use argparse::{ArgumentParser, Store};
use dirs::config_local_dir;
use eyre::Result;
use helpers::State;
use pgp::{Deserializable, SignedPublicKey, SignedSecretKey};
use std::collections::HashMap;
use std::fs;
use std::sync::mpsc;
use std::thread;
use std::time::Duration;
use toml::Table;

mod client_handler;
mod encryption;
mod helpers;
mod listener_server;
mod server_handler;
mod writer_client;

fn main() -> Result<()> {
    let config_file = config_local_dir()
        .expect("Couldn't get config directory")
        .join("e2e-irc/config.toml");

    if !config_file.exists() {
        panic!("Create a config file at {}", config_file.display());
    }

    let parsed_config = String::from_utf8_lossy(&fs::read(config_file)?).parse::<Table>()?;

    let public_key_location = parsed_config
        .get("public_key")
        .expect("Coudln't get public_key. Try creating it in the config")
        .as_str()
        .expect("Couldn't convert public_key to str");
    let secret_key_location = parsed_config
        .get("secret_key")
        .expect("Coudln't get secret_key. Try creating it in the config")
        .as_str()
        .expect("Couldn't convert secret_key to str");

    let default_password = toml::Value::String(String::new());

    let passwd = parsed_config
        .get("passwd")
        .unwrap_or(&default_password)
        .as_str()
        .expect("Coudln't convert passwd to str");

    let mut server = "irc.vanten-s.com".to_string();
    let mut port = "6666".to_string();
    let mut server_port = "6697".to_string();

    {
        let mut ap = ArgumentParser::new();
        ap.set_description("Encrypted IRC Bouncer");
        ap.refer(&mut server)
            .add_argument(
                "server",
                Store,
                "The Address Of The Server The Bouncer Connects To",
            )
            .required();
        ap.refer(&mut port)
            .add_option(&["-p", "--port"], Store, "The Port The Bouncer Binds To");
        ap.refer(&mut server_port).add_option(
            &["--sp", "--server-port"],
            Store,
            "The TLS Enabled Port Of The Server",
        );
        ap.parse_args_or_exit();
    }

    let public_key = fs::read(public_key_location)?;
    let secret_key = SignedSecretKey::from_bytes(fs::read(secret_key_location)?.as_slice())?;

    let (listener_channel_send_tx, listener_channel_rx) = mpsc::channel();
    let (listener_channel_tx, listener_channel_recv_rx) = mpsc::channel();

    let (writer_channel_tx, writer_channel_send_rx) = mpsc::channel();
    let (writer_channel_recv_tx, writer_channel_rx) = mpsc::channel();

    let tmp_port = port.clone();
    thread::spawn(move || {
        listener_server::listen_to_client(
            listener_channel_send_tx,
            listener_channel_recv_rx,
            tmp_port,
        )
    });
    let tmp_port = server_port.clone();
    let tmp_server = server.clone();
    thread::spawn(move || {
        writer_client::write_to_server(
            &tmp_server,
            &tmp_port,
            writer_channel_send_rx,
            writer_channel_recv_tx,
        )
    });

    let mut keys: HashMap<String, SignedPublicKey> = HashMap::new();
    let mut state = State::new();

    loop {
        match listener_channel_rx.try_recv() {
            Ok(message) => {
                let _ = client_handler::handle_message_from_client(
                    &message,
                    &public_key,
                    &server,
                    &mut keys,
                    &writer_channel_tx,
                    &writer_channel_rx,
                    &listener_channel_tx,
                    &listener_channel_rx,
                    &mut state,
                );
            }
            Err(error) => match error {
                mpsc::TryRecvError::Empty => {}
                mpsc::TryRecvError::Disconnected => panic!("listener_channel_rx disconnected"),
            },
        };

        match writer_channel_rx.try_recv() {
            Ok(message) => {
                let _ = server_handler::handle_message_from_server(
                    &message,
                    &public_key,
                    &secret_key,
                    &server,
                    passwd,
                    &mut keys,
                    &writer_channel_tx,
                    &writer_channel_rx,
                    &listener_channel_tx,
                    &listener_channel_rx,
                    &state,
                );
            }
            Err(error) => match error {
                mpsc::TryRecvError::Empty => {}
                mpsc::TryRecvError::Disconnected => panic!("writer_channel_rx disconnected"),
            },
        };

        thread::sleep(Duration::from_millis(1));
    }
}