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use core::mem::MaybeUninit;

use ::refpool::{PoolClone, PoolDefault};

use crate::types::ChunkLength;
use crate::Chunk;

impl<A, N> PoolDefault for Chunk<A, N>
where
    N: ChunkLength<A>,
{
    unsafe fn default_uninit(target: &mut MaybeUninit<Self>) {
        let ptr = target.as_mut_ptr();
        let left_ptr: *mut usize = &mut (*ptr).left;
        let right_ptr: *mut usize = &mut (*ptr).right;
        left_ptr.write(0);
        right_ptr.write(0);
    }
}

impl<A, N> PoolClone for Chunk<A, N>
where
    A: Clone,
    N: ChunkLength<A>,
{
    unsafe fn clone_uninit(&self, target: &mut MaybeUninit<Self>) {
        let ptr = target.as_mut_ptr();
        let left_ptr: *mut usize = &mut (*ptr).left;
        let right_ptr: *mut usize = &mut (*ptr).right;
        let data_ptr: *mut _ = &mut (*ptr).data;
        let data_ptr: *mut A = (*data_ptr).as_mut_ptr().cast();
        left_ptr.write(self.left);
        right_ptr.write(self.right);
        for index in self.left..self.right {
            data_ptr.add(index).write((*self.ptr(index)).clone());
        }
    }
}

#[cfg(test)]
mod test {
    use super::*;
    use ::refpool::{Pool, PoolRef};
    use std::iter::FromIterator;

    #[test]
    fn default_and_clone() {
        let pool: Pool<Chunk<usize>> = Pool::new(16);
        let mut ref1 = PoolRef::default(&pool);
        {
            let chunk = PoolRef::make_mut(&pool, &mut ref1);
            chunk.push_back(1);
            chunk.push_back(2);
            chunk.push_back(3);
        }
        let ref2 = PoolRef::cloned(&pool, &ref1);
        let ref3 = PoolRef::clone_from(&pool, &Chunk::from_iter(1..=3));
        assert_eq!(Chunk::<usize>::from_iter(1..=3), *ref1);
        assert_eq!(Chunk::<usize>::from_iter(1..=3), *ref2);
        assert_eq!(Chunk::<usize>::from_iter(1..=3), *ref3);
        assert_eq!(ref1, ref2);
        assert_eq!(ref1, ref3);
        assert_eq!(ref2, ref3);
        assert!(!PoolRef::ptr_eq(&ref1, &ref2));
    }
}