use crate::{
    config,
    config::tree::{keys, Http, Key, Section},
};

impl Http {
    /// The `http.sslVersion` key.
    pub const SSL_VERSION: SslVersion = SslVersion::new_ssl_version("sslVersion", &config::Tree::HTTP)
        .with_environment_override("GIT_SSL_VERSION")
        .with_deviation(
            "accepts the new 'default' value which means to use the curl default just like the empty string does",
        );
    /// The `http.proxy` key.
    pub const PROXY: keys::String =
        keys::String::new_string("proxy", &config::Tree::HTTP).with_deviation("fails on strings with illformed UTF-8");
    /// The `http.proxyAuthMethod` key.
    pub const PROXY_AUTH_METHOD: ProxyAuthMethod =
        ProxyAuthMethod::new_proxy_auth_method("proxyAuthMethod", &config::Tree::HTTP)
            .with_deviation("implemented like git, but never actually tried");
    /// The `http.version` key.
    pub const VERSION: Version = Version::new_with_validate("version", &config::Tree::HTTP, validate::Version)
        .with_deviation("fails on illformed UTF-8");
    /// The `http.userAgent` key.
    pub const USER_AGENT: keys::String =
        keys::String::new_string("userAgent", &config::Tree::HTTP).with_deviation("fails on illformed UTF-8");
    /// The `http.extraHeader` key.
    pub const EXTRA_HEADER: ExtraHeader =
        ExtraHeader::new_with_validate("extraHeader", &config::Tree::HTTP, validate::ExtraHeader)
            .with_deviation("fails on illformed UTF-8, without leniency");
    /// The `http.followRedirects` key.
    pub const FOLLOW_REDIRECTS: FollowRedirects =
        FollowRedirects::new_with_validate("followRedirects", &config::Tree::HTTP, validate::FollowRedirects);
    /// The `http.lowSpeedTime` key.
    pub const LOW_SPEED_TIME: keys::UnsignedInteger =
        keys::UnsignedInteger::new_unsigned_integer("lowSpeedTime", &config::Tree::HTTP)
            .with_deviation("fails on negative values");
    /// The `http.lowSpeedLimit` key.
    pub const LOW_SPEED_LIMIT: keys::UnsignedInteger =
        keys::UnsignedInteger::new_unsigned_integer("lowSpeedLimit", &config::Tree::HTTP)
            .with_deviation("fails on negative values");
    /// The `http.schannelUseSSLCAInfo` key.
    pub const SCHANNEL_USE_SSL_CA_INFO: keys::Boolean =
        keys::Boolean::new_boolean("schannelUseSSLCAInfo", &config::Tree::HTTP)
            .with_deviation("only used as switch internally to turn off using the sslCAInfo, unconditionally. If unset, it has no effect, whereas in `git` it defaults to false.");
    /// The `http.sslCAInfo` key.
    pub const SSL_CA_INFO: keys::Path =
        keys::Path::new_path("sslCAInfo", &config::Tree::HTTP).with_environment_override("GIT_SSL_CAINFO");
    /// The `http.schannelCheckRevoke` key.
    pub const SCHANNEL_CHECK_REVOKE: keys::Boolean =
        keys::Boolean::new_boolean("schannelCheckRevoke", &config::Tree::HTTP);
}

impl Section for Http {
    fn name(&self) -> &str {
        "http"
    }

    fn keys(&self) -> &[&dyn Key] {
        &[
            &Self::SSL_VERSION,
            &Self::PROXY,
            &Self::PROXY_AUTH_METHOD,
            &Self::VERSION,
            &Self::USER_AGENT,
            &Self::EXTRA_HEADER,
            &Self::FOLLOW_REDIRECTS,
            &Self::LOW_SPEED_TIME,
            &Self::LOW_SPEED_LIMIT,
            &Self::SCHANNEL_USE_SSL_CA_INFO,
            &Self::SSL_CA_INFO,
            &Self::SCHANNEL_CHECK_REVOKE,
        ]
    }
}

/// The `http.followRedirects` key.
pub type FollowRedirects = keys::Any<validate::FollowRedirects>;

/// The `http.extraHeader` key.
pub type ExtraHeader = keys::Any<validate::ExtraHeader>;

