//---------------------------------------------------------------------------
// @syndicate-lang/syntax-test, a demo of Syndicate extensions to JS.
// Copyright (C) 2016-2018 Tony Garnock-Jones <tonyg@leastfixedpoint.com>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.
//---------------------------------------------------------------------------

const { Observe, currentFacet, genUuid } = require("@syndicate-lang/core");
const { sleep } = activate require("@syndicate-lang/driver-timer");
const S = activate require("@syndicate-lang/driver-streams-node");

const stdin = genUuid('stdin');
const stdout = genUuid('stdout');
spawn named 'stdioServer' {
  during Observe(S.Stream(stdin, S.Readable()))
    spawn S.readableStreamBehaviour(stdin, process.stdin);
  during Observe(S.Stream(stdout, S.Writable()))
    spawn S.writableStreamBehaviour(stdout, process.stdout);
}

spawn named 'chatclient-via-nc' {
  const id = genUuid('p');
  assert S.Subprocess(id, 'nc', ['localhost', '5999'], {stdio: ['pipe', 'pipe', 'ignore']});
  stop on message S.SubprocessError(id, $err) {
    console.error("Couldn't start subprocess", err);
  }
  stop on retracted S.Stream(stdin, S.Readable());
  stop on retracted S.Stream(stdout, S.Writable());
  on asserted S.SubprocessRunning(id, _, [$i, $o, _]) {
    react {
      on message S.Stream(stdin, S.Line($line)) {
        console.log('INPUT:', line);
        send S.Stream(i, S.Push(line.fromUtf8() + '\n', false));
      }
      on message S.Stream(stdin, S.End()) {
        console.log('INPUT EOF');
        send S.Stream(i, S.Close(false));
      }

      on message S.Stream(o, S.Line($line)) {
        send S.Stream(stdout, S.Push(line.fromUtf8() + '\n', false));
      }
    }
  }
  stop on asserted S.SubprocessExit(id, $code, $signal) {
    if (code !== 0) {
      console.error('Subprocess exited with code', code, 'signal', signal);
    }
  }
}