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    use std::fmt;

    use super::{ErrorKind, InvalidUri};

    /// The port component of a URI.
    pub struct Port<T> {
        port: u16,
        repr: T,
    }

    impl<T> Port<T> {
        /// Returns the port number as a `u16`.
        ///
        /// # Examples
        ///
        /// Port as `u16`.
        ///
        /// ```
        /// # use http::uri::Authority;
        /// let authority: Authority = "example.org:80".parse().unwrap();
        ///
        /// let port = authority.port().unwrap();
        /// assert_eq!(port.as_u16(), 80);
        /// ```
        pub fn as_u16(&self) -> u16 {
            self.port
        }
    }

    impl<T> Port<T>
    where
        T: AsRef<str>,
    {
        /// Converts a `str` to a port number.
        ///
        /// The supplied `str` must be a valid u16.
        pub(crate) fn from_str(bytes: T) -> Result<Self, InvalidUri> {
            bytes
                .as_ref()
                .parse::<u16>()
                .map(|port| Port { port, repr: bytes })
                .map_err(|_| ErrorKind::InvalidPort.into())
        }

        /// Returns the port number as a `str`.
        ///
        /// # Examples
        ///
        /// Port as `str`.
        ///
        /// ```
        /// # use http::uri::Authority;
        /// let authority: Authority = "example.org:80".parse().unwrap();
        ///
        /// let port = authority.port().unwrap();
        /// assert_eq!(port.as_str(), "80");
        /// ```
        pub fn as_str(&self) -> &str {
            self.repr.as_ref()
        }
    }

    impl<T> fmt::Debug for Port<T>
    where
        T: fmt::Debug,
    {
        fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
            f.debug_tuple("Port").field(&self.port).finish()
        }
    }

    impl<T> fmt::Display for Port<T> {
        fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
            // Use `u16::fmt` so that it respects any formatting flags that
            // may have been set (like padding, align, etc).
            fmt::Display::fmt(&self.port, f)
        }
    }

    impl<T> From<Port<T>> for u16 {
        fn from(port: Port<T>) -> Self {
            port.as_u16()
        }
    }

    impl<T> AsRef<str> for Port<T>
    where
        T: AsRef<str>,
    {
        fn as_ref(&self) -> &str {
            self.as_str()
        }
    }

    impl<T, U> PartialEq<Port<U>> for Port<T> {
        fn eq(&self, other: &Port<U>) -> bool {
            self.port == other.port
        }
    }

    impl<T> PartialEq<u16> for Port<T> {
        fn eq(&self, other: &u16) -> bool {
            self.port == *other
        }
    }

    impl<T> PartialEq<Port<T>> for u16 {
        fn eq(&self, other: &Port<T>) -> bool {
            other.port == *self
        }
    }

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

        #[test]
        fn partialeq_port() {
            let port_a = Port::from_str("8080").unwrap();
            let port_b = Port::from_str("8080").unwrap();
            assert_eq!(port_a, port_b);
        }

        #[test]
        fn partialeq_port_different_reprs() {
            let port_a = Port {
                repr: "8081",
                port: 8081,
            };
            let port_b = Port {
                repr: String::from("8081"),
                port: 8081,
            };
            assert_eq!(port_a, port_b);
            assert_eq!(port_b, port_a);
        }

        #[test]
        fn partialeq_u16() {
            let port = Port::from_str("8080").unwrap();
            // test equals in both directions
            assert_eq!(port, 8080);
            assert_eq!(8080, port);
        }

        #[test]
        fn u16_from_port() {
            let port = Port::from_str("8080").unwrap();
            assert_eq!(8080, u16::from(port));
        }
    }