/**
 * Flying Jib CLI — Bare entry (ADR-0013).
 *
 * Usage:
 *   bare bin.mjs create <name>
 *   bare bin.mjs list
 *   bare bin.mjs start <name> [--port 25565]
 *   bare bin.mjs host <name> [--port 25565]     # start + share invite
 *   bare bin.mjs join <invite> [--port 25565]   # client tunnel
 *   bare bin.mjs status
 */

import { createRequire } from 'module'
import { command, flag, arg, summary, header, footer } from 'paparam'
import path from 'path'
import process from 'process'
import { fileURLToPath } from 'url'
import pkg from './package.json' with { type: 'json' }
import App from './app.js'

const require = createRequire(import.meta.url)
const __filename = fileURLToPath(import.meta.url)
const __dirname = path.dirname(__filename)

const appName = pkg.productName || pkg.name
const isBare = typeof Bare !== 'undefined'
const argv0 = isBare ? Bare.argv[0] : process.argv[0]
const base = path.basename(argv0)
const isDev = base === 'bare' || base === 'node' || /bare-runtime/.test(argv0)
const rawArgv = isBare ? Bare.argv.slice(isDev ? 2 : 1) : process.argv.slice(2)

function resolveStorage(flagStorage) {
  if (flagStorage) return path.resolve(flagStorage)
  const os = require('os')
  if (isBare) {
    try {
      const { persistent } = require('bare-storage')
      return isDev ? path.join(os.tmpdir(), 'pear', appName) : path.join(persistent(), appName)
    } catch {
      return path.join(os.tmpdir(), 'pear', appName)
    }
  }
  return path.join(os.tmpdir(), 'pear', appName)
}

function exit(code) {
  if (isBare) Bare.exit(code)
  else process.exit(code)
}

function makeApp(storage, updates = false) {
  return new App({
    dir: storage,
    appPath: isDev ? null : argv0,
    updates,
    version: pkg.version,
    upgrade: pkg.upgrade,
    name: appName
  })
}

/** Attach signal handlers once; re-entrant safe via app.exit */
function attachShutdown(app) {
  let stopping = false
  const shutdown = async (code) => {
    if (stopping) return
    stopping = true
    console.log('\nStopping…')
    try {
      await app.exit(code)
    } catch (err) {
      console.error('[shutdown]', err.message || err)
    }
    exit(code)
  }
  process.on('SIGINT', () => {
    shutdown(130)
  })
  process.on('SIGTERM', () => {
    shutdown(143)
  })
  if (isBare && typeof Bare !== 'undefined' && Bare.on) {
    try {
      Bare.on('exit', () => {
        // best-effort; async exit may not finish
      })
    } catch {
      // ignore
    }
  }
  return shutdown
}

const createCmd = command(
  'create',
  summary('Create a new local world'),
  arg('<name>', 'world name / id'),
  flag('--version [ver]', 'Minecraft version for Flying Squid'),
  flag('--motd [text]', 'server MOTD'),
  async (cmd) => {
    const storage = resolveStorage(root.flags.storage)
    const app = makeApp(storage, false)
    await app.ready()
    try {
      const meta = app.createWorld({
        name: cmd.args.name,
        version: cmd.flags.version,
        motd: cmd.flags.motd
      })
      console.log('Created world:', meta.id)
      console.log('  version:', meta.version)
      console.log('  path:   ', path.join(storage, 'worlds', meta.id))
    } finally {
      await app.close()
    }
  }
)

const listCmd = command(
  'list',
  summary('List local worlds'),
  async () => {
    const storage = resolveStorage(root.flags.storage)
    const app = makeApp(storage, false)
    await app.ready()
    try {
      const worlds = app.listWorlds()
      if (!worlds.length) {
        console.log('No worlds yet. Create one: flying-jib create <name>')
        return
      }
      for (const w of worlds) {
        console.log(`- ${w.id}  (${w.version})  ${w.name}`)
      }
    } finally {
      await app.close()
    }
  }
)

const startCmd = command(
  'start',
  summary('Start local Flying Squid (127.0.0.1 only, no P2P share)'),
  arg('<name>', 'world name / id'),
  flag('--port|-p [port]', 'local Minecraft port (default 25565)'),
  flag('--version [ver]', 'override Minecraft version'),
  async (cmd) => {
    const storage = resolveStorage(root.flags.storage)
    const app = makeApp(storage, false)
    app.on('message', (m) => console.log(m))
    app.on('error', (err) => console.error('[error]', err))
    attachShutdown(app)

