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use crate::Scalar;
use lapacke::{Layout,
              sgeqrf, dgeqrf, cgeqrf, zgeqrf,
              sorgqr, dorgqr, cungqr, zungqr};
use num_complex::Complex32 as c32;
use num_complex::Complex64 as c64;

pub trait Tgeqrf: Scalar {
    unsafe fn geqrf(layout: Layout,
             m: i32,
             n: i32,
             a: &mut [Self],
             lda: i32,
             tau: &mut [Self]) -> i32;

    unsafe fn ungqr(layout: Layout,
             m: i32,
             n: i32,
             k: i32,
             a: &mut [Self],
             lda: i32,
             tau: &[Self]) -> i32;
}

macro_rules! impl_tgeqrf(
($N: ty, $tgeqrf: path, $torungqr: path) => (
        impl Tgeqrf for $N{
            #[inline]
            unsafe fn geqrf(
                layout: Layout,
                m: i32,
                n: i32,
                a: &mut [Self],
                lda: i32,
                tau: &mut [Self]) -> i32
            {
                    $tgeqrf(layout, m, n, a, lda, tau)
            }

            unsafe fn ungqr(
                layout: Layout,
                m: i32,
                n: i32,
                k: i32,
                a: &mut [Self],
                lda: i32,
                tau: &[Self]) -> i32
            {
                    $torungqr(layout, m, n, k, a, lda, tau)
            }
        }
    )
);

impl_tgeqrf!(f32, sgeqrf, sorgqr);
impl_tgeqrf!(f64, dgeqrf, dorgqr);
impl_tgeqrf!(c32, cgeqrf, cungqr);
impl_tgeqrf!(c64, zgeqrf, zungqr);