#!/usr/bin/env node

import { execFileSync, spawnSync } from 'node:child_process'

function fail(message) {
  console.error(`release_preflight=FAIL ${message}`)
  process.exit(1)
}

function git(args) {
  try {
    return execFileSync('git', args, {
      encoding: 'utf8',
      stdio: ['ignore', 'pipe', 'pipe'],
    }).trim()
  } catch (error) {
    const stderr = error.stderr?.toString().trim()
    fail(stderr ? `git_error=${JSON.stringify(stderr)}` : 'git command failed')
  }
}

const root = git(['rev-parse', '--show-toplevel'])
process.chdir(root)

for (const args of [['diff', '--quiet'], ['diff', '--cached', '--quiet']]) {
  if (spawnSync('git', args, { stdio: 'ignore' }).status !== 0) {
    fail('the worktree must be clean')
  }
}
if (git(['ls-files', '--others', '--exclude-standard'])) {
  fail('the worktree must not contain untracked files')
}

const sourceSha = git(['rev-parse', '--verify', 'HEAD^{commit}'])
if (!/^[0-9a-f]{40}$/.test(sourceSha)) fail('HEAD is not a full Git commit')
const mainSha = git(['rev-parse', '--verify', 'refs/remotes/origin/main^{commit}'])
if (!/^[0-9a-f]{40}$/.test(mainSha)) fail('origin/main is unavailable')
if (spawnSync('git', ['merge-base', '--is-ancestor', sourceSha, mainSha], { stdio: 'ignore' }).status !== 0) {
  fail('HEAD is not part of origin/main history')
}

console.log(JSON.stringify({ sourceSha, originMainSha: mainSha }))