// A stand-in harness turn for the runner tests. MOSAIC_REQUEST's body
// (after the blank line) picks the behaviour:
//   TOOL <name> <json>   call a typed tool through the tool socket, print the result or refusal
//   SLEEP                hang until killed
//   FAIL                 exit 3
//   NOMARKER             answer without writing the turn marker
//   anything else        answer "echo: <request>"
// Every turn appends its pid to $FAKE_PIDS when set.

import { appendFileSync, writeFileSync } from "node:fs";
import { callTool } from "../../src/tools.mjs";

const request = process.env.MOSAIC_REQUEST ?? "";
const body = request.split("\n\n").slice(1).join("\n\n");
if (process.env.FAKE_PIDS) appendFileSync(process.env.FAKE_PIDS, `${process.pid}\n`);
process.stderr.write(`fake adapter: ${process.env.MOSAIC_MODEL}\n`);
const done = () => writeFileSync(process.env.MOSAIC_TURN_MARKER, "done\n");

if (body.startsWith("TOOL ")) {
  const [, name, ...rest] = body.split(" ");
  try {
    process.stdout.write(JSON.stringify(await callTool(process.env.MOSAIC_TOOL_SOCKET, name, JSON.parse(rest.join(" ") || "{}"))));
  } catch (e) {
    process.stdout.write(e.message);
  }
  done();
} else if (body === "SLEEP") {
  setInterval(() => {}, 1000);
} else if (body === "FAIL") {
  process.exit(3);
} else if (body === "NOMARKER") {
  process.stdout.write("half an answer");
} else {
  process.stdout.write(`echo: ${request}\n`);
  done();
}