// Spec: docs/specs/wave-based-slack-onboarding.md
//
// Auto-detect existing Slack workspace membership for a Ghost Guild member
// and flag them as `slackInvited` without sending a duplicate invite.
//
// Contract:
// - Caller awaits this helper, but it never throws — all errors swallowed.
// - Internal lookup races against a 3s timeout (resolves null on hang).
// - No-op if Slack service isn't configured, lookup misses, or member is
//   already flagged.

import Member from '../models/member.js'
import { getSlackService } from './slack.ts'

const LOOKUP_TIMEOUT_MS = 3000

export async function autoFlagPreExistingSlackAccess(member) {
  try {
    if (!member || !member._id || !member.email) return
    if (member.slackInvited === true) return

    const slackService = getSlackService()
    if (!slackService) return

    const timeoutPromise = new Promise((resolve) => {
      setTimeout(() => resolve(null), LOOKUP_TIMEOUT_MS)
    })

    let userId = null
    try {
      userId = await Promise.race([
        slackService.findUserByEmail(member.email),
        timeoutPromise
      ])
    } catch (err) {
      console.error('[slackAccess] findUserByEmail failed:', err)
      return
    }

    if (!userId) return

    await Member.findByIdAndUpdate(
      member._id,
      {
        slackInvited: true,
        slackInvitedAt: new Date(),
        slackUserId: userId
      },
      { runValidators: false }
    )

    await logActivity(
      member._id,
      'slack_access_auto_detected',
      { slackUserId: userId },
      { visibility: 'member' }
    )
  } catch (err) {
    console.error('[slackAccess] autoFlagPreExistingSlackAccess error:', err)
  }
}