    await app.ready()
    try {
      const status = await app.startWorld({
        world: cmd.args.name,
        port: cmd.flags.port ? Number(cmd.flags.port) : 25565,
        version: cmd.flags.version
      })
      console.log('')
      console.log(`${appName} local world running`)
      console.log(`  world:  ${cmd.args.name}`)
      console.log(`  bind:   ${status.host}:${status.port}`)
      console.log('')
      console.log('Connect Java Edition to:')
      console.log(`  ${status.host}:${status.port}`)
      console.log('')
      console.log('Press Ctrl+C to stop.')
      await new Promise(() => {})
    } catch (err) {
      console.error('[start failed]', err)
      await app.close()
      exit(1)
    }
  }
)

const hostCmd = command(
  'host',
  summary('Start world and share via HyperDHT (prints fj1. invite)'),
  arg('<name>', 'world name / id'),
  flag('--port|-p [port]', 'local Minecraft port (default 25565)'),
  flag('--version [ver]', 'override Minecraft version'),
  async (cmd) => {
    const storage = resolveStorage(root.flags.storage)
    const app = makeApp(storage, false)
    app.on('message', (m) => console.log(m))
    app.on('error', (err) => console.error('[error]', err))
    attachShutdown(app)

    await app.ready()
    try {
      const result = await app.hostWorld({
        world: cmd.args.name,
        port: cmd.flags.port ? Number(cmd.flags.port) : 25565,
        version: cmd.flags.version
      })
      console.log('')
      console.log(`${appName} hosting private world (P2P)`)
      console.log(`  world:  ${cmd.args.name}`)
      console.log(`  local:  ${result.squid.host}:${result.squid.port}`)
      console.log(`  tunnel: HyperDHT host`)
      console.log('')
      console.log('Invite (treat as secret — fj1. capability):')
      console.log(result.invite)
      console.log('')
      console.log('Friends run:')
      console.log(`  flying-jib join '<invite>'`)
      console.log('')
      console.log('You connect Java Edition to:')
      console.log(`  ${result.squid.host}:${result.squid.port}`)
      console.log('')
      console.log('Press Ctrl+C to stop.')
      await new Promise(() => {})
    } catch (err) {
      console.error('[host failed]', err)
      await app.close()
      exit(1)
    }
  }
)

const joinCmd = command(
  'join',
  summary('Join a private world from an fj1. invite'),
  arg('<invite>', 'fj1. invite string'),
  flag('--port|-p [port]', 'local bind port (default: ephemeral)'),
  async (cmd) => {
    const storage = resolveStorage(root.flags.storage)
    const app = makeApp(storage, false)
    app.on('message', (m) => console.log(m))
    app.on('error', (err) => console.error('[error]', err))
    attachShutdown(app)

    await app.ready()
    try {
      const result = await app.joinWorld({
        invite: cmd.args.invite,
        localPort: cmd.flags.port ? Number(cmd.flags.port) : 0
      })
      const port = result.tunnel.localPort
      console.log('')
      console.log(`${appName} joined remote world`)
      console.log(`  name:    ${result.invite.name || '(unnamed)'}`)
      console.log(`  version: ${result.invite.mcVersion || 'unknown'}`)
      console.log(`  local:   127.0.0.1:${port}`)
      console.log('')
      console.log('Connect Java Edition to:')
      console.log(`  127.0.0.1:${port}`)
      console.log('')
      console.log('Press Ctrl+C to stop.')
      await new Promise(() => {})
    } catch (err) {
      console.error('[join failed]', err)
      await app.close()
      exit(1)
    }
  }
)

const statusCmd = command(
  'status',
  summary('Show storage path and worlds'),
  async () => {
    const storage = resolveStorage(root.flags.storage)
    console.log('storage:', storage)
    const app = makeApp(storage, false)
    await app.ready()
    try {
      const worlds = app.listWorlds()
      console.log('worlds:', worlds.length)
      for (const w of worlds) console.log(' -', w.id, w.version)
    } finally {
      await app.close()
    }
  }
)

const root = command(
  appName,
  header(`${appName} — decentralized P2P Minecraft (Bare/Pear)`),
  summary(pkg.description),
  flag('--version|-v', 'Print version'),
  flag('--storage <dir>', 'App storage directory'),
  footer('Docs: living_docs/ | agent/ADRs/0013-bare-pear-only-runtime-and-distribution.md'),
  createCmd,
  listCmd,
  startCmd,
  hostCmd,
  joinCmd,
  statusCmd
)

root.parse(rawArgv)
if (root.flags.version) {
  console.log(`${appName} v${pkg.version}`)
  exit(0)
}

void __dirname
void __filename