use std::str;
use std::sync::Arc;

use peanuts::{Reader, Writer};
use rsasl::prelude::SASLConfig;
use tokio::io::{AsyncRead, AsyncWrite, AsyncWriteExt, BufReader, ReadHalf, WriteHalf};
use tracing::{debug, info, trace};

use crate::connection::{Tls, Unencrypted};
use crate::error::Error;
use crate::stanza::stream::Stream;
use crate::stanza::XML_VERSION;
use crate::Result;
use crate::JID;

pub struct Jabber<S>
where
    S: AsyncRead + AsyncWrite + Unpin,
{
    reader: Reader<ReadHalf<S>>,
    writer: Writer<WriteHalf<S>>,
    jid: Option<JID>,
    auth: Option<Arc<SASLConfig>>,
    server: String,
}

impl<S> Jabber<S>
where
    S: AsyncRead + AsyncWrite + Unpin,
{
    pub fn new(
        reader: ReadHalf<S>,
        writer: WriteHalf<S>,
        jid: Option<JID>,
        auth: Option<Arc<SASLConfig>>,
        server: String,
    ) -> Self {
        let reader = Reader::new(reader);
        let writer = Writer::new(writer);
        Self {
            reader,
            writer,
            jid,
            auth,
            server,
        }
    }
}

impl<S> Jabber<S>
where
    S: AsyncRead + AsyncWrite + Unpin + Send,
{
    // pub async fn negotiate(self) -> Result<Jabber<S>> {}

    pub async fn start_stream(&mut self) -> Result<()> {
        // client to server

        // declaration
        self.writer.write_declaration(XML_VERSION).await?;

        // opening stream element
        let server = self.server.clone().try_into()?;
        let stream = Stream::new_client(None, server, None, "en".to_string());
        // TODO: nicer function to serialize to xml writer
        self.writer.write_start(&stream).await?;

        // server to client

        // may or may not send a declaration
        let decl = self.reader.read_prolog().await?;

        // receive stream element and validate
        let stream: Stream = self.reader.read_start().await?;
        if let Some(from) = stream.from {
            self.server = from.to_string()
        }

        Ok(())
    }
}

// pub async fn get_features(&mut self) -> Result<Vec<StreamFeature>> {
//     Element::read(&mut self.reader).await?.try_into()
// }

impl Jabber<Unencrypted> {
    pub async fn starttls(&mut self) -> Result<Jabber<Tls>> {
        todo!()
    }
    //     let mut starttls_element = BytesStart::new("starttls");
    //     starttls_element.push_attribute(("xmlns", "urn:ietf:params:xml:ns:xmpp-tls"));
    //     self.writer
    //         .write_event_async(Event::Empty(starttls_element))
    //         .await
    //         .unwrap();
    //     let mut buf = Vec::new();
    //     match self.reader.read_event_into_async(&mut buf).await.unwrap() {
    //         Event::Empty(e) => match e.name() {
    //             QName(b"proceed") => {
    //                 let connector = TlsConnector::new().unwrap();
    //                 let stream = self
    //                     .reader
    //                     .into_inner()
    //                     .into_inner()
    //                     .unsplit(self.writer.into_inner());
    //                 if let Ok(tlsstream) = tokio_native_tls::TlsConnector::from(connector)
    //                     .connect(&self.jabber.server, stream)
    //                     .await
    //                 {
    //                     let (read, write) = tokio::io::split(tlsstream);
    //                     let reader = Reader::from_reader(BufReader::new(read));
    //                     let writer = Writer::new(write);
    //                     let mut client =
    //                         super::encrypted::JabberClient::new(reader, writer, self.jabber);
    //                     client.start_stream().await?;
    //                     return Ok(client);
    //                 }
    //             }
    //             QName(_) => return Err(JabberError::TlsNegotiation),
    //         },
    //         _ => return Err(JabberError::TlsNegotiation),
    //     }
    //     Err(JabberError::TlsNegotiation)
    // }
}

impl std::fmt::Debug for Jabber<Tls> {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.debug_struct("Jabber")
            .field("connection", &"tls")
            .field("jid", &self.jid)
            .field("auth", &self.auth)
            .field("server", &self.server)
            .finish()
    }
}

impl std::fmt::Debug for Jabber<Unencrypted> {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.debug_struct("Jabber")
            .field("connection", &"unencrypted")
            .field("jid", &self.jid)
            .field("auth", &self.auth)
            .field("server", &self.server)
            .finish()
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::connection::Connection;
    use test_log::test;

    #[test(tokio::test)]
    async fn start_stream() {
        let connection = Connection::connect("blos.sm").await.unwrap();
        match connection {
            Connection::Encrypted(mut c) => c.start_stream().await.unwrap(),
            Connection::Unencrypted(mut c) => c.start_stream().await.unwrap(),
        }
    }
}