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use std::fmt;
use std::io;
use std::result;

use crate::tls_api;
use crate::tls_api::{Error, Result};

pub struct TlsConnectorBuilder;
pub struct TlsConnector;

// pub struct TlsAcceptorBuilder;
// pub struct TlsAcceptor;

/// Make use of the TLS implementation's crypto hashing functions.
/// Not picking any TLS implementation as a feature means hash will not work also
/// and will always return an empty vec.
pub fn hash(_algo: tls_api::HashType, _data: &[u8]) -> Vec<u8> {
    Vec::new()
}

impl tls_api::TlsConnectorBuilder for TlsConnectorBuilder {
    type Connector = TlsConnector;

    type Underlying = ();

    // fn underlying_mut(&mut self) -> &mut native_tls::TlsConnectorBuilder {
    //     &mut self.0
    // }

    fn add_der_certificate(&mut self, _cert: &[u8]) -> Result<&mut Self> {
        Err(Error::Other("No TLS"))
    }

    fn add_pem_certificate(&mut self, _cert: &[u8]) -> Result<&mut Self> {
        Err(Error::Other("No TLS"))
    }

    fn build(self) -> Result<TlsConnector> {
        Err(Error::Other("No TLS"))
    }

    fn danger_accept_invalid_certs(&mut self) -> Result<&mut Self> {
        Err(Error::Other("No TLS"))
    }
}

impl tls_api::TlsConnector for TlsConnector {
    type Builder = TlsConnectorBuilder;

    fn builder() -> Result<TlsConnectorBuilder> {
        Err(Error::Other("No TLS"))
    }

    fn connect<S>(
        &self,
        _domain: &str,
        _stream: S,
    ) -> result::Result<tls_api::TlsStream<S>, tls_api::HandshakeError<S>>
    where
        S: io::Read + io::Write + fmt::Debug + Send + Sync + 'static,
    {
        Err(tls_api::HandshakeError::Failure(Error::Other("No TLS")))
    }

    // fn danger_connect_without_providing_domain_for_certificate_verification_and_server_name_indication<
    //     S,
    // >(
    //     &self,
    //     _stream: S,
    // ) -> result::Result<tls_api::TlsStream<S>, tls_api::HandshakeError<S>>
    // where
    //     S: io::Read + io::Write + fmt::Debug + Send + Sync + 'static,
    // {
    //     Err(tls_api::HandshakeError::Failure(Error::Other("No TLS")))
    // }
}

// TlsAcceptor and TlsAcceptorBuilder

// impl TlsAcceptorBuilder {
// pub fn from_pkcs12(_pkcs12: &[u8], _password: &str) -> Result<TlsAcceptorBuilder> {
//     Err(Error::Other("No TLS"))
// }
// }

// impl tls_api::TlsAcceptorBuilder for TlsAcceptorBuilder {
//     type Acceptor = TlsAcceptor;

//     type Underlying = ();

//     fn supports_alpn() -> bool {
//         false
//     }

//     fn set_alpn_protocols(&mut self, _protocols: &[&str]) -> Result<()> {
//         Err(Error::Other("ALPN is not implemented in rust-native-tls"))
//     }

//     // fn underlying_mut(&mut self) -> &mut native_tls::TlsAcceptorBuilder {
//     //     &mut self.0
//     // }

//     fn build(self) -> Result<TlsAcceptor> {
//         Err(Error::Other("No TLS"))
//     }
// }

// impl tls_api::TlsAcceptor for TlsAcceptor {
//     type Builder = TlsAcceptorBuilder;

//     fn accept<S>(
//         &self,
//         _stream: S,
//     ) -> result::Result<tls_api::TlsStream<S>, tls_api::HandshakeError<S>>
//     where
//         S: io::Read + io::Write + fmt::Debug + Send + Sync + 'static,
//     {
//         Err(tls_api::HandshakeError::Failure(Error::Other("No TLS")))
//     }
// }