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use core::ops::{Deref, DerefMut};
use {IV};
use slice_ext::{SliceExt, zero_bytes};

#[derive(Copy, Clone, Debug, Default, Eq, Hash, Ord, PartialEq, PartialOrd)]
pub struct ParameterBlock(pub [u64; 8]);

impl ParameterBlock {
	pub fn new() -> Self {
		Self::default()
	}

	pub fn digest_len(&self) -> u8 {
		self[0]
	}

	pub fn set_digest_len(mut self, digest_len: u8) -> Self {
		self[0] = digest_len;
		self
	}

	pub fn key_len(&self) -> u8 {
		self[1]
	}

	pub fn set_key_len(mut self, key_len: u8) -> Self {
		self[1] = key_len;
		self
	}

	pub fn fanout(&self) -> u8 {
		self[2]
	}

	pub fn set_fanout(mut self, fanout: u8) -> Self {
		self[2] = fanout;
		self
	}

	pub fn max_depth(&self) -> u8 {
		self[3]
	}

	pub fn set_max_depth(mut self, max_depth: u8) -> Self {
		self[3] = max_depth;
		self
	}

	pub fn max_leaf_len(&self) -> u32 {
		(self.0[0] >> 32) as u32
	}

	pub fn set_max_leaf_len(mut self, max_leaf_len: u32) -> Self {
		self[4..8].copy_from_slice([max_leaf_len].as_bytes());
		self
	}

	pub fn node_offset(&self) -> u64 {
		self.0[1]
	}

	pub fn set_node_offset(mut self, node_offset: u64) -> Self {
		self.0[1] = node_offset;
		self
	}

	pub fn node_depth(&self) -> u8 {
		self[16]
	}

	pub fn set_node_depth(mut self, node_depth: u8) -> Self {
		self[16] = node_depth;
		self
	}

	pub fn inner_len(&self) -> u8 {
		self[17]
	}

	pub fn set_inner_len(mut self, inner_len: u8) -> Self {
		self[17] = inner_len;
		self
	}

	pub fn salt(&self) -> &[u8] {
		&self[32..48]
	}

	pub fn set_salt(mut self, salt: &[u8]) -> Self {
		assert!(salt.len() <= 16, "salt length must be <= 16");
		self[32..32 + salt.len()].copy_from_slice(salt);
		zero_bytes(&mut self[32 + salt.len()..48]);
		self
	}

	pub fn personalization(&self) -> &[u8] {
		&self[48..64]
	}

	pub fn set_personalization(mut self, personalization: &[u8]) -> Self {
		assert!(personalization.len() <= 16, "personalization length must be <= 16");

		self[48..48 + personalization.len()].copy_from_slice(personalization);
		zero_bytes(&mut self[48 + personalization.len()..64]);
		self
	}

	pub fn xor_with_iv(mut self) -> Self {
		for (a, b) in self.0.iter_mut().zip(IV.iter()) {
			*a ^= *b;
		}

		self
	}
}

impl AsRef<[u8]> for ParameterBlock {
	fn as_ref(&self) -> &[u8] {
		self.0.as_bytes()
	}
}

impl AsMut<[u8]> for ParameterBlock {
	fn as_mut(&mut self) -> &mut [u8] {
		self.0.as_mut_bytes()
	}
}

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

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

impl DerefMut for ParameterBlock {
	fn deref_mut(&mut self) -> &mut Self::Target {
		self.as_mut()
	}
}