use backend::hal::{
    api::{VecZnxCopy, VecZnxFillUniform, ZnxInfos},
    layouts::{Backend, Module},
};

pub trait Infos {
    type Inner: ZnxInfos;

    fn inner(&self) -> &Self::Inner;

    /// Returns the ring degree of the polynomials.
    fn n(&self) -> usize {
        self.inner().n()
    }

    /// Returns the base two logarithm of the ring dimension of the polynomials.
    fn log_n(&self) -> usize {
        self.inner().log_n()
    }

    /// Returns the number of rows.
    fn rows(&self) -> usize {
        self.inner().rows()
    }

    /// Returns the number of polynomials in each row.
    fn cols(&self) -> usize {
        self.inner().cols()
    }

    fn rank(&self) -> usize {
        self.cols() - 1
    }

    /// Returns the number of size per polynomial.
    fn size(&self) -> usize {
        let size: usize = self.inner().size();
        debug_assert!(size >= self.k().div_ceil(self.basek()));
        size
    }

    /// Returns the total number of small polynomials.
    fn poly_count(&self) -> usize {
        self.rows() * self.cols() * self.size()
    }

    /// Returns the base 2 logarithm of the ciphertext base.
    fn basek(&self) -> usize;

    /// Returns the bit precision of the ciphertext.
    fn k(&self) -> usize;
}

pub trait SetMetaData {
    fn set_basek(&mut self, basek: usize);
    fn set_k(&mut self, k: usize);
}

pub trait Decompress<B: Backend, C> {
    fn decompress(&mut self, module: &Module<B>, other: &C)
    where
        Module<B>: VecZnxFillUniform + VecZnxCopy;
}