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use core::cmp::{Eq, PartialEq,};
use core::convert::{AsRef, AsMut};
use core::fmt::{self, Formatter, Debug};
use core::hash::{self};
use core::ops::{Deref, DerefMut};
use slice_ext::{SliceExt};

#[derive(Copy, Clone)]
pub struct Hash {
	hash: [u64; 8],
	len: usize
}

impl Hash {
	pub(crate) fn new(hash: [u64; 8], len: usize) -> Self {
		Hash {
			hash,
			len
		}
	}

	pub fn len(&self) -> usize {
		self.len
	}

	pub(crate) fn into_inner(self) -> [u64; 8] {
		self.hash
	}
}

impl AsRef<[u8]> for Hash {
	fn as_ref(&self) -> &[u8] {
		&self.hash.as_bytes()[..self.len]
	}
}

impl AsMut<[u8]> for Hash {
	fn as_mut<'a>(&'a mut self) -> &'a mut [u8] {
		&mut self.hash.as_mut_bytes()[..self.len]
	}
}

impl Debug for Hash {
	fn fmt(&self, fmt: &mut Formatter) -> fmt::Result {
		fmt::Debug::fmt(&**self, fmt)
	}
}

impl Deref for Hash {
	type Target = [u8];

	fn deref<'a>(&'a self) -> &'a Self::Target {
		self.as_ref()
	}
}

impl DerefMut for Hash {
	fn deref_mut<'a>(&'a mut self) -> &'a mut Self::Target {
		self.as_mut()
	}
}

impl Eq for Hash {}

impl hash::Hash for Hash {
	fn hash<H>(&self, hasher: &mut H) where H: hash::Hasher {
		hasher.write(&**self);
	}
}

impl PartialEq for Hash {
	fn eq(&self, rhs: &Self) -> bool {
		&**self == &**rhs
	}
}

impl PartialEq<[u8]> for Hash {
	fn eq(&self, rhs: &[u8]) -> bool {
		&**self == rhs
	}
}