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    // Copyright 2016 The rust-url developers.
    //
    // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
    // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
    // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
    // option. This file may not be copied, modified, or distributed
    // except according to those terms.

    //! Getters and setters for URL components implemented per https://url.spec.whatwg.org/#api
    //!
    //! Unless you need to be interoperable with web browsers,
    //! you probably want to use `Url` method instead.

    use crate::parser::{default_port, Context, Input, Parser, SchemeType};
    use crate::{Host, ParseError, Position, Url};

    /// https://url.spec.whatwg.org/#dom-url-domaintoascii
    pub fn domain_to_ascii(domain: &str) -> String {
        match Host::parse(domain) {
            Ok(Host::Domain(domain)) => domain,
            _ => String::new(),
        }
    }

    /// https://url.spec.whatwg.org/#dom-url-domaintounicode
    pub fn domain_to_unicode(domain: &str) -> String {
        match Host::parse(domain) {
            Ok(Host::Domain(ref domain)) => {
                let (unicode, _errors) = idna::domain_to_unicode(domain);
                unicode
            }
            _ => String::new(),
        }
    }

    /// Getter for https://url.spec.whatwg.org/#dom-url-href
    pub fn href(url: &Url) -> &str {
        url.as_str()
    }

    /// Setter for https://url.spec.whatwg.org/#dom-url-href
    pub fn set_href(url: &mut Url, value: &str) -> Result<(), ParseError> {
        *url = Url::parse(value)?;
        Ok(())
    }

    /// Getter for https://url.spec.whatwg.org/#dom-url-origin
    pub fn origin(url: &Url) -> String {
        url.origin().ascii_serialization()
    }

    /// Getter for https://url.spec.whatwg.org/#dom-url-protocol
    #[inline]
    pub fn protocol(url: &Url) -> &str {
        &url.as_str()[..url.scheme().len() + ":".len()]
    }

    /// Setter for https://url.spec.whatwg.org/#dom-url-protocol
    #[allow(clippy::clippy::result_unit_err)]
    pub fn set_protocol(url: &mut Url, mut new_protocol: &str) -> Result<(), ()> {
        // The scheme state in the spec ignores everything after the first `:`,
        // but `set_scheme` errors if there is more.
        if let Some(position) = new_protocol.find(':') {
            new_protocol = &new_protocol[..position];
        }
        url.set_scheme(new_protocol)
    }

    /// Getter for https://url.spec.whatwg.org/#dom-url-username
    #[inline]
    pub fn username(url: &Url) -> &str {
        url.username()
    }

    /// Setter for https://url.spec.whatwg.org/#dom-url-username
    #[allow(clippy::clippy::result_unit_err)]
    pub fn set_username(url: &mut Url, new_username: &str) -> Result<(), ()> {
        url.set_username(new_username)
    }

    /// Getter for https://url.spec.whatwg.org/#dom-url-password
    #[inline]
    pub fn password(url: &Url) -> &str {
        url.password().unwrap_or("")
    }

    /// Setter for https://url.spec.whatwg.org/#dom-url-password
    #[allow(clippy::clippy::result_unit_err)]
    pub fn set_password(url: &mut Url, new_password: &str) -> Result<(), ()> {
        url.set_password(if new_password.is_empty() {
            None
        } else {
            Some(new_password)
        })
    }

    /// Getter for https://url.spec.whatwg.org/#dom-url-host
    #[inline]
    pub fn host(url: &Url) -> &str {
        &url[Position::BeforeHost..Position::AfterPort]
    }

    /// Setter for https://url.spec.whatwg.org/#dom-url-host
    #[allow(clippy::clippy::result_unit_err)]
    pub fn set_host(url: &mut Url, new_host: &str) -> Result<(), ()> {
        // If context object’s url’s cannot-be-a-base-URL flag is set, then return.
        if url.cannot_be_a_base() {
            return Err(());
        }
        // Host parsing rules are strict,
        // We don't want to trim the input
        let input = Input::no_trim(new_host);
        let host;
        let opt_port;
        {
            let scheme = url.scheme();
            let scheme_type = SchemeType::from(scheme);
            if scheme_type == SchemeType::File && new_host.is_empty() {
                url.set_host_internal(Host::Domain(String::new()), None);
                return Ok(());
            }

            if let Ok((h, remaining)) = Parser::parse_host(input, scheme_type) {
                host = h;
                opt_port = if let Some(remaining) = remaining.split_prefix(':') {
                    if remaining.is_empty() {
                        None
                    } else {
                        Parser::parse_port(remaining, || default_port(scheme), Context::Setter)
                            .ok()
                            .map(|(port, _remaining)| port)
                    }
                } else {
                    None
                };
            } else {
                return Err(());
            }
        }
        // Make sure we won't set an empty host to a url with a username or a port
        if host == Host::Domain("".to_string()) {
            if !username(&url).is_empty() {
                return Err(());
            } else if let Some(Some(_)) = opt_port {
                return Err(());
            } else if url.port().is_some() {
                return Err(());
            }
        }
        url.set_host_internal(host, opt_port);
        Ok(())
    }

