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    use crate::rust::{fmt, vec::Vec};
    use crate::io;
    use super::{
    	Deserialize, Serialize, Error, VarUint7, VarInt7, VarUint1, CountedList,
    	CountedListWriter, VarUint32,
    };

    /// Type definition in types section. Currently can be only of the function type.
    #[derive(Debug, Clone, PartialEq, Hash, Eq)]
    pub enum Type {
    	/// Function type.
    	Function(FunctionType),
    }

    impl Deserialize for Type {
    	type Error = Error;

    	fn deserialize<R: io::Read>(reader: &mut R) -> Result<Self, Self::Error> {
    		Ok(Type::Function(FunctionType::deserialize(reader)?))
    	}
    }

    impl Serialize for Type {
    	type Error = Error;

    	fn serialize<W: io::Write>(self, writer: &mut W) -> Result<(), Self::Error> {
    		match self {
    			Type::Function(fn_type) => fn_type.serialize(writer)
    		}
    	}
    }

    /// Value type.
    #[derive(Clone, Copy, Debug, PartialEq, Hash, Eq)]
    pub enum ValueType {
    	/// 32-bit signed integer
    	I32,
    	/// 64-bit signed integer
    	I64,
    	/// 32-bit float
    	F32,
    	/// 64-bit float
    	F64,
    	#[cfg(feature="simd")]
    	/// 128-bit SIMD register
    	V128,
    }

    impl Deserialize for ValueType {
    	type Error = Error;

    	fn deserialize<R: io::Read>(reader: &mut R) -> Result<Self, Self::Error> {
    		let val = VarInt7::deserialize(reader)?;

    		match val.into() {
    			-0x01 => Ok(ValueType::I32),
    			-0x02 => Ok(ValueType::I64),
    			-0x03 => Ok(ValueType::F32),
    			-0x04 => Ok(ValueType::F64),
    			#[cfg(feature="simd")]
    			-0x05 => Ok(ValueType::V128),
    			_ => Err(Error::UnknownValueType(val.into())),
    		}
    	}
    }

    impl Serialize for ValueType {
    	type Error = Error;

    	fn serialize<W: io::Write>(self, writer: &mut W) -> Result<(), Self::Error> {
    		let val: VarInt7 = match self {
    			ValueType::I32 => -0x01,
    			ValueType::I64 => -0x02,
    			ValueType::F32 => -0x03,
    			ValueType::F64 => -0x04,
    			#[cfg(feature="simd")]
    			ValueType::V128 => -0x05,
    		}.into();
    		val.serialize(writer)?;
    		Ok(())
    	}
    }

    impl fmt::Display for ValueType {
    	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
    		match *self {
    			ValueType::I32 => write!(f, "i32"),
    			ValueType::I64 => write!(f, "i64"),
    			ValueType::F32 => write!(f, "f32"),
    			ValueType::F64 => write!(f, "f64"),
    			#[cfg(feature="simd")]
    			ValueType::V128 => write!(f, "v128"),
    		}
    	}
    }

    /// Block type which is basically `ValueType` + NoResult (to define blocks that have no return type)
    #[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
    pub enum BlockType {
    	/// Value-type specified block type
    	Value(ValueType),
    	/// No specified block type
    	NoResult,
    }

    impl Deserialize for BlockType {
    	type Error = Error;

    	fn deserialize<R: io::Read>(reader: &mut R) -> Result<Self, Self::Error> {
    		let val = VarInt7::deserialize(reader)?;

    		match val.into() {
    			-0x01 => Ok(BlockType::Value(ValueType::I32)),
    			-0x02 => Ok(BlockType::Value(ValueType::I64)),
    			-0x03 => Ok(BlockType::Value(ValueType::F32)),
    			-0x04 => Ok(BlockType::Value(ValueType::F64)),
    			#[cfg(feature="simd")]
    			0x7b => Ok(BlockType::Value(ValueType::V128)),
    			-0x40 => Ok(BlockType::NoResult),
    			_ => Err(Error::UnknownValueType(val.into())),
    		}
    	}
    }

    impl Serialize for BlockType {
    	type Error = Error;

    	fn serialize<W: io::Write>(self, writer: &mut W) -> Result<(), Self::Error> {
    		let val: VarInt7 = match self {
    			BlockType::NoResult => -0x40i8,
    			BlockType::Value(ValueType::I32) => -0x01,
    			BlockType::Value(ValueType::I64) => -0x02,
    			BlockType::Value(ValueType::F32) => -0x03,
    			BlockType::Value(ValueType::F64) => -0x04,
    			#[cfg(feature="simd")]
    			BlockType::Value(ValueType::V128) => 0x7b,
    		}.into();
    		val.serialize(writer)?;
    		Ok(())
    	}
    }

