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use fd;
use std::io;
use Argdata;
use IntValue;
use ReadError;
use Value;

#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)]
pub struct Int<T> {
	value: T,
}

/// Create an argdata value representing an integer (of fixed width, e.g. `i32`).
pub fn int<T>(value: T) -> Int<T>
where
	T: Copy,
	IntValue<'static>: From<T>,
{
	Int { value }
}

impl<T: Copy> Int<T> where {
	pub fn value(&self) -> T {
		self.value
	}
}

impl<'d, T> Argdata<'d> for Int<T>
where
	T: Copy,
	IntValue<'static>: From<T>,
{
	fn read<'a>(&'a self) -> Result<Value<'a, 'd>, ReadError>
	where
		'd: 'a,
	{
		Ok(Value::Int(IntValue::from(self.value)))
	}

	fn serialized_length(&self) -> usize {
		IntValue::from(self.value).serialized_length() + 1
	}

	fn serialize(&self, writer: &mut io::Write, _: Option<&mut fd::FdMapping>) -> io::Result<()> {
		writer.write_all(&[5])?;
		IntValue::from(self.value).serialize(writer)
	}
}