#!/usr/bin/env node
import { execSync } from "node:child_process";
import { readFileSync, writeFileSync } from "node:fs";
import { fileURLToPath } from "node:url";
import { dirname, resolve } from "node:path";

const __dirname = dirname(fileURLToPath(import.meta.url));
const versionPath = resolve(__dirname, "..", "version.json");

function git(args) {
  return execSync(`git ${args}`, { encoding: "utf8" }).trim();
}

let commit = "unknown";
let date = new Date().toISOString().slice(0, 10).replace(/-/g, "");
try {
  commit = git("log -1 --format=%h");
  date = git("log -1 --format=%cd --date=format:%Y%m%d");
} catch (err) {
  console.warn(`[update-version] git unavailable, using fallback: ${err.message}`);
}

const build = `${date}.${commit}`;
const current = JSON.parse(readFileSync(versionPath, "utf8"));
const next = { ...current, build };

if (current.build === build) {
  console.log(`[update-version] build unchanged: ${build}`);
} else {
  writeFileSync(versionPath, JSON.stringify(next, null, 2) + "\n");
  console.log(`[update-version] ${current.build} -> ${build}`);
}