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use nom::{IResult, character::is_space};

#[derive(Debug)]
pub struct RequestCookie<'a> {
  pub name: &'a [u8],
  pub value: &'a [u8],
  pub semicolon: Option<&'a [u8]>,
  pub spaces: &'a [u8]
}

impl<'a> RequestCookie<'a> {
  pub fn get_full_length(&self) -> usize {
    let semicolon = if self.semicolon.is_some() { 1 } else { 0 };
    let space = self.spaces.len();

    self.name.len() + self.value.len() + semicolon + space + 1 // +1 is for =
  }
}

pub fn is_cookie_value_char(chr: u8) -> bool {
  // chars: (space) , ;
  chr != 32 && chr != 44 && chr != 59
}

named!(pub single_request_cookie<RequestCookie>,
  do_parse!(
    name: is_not!("=") >>
          tag!("=") >>
    value: take_while_complete!(is_cookie_value_char) >>
    semicolon: opt!(complete!(tag!(";"))) >>
    spaces: take_while_complete!(is_space) >>
    (RequestCookie {
      name: name,
      value: value,
      semicolon: semicolon,
      spaces: spaces
    })
  )
);

pub fn parse_request_cookies(input: &[u8]) -> Option<Vec<RequestCookie>> {
  let res: IResult<&[u8], Vec<RequestCookie>> = many0!(input, complete!(single_request_cookie));

  if let Ok((_, o)) = res {
    Some(o)
  } else {
    None
  }
}


#[cfg(test)]
mod tests {
  use super::*;

  #[test]
  fn header_cookies_request_cookies() {
    let none_cookies = parse_request_cookies(b"FOOBAR").unwrap();
    let some_cookies = parse_request_cookies(b"FOO=BAR;BAR=FOO; SOZUBALANCEID=0;   SOZU=SOZU").unwrap();

    assert_eq!(none_cookies.len(), 0);
    assert_eq!(some_cookies.len(), 4);

    assert_eq!(some_cookies[0].name, b"FOO");
    assert_eq!(some_cookies[0].value, b"BAR");
    assert_eq!(some_cookies[0].semicolon.is_some(), true);
    assert_eq!(some_cookies[0].spaces.len(), 0);

    assert_eq!(some_cookies[1].name, b"BAR");
    assert_eq!(some_cookies[1].value, b"FOO");
    assert_eq!(some_cookies[1].semicolon.is_some(), true);
    assert_eq!(some_cookies[1].spaces.len(), 1);

    assert_eq!(some_cookies[2].name, b"SOZUBALANCEID");
    assert_eq!(some_cookies[2].value, b"0");
    assert_eq!(some_cookies[2].semicolon.is_some(), true);
    assert_eq!(some_cookies[2].spaces.len(), 3);

    assert_eq!(some_cookies[3].name, b"SOZU");
    assert_eq!(some_cookies[3].value, b"SOZU");
    assert_eq!(some_cookies[3].semicolon.is_some(), false);
    assert_eq!(some_cookies[3].spaces.len(), 0);
  }
}