#!/usr/bin/env node
/**
 * Resolve the Pear link for a workspace package (stage / release).
 *
 * Pear CLI v2.5+ requires pear://<key> (not channel names).
 *
 * Resolution order:
 *   1. BARE_OS_SEEDER_PEAR_LINK / BARE_OS_BOOTER_PEAR_LINK (always wins)
 *   2. If BARE_OS_PEAR_USE_PUBLISHED_LINK=1 (seeder): package.json pear.link, then pear.stageLink
 *   3. <package-dir>/.pear-stage-link (writable local; gitignored)
 *   4. package.json pear.stageLink
 *   5. package.json pear.link (booter default; seeder fallback)
 *
 * Usage: node scripts/resolve-pear-link.mjs <package-dir>
 */

import { readFileSync, existsSync } from 'node:fs'
import path from 'node:path'

const pkgDir = path.resolve(process.argv[2] ?? '')
if (!pkgDir) {
  console.error('usage: resolve-pear-link.mjs <package-dir>')
  process.exit(1)
}

const ENV_BY_PKG = {
  'bare-os-seeder': 'BARE_OS_SEEDER_PEAR_LINK',
  'bare-os-booter': 'BARE_OS_BOOTER_PEAR_LINK'
}

const LOCAL_LINK_FILE = '.pear-stage-link'

const pkgJsonPath = path.join(pkgDir, 'package.json')
let pkgJson
try {
  pkgJson = JSON.parse(readFileSync(pkgJsonPath, 'utf8'))
} catch (err) {
  console.error(`Could not read ${pkgJsonPath}: ${err.message}`)
  process.exit(1)
}

const name = pkgJson.pear?.name ?? pkgJson.name
const envKey = ENV_BY_PKG[name]
const fromEnv = envKey ? process.env[envKey]?.trim() : undefined

const localPath = path.join(pkgDir, LOCAL_LINK_FILE)
const fromLocal = existsSync(localPath)
  ? readFileSync(localPath, 'utf8').trim()
  : undefined

const fromStageLink = pkgJson.pear?.stageLink?.trim()
const fromPublishedLink = pkgJson.pear?.link?.trim()
const usePublished =
  process.env.BARE_OS_PEAR_USE_PUBLISHED_LINK === '1' ||
  process.env.BARE_OS_PEAR_USE_PUBLISHED_LINK === 'true'

let link = ''
if (fromEnv) {
  link = fromEnv
} else if (name === 'bare-os-booter') {
  link = fromLocal ?? fromStageLink ?? fromPublishedLink ?? ''
} else if (usePublished) {
  link = fromPublishedLink ?? fromStageLink ?? fromLocal ?? ''
} else {
  link = fromLocal ?? fromStageLink ?? fromPublishedLink ?? ''
}

if (!link) {
  const publishedHint =
    name === 'bare-os-seeder'
      ? `Production seeder link (pear.link) is read-only on most hosts.\n` +
        `  node scripts/bootstrap-pear-stage-link.mjs ${pkgDir}\n` +
        `  Or set ${envKey}.\n` +
        `  Maintainer host only: BARE_OS_PEAR_USE_PUBLISHED_LINK=1`
      : `Set ${envKey} or add "pear": { "link": "pear://…" } to ${pkgJsonPath}.`
  console.error(`Missing Pear link for ${name ?? pkgDir}.\n${publishedHint}`)
  process.exit(1)
}

if (!/^pear:\/\/[a-z0-9]+$/i.test(link)) {
  console.error(`Invalid Pear link (expected pear://<key>): ${link}`)
  process.exit(1)
}

process.stdout.write(`${link}\n`)