#pragma once
#include <cstddef>
#include <complex>
#include <vector>

// FramedDetector — C++ port of framed_render.py (Phase 5 pilot, mean=0.175 dB).
// Per-frame per-bin mask:
//   res[f] = |2B(z)/A(z)|        (twin resonance, detkernel::twin)
//   am     = 2|X_k|/wsum         (per-bin input amplitude, smoothed attack/release)
//   xv     = log10(am / res)
//   C      = G_FIT*LUT(xv) + W_FIT*warp(f)^A_FIT
//   gain   = max(1-C, eps) * res^(rp0*Q^drp)
class FramedDetector {
public:
    FramedDetector(size_t nfft, float sample_rate);
    ~FramedDetector();

    // fc = band center freq, q = resonance Q (>=1). Precomputes res[] + warp[].
    void setParams(float fc, float q);

    // spectrum = forward FFT of one windowed frame (nfft/2+1 bins used).
    // mask output = per-bin complex gain (nfft entries, mirror applied).
    void processFrame(const std::complex<double>* spectrum, float* mask);

private:
    size_t nfft_;
    float sample_rate_;
    float fc_;
    float q_;
    double wsum_;

    std::vector<float> res_;      // per-bin |2B/A|
    std::vector<float> warp_;     // per-bin warp tilt
    std::vector<float> am_;       // smoothed per-bin amplitude state
    bool inited_;
};