#include <cmath>
#include <complex>

#include <array>
#include <vector>

class pickup_cancel {
public:
	pickup_cancel(float fst_f, float eps);
	float do_sample(float x_input);

	bool is_in_sync();

	float act_f;
	float act_phi;

	const float max_f;
	const float min_f;

	/* PLL filter time constant */
	const float decay_cst;
	float error_filter = 0.0f;

	float cos_power = 0.0f;
	float sin_power = 0.0f;

	float mu = 1e-1f;
	// One revolution is 2048 samples
	std::array<float, 2048> pickup_timedomain;

	// Length 1024 boxcar filter (fst 0 ~at +48Hz !)
	float nom_f;
	float lock_phi;
	float pd_delayed;
	std::vector<std::complex<float>> lockin_filter;
	unsigned int filter_index = 0; 
	std::complex<float> filter_sum;
};