/**
 * bare-holesail — Holesail TCP/UDP P2P proxy via the official holesail package API only.
 * Initd unit `bare-holesail` (stock-on managed mode; disable via env/initd) and optional early booter instance (kernel-path).
 *
 * Upstream is AGPL-3.0; the booter imports `holesail` directly (same Pear-staged pattern as
 * bare-openssh / bare-ssh2) instead of depending on ctx.bare / drive-bundle resolution.
 */
import { appendVarLog, BARE_OS_VAR_LOG_DIR } from './bare-os-var-log.js'
import { bareHolesailEnvTruthy } from './bare-holesail-env.js'
import {
  bareHolesailManagedServiceIsRunning,
  bareHolesailManagedStartService,
  bareHolesailManagedStopService
} from './bare-holesail-managed.js'
import { bindFallbackEnabled, isAddrInUse } from './bare-os-bind-fallback.js'
import { loadHolesailConstructor } from './bare-holesail-loader.js'
import {
  registerBareInitdDisposer,
  registerBareService,
  registerKernelShutdownHook
} from './bare-initd.js'

export { bareHolesailEnvTruthy }

export const BARE_HOLESAIL_LOG = `${BARE_OS_VAR_LOG_DIR}/holesail.log`

/** @type {unknown} */
let kernelHolesail = null
/** @type {unknown} */
let initdHolesail = null
/** @type {(() => void)[]} */
let initdHookUnsubs = []
/** @type {(() => void)[]} */
let kernelHookUnsubs = []

/** @type {boolean} */
let bareHolesailInitdRegistered = false

/**
 * Register the **bare-holesail** initd unit (call from **`bare-user-session-stack`** after unlock).
 * Stock **`BARE_OS_HOLESAIL_INITD`** default is on; set **`0`** to skip registration.
 * @param {Record<string, string | undefined>} env
 */
export function maybeRegisterBareHolesailInitd(env) {
  if (bareHolesailInitdRegistered) return
  if (!bareHolesailEnvTruthy(env.BARE_OS_HOLESAIL_INITD)) return
  bareHolesailInitdRegistered = true
  registerBareService({
    name: 'bare-holesail',
    description:
      'Holesail P2P TCP/UDP proxy (official holesail API); on by default (managed multi-tunnel for /bin/holesail); disable with BARE_OS_HOLESAIL_INITD=0 or systemctl disable',
    logPath: BARE_HOLESAIL_LOG,
    start: initdStartBareHolesail,
    stop: initdStopBareHolesail
  })
}

/**
 * @param {Record<string, string | undefined>} env
 * @param {string} key
 */
function envStr(env, key) {
  const v = env[key]
  if (v === undefined || v === null) return ''
  return String(v).trim()
}

/**
 * @param {Record<string, string | undefined>} env
 * @param {'initd' | 'kernel'} profile
 * @returns {{ enabled: boolean, err?: string, opts?: Record<string, unknown> }}
 */
export function bareHolesailParseConfig(env, profile) {
  const isKernel = profile === 'kernel'
  const enabled = isKernel
    ? bareHolesailEnvTruthy(env.BARE_OS_HOLESAIL_KERNEL)
    : bareHolesailEnvTruthy(env.BARE_OS_HOLESAIL_INITD)
  if (!enabled) return { enabled: false }

  const P = isKernel ? 'BARE_OS_HOLESAIL_KERNEL_' : 'BARE_OS_HOLESAIL_'
  const server = bareHolesailEnvTruthy(env[`${P}SERVER`])
  const client = bareHolesailEnvTruthy(env[`${P}CLIENT`])
  if (server === client) {
    return {
      enabled: true,
      err: 'holesail: set exactly one of SERVER or CLIENT for this profile'
    }
  }
  const key = envStr(env, `${P}KEY`)
  if (client && !key) {
    return { enabled: true, err: 'holesail: CLIENT requires KEY' }
  }

