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#![allow(non_camel_case_types)]

pub use ffi::fftw_r2r_kind as R2R_KIND;
use std::ops::Neg;

#[repr(i32)]
#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
pub enum SIGN {
    FFTW_FORWARD = -1,
    FFTW_BACKWARD = 1,
}

impl Neg for SIGN {
    type Output = SIGN;
    fn neg(self) -> Self::Output {
        match self {
            SIGN::FFTW_FORWARD => SIGN::FFTW_BACKWARD,
            SIGN::FFTW_BACKWARD => SIGN::FFTW_FORWARD,
        }
    }
}

#[repr(u32)]
#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
pub enum FLAG {
    // documented flags
    FFTW_MEASURE = 0,
    FFTW_DESTROY_INPUT = 1 << 0,
    FFTW_UNALIGNED = 1 << 1,
    FFTW_CONSERVE_MEMORY = 1 << 2,
    FFTW_EXHAUSTIVE = 1 << 3, // NO_EXHAUSTIVE is default
    FFTW_PRESERVE_INPUT = 1 << 4, // cancels FFTW_DESTROY_INPUT
    FFTW_PATIENT = 1 << 5, // IMPATIENT is default
    FFTW_ESTIMATE = 1 << 6,
    FFTW_WISDOM_ONLY = 1 << 21,

    // undocumented beyond-guru flags
    FFTW_ESTIMATE_PATIENT = 1 << 7,
    FFTW_BELIEVE_PCOST = 1 << 8,
    FFTW_NO_DFT_R2HC = 1 << 9,
    FFTW_NO_NONTHREADED = 1 << 10,
    FFTW_NO_BUFFERING = 1 << 11,
    FFTW_NO_INDIRECT_OP = 1 << 12,
    FFTW_ALLOW_LARGE_GENERIC = 1 << 13, // NO_LARGE_GENERIC is default
    FFTW_NO_RANK_SPLITS = 1 << 14,
    FFTW_NO_VRANK_SPLITS = 1 << 15,
    FFTW_NO_VRECURSE = 1 << 16,
    FFTW_NO_SIMD = 1 << 17,
    FFTW_NO_SLOW = 1 << 18,
    FFTW_NO_FIXED_RADIX_LARGE_N = 1 << 19,
    FFTW_ALLOW_PRUNING = 1 << 20,
}