/// The `http.sslVersion` key, as well as others of the same type.
pub type SslVersion = keys::Any<validate::SslVersion>;

/// The `http.proxyAuthMethod` key, as well as others of the same type.
pub type ProxyAuthMethod = keys::Any<validate::ProxyAuthMethod>;

/// The `http.version` key.
pub type Version = keys::Any<validate::Version>;

mod key_impls {
    use crate::config::tree::{
        http::{ProxyAuthMethod, SslVersion},
        keys, Section,
    };

    impl SslVersion {
        pub const fn new_ssl_version(name: &'static str, section: &'static dyn Section) -> Self {
            keys::Any::new_with_validate(name, section, super::validate::SslVersion)
        }
    }

    impl ProxyAuthMethod {
        pub const fn new_proxy_auth_method(name: &'static str, section: &'static dyn Section) -> Self {
            keys::Any::new_with_validate(name, section, super::validate::ProxyAuthMethod)
        }
    }

    #[cfg(any(
        feature = "blocking-http-transport-reqwest",
        feature = "blocking-http-transport-curl"
    ))]
    impl crate::config::tree::http::FollowRedirects {
        /// Convert `value` into the redirect specification, or query the same value as `boolean`
        /// for additional possible input values.
        ///
        /// Note that `boolean` only queries the underlying key as boolean, which is a necessity to handle
        /// empty booleans correctly, that is those without a value separator.
        pub fn try_into_follow_redirects(
            &'static self,
            value: std::borrow::Cow<'_, crate::bstr::BStr>,
            boolean: impl FnOnce() -> Result<Option<bool>, gix_config::value::Error>,
        ) -> Result<
            crate::protocol::transport::client::http::options::FollowRedirects,
            crate::config::key::GenericErrorWithValue,
        > {
            use crate::{bstr::ByteSlice, protocol::transport::client::http::options::FollowRedirects};
            Ok(if value.as_ref().as_bytes() == b"initial" {
                FollowRedirects::Initial
            } else if let Some(value) = boolean().map_err(|err| {
                crate::config::key::GenericErrorWithValue::from_value(self, value.into_owned()).with_source(err)
            })? {
                if value {
                    FollowRedirects::All
                } else {
                    FollowRedirects::None
                }
            } else {
                FollowRedirects::Initial
            })
        }
    }

    impl super::ExtraHeader {
        /// Convert a list of values into extra-headers, while failing entirely on illformed UTF-8.
        pub fn try_into_extra_header(
            &'static self,
            values: Vec<std::borrow::Cow<'_, crate::bstr::BStr>>,
        ) -> Result<Vec<String>, crate::config::string::Error> {
            let mut out = Vec::with_capacity(values.len());
            for value in values {
                if value.is_empty() {
                    out.clear();
                } else {
                    out.push(self.try_into_string(value)?);
                }
            }
            Ok(out)
        }
    }

    #[cfg(any(
        feature = "blocking-http-transport-reqwest",
        feature = "blocking-http-transport-curl"
    ))]
    impl super::Version {
        pub fn try_into_http_version(
            &'static self,
            value: std::borrow::Cow<'_, crate::bstr::BStr>,
        ) -> Result<
            gix_protocol::transport::client::http::options::HttpVersion,
            crate::config::key::GenericErrorWithValue,
        > {
            use gix_protocol::transport::client::http::options::HttpVersion;

            use crate::bstr::ByteSlice;
            Ok(match value.as_ref().as_bytes() {
                b"HTTP/1.1" => HttpVersion::V1_1,
                b"HTTP/2" => HttpVersion::V2,
                _ => {
                    return Err(crate::config::key::GenericErrorWithValue::from_value(
                        self,
                        value.into_owned(),
                    ))
                }
            })
        }
    }

