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use crate::bits::BitSetViewExt;
use crate::join::{IntoJoin, Join};
use crate::smat::{MatrixMask, RowRead, RowUpdate, RowWrite, SMatrix, Store, StoreMut};
use crate::traits::{IndexExcl, IndexLowerBound};
use std::mem;

/// Wrapper to allow immutable access to the elments of an SMatrix in row-major order. Used for join and merge oprations.
pub struct WrapRowRead<'a, M, S>
where
    M: MatrixMask,
    S: Store,
{
    pub(crate) mat: &'a SMatrix<M, S>,
}

impl<'a, M, S> IndexExcl<usize> for WrapRowRead<'a, M, S>
where
    M: MatrixMask,
    S: Store,
{
    type Item = RowRead<'a, M, S>;

    fn index(&mut self, idx: usize) -> Self::Item {
        self.mat.read_row(idx)
    }
}

impl<'a, M, S> IndexLowerBound<usize> for WrapRowRead<'a, M, S>
where
    M: MatrixMask,
    S: Store,
{
    fn lower_bound(&mut self, idx: usize) -> Option<usize> {
        self.mat.row_mask.lower_bound(idx)
    }
}

impl<'a, M, S> IntoJoin for WrapRowRead<'a, M, S>
where
    M: MatrixMask,
    S: Store,
{
    type Store = Self;

    fn into_join(self) -> Join<Self::Store> {
        Join::from_parts(0..self.mat.capacity(), self)
    }
}

/// Wrapper to allow mutable access to the elments of an SMatrix in row-major order. Used for join and merge oprations.
pub struct WrapRowUpdate<'a, M, S>
where
    M: MatrixMask,
    S: Store,
{
    pub(crate) mat: &'a mut SMatrix<M, S>,
}

impl<'a, M, S> IndexExcl<usize> for WrapRowUpdate<'a, M, S>
where
    M: MatrixMask,
    S: StoreMut,
{
    type Item = RowUpdate<'a, M, S>;

    fn index(&mut self, idx: usize) -> Self::Item {
        unsafe { mem::transmute(self.mat.update_row(idx)) } //GAT
    }
}

impl<'a, M, S> IndexLowerBound<usize> for WrapRowUpdate<'a, M, S>
where
    M: MatrixMask,
    S: StoreMut,
{
    fn lower_bound(&mut self, idx: usize) -> Option<usize> {
        self.mat.row_mask.lower_bound(idx)
    }
}

impl<'a, M, S> IntoJoin for WrapRowUpdate<'a, M, S>
where
    M: MatrixMask,
    S: StoreMut,
{
    type Store = Self;

    fn into_join(self) -> Join<Self::Store> {
        Join::from_parts(0..self.mat.capacity(), self)
    }
}

/// Wrapper to allow Entry based access to the elments of an SMatrix in row-major order. Used for join and merge oprations.
pub struct WrapRowWrite<'a, M, S>
where
    M: MatrixMask,
    S: StoreMut,
{
    pub(crate) mat: &'a mut SMatrix<M, S>,
}

impl<'a, M, S> IndexExcl<usize> for WrapRowWrite<'a, M, S>
where
    M: MatrixMask,
    S: StoreMut,
{
    type Item = RowWrite<'a, M, S>;

    fn index(&mut self, idx: usize) -> Self::Item {
        unsafe { mem::transmute(self.mat.write_row(idx)) } //GAT
    }
}

impl<'a, M, S> IndexLowerBound<usize> for WrapRowWrite<'a, M, S>
where
    M: MatrixMask,
    S: StoreMut,
{
    fn lower_bound(&mut self, idx: usize) -> Option<usize> {
        Some(idx)
    }
}

impl<'a, M, S> IntoJoin for WrapRowWrite<'a, M, S>
where
    M: MatrixMask,
    S: StoreMut,
{
    type Store = Self;

    fn into_join(self) -> Join<Self::Store> {
        Join::from_parts(0..self.mat.capacity(), self)
    }
}