset();

    void process (juce::AudioBuffer<float>& buffer, const FxSlotParams* slots, int numSlots);

    static juce::String fxTypeName (int type);

private:
    static constexpr int kNumEffectTypes = (int) FxType::Count - 1;
    std::array<std::array<std::unique_ptr<FXUnit>, kNumEffectTypes>, kNumFxSlots> units;
    std::array<int, kNumFxSlots> activeTypes {};
    juce::AudioBuffer<float> wet;
};

} // namespace serum