    #[cfg(any(
        feature = "blocking-http-transport-reqwest",
        feature = "blocking-http-transport-curl"
    ))]
    impl ProxyAuthMethod {
        pub fn try_into_proxy_auth_method(
            &'static self,
            value: std::borrow::Cow<'_, crate::bstr::BStr>,
        ) -> Result<
            gix_protocol::transport::client::http::options::ProxyAuthMethod,
            crate::config::key::GenericErrorWithValue,
        > {
            use gix_protocol::transport::client::http::options::ProxyAuthMethod;

            use crate::bstr::ByteSlice;
            Ok(match value.as_ref().as_bytes() {
                b"anyauth" => ProxyAuthMethod::AnyAuth,
                b"basic" => ProxyAuthMethod::Basic,
                b"digest" => ProxyAuthMethod::Digest,
                b"negotiate" => ProxyAuthMethod::Negotiate,
                b"ntlm" => ProxyAuthMethod::Ntlm,
                _ => {
                    return Err(crate::config::key::GenericErrorWithValue::from_value(
                        self,
                        value.into_owned(),
                    ))
                }
            })
        }
    }

    #[cfg(any(
        feature = "blocking-http-transport-reqwest",
        feature = "blocking-http-transport-curl"
    ))]
    impl SslVersion {
        pub fn try_into_ssl_version(
            &'static self,
            value: std::borrow::Cow<'_, crate::bstr::BStr>,
        ) -> Result<gix_protocol::transport::client::http::options::SslVersion, crate::config::ssl_version::Error>
        {
            use gix_protocol::transport::client::http::options::SslVersion::*;

            use crate::bstr::ByteSlice;
            Ok(match value.as_ref().as_bytes() {
                b"default" | b"" => Default,
                b"tlsv1" => TlsV1,
                b"sslv2" => SslV2,
                b"sslv3" => SslV3,
                b"tlsv1.0" => TlsV1_0,
                b"tlsv1.1" => TlsV1_1,
                b"tlsv1.2" => TlsV1_2,
                b"tlsv1.3" => TlsV1_3,
                _ => return Err(crate::config::ssl_version::Error::from_value(self, value.into_owned())),
            })
        }
    }
}

pub mod validate {
    use std::error::Error;

    use crate::{
        bstr::{BStr, ByteSlice},
        config::tree::keys::Validate,
    };

    pub struct SslVersion;
    impl Validate for SslVersion {
        fn validate(&self, _value: &BStr) -> Result<(), Box<dyn Error + Send + Sync + 'static>> {
            #[cfg(any(
                feature = "blocking-http-transport-reqwest",
                feature = "blocking-http-transport-curl"
            ))]
            super::Http::SSL_VERSION.try_into_ssl_version(std::borrow::Cow::Borrowed(_value))?;

            Ok(())
        }
    }

    pub struct ProxyAuthMethod;
    impl Validate for ProxyAuthMethod {
        fn validate(&self, _value: &BStr) -> Result<(), Box<dyn Error + Send + Sync + 'static>> {
            #[cfg(any(
                feature = "blocking-http-transport-reqwest",
                feature = "blocking-http-transport-curl"
            ))]
            super::Http::PROXY_AUTH_METHOD.try_into_proxy_auth_method(std::borrow::Cow::Borrowed(_value))?;

            Ok(())
        }
    }

    pub struct Version;
    impl Validate for Version {
        fn validate(&self, _value: &BStr) -> Result<(), Box<dyn Error + Send + Sync + 'static>> {
            #[cfg(any(
                feature = "blocking-http-transport-reqwest",
                feature = "blocking-http-transport-curl"
            ))]
            super::Http::VERSION.try_into_http_version(std::borrow::Cow::Borrowed(_value))?;

            Ok(())
        }
    }

    pub struct ExtraHeader;
    impl Validate for ExtraHeader {
        fn validate(&self, value: &BStr) -> Result<(), Box<dyn Error + Send + Sync + 'static>> {
            value.to_str()?;
            Ok(())
        }
    }

    pub struct FollowRedirects;
    impl Validate for FollowRedirects {
        fn validate(&self, _value: &BStr) -> Result<(), Box<dyn Error + Send + Sync + 'static>> {
            #[cfg(any(
                feature = "blocking-http-transport-reqwest",
                feature = "blocking-http-transport-curl"
            ))]
            super::Http::FOLLOW_REDIRECTS.try_into_follow_redirects(std::borrow::Cow::Borrowed(_value), || {
                gix_config::Boolean::try_from(_value).map(|b| Some(b.0))
            })?;
            Ok(())
        }
    }
}
