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use crate::matrix::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]
  }
}