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use std::fmt::{Formatter, Result};

use hyper::error::{self, Error};
use hyper::header::{HeaderFormat, Header};

const SECURELOCATION_HEADER_NAME: &'static str = "SECURELOCATION.UPNP.ORG";

/// Represents a header used to specify a secure url for a device's DDD.
///
/// Can be used instead of the `Location` header field.
#[derive(Clone, PartialEq, Eq, Hash, Debug)]
pub struct SecureLocation(pub String);

impl Header for SecureLocation {
    fn header_name() -> &'static str {
        SECURELOCATION_HEADER_NAME
    }

    fn parse_header(raw: &[Vec<u8>]) -> error::Result<Self> {
        if raw.len() != 1 || raw[0].is_empty() {
            return Err(Error::Header);
        }

        let owned_bytes = raw[0].clone();

        match String::from_utf8(owned_bytes) {
            Ok(n) => Ok(SecureLocation(n)),
            Err(_) => Err(Error::Header),
        }
    }
}

impl HeaderFormat for SecureLocation {
    fn fmt_header(&self, fmt: &mut Formatter) -> Result {
        try!(fmt.write_str(&self.0));

        Ok(())
    }
}

#[cfg(test)]
mod tests {
    use hyper::header::Header;

    use super::SecureLocation;

    #[test]
    fn positive_securelocation() {
        let securelocation_header_value = &[b"https://192.168.1.1/"[..].to_vec()];

        SecureLocation::parse_header(securelocation_header_value).unwrap();
    }

    #[test]
    fn positive_invalid_url() {
        let securelocation_header_value = &[b"just some text"[..].to_vec()];

        SecureLocation::parse_header(securelocation_header_value).unwrap();
    }

    #[test]
    #[should_panic]
    fn negative_empty() {
        let securelocation_header_value = &[b""[..].to_vec()];

        SecureLocation::parse_header(securelocation_header_value).unwrap();
    }

    #[test]
    #[should_panic]
    fn negative_invalid_utf8() {
        let securelocation_header_value = &[b"https://192.168.1.1/\x80"[..].to_vec()];

        SecureLocation::parse_header(securelocation_header_value).unwrap();
    }
}