#!/usr/bin/env node
// validate-sidecar — rung-neutral conformance check (spec §6.4, PUC-5).
// usage:
//   node scripts/validate-sidecar.mjs <sidecar.json>
// exit 0 = valid, 1 = invalid (per-error JSON paths on stderr), 2 = usage/IO.
import { readFileSync } from "node:fs";
import { fileURLToPath } from "node:url";
import path from "node:path";
import Ajv from "ajv/dist/2020.js";

const here = path.dirname(fileURLToPath(import.meta.url));
const schema = JSON.parse(readFileSync(path.join(here, "..", "schemas", "coauthoring-sidecar.schema.json"), "utf8"));

const file = process.argv[2];
if (!file) {
  console.error("usage: validate-sidecar.mjs <sidecar.json>");
  process.exit(2);
}

let data;
try {
  data = JSON.parse(readFileSync(file, "utf8"));
} catch (err) {
  console.error(`cannot read/parse ${file}: ${err.message}`);
  process.exit(2);
}

const ajv = new Ajv({ allErrors: true });
const validate = ajv.compile(schema);
if (validate(data)) {
  console.log(`OK ${file} (schemaVersion ${data.schemaVersion})`);
  process.exit(0);
}
for (const e of validate.errors ?? []) console.error(`${e.instancePath || "/"} ${e.message}`);
process.exit(1);