// A bot's own process: node referee/bot.mjs <bot folder>. Loads <bot folder>/bot.mjs, whose default export (or `act`)
// is act(obs, legal) -> move, and answers the referee one JSON line per ask: {n, obs, legal} in, {n, answer} out.
// A bot's prints go to stderr, so they cannot corrupt the channel.
import { createInterface } from 'node:readline';
import path from 'node:path';
import { pathToFileURL } from 'node:url';

const write = process.stdout.write.bind(process.stdout);
console.log = console.info = console.debug = console.warn = console.error;
process.stdout.write = process.stderr.write.bind(process.stderr);

const mod = await import(pathToFileURL(path.join(process.argv[2], 'bot.mjs')).href);
const act = mod.default ?? mod.act;
for await (const line of createInterface({ input: process.stdin })) {
  let m, answer = null;
  try {
    m = JSON.parse(line);
    answer = m.hello ? true : await act(m.obs, m.legal);
  } catch (e) {
    console.error(e);
  }
  write(`${JSON.stringify({ n: m?.n, answer: answer ?? null })}\n`);
}