#pragma once
#include <cstddef>
#include <cstdint>
#include <complex>
#include "fft_plan.hpp"

namespace fft {

void init_plan(FFTPlan* plan, uint32_t log2N);
void build_twiddle(FFTPlan* plan, double* scratch);
void execute(const FFTPlan* plan, std::complex<double>* buf);
void execute_inverse(const FFTPlan* plan, std::complex<double>* buf);

// Real RFFT: N real → N/2+1 complex (forward)
// N/2+1 complex → N real (inverse)
void execute_real_forward(const FFTPlan* plan, double* real_in, std::complex<double>* complex_out);
void execute_real_inverse(const FFTPlan* plan, std::complex<double>* complex_in, double* real_out);

}