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    // # References
    //
    // "The Content-Disposition Header Field" https://www.ietf.org/rfc/rfc2183.txt
    // "The Content-Disposition Header Field in the Hypertext Transfer Protocol (HTTP)" https://www.ietf.org/rfc/rfc6266.txt
    // "Returning Values from Forms: multipart/form-data" https://www.ietf.org/rfc/rfc2388.txt
    // Browser conformance tests at: http://greenbytes.de/tech/tc2231/
    // IANA assignment: http://www.iana.org/assignments/cont-disp/cont-disp.xhtml

    use language_tags::LanguageTag;
    use header;
    use header::{Header, IntoHeaderValue, Writer};
    use header::shared::Charset;

    use std::fmt::{self, Write};

    /// The implied disposition of the content of the HTTP body.
    #[derive(Clone, Debug, PartialEq)]
    pub enum DispositionType {
        /// Inline implies default processing
        Inline,
        /// Attachment implies that the recipient should prompt the user to save the response locally,
        /// rather than process it normally (as per its media type).
        Attachment,
        /// Extension type.  Should be handled by recipients the same way as Attachment
        Ext(String)
    }

    /// A parameter to the disposition type.
    #[derive(Clone, Debug, PartialEq)]
    pub enum DispositionParam {
        /// A Filename consisting of a Charset, an optional LanguageTag, and finally a sequence of
        /// bytes representing the filename
        Filename(Charset, Option<LanguageTag>, Vec<u8>),
        /// Extension type consisting of token and value.  Recipients should ignore unrecognized
        /// parameters.
        Ext(String, String)
    }

    /// A `Content-Disposition` header, (re)defined in [RFC6266](https://tools.ietf.org/html/rfc6266).
    ///
    /// The Content-Disposition response header field is used to convey
    /// additional information about how to process the response payload, and
    /// also can be used to attach additional metadata, such as the filename
    /// to use when saving the response payload locally.
    ///
    /// # ABNF

    /// ```text
    /// content-disposition = "Content-Disposition" ":"
    ///                       disposition-type *( ";" disposition-parm )
    ///
    /// disposition-type    = "inline" | "attachment" | disp-ext-type
    ///                       ; case-insensitive
    ///
    /// disp-ext-type       = token
    ///
    /// disposition-parm    = filename-parm | disp-ext-parm
    ///
    /// filename-parm       = "filename" "=" value
    ///                     | "filename*" "=" ext-value
    ///
    /// disp-ext-parm       = token "=" value
    ///                     | ext-token "=" ext-value
    ///
    /// ext-token           = <the characters in token, followed by "*">
    /// ```
    ///
    /// # Example
    ///
    /// ```
    /// use actix_web::http::header::{ContentDisposition, DispositionType, DispositionParam, Charset};
    ///
    /// let cd1 = ContentDisposition {
    ///     disposition: DispositionType::Attachment,
    ///     parameters: vec![DispositionParam::Filename(
    ///       Charset::Iso_8859_1, // The character set for the bytes of the filename
    ///       None, // The optional language tag (see `language-tag` crate)
    ///       b"\xa9 Copyright 1989.txt".to_vec() // the actual bytes of the filename
    ///     )]
    /// };
    ///
    /// let cd2 = ContentDisposition {
    ///     disposition: DispositionType::Inline,
    ///     parameters: vec![DispositionParam::Filename(
    ///       Charset::Ext("UTF-8".to_owned()),
    ///       None,
    ///       "\u{2764}".as_bytes().to_vec()
    ///     )]
    /// };
    /// ```
    #[derive(Clone, Debug, PartialEq)]
    pub struct ContentDisposition {
        /// The disposition
        pub disposition: DispositionType,
        /// Disposition parameters
        pub parameters: Vec<DispositionParam>,
    }
    impl ContentDisposition {
        /// Parse a raw Content-Disposition header value
        pub fn from_raw(hv: &header::HeaderValue) -> Result<Self, ::error::ParseError> {
            header::from_one_raw_str(Some(hv)).and_then(|s: String| {
                let mut sections = s.split(';');
                let disposition = match sections.next() {
                    Some(s) => s.trim(),
                    None => return Err(::error::ParseError::Header),
                };

                let mut cd = ContentDisposition {
                    disposition: if disposition.eq_ignore_ascii_case("inline") {
                        DispositionType::Inline
                    } else if disposition.eq_ignore_ascii_case("attachment") {
                        DispositionType::Attachment
                    } else {
                        DispositionType::Ext(disposition.to_owned())
                    },
                    parameters: Vec::new(),
                };

                for section in sections {
                    let mut parts = section.splitn(2, '=');

                    let key = if let Some(key) = parts.next() {
                        key.trim()
                    } else {
                        return Err(::error::ParseError::Header);
                    };

                    let val = if let Some(val) = parts.next() {
                        val.trim()
                    } else {
                        return Err(::error::ParseError::Header);
                    };

                    cd.parameters.push(
                        if key.eq_ignore_ascii_case("filename") {
                            DispositionParam::Filename(
                                Charset::Ext("UTF-8".to_owned()), None,
                                val.trim_matches('"').as_bytes().to_owned())
                        } else if key.eq_ignore_ascii_case("filename*") {
                            let extended_value = try!(header::parse_extended_value(val));
                            DispositionParam::Filename(extended_value.charset, extended_value.language_tag, extended_value.value)
                        } else {
                            DispositionParam::Ext(key.to_owned(), val.trim_matches('"').to_owned())
                        }
                    );
                }

