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use crate::matrix::ge::Matrix;
use crate::number::Number;
use std::ops::{Index, IndexMut};

impl<T> Index<usize> for Matrix<T>
where
    T: Number,
{
    type Output = [T];
    fn index(&self, index: usize) -> &Self::Output {
        let i = self.rows * index;
        &self.elems[i..i + self.rows]
    }
}

impl<T> IndexMut<usize> for Matrix<T>
where
    T: Number,
{
    fn index_mut(&mut self, index: usize) -> &mut Self::Output {
        let i = self.rows * index;
        &mut self.elems[i..i + self.rows]
    }
}

impl<T> Index<(usize, usize)> for Matrix<T>
where
    T: Number,
{
    type Output = T;
    fn index(&self, index: (usize, usize)) -> &Self::Output {
        &self.elems[index.0 + index.1 * self.rows]
    }
}

impl<T> IndexMut<(usize, usize)> for Matrix<T>
where
    T: Number,
{
    fn index_mut(&mut self, index: (usize, usize)) -> &mut Self::Output {
        &mut self.elems[index.0 + index.1 * self.rows]
    }
}

mod tests {
    #[allow(unused_imports)]
    use crate::*;
    #[test]
    fn it_works() {
        let a = mat!(
            1.0, 2.0;
            3.0, 4.0
        );
        assert_eq!(a[0], [1.0, 3.0]);
        assert_eq!(a[1], [2.0, 4.0]);
    }

    #[test]
    fn it_works2() {
        let a = mat!(
            1.0, 2.0;
            3.0, 4.0
        );
        assert_eq!(a[(0, 0)], 1.0);
        assert_eq!(a[(0, 1)], 2.0);
        assert_eq!(a[(1, 0)], 3.0);
        assert_eq!(a[(1, 1)], 4.0);
    }
}