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use {Blake2b, Blake2xb};
use blake2xb;
use hash::{Hash};
use slice_ext::{SliceExt};

pub trait Digest {
	type Output;

	fn len(&self) -> usize;

	fn write_u8(&mut self, data: &[u8]);

	fn finish(self) -> Self::Output;

	fn write_i8(&mut self, data: &[i8]) {
		self.write_u8(data.as_bytes());
	}

	fn write_i16(&mut self, data: &[i16]) {
		self.write_u8(data.as_bytes());
	}

	fn write_u16(&mut self, data: &[u16]) {
		self.write_u8(data.as_bytes());
	}

	fn write_i32(&mut self, data: &[i32]) {
		self.write_u8(data.as_bytes());
	}

	fn write_u32(&mut self, data: &[u32]) {
		self.write_u8(data.as_bytes());
	}

	fn write_i64(&mut self, data: &[i64]) {
		self.write_u8(data.as_bytes());
	}

	fn write_u64(&mut self, data: &[u64]) {
		self.write_u8(data.as_bytes());
	}

	fn write_isize(&mut self, data: &[isize]) {
		self.write_u8(data.as_bytes());
	}

	fn write_usize(&mut self, data: &[usize]) {
		self.write_u8(data.as_bytes());
	}
}

impl Digest for Blake2b {
	type Output = Hash;

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

	fn write_u8(&mut self, data: &[u8]) {
		self.update(data);
	}

	fn finish(self) -> Self::Output {
		self.finish()
	}
}

impl Digest for Blake2xb {
	type Output = blake2xb::Iter;

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

	fn write_u8(&mut self, data: &[u8]) {
		self.update(data);
	}

	fn finish(self) -> Self::Output {
		self.finish()
	}
}