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    use std::{borrow::Cow, fmt};

    use actix_web::{
        http::header::{HeaderValue, InvalidHeaderValue, TryIntoHeaderValue},
        web::{BufMut, BytesMut},
    };

    use crate::headers::authorization::{errors::ParseError, scheme::Scheme};

    /// Credentials for `Bearer` authentication scheme, defined in [RFC 6750].
    ///
    /// Should be used in combination with [`Authorization`] header.
    ///
    /// [RFC 6750]: https://tools.ietf.org/html/rfc6750
    /// [`Authorization`]: crate::headers::authorization::Authorization
    #[derive(Clone, Eq, Ord, PartialEq, PartialOrd)]
    pub struct Bearer {
        token: Cow<'static, str>,
    }

    impl Bearer {
        /// Creates new `Bearer` credentials with the token provided.
        ///
        /// # Example
        /// ```
        /// # use actix_web_httpauth::headers::authorization::Bearer;
        /// let credentials = Bearer::new("mF_9.B5f-4.1JqM");
        /// ```
        pub fn new<T>(token: T) -> Bearer
        where
            T: Into<Cow<'static, str>>,
        {
            Bearer {
                token: token.into(),
            }
        }

        /// Gets reference to the credentials token.
        pub fn token(&self) -> &str {
            self.token.as_ref()
        }
    }

    impl Scheme for Bearer {
        fn parse(header: &HeaderValue) -> Result<Self, ParseError> {
            // "Bearer *" length
            if header.len() < 8 {
                return Err(ParseError::Invalid);
            }

            let mut parts = header.to_str()?.splitn(2, ' ');

            match parts.next() {
                Some("Bearer") => {}
                _ => return Err(ParseError::MissingScheme),
            }

            let token = parts.next().ok_or(ParseError::Invalid)?;

            Ok(Bearer {
                token: token.to_string().into(),
            })
        }
    }

    impl fmt::Debug for Bearer {
        fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
            f.write_fmt(format_args!("Bearer ******"))
        }
    }

    impl fmt::Display for Bearer {
        fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
            f.write_fmt(format_args!("Bearer {}", self.token))
        }
    }

    impl TryIntoHeaderValue for Bearer {
        type Error = InvalidHeaderValue;

        fn try_into_value(self) -> Result<HeaderValue, Self::Error> {
            let mut buffer = BytesMut::with_capacity(7 + self.token.len());
            buffer.put(&b"Bearer "[..]);
            buffer.extend_from_slice(self.token.as_bytes());

            HeaderValue::from_maybe_shared(buffer.freeze())
        }
    }

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

        #[test]
        fn test_parse_header() {
            let value = HeaderValue::from_static("Bearer mF_9.B5f-4.1JqM");
            let scheme = Bearer::parse(&value);

            assert!(scheme.is_ok());
            let scheme = scheme.unwrap();
            assert_eq!(scheme.token, "mF_9.B5f-4.1JqM");
        }

        #[test]
        fn test_empty_header() {
            let value = HeaderValue::from_static("");
            let scheme = Bearer::parse(&value);

            assert!(scheme.is_err());
        }

        #[test]
        fn test_wrong_scheme() {
            let value = HeaderValue::from_static("OAuthToken foo");
            let scheme = Bearer::parse(&value);

            assert!(scheme.is_err());
        }

        #[test]
        fn test_missing_token() {
            let value = HeaderValue::from_static("Bearer ");
            let scheme = Bearer::parse(&value);

            assert!(scheme.is_err());
        }

        #[test]
        fn test_into_header_value() {
            let bearer = Bearer::new("mF_9.B5f-4.1JqM");

            let result = bearer.try_into_value();
            assert!(result.is_ok());
            assert_eq!(
                result.unwrap(),
                HeaderValue::from_static("Bearer mF_9.B5f-4.1JqM")
            );
        }
    }