use std::fmt::{mod, Show};

use header::{Header, HeaderFormat};
use super::util::from_one_raw_str;

/// The `Content-Length` header.
///
/// Simply a wrapper around a `uint`.
#[deriving(Clone, PartialEq, Show)]
pub struct ContentLength(pub uint);

impl Header for ContentLength {
    fn header_name(_: Option<ContentLength>) -> &'static str {
        "Content-Length"
    }

    fn parse_header(raw: &[Vec<u8>]) -> Option<ContentLength> {
        from_one_raw_str(raw).map(|u| ContentLength(u))
    }
}

impl HeaderFormat for ContentLength {
    fn fmt_header(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
        let ContentLength(ref value) = *self;
        value.fmt(fmt)
    }
}

impl ContentLength {
    /// Returns the wrapped length.
    #[inline]
    pub fn len(&self) -> uint {
        let ContentLength(len) = *self;
        len
    }
}