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    use std::{fmt, ops};
    use secp256k1::key;
    use secp256k1::{Message as SecpMessage, RecoveryId, RecoverableSignature, Error as SecpError, Signature as SecpSignature};
    use hex::ToHex;
    use crypto::dhash160;
    use hash::{H264, H520};
    use {AddressHash, Error, CompactSignature, Signature, Message, SECP256K1};

    /// Secret public key
    pub enum Public {
    	/// Normal version of public key
    	Normal(H520),
    	/// Compressed version of public key
    	Compressed(H264),
    }

    impl Public {
    	pub fn from_slice(data: &[u8]) -> Result<Self, Error> {
    		match data.len() {
    			33 => {
    				let mut public = H264::default();
    				public.copy_from_slice(data);
    				Ok(Public::Compressed(public))
    			},
    			65 => {
    				let mut public = H520::default();
    				public.copy_from_slice(data);
    				Ok(Public::Normal(public))
    			},
    			_ => Err(Error::InvalidPublic)
    		}
    	}

    	pub fn address_hash(&self) -> AddressHash {
    		dhash160(self)
    	}

    	pub fn verify(&self, message: &Message, signature: &Signature) -> Result<bool, Error> {
    		let context = &SECP256K1;
    		let public = try!(key::PublicKey::from_slice(context, self));
    		let mut signature = try!(SecpSignature::from_der_lax(context, signature));
    		signature.normalize_s(context);
    		let message = try!(SecpMessage::from_slice(&**message));
    		match context.verify(&message, &signature, &public) {
    			Ok(_) => Ok(true),
    			Err(SecpError::IncorrectSignature) => Ok(false),
    			Err(x) => Err(x.into()),
    		}
    	}

    	pub fn recover_compact(message: &Message, signature: &CompactSignature) -> Result<Self, Error> {
    		let context = &SECP256K1;
    		let recovery_id = (signature[0] - 27) & 3;
    		let compressed = (signature[0] - 27) & 4 != 0;
    		let recovery_id = try!(RecoveryId::from_i32(recovery_id as i32));
    		let signature = try!(RecoverableSignature::from_compact(context, &signature[1..65], recovery_id));
    		let message = try!(SecpMessage::from_slice(&**message));
    		let pubkey = try!(context.recover(&message, &signature));
    		let serialized = pubkey.serialize_vec(context, compressed);
    		let public = if compressed {
    			let mut public = H264::default();
    			public.copy_from_slice(&serialized[0..33]);
    			Public::Compressed(public)
    		} else {
    			let mut public = H520::default();
    			public.copy_from_slice(&serialized[0..65]);
    			Public::Normal(public)
    		};
    		Ok(public)
    	}
    }

    impl ops::Deref for Public {
    	type Target = [u8];

    	fn deref(&self) -> &Self::Target {
    		match *self {
    			Public::Normal(ref hash) => &**hash,
    			Public::Compressed(ref hash) => &**hash,
    		}
    	}
    }

    impl PartialEq for Public {
    	fn eq(&self, other: &Self) -> bool {
    		let s_slice: &[u8] = self;
    		let o_slice: &[u8] = other;
    		s_slice == o_slice
    	}
    }

    impl fmt::Debug for Public {
    	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
    		match *self {
    			Public::Normal(ref hash) => writeln!(f, "normal: {}", hash.to_hex::<String>()),
    			Public::Compressed(ref hash) => writeln!(f, "compressed: {}", hash.to_hex::<String>()),
    		}
    	}
    }

    impl fmt::Display for Public {
    	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
    		self.to_hex::<String>().fmt(f)
    	}
    }

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