    /// Getter for https://url.spec.whatwg.org/#dom-url-hostname
    #[inline]
    pub fn hostname(url: &Url) -> &str {
        url.host_str().unwrap_or("")
    }

    /// Setter for https://url.spec.whatwg.org/#dom-url-hostname
    #[allow(clippy::clippy::result_unit_err)]
    pub fn set_hostname(url: &mut Url, new_hostname: &str) -> Result<(), ()> {
        if url.cannot_be_a_base() {
            return Err(());
        }
        // Host parsing rules are strict we don't want to trim the input
        let input = Input::no_trim(new_hostname);
        let scheme_type = SchemeType::from(url.scheme());
        if scheme_type == SchemeType::File && new_hostname.is_empty() {
            url.set_host_internal(Host::Domain(String::new()), None);
            return Ok(());
        }

        if let Ok((host, _remaining)) = Parser::parse_host(input, scheme_type) {
            if let Host::Domain(h) = &host {
                if h.is_empty() {
                    // Empty host on special not file url
                    if SchemeType::from(url.scheme()) == SchemeType::SpecialNotFile
                        // Port with an empty host
                        ||!port(&url).is_empty()
                        // Empty host that includes credentials
                        || !url.username().is_empty()
                        || !url.password().unwrap_or(&"").is_empty()
                    {
                        return Err(());
                    }
                }
            }
            url.set_host_internal(host, None);
            Ok(())
        } else {
            Err(())
        }
    }

    /// Getter for https://url.spec.whatwg.org/#dom-url-port
    #[inline]
    pub fn port(url: &Url) -> &str {
        &url[Position::BeforePort..Position::AfterPort]
    }

    /// Setter for https://url.spec.whatwg.org/#dom-url-port
    #[allow(clippy::clippy::result_unit_err)]
    pub fn set_port(url: &mut Url, new_port: &str) -> Result<(), ()> {
        let result;
        {
            // has_host implies !cannot_be_a_base
            let scheme = url.scheme();
            if !url.has_host() || url.host() == Some(Host::Domain("")) || scheme == "file" {
                return Err(());
            }
            result = Parser::parse_port(
                Input::new(new_port),
                || default_port(scheme),
                Context::Setter,
            )
        }
        if let Ok((new_port, _remaining)) = result {
            url.set_port_internal(new_port);
            Ok(())
        } else {
            Err(())
        }
    }

    /// Getter for https://url.spec.whatwg.org/#dom-url-pathname
    #[inline]
    pub fn pathname(url: &Url) -> &str {
        url.path()
    }

    /// Setter for https://url.spec.whatwg.org/#dom-url-pathname
    pub fn set_pathname(url: &mut Url, new_pathname: &str) {
        if url.cannot_be_a_base() {
            return;
        }
        if new_pathname.starts_with('/')
            || (SchemeType::from(url.scheme()).is_special()
                // \ is a segment delimiter for 'special' URLs"
                && new_pathname.starts_with('\\'))
        {
            url.set_path(new_pathname)
        } else {
            let mut path_to_set = String::from("/");
            path_to_set.push_str(new_pathname);
            url.set_path(&path_to_set)
        }
    }

    /// Getter for https://url.spec.whatwg.org/#dom-url-search
    pub fn search(url: &Url) -> &str {
        trim(&url[Position::AfterPath..Position::AfterQuery])
    }

    /// Setter for https://url.spec.whatwg.org/#dom-url-search
    pub fn set_search(url: &mut Url, new_search: &str) {
        url.set_query(match new_search {
            "" => None,
            _ if new_search.starts_with('?') => Some(&new_search[1..]),
            _ => Some(new_search),
        })
    }

    /// Getter for https://url.spec.whatwg.org/#dom-url-hash
    pub fn hash(url: &Url) -> &str {
        trim(&url[Position::AfterQuery..])
    }

    /// Setter for https://url.spec.whatwg.org/#dom-url-hash
    pub fn set_hash(url: &mut Url, new_hash: &str) {
        url.set_fragment(match new_hash {
            // If the given value is the empty string,
            // then set context object’s url’s fragment to null and return.
            "" => None,
            // Let input be the given value with a single leading U+0023 (#) removed, if any.
            _ if new_hash.starts_with('#') => Some(&new_hash[1..]),
            _ => Some(new_hash),
        })
    }

    fn trim(s: &str) -> &str {
        if s.len() == 1 {
            ""
        } else {
            s
        }
    }