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use header::{Header, Raw, CookiePair, CookieJar};
use std::fmt::{self, Display};
use std::str::from_utf8;

/// `Cookie` header, defined in [RFC6265](http://tools.ietf.org/html/rfc6265#section-5.4)
///
/// If the user agent does attach a Cookie header field to an HTTP
/// request, the user agent must send the cookie-string
/// as the value of the header field.
///
/// When the user agent generates an HTTP request, the user agent MUST NOT
/// attach more than one Cookie header field.
///
/// # Example values
/// * `SID=31d4d96e407aad42`
/// * `SID=31d4d96e407aad42; lang=en-US`
///
/// # Example
/// ```
/// # extern crate hyper;
/// # extern crate cookie;
/// # fn main() {
/// use hyper::header::{Headers, Cookie};
/// use cookie::Cookie as CookiePair;
///
/// let mut headers = Headers::new();
///
/// headers.set(
///    Cookie(vec![
///        CookiePair::new("foo".to_owned(), "bar".to_owned())
///    ])
/// );
/// # }
/// ```
#[derive(Clone, PartialEq, Debug)]
pub struct Cookie(pub Vec<CookiePair>);

__hyper__deref!(Cookie => Vec<CookiePair>);

impl Header for Cookie {
    fn header_name() -> &'static str {
        static NAME: &'static str = "Cookie";
        NAME
    }

    fn parse_header(raw: &Raw) -> ::Result<Cookie> {
        let mut cookies = Vec::with_capacity(raw.len());
        for cookies_raw in raw.iter() {
            let cookies_str = try!(from_utf8(&cookies_raw[..]));
            for cookie_str in cookies_str.split(';') {
                if let Ok(cookie) = cookie_str.trim().parse() {
                    cookies.push(cookie);
                } else {
                    return Err(::Error::Header);
                }
            }
        }

        if !cookies.is_empty() {
            Ok(Cookie(cookies))
        } else {
            Err(::Error::Header)
        }
    }

    fn fmt_header(&self, f: &mut fmt::Formatter) -> fmt::Result {
        let cookies = &self.0;
        for (i, cookie) in cookies.iter().enumerate() {
            if i != 0 {
                try!(f.write_str("; "));
            }
            try!(Display::fmt(&cookie.pair(), f));
        }
        Ok(())
    }
}

impl Cookie {
    /// This method can be used to create CookieJar that can be used
    /// to manipulate cookies and create a corresponding `SetCookie` header afterwards.
    pub fn to_cookie_jar(&self, key: &[u8]) -> CookieJar<'static> {
        let mut jar = CookieJar::new(key);
        for cookie in self.iter() {
            jar.add_original(cookie.clone());
        }
        jar
    }

    /// Extracts all cookies from `CookieJar` and creates Cookie header.
    /// Useful for clients.
    pub fn from_cookie_jar(jar: &CookieJar) -> Cookie {
        Cookie(jar.iter().collect())
    }
}


#[test]
fn test_parse() {
    let h = Header::parse_header(&b"foo=bar; baz=quux".as_ref().into());
    let c1 = CookiePair::new("foo".to_owned(), "bar".to_owned());
    let c2 = CookiePair::new("baz".to_owned(), "quux".to_owned());
    assert_eq!(h.ok(), Some(Cookie(vec![c1, c2])));
}

#[test]
fn test_fmt() {
    use header::Headers;

    let mut cookie_pair = CookiePair::new("foo".to_owned(), "bar".to_owned());
    cookie_pair.httponly = true;
    cookie_pair.path = Some("/p".to_owned());
    let cookie_header = Cookie(vec![
        cookie_pair,
        CookiePair::new("baz".to_owned(),"quux".to_owned())]);
    let mut headers = Headers::new();
    headers.set(cookie_header);

    assert_eq!(&headers.to_string()[..], "Cookie: foo=bar; baz=quux\r\n");
}

#[test]
fn cookie_jar() {
    let cookie_pair = CookiePair::new("foo".to_owned(), "bar".to_owned());
    let cookie_header = Cookie(vec![cookie_pair]);
    let jar = cookie_header.to_cookie_jar(&[]);
    let new_cookie_header = Cookie::from_cookie_jar(&jar);

    assert_eq!(cookie_header, new_cookie_header);
}


bench_header!(bench, Cookie, { vec![b"foo=bar; baz=quux".to_vec()] });