    /// Function signature type.
    #[derive(Debug, Clone, PartialEq, Hash, Eq)]
    pub struct FunctionType {
    	form: u8,
    	params: Vec<ValueType>,
    	return_type: Option<ValueType>,
    }

    impl Default for FunctionType {
    	fn default() -> Self {
    		FunctionType {
    			form: 0x60,
    			params: Vec::new(),
    			return_type: None,
    		}
    	}
    }

    impl FunctionType {
    	/// New function type given the signature in-params(`params`) and return type (`return_type`)
    	pub fn new(params: Vec<ValueType>, return_type: Option<ValueType>) -> Self {
    		FunctionType {
    			params: params,
    			return_type: return_type,
    			..Default::default()
    		}
    	}
    	/// Function form (currently only valid value is `0x60`)
    	pub fn form(&self) -> u8 { self.form }
    	/// Parameters in the function signature.
    	pub fn params(&self) -> &[ValueType] { &self.params }
    	/// Mutable parameters in the function signature.
    	pub fn params_mut(&mut self) -> &mut Vec<ValueType> { &mut self.params }
    	/// Return type in the function signature, if any.
    	pub fn return_type(&self) -> Option<ValueType> { self.return_type }
    	/// Mutable type in the function signature, if any.
    	pub fn return_type_mut(&mut self) -> &mut Option<ValueType> { &mut self.return_type }
    }

    impl Deserialize for FunctionType {
    	type Error = Error;

    	fn deserialize<R: io::Read>(reader: &mut R) -> Result<Self, Self::Error> {
    		let form: u8 = VarUint7::deserialize(reader)?.into();

    		if form != 0x60 {
    			return Err(Error::UnknownFunctionForm(form));
    		}

    		let params: Vec<ValueType> = CountedList::deserialize(reader)?.into_inner();

    		let return_types: u32 = VarUint32::deserialize(reader)?.into();

    		let return_type = if return_types == 1 {
    			Some(ValueType::deserialize(reader)?)
    		} else if return_types == 0 {
    			None
    		} else {
    			return Err(Error::Other("Return types length should be 0 or 1"));
    		};

    		Ok(FunctionType {
    			form: form,
    			params: params,
    			return_type: return_type,
    		})
    	}
    }

    impl Serialize for FunctionType {
    	type Error = Error;

    	fn serialize<W: io::Write>(self, writer: &mut W) -> Result<(), Self::Error> {
    		VarUint7::from(self.form).serialize(writer)?;

    		let data = self.params;
    		let counted_list = CountedListWriter::<ValueType, _>(
    			data.len(),
    			data.into_iter().map(Into::into),
    		);
    		counted_list.serialize(writer)?;

    		if let Some(return_type) = self.return_type {
    			VarUint1::from(true).serialize(writer)?;
    			return_type.serialize(writer)?;
    		} else {
    			VarUint1::from(false).serialize(writer)?;
    		}

    		Ok(())
    	}
    }

    /// Table element type.
    #[derive(Clone, Copy, Debug, PartialEq)]
    pub enum TableElementType {
    	/// A reference to a function with any signature.
    	AnyFunc,
    }

    impl Deserialize for TableElementType {
    	type Error = Error;

    	fn deserialize<R: io::Read>(reader: &mut R) -> Result<Self, Self::Error> {
    		let val = VarInt7::deserialize(reader)?;

    		match val.into() {
    			-0x10 => Ok(TableElementType::AnyFunc),
    			_ => Err(Error::UnknownTableElementType(val.into())),
    		}
    	}
    }

    impl Serialize for TableElementType {
    	type Error = Error;

    	fn serialize<W: io::Write>(self, writer: &mut W) -> Result<(), Self::Error> {
    		let val: VarInt7 = match self {
    			TableElementType::AnyFunc => -0x10,
    		}.into();
    		val.serialize(writer)?;
    		Ok(())
    	}
    }

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