                Ok(cd)
            })
        }
    }

    impl IntoHeaderValue for ContentDisposition {
        type Error = header::InvalidHeaderValueBytes;

        fn try_into(self) -> Result<header::HeaderValue, Self::Error> {
            let mut writer = Writer::new();
            let _ = write!(&mut writer, "{}", self);
            header::HeaderValue::from_shared(writer.take())
        }
    }

    impl Header for ContentDisposition {
        fn name() -> header::HeaderName {
            header::CONTENT_DISPOSITION
        }

        fn parse<T: ::HttpMessage>(msg: &T) -> Result<Self, ::error::ParseError> {
            if let Some(h) = msg.headers().get(Self::name()) {
                Self::from_raw(&h)
            } else {
                Err(::error::ParseError::Header)
            }
        }
    }

    impl fmt::Display for ContentDisposition {
        fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
            match self.disposition {
                DispositionType::Inline => try!(write!(f, "inline")),
                DispositionType::Attachment => try!(write!(f, "attachment")),
                DispositionType::Ext(ref s) => try!(write!(f, "{}", s)),
            }
            for param in &self.parameters {
                match *param {
                    DispositionParam::Filename(ref charset, ref opt_lang, ref bytes) => {
                        let mut use_simple_format: bool = false;
                        if opt_lang.is_none() {
                            if let Charset::Ext(ref ext) = *charset {
                                if ext.eq_ignore_ascii_case("utf-8") {
                                    use_simple_format = true;
                                }
                            }
                        }
                        if use_simple_format {
                            use std::str;
                            try!(write!(f, "; filename=\"{}\"",
                                        match str::from_utf8(bytes) {
                                            Ok(s) => s,
                                            Err(_) => return Err(fmt::Error),
                                        }));
                        } else {
                            try!(write!(f, "; filename*={}'", charset));
                            if let Some(ref lang) = *opt_lang {
                                try!(write!(f, "{}", lang));
                            };
                            try!(write!(f, "'"));
                            try!(header::http_percent_encode(f, bytes))
                        }
                    },
                    DispositionParam::Ext(ref k, ref v) => try!(write!(f, "; {}=\"{}\"", k, v)),
                }
            }
            Ok(())
        }
    }

    #[cfg(test)]
    mod tests {
        use super::{ContentDisposition,DispositionType,DispositionParam};
        use header::HeaderValue;
        use header::shared::Charset;
        #[test]
        fn test_from_raw() {
            assert!(ContentDisposition::from_raw(&HeaderValue::from_static("")).is_err());

            let a = HeaderValue::from_static("form-data; dummy=3; name=upload; filename=\"sample.png\"");
            let a: ContentDisposition = ContentDisposition::from_raw(&a).unwrap();
            let b = ContentDisposition {
                disposition: DispositionType::Ext("form-data".to_owned()),
                parameters: vec![
                    DispositionParam::Ext("dummy".to_owned(), "3".to_owned()),
                    DispositionParam::Ext("name".to_owned(), "upload".to_owned()),
                    DispositionParam::Filename(
                        Charset::Ext("UTF-8".to_owned()),
                        None,
                        "sample.png".bytes().collect()) ]
            };
            assert_eq!(a, b);

            let a = HeaderValue::from_static("attachment; filename=\"image.jpg\"");
            let a: ContentDisposition = ContentDisposition::from_raw(&a).unwrap();
            let b = ContentDisposition {
                disposition: DispositionType::Attachment,
                parameters: vec![
                    DispositionParam::Filename(
                        Charset::Ext("UTF-8".to_owned()),
                        None,
                        "image.jpg".bytes().collect()) ]
            };
            assert_eq!(a, b);

            let a = HeaderValue::from_static("attachment; filename*=UTF-8''%c2%a3%20and%20%e2%82%ac%20rates");
            let a: ContentDisposition = ContentDisposition::from_raw(&a).unwrap();
            let b = ContentDisposition {
                disposition: DispositionType::Attachment,
                parameters: vec![
                    DispositionParam::Filename(
                        Charset::Ext("UTF-8".to_owned()),
                        None,
                        vec![0xc2, 0xa3, 0x20, b'a', b'n', b'd', 0x20,
                             0xe2, 0x82, 0xac, 0x20, b'r', b'a', b't', b'e', b's']) ]
            };
            assert_eq!(a, b);
        }

        #[test]
        fn test_display() {
            let as_string = "attachment; filename*=UTF-8'en'%C2%A3%20and%20%E2%82%AC%20rates";
            let a = HeaderValue::from_static(as_string);
            let a: ContentDisposition = ContentDisposition::from_raw(&a).unwrap();
            let display_rendered = format!("{}",a);
            assert_eq!(as_string, display_rendered);

            let a = HeaderValue::from_static("attachment; filename*=UTF-8''black%20and%20white.csv");
            let a: ContentDisposition = ContentDisposition::from_raw(&a).unwrap();
            let display_rendered = format!("{}",a);
            assert_eq!("attachment; filename=\"black and white.csv\"".to_owned(), display_rendered);

            let a = HeaderValue::from_static("attachment; filename=colourful.csv");
            let a: ContentDisposition = ContentDisposition::from_raw(&a).unwrap();
            let display_rendered = format!("{}",a);
            assert_eq!("attachment; filename=\"colourful.csv\"".to_owned(), display_rendered);
        }
    }

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