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    use std::fmt;
    use std::str::FromStr;
    use std::cmp::Ordering;
    use std::hash::{Hash, Hasher};
    use serde;
    use serde::de::Unexpected;
    use hex::{ToHex, FromHex};
    use primitives::hash::H256 as GlobalH256;
    use primitives::hash::H160 as GlobalH160;

    macro_rules! impl_hash {
    	($name: ident, $other: ident, $size: expr) => {
    		/// Hash serialization
    		#[derive(Eq)]
    		pub struct $name([u8; $size]);

    		impl Default for $name {
    			fn default() -> Self {
    				$name([0; $size])
    			}
    		}

    		impl fmt::Debug for $name {
    			fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
    				write!(f, "{}", $other::from(self.0.clone()).to_hex::<String>())
    			}
    		}

    		impl<T> From<T> for $name where $other: From<T> {
    			fn from(o: T) -> Self {
    				$name($other::from(o).take())
    			}
    		}

    		impl FromStr for $name {
    			type Err = <$other as FromStr>::Err;

    			fn from_str(s: &str) -> Result<Self, Self::Err> {
    				let other = try!($other::from_str(s));
    				Ok($name(other.take()))
    			}
    		}

    		impl Into<$other> for $name {
    			fn into(self) -> $other {
    				$other::from(self.0)
    			}
    		}

    		impl PartialEq for $name {
    			fn eq(&self, other: &Self) -> bool {
    				let self_ref: &[u8] = &self.0;
    				let other_ref: &[u8] = &other.0;
    				self_ref == other_ref
    			}
    		}

    		impl PartialOrd for $name {
    			fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
    				let self_ref: &[u8] = &self.0;
    				let other_ref: &[u8] = &other.0;
    				self_ref.partial_cmp(other_ref)
    			}
    		}

    		impl Ord for $name {
    			fn cmp(&self, other: &Self) -> Ordering {
    				let self_ref: &[u8] = &self.0;
    				let other_ref: &[u8] = &other.0;
    				self_ref.cmp(other_ref)
    			}
    		}

    		impl Hash for $name {
    			fn hash<H>(&self, state: &mut H) where H: Hasher {
    				$other::from(self.0.clone()).hash(state)
    			}
    		}

    		impl Clone for $name {
    			fn clone(&self) -> Self {
    				let mut r = [0; $size];
    				r.copy_from_slice(&self.0);
    				$name(r)
    			}
    		}

    		impl serde::Serialize for $name {
    			fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    			where S: serde::Serializer {
    				let mut hex = String::new();
    				hex.push_str(&$other::from(self.0.clone()).to_hex::<String>());
    				serializer.serialize_str(&hex)
    			}
    		}

    		impl<'a> serde::Deserialize<'a> for $name {
    			fn deserialize<D>(deserializer: D) -> Result<$name, D::Error> where D: serde::Deserializer<'a> {
    				struct HashVisitor;

    				impl<'b> serde::de::Visitor<'b> for HashVisitor {
    					type Value = $name;

    					fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
    						formatter.write_str("a hash string")
    					}

    					fn visit_str<E>(self, value: &str) -> Result<Self::Value, E> where E: serde::de::Error {

    						if value.len() != $size * 2 {
    							return Err(E::invalid_value(Unexpected::Str(value), &self))
    						}

    						match value[..].from_hex::<Vec<u8>>() {
    							Ok(ref v) => {
    								let mut result = [0u8; $size];
    								result.copy_from_slice(v);
    								Ok($name($other::from(result).take()))
    							},
    							_ => Err(E::invalid_value(Unexpected::Str(value), &self))

    						}
    					}

    					fn visit_string<E>(self, value: String) -> Result<Self::Value, E> where E: serde::de::Error {
    						self.visit_str(value.as_ref())
    					}
    				}

    				deserializer.deserialize_identifier(HashVisitor)
    			}
    		}
    	}
    }

    impl_hash!(H256, GlobalH256, 32);
    impl_hash!(H160, GlobalH160, 20);

    impl H256 {
    	pub fn reversed(&self) -> Self {
    		let mut result = self.clone();
    		result.0.reverse();
    		result
    	}
    }

    #[cfg(test)]
    mod tests {
    	use super::H256;
    	use primitives::hash::H256 as GlobalH256;
    	use std::str::FromStr;

    	#[test]
    	fn hash_debug() {
    		let str_reversed = "00000000839a8e6886ab5951d76f411475428afc90947ee320161bbf18eb6048";
    		let reversed_hash = H256::from(str_reversed);
    		let debug_result = format!("{:?}", reversed_hash);
    		assert_eq!(debug_result, str_reversed);
    	}

    	#[test]
    	fn hash_from_str() {
    		let str_reversed = "00000000839a8e6886ab5951d76f411475428afc90947ee320161bbf18eb6048";
    		match H256::from_str(str_reversed) {
    			Ok(reversed_hash) => assert_eq!(format!("{:?}", reversed_hash), str_reversed),
    			_ => panic!("unexpected"),
    		}

    		let str_reversed = "XXXYYY";
    		match H256::from_str(str_reversed) {
    			Ok(_) => panic!("unexpected"),
    			_ => (),
    		}
    	}

    	#[test]
    	fn hash_to_global_hash() {
    		let str_reversed = "00000000839a8e6886ab5951d76f411475428afc90947ee320161bbf18eb6048";
    		let reversed_hash = H256::from(str_reversed);
    		let global_hash = GlobalH256::from(str_reversed);
    		let global_converted: GlobalH256 = reversed_hash.into();
    		assert_eq!(global_converted, global_hash);
    	}
    }

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