  /** @type {Record<string, unknown>} */
  const opts = {
    server,
    client,
    key: key || undefined
  }

  const sec = envStr(env, `${P}SECURE`)
  if (sec !== '') opts.secure = bareHolesailEnvTruthy(sec)

  const portRaw = envStr(env, `${P}PORT`)
  if (portRaw !== '') {
    const n = Number.parseInt(portRaw, 10)
    if (!Number.isFinite(n)) {
      return { enabled: true, err: 'holesail: invalid PORT' }
    }
    opts.port = n
  }

  const host = envStr(env, `${P}HOST`)
  if (host !== '') opts.host = host

  const udp = envStr(env, `${P}UDP`)
  if (udp !== '') opts.udp = bareHolesailEnvTruthy(udp)

  const logRaw = envStr(env, `${P}LOG`)
  if (logRaw !== '') {
    if (/^\d+$/.test(logRaw)) opts.log = Number.parseInt(logRaw, 10)
    else opts.log = bareHolesailEnvTruthy(logRaw)
  }

  return { enabled: true, opts }
}

/**
 * @param {Record<string, unknown>} ctx
 * @param {string} line
 */
function logLine(ctx, line) {
  void appendVarLog(ctx, BARE_HOLESAIL_LOG, 'holesail', line)
}

/**
 * @param {Record<string, unknown>} ctx
 * @param {Record<string, string | undefined>} env
 */
function debugEnabled(ctx, env) {
  return bareHolesailEnvTruthy(env.BARE_OS_HOLESAIL_DEBUG)
}

/**
 * @param {unknown} hs
 */
async function safeCloseHolesail(hs) {
  if (!hs || typeof hs.close !== 'function') return
  try {
    await hs.close()
  } catch {
    /* ignore */
  }
}

/**
 * Optional early booter instance: runs after ctx is wired (repl phase), before bare-initd.
 * Env: BARE_OS_HOLESAIL_KERNEL=1 and BARE_OS_HOLESAIL_KERNEL_SERVER|CLIENT, etc.
 *
 * @param {Record<string, unknown>} ctx
 */
export async function maybeStartBareHolesailKernelFromBooter(ctx) {
  const env =
    ctx.env && typeof ctx.env === 'object'
      ? /** @type {Record<string, string | undefined>} */ (ctx.env)
      : /** @type {Record<string, string | undefined>} */ ({})

  const parsed = bareHolesailParseConfig(env, 'kernel')
  if (!parsed.enabled) return
  if (parsed.err) {
    logLine(ctx, `kernel: ${parsed.err}`)
    try {
      ctx.console?.error?.(`[bare-holesail] ${parsed.err}`)
    } catch {
      /* ignore */
    }
    return
  }
  if (!parsed.opts) return

  try {
    const Holesail = await loadHolesailConstructor(ctx)
    let hs = new Holesail(parsed.opts)
    try {
      await hs.ready()
    } catch (e) {
      if (!bindFallbackEnabled(env) || !isAddrInUse(e)) throw e
      await safeCloseHolesail(hs)
      hs = new Holesail({ ...parsed.opts, port: 0 })
      await hs.ready()
      logLine(ctx, 'kernel: ready after EADDRINUSE fallback (ephemeral port)')
    }
    kernelHolesail = hs
    logLine(ctx, 'kernel: ready (early booter instance)')
    if (debugEnabled(ctx, env)) {
      try {
        const info = hs.info
        const url = info && typeof info === 'object' ? info.url : ''
        ctx.console?.log?.(`[bare-holesail] kernel url=${String(url).slice(0, 120)}`)
      } catch {
        /* ignore */
      }
    }

    kernelHookUnsubs.push(
      ctx.bareOsRegisterSuspendHook(async () => {
        if (kernelHolesail && typeof kernelHolesail.pause === 'function') {
          try {
            await kernelHolesail.pause()
          } catch {
            /* ignore */
          }
        }
      })
    )
    kernelHookUnsubs.push(
      ctx.bareOsRegisterResumeHook(async () => {
        if (kernelHolesail && typeof kernelHolesail.resume === 'function') {
          try {
            await kernelHolesail.resume()
          } catch {
            /* ignore */
          }
        }
      })
    )

