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    use std::io;
    use bytes::Bytes;
    use ser::{Serializable, Deserializable, Stream, Reader, Error as ReaderError};
    use {Payload, MessageResult};

    pub const FILTERLOAD_MAX_FILTER_LEN: usize = 36_000;
    pub const FILTERLOAD_MAX_HASH_FUNCS: usize = 50;

    #[derive(Debug, PartialEq, Clone, Copy)]
    #[repr(u8)]
    /// Controls how the filter is updated after match is found.
    pub enum FilterFlags {
    	/// Means the filter is not adjusted when a match is found.
    	None = 0,
    	/// Means if the filter matches any data element in a scriptPubKey the outpoint is serialized and inserted into the filter.
    	All = 1,
    	/// Means the outpoint is inserted into the filter only if a data element in the scriptPubKey is matched, and that script is
    	/// of the standard "pay to pubkey" or "pay to multisig" forms.
    	PubKeyOnly = 2,
    }

    #[derive(Debug, PartialEq)]
    pub struct FilterLoad {
    	// TODO: check how this should be serialized
    	pub filter: Bytes,
    	pub hash_functions: u32,
    	pub tweak: u32,
    	pub flags: FilterFlags,
    }

    impl Payload for FilterLoad {
    	fn version() -> u32 {
    		70001
    	}

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

    	fn deserialize_payload<T>(reader: &mut Reader<T>, _version: u32) -> MessageResult<Self> where T: io::Read {
    		let filterload = FilterLoad {
    			filter: try!(reader.read()),
    			hash_functions: try!(reader.read()),
    			tweak: try!(reader.read()),
    			flags: try!(reader.read()),
    		};

    		Ok(filterload)
    	}

    	fn serialize_payload(&self, stream: &mut Stream, _version: u32) -> MessageResult<()> {
    		stream
    			.append(&self.filter)
    			.append(&self.hash_functions)
    			.append(&self.tweak)
    			.append(&self.flags);
    		Ok(())
    	}
    }

    impl FilterFlags {
    	pub fn from_u8(v: u8) -> Option<Self> {
    		match v {
    			0 => Some(FilterFlags::None),
    			1 => Some(FilterFlags::All),
    			2 => Some(FilterFlags::PubKeyOnly),
    			_ => None,
    		}
    	}
    }

    impl From<FilterFlags> for u8 {
    	fn from(i: FilterFlags) -> Self {
    		i as u8
    	}
    }

    impl Serializable for FilterFlags {
    	fn serialize(&self, stream: &mut Stream) {
    		stream.append(&u8::from(*self));
    	}
    }

    impl Deserializable for FilterFlags {
    	fn deserialize<T>(reader: &mut Reader<T>) -> Result<Self, ReaderError> where T: io::Read {
    		let t: u8 = try!(reader.read());
    		FilterFlags::from_u8(t).ok_or(ReaderError::MalformedData)
    	}
    }

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