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    use std::io;
    use chain::BlockHeader;
    use ser::{Stream, Reader, Serializable, Deserializable, CompactInteger, Error as ReaderError};
    use {Payload, MessageResult};

    pub const HEADERS_MAX_HEADERS_LEN: usize = 2000;

    #[derive(Debug, PartialEq)]
    pub struct Headers {
    	pub headers: Vec<BlockHeader>,
    }

    impl Headers {
    	pub fn with_headers(headers: Vec<BlockHeader>) -> Self {
    		Headers {
    			headers: headers,
    		}
    	}
    }

    #[derive(Debug, PartialEq)]
    struct HeaderWithTxnCount {
    	header: BlockHeader,
    }

    impl From<HeaderWithTxnCount> for BlockHeader {
    	fn from(header: HeaderWithTxnCount) -> BlockHeader {
    		header.header
    	}
    }

    #[derive(Debug, PartialEq)]
    struct HeaderWithTxnCountRef<'a> {
    	header: &'a BlockHeader,
    }

    impl<'a> From<&'a BlockHeader> for HeaderWithTxnCountRef<'a> {
    	fn from(header: &'a BlockHeader) -> Self {
    		HeaderWithTxnCountRef {
    			header: header,
    		}
    	}
    }

    impl Payload for Headers {
    	fn version() -> u32 {
    		0
    	}

    	fn command() -> &'static str {
    		"headers"
    	}

    	fn deserialize_payload<T>(reader: &mut Reader<T>, _version: u32) -> MessageResult<Self> where T: io::Read {
    		let headers_with_txn_count: Vec<HeaderWithTxnCount> = try!(reader.read_list());
    		let headers = Headers {
    			headers: headers_with_txn_count.into_iter().map(Into::into).collect(),
    		};

    		Ok(headers)
    	}

    	fn serialize_payload(&self, stream: &mut Stream, _version: u32) -> MessageResult<()> {
    		let headers_with_txn_count: Vec<HeaderWithTxnCountRef> = self.headers.iter().map(Into::into).collect();
    		stream.append_list(&headers_with_txn_count);
    		Ok(())
    	}
    }

    impl<'a> Serializable for HeaderWithTxnCountRef<'a> {
    	fn serialize(&self, stream: &mut Stream) {
    		stream
    			.append(self.header)
    			.append(&CompactInteger::from(0u32));
    	}
    }

    impl Deserializable for HeaderWithTxnCount {
    	fn deserialize<T>(reader: &mut Reader<T>) -> Result<Self, ReaderError> where T: io::Read {
    		let header = HeaderWithTxnCount {
    			header: try!(reader.read()),
    		};

    		let txn_count: CompactInteger = try!(reader.read());
    		if txn_count != 0u32.into() {
    			return Err(ReaderError::MalformedData);
    		}

    		Ok(header)
    	}
    }

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