// Copyright 2018 Yuya Nishihara <yuya@tcha.org>

//

// This software may be used and distributed according to the terms of the

// GNU General Public License version 2 or any later version.

extern crate chg;

extern crate futures;

extern crate tokio;

extern crate tokio_hglib;

use chg::{ChgClientExt, ChgUiHandler};

use chg::locator;

use chg::procutil;

use futures::sync::oneshot;

use std::env;

use std::io;

use std::process;

use tokio::prelude::*;

use tokio_hglib::UnixClient;

fn main() {

    let code = run().unwrap_or_else(|err| {

        writeln!(io::stderr(), "chg: abort: {}", err).unwrap_or(());

        255

    });

    process::exit(code);

}

fn run() -> io::Result<i32> {

    let current_dir = env::current_dir()?;

    let sock_path = locator::prepare_server_socket_path()?;

    let handler = ChgUiHandler::new();

    let (result_tx, result_rx) = oneshot::channel();

    let fut = UnixClient::connect(sock_path)

        .and_then(|client| {

            client.set_current_dir(current_dir)

        })

        .and_then(|client| {

            client.attach_io(io::stdin(), io::stdout(), io::stderr())

        })

        .and_then(|client| {

            let pid = client.server_spec().process_id.unwrap();

            let pgid = client.server_spec().process_group_id;

            procutil::setup_signal_handler_once(pid, pgid)?;

            Ok(client)

        })

        .and_then(|client| {

            client.run_command_chg(handler, env::args_os().skip(1))

        })

        .map(|(_client, _handler, code)| {

            procutil::restore_signal_handler_once()?;

            Ok(code)

        })

        .or_else(|err| Ok(Err(err)))  // pass back error to caller

        .map(|res| result_tx.send(res).unwrap());

    tokio::run(fut);

    result_rx.wait().unwrap_or(Err(io::Error::new(io::ErrorKind::Other,

                                                  "no exit code set")))

}