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    use std::convert::{TryFrom, TryInto};

    use super::{Authority, Parts, PathAndQuery, Scheme};
    use crate::Uri;

    /// A builder for `Uri`s.
    ///
    /// This type can be used to construct an instance of `Uri`
    /// through a builder pattern.
    #[derive(Debug)]
    pub struct Builder {
        parts: Result<Parts, crate::Error>,
    }

    impl Builder {
        /// Creates a new default instance of `Builder` to construct a `Uri`.
        ///
        /// # Examples
        ///
        /// ```
        /// # use http::*;
        ///
        /// let uri = uri::Builder::new()
        ///     .scheme("https")
        ///     .authority("hyper.rs")
        ///     .path_and_query("/")
        ///     .build()
        ///     .unwrap();
        /// ```
        #[inline]
        pub fn new() -> Builder {
            Builder::default()
        }

        /// Set the `Scheme` for this URI.
        ///
        /// # Examples
        ///
        /// ```
        /// # use http::*;
        ///
        /// let mut builder = uri::Builder::new();
        /// builder.scheme("https");
        /// ```
        pub fn scheme<T>(self, scheme: T) -> Self
        where
            Scheme: TryFrom<T>,
            <Scheme as TryFrom<T>>::Error: Into<crate::Error>,
        {
            self.map(move |mut parts| {
                let scheme = scheme.try_into().map_err(Into::into)?;
                parts.scheme = Some(scheme);
                Ok(parts)
            })
        }

        /// Set the `Authority` for this URI.
        ///
        /// # Examples
        ///
        /// ```
        /// # use http::*;
        ///
        /// let uri = uri::Builder::new()
        ///     .authority("tokio.rs")
        ///     .build()
        ///     .unwrap();
        /// ```
        pub fn authority<T>(self, auth: T) -> Self
        where
            Authority: TryFrom<T>,
            <Authority as TryFrom<T>>::Error: Into<crate::Error>,
        {
            self.map(move |mut parts| {
                let auth = auth.try_into().map_err(Into::into)?;
                parts.authority = Some(auth);
                Ok(parts)
            })
        }

        /// Set the `PathAndQuery` for this URI.
        ///
        /// # Examples
        ///
        /// ```
        /// # use http::*;
        ///
        /// let uri = uri::Builder::new()
        ///     .path_and_query("/hello?foo=bar")
        ///     .build()
        ///     .unwrap();
        /// ```
        pub fn path_and_query<T>(self, p_and_q: T) -> Self
        where
            PathAndQuery: TryFrom<T>,
            <PathAndQuery as TryFrom<T>>::Error: Into<crate::Error>,
        {
            self.map(move |mut parts| {
                let p_and_q = p_and_q.try_into().map_err(Into::into)?;
                parts.path_and_query = Some(p_and_q);
                Ok(parts)
            })
        }

        /// Consumes this builder, and tries to construct a valid `Uri` from
        /// the configured pieces.
        ///
        /// # Errors
        ///
        /// This function may return an error if any previously configured argument
        /// failed to parse or get converted to the internal representation. For
        /// example if an invalid `scheme` was specified via `scheme("!@#%/^")`
        /// the error will be returned when this function is called rather than
        /// when `scheme` was called.
        ///
        /// Additionally, the various forms of URI require certain combinations of
        /// parts to be set to be valid. If the parts don't fit into any of the
        /// valid forms of URI, a new error is returned.
        ///
        /// # Examples
        ///
        /// ```
        /// # use http::*;
        ///
        /// let uri = Uri::builder()
        ///     .build()
        ///     .unwrap();
        /// ```
        pub fn build(self) -> Result<Uri, crate::Error> {
            let parts = self.parts?;
            Uri::from_parts(parts).map_err(Into::into)
        }

        // private

        fn map<F>(self, func: F) -> Self
        where
            F: FnOnce(Parts) -> Result<Parts, crate::Error>,
        {

            Builder {
                parts: self.parts.and_then(func),
            }
        }
    }

    impl Default for Builder {
        #[inline]
        fn default() -> Builder {
            Builder {
                parts: Ok(Parts::default()),
            }
        }
    }

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

        #[test]
        fn build_from_str() {
            let uri = Builder::new()
                .scheme(Scheme::HTTP)
                .authority("hyper.rs")
                .path_and_query("/foo?a=1")
                .build()
                .unwrap();
            assert_eq!(uri.scheme_str(), Some("http"));
            assert_eq!(uri.authority().unwrap().host(), "hyper.rs");
            assert_eq!(uri.path(), "/foo");
            assert_eq!(uri.query(), Some("a=1"));
        }

        #[test]
        fn build_from_string() {
            for i in 1..10 {
                let uri = Builder::new()
                    .path_and_query(format!("/foo?a={}", i))
                    .build()
                    .unwrap();
                let expected_query = format!("a={}", i);
                assert_eq!(uri.path(), "/foo");
                assert_eq!(uri.query(), Some(expected_query.as_str()));
            }
        }

        #[test]
        fn build_from_string_ref() {
            for i in 1..10 {
                let p_a_q = format!("/foo?a={}", i);
                let uri = Builder::new().path_and_query(&p_a_q).build().unwrap();
                let expected_query = format!("a={}", i);
                assert_eq!(uri.path(), "/foo");
                assert_eq!(uri.query(), Some(expected_query.as_str()));
            }
        }
    }