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

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

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

    /// Credentials for `Basic` authentication scheme, defined in [RFC 7617](https://tools.ietf.org/html/rfc7617)
    #[derive(Clone, Eq, Ord, PartialEq, PartialOrd)]
    pub struct Basic {
        user_id: Cow<'static, str>,
        password: Option<Cow<'static, str>>,
    }

    impl Basic {
        /// Creates `Basic` credentials with provided `user_id` and optional
        /// `password`.
        ///
        /// ## Example
        ///
        /// ```
        /// # use actix_web_httpauth::headers::authorization::Basic;
        /// let credentials = Basic::new("Alladin", Some("open sesame"));
        /// ```
        pub fn new<U, P>(user_id: U, password: Option<P>) -> Basic
        where
            U: Into<Cow<'static, str>>,
            P: Into<Cow<'static, str>>,
        {
            Basic {
                user_id: user_id.into(),
                password: password.map(Into::into),
            }
        }

        /// Returns client's user-ID.
        pub fn user_id(&self) -> &Cow<'static, str> {
            &self.user_id
        }

        /// Returns client's password if provided.
        pub fn password(&self) -> Option<&Cow<'static, str>> {
            self.password.as_ref()
        }
    }

    impl Scheme for Basic {
        fn parse(header: &HeaderValue) -> Result<Self, ParseError> {
            // "Basic *" length
            if header.len() < 7 {
                return Err(ParseError::Invalid);
            }

            let mut parts = header.to_str()?.splitn(2, ' ');
            match parts.next() {
                Some(scheme) if scheme == "Basic" => (),
                _ => return Err(ParseError::MissingScheme),
            }

            let decoded = base64::decode(parts.next().ok_or(ParseError::Invalid)?)?;
            let mut credentials = str::from_utf8(&decoded)?.splitn(2, ':');

            let user_id = credentials
                .next()
                .ok_or(ParseError::MissingField("user_id"))
                .map(|user_id| user_id.to_string().into())?;
            let password = credentials
                .next()
                .ok_or(ParseError::MissingField("password"))
                .map(|password| {
                    if password.is_empty() {
                        None
                    } else {
                        Some(password.to_string().into())
                    }
                })?;

            Ok(Basic { user_id, password })
        }
    }

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

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

    impl TryIntoHeaderValue for Basic {
        type Error = InvalidHeaderValue;

        fn try_into_value(self) -> Result<HeaderValue, Self::Error> {
            let mut credentials = BytesMut::with_capacity(
                self.user_id.len()
                    + 1 // ':'
                    + self.password.as_ref().map_or(0, |pwd| pwd.len()),
            );

            credentials.extend_from_slice(self.user_id.as_bytes());
            credentials.put_u8(b':');
            if let Some(ref password) = self.password {
                credentials.extend_from_slice(password.as_bytes());
            }

            // TODO: It would be nice not to allocate new `String`  here but write
            // directly to `value`
            let encoded = base64::encode(&credentials);
            let mut value = BytesMut::with_capacity(6 + encoded.len());
            value.put(&b"Basic "[..]);
            value.put(encoded.as_bytes());

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

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

        #[test]
        fn test_parse_header() {
            let value = HeaderValue::from_static("Basic QWxhZGRpbjpvcGVuIHNlc2FtZQ==");
            let scheme = Basic::parse(&value);

            assert!(scheme.is_ok());
            let scheme = scheme.unwrap();
            assert_eq!(scheme.user_id, "Aladdin");
            assert_eq!(scheme.password, Some("open sesame".into()));
        }

        #[test]
        fn test_empty_password() {
            let value = HeaderValue::from_static("Basic QWxhZGRpbjo=");
            let scheme = Basic::parse(&value);

            assert!(scheme.is_ok());
            let scheme = scheme.unwrap();
            assert_eq!(scheme.user_id, "Aladdin");
            assert_eq!(scheme.password, None);
        }

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

            assert!(scheme.is_err());
        }

        #[test]
        fn test_wrong_scheme() {
            let value = HeaderValue::from_static("THOUSHALLNOTPASS please?");
            let scheme = Basic::parse(&value);

            assert!(scheme.is_err());
        }

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

            assert!(scheme.is_err());
        }

        #[test]
        fn test_missing_credentials_colon() {
            let value = HeaderValue::from_static("Basic QWxsYWRpbg==");
            let scheme = Basic::parse(&value);

            assert!(scheme.is_err());
        }

        #[test]
        fn test_into_header_value() {
            let basic = Basic {
                user_id: "Aladdin".into(),
                password: Some("open sesame".into()),
            };

            let result = basic.try_into_value();
            assert!(result.is_ok());
            assert_eq!(
                result.unwrap(),
                HeaderValue::from_static("Basic QWxhZGRpbjpvcGVuIHNlc2FtZQ==")
            );
        }
    }