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use crate::{matrix::Matrix, number::Number};

pub trait SubMatrix<T>: Send + Sync {
    fn size(&self) -> (usize, usize);
    fn index(&self, i: usize, j: usize) -> T;
}

impl<T> SubMatrix<T> for T
where
    T: Number,
{
    fn size(&self) -> (usize, usize) {
        (1usize, 1usize)
    }

    fn index(&self, _: usize, _: usize) -> T {
        *self
    }
}

impl<T> SubMatrix<T> for Matrix<T>
where
    T: Number,
{
    fn size(&self) -> (usize, usize) {
        (self.get_rows(), self.get_columns())
    }

    fn index(&self, i: usize, j: usize) -> T {
        self[i][j]
    }
}

impl<T> SubMatrix<T> for &Matrix<T>
where
    T: Number,
{
    fn size(&self) -> (usize, usize) {
        (self.get_rows(), self.get_columns())
    }

    fn index(&self, i: usize, j: usize) -> T {
        self[i][j]
    }
}