let input = '';
let activeTimer = null;
let activeMarker = null;

function write(record) {
  process.stdout.write(`${JSON.stringify(record)}\n`);
}

function respond(command, data = {}) {
  write({
    type: 'response',
    id: command.id,
    command: command.type,
    success: true,
    data,
  });
}

function settle(reason) {
  if (!activeMarker) return;
  write({ type: 'agent_end', marker: activeMarker, reason });
  write({ type: 'agent_settled', marker: activeMarker, reason });
  activeMarker = null;
  activeTimer = null;
}

function handle(command) {
  if (command.type === 'prompt') {
    activeMarker = command.message;
    respond(command, { accepted: true });
    write({ type: 'agent_start', marker: activeMarker });
    activeTimer = setTimeout(() => settle('completed'), Number(command.delayMs ?? 100));
    return;
  }
  if (command.type === 'abort') {
    if (activeTimer) clearTimeout(activeTimer);
    respond(command, { aborted: Boolean(activeMarker) });
    settle('aborted');
    return;
  }
  if (command.type === 'get_state') {
    respond(command, { sessionId: `session-${process.pid}` });
    return;
  }
  if (command.type === 'get_entries') {
    respond(command, { entries: [] });
    return;
  }
  respond(command);
}

process.stdin.setEncoding('utf8');
process.stdin.on('data', (chunk) => {
  input += chunk;
  while (true) {
    const newline = input.indexOf('\n');
    if (newline === -1) break;
    const line = input.slice(0, newline).replace(/\r$/, '');
    input = input.slice(newline + 1);
    if (line) handle(JSON.parse(line));
  }
});
process.stdin.on('end', () => {
  if (activeTimer) clearTimeout(activeTimer);
  process.exit(0);
});