    registerKernelShutdownHook(async () => {
      for (const u of kernelHookUnsubs.splice(0)) {
        try {
          u()
        } catch {
          /* ignore */
        }
      }
      const h = kernelHolesail
      kernelHolesail = null
      await safeCloseHolesail(h)
      logLine(ctx, 'kernel: closed (session shutdown)')
    })
  } catch (e) {
    const msg = (e && /** @type {{ message?: string }} */ (e).message) || String(e)
    logLine(ctx, `kernel: start error: ${msg}`)
    try {
      ctx.console?.error?.(`[bare-holesail] kernel: ${msg}`)
    } catch {
      /* ignore */
    }
  }
}

async function initdStartBareHolesail(ctx) {
  const env =
    ctx.env && typeof ctx.env === 'object'
      ? /** @type {Record<string, string | undefined>} */ (ctx.env)
      : /** @type {Record<string, string | undefined>} */ ({})

  const initdOn = bareHolesailEnvTruthy(env.BARE_OS_HOLESAIL_INITD)
  const managedOn = bareHolesailEnvTruthy(env.BARE_OS_HOLESAIL_MANAGED)
  if (initdOn && managedOn) {
    try {
      await bareHolesailManagedStartService(ctx, env)
    } catch (e) {
      const msg = (e && /** @type {{ message?: string }} */ (e).message) || String(e)
      logLine(ctx, `initd managed: start error: ${msg}`)
      throw e
    }
    return
  }

  const parsed = bareHolesailParseConfig(env, 'initd')
  if (!parsed.enabled) return
  if (parsed.err) {
    logLine(ctx, `initd: ${parsed.err}`)
    throw new Error(parsed.err)
  }
  if (!parsed.opts) return

  try {
    const Holesail = await loadHolesailConstructor(ctx)
    let hs = new Holesail(parsed.opts)
    try {
      await hs.ready()
    } catch (e) {
      if (!bindFallbackEnabled(env) || !isAddrInUse(e)) throw e
      await safeCloseHolesail(hs)
      hs = new Holesail({ ...parsed.opts, port: 0 })
      await hs.ready()
      logLine(ctx, 'initd: ready after EADDRINUSE fallback (ephemeral port)')
    }
    initdHolesail = hs
    logLine(ctx, 'initd: ready')
    if (debugEnabled(ctx, env)) {
      try {
        const info = hs.info
        const url = info && typeof info === 'object' ? info.url : ''
        ctx.console?.log?.(`[bare-holesail] initd url=${String(url).slice(0, 120)}`)
      } catch {
        /* ignore */
      }
    }

    initdHookUnsubs.push(
      ctx.bareOsRegisterSuspendHook(async () => {
        if (initdHolesail && typeof initdHolesail.pause === 'function') {
          try {
            await initdHolesail.pause()
          } catch {
            /* ignore */
          }
        }
      })
    )
    initdHookUnsubs.push(
      ctx.bareOsRegisterResumeHook(async () => {
        if (initdHolesail && typeof initdHolesail.resume === 'function') {
          try {
            await initdHolesail.resume()
          } catch {
            /* ignore */
          }
        }
      })
    )
  } catch (e) {
    const msg = (e && /** @type {{ message?: string }} */ (e).message) || String(e)
    logLine(ctx, `initd: start error: ${msg}`)
    throw e
  }
}

async function initdStopBareHolesail(ctx) {
  if (bareHolesailManagedServiceIsRunning()) {
    await bareHolesailManagedStopService(ctx)
    logLine(ctx, 'initd: stopped (managed)')
    return
  }
  for (const u of initdHookUnsubs.splice(0)) {
    try {
      u()
    } catch {
      /* ignore */
    }
  }
  const h = initdHolesail
  initdHolesail = null
  await safeCloseHolesail(h)
  logLine(ctx, 'initd: stopped')
}

registerBareInitdDisposer(() => {
  if (bareHolesailManagedServiceIsRunning()) {
    void bareHolesailManagedStopService({})
    return
  }
  for (const u of initdHookUnsubs.splice(0)) {
    try {
      u()
    } catch {
      /* ignore */
    }
  }
  const h = initdHolesail
  initdHolesail = null
  void safeCloseHolesail(h)
})