import { createHash } from 'node:crypto'
import Member from '../models/member.js'
import Event from '../models/event.js'
import PreRegistration from '../models/preRegistration.js'
import TagSuggestion from '../models/tagSuggestion.js'
import AdminAlertDismissal, { ADMIN_ALERT_TYPES } from '../models/adminAlertDismissal.js'
import { connectDB } from './mongoose.js'

export const ALERT_THRESHOLDS = {
  NO_SLACK_DAYS: 7,
  STUCK_PAYMENT_DAYS: 7,
  PREREG_SELECTED_DAYS: 3,
  DRAFT_IMMINENT_DAYS: 14,
  NEAR_CAPACITY_RATIO: 0.8
}

const DAY_MS = 24 * 60 * 60 * 1000

function daysAgo(days) {
  return new Date(Date.now() - days * DAY_MS)
}

function daysSince(date) {
  if (!date) return null
  return Math.floor((Date.now() - new Date(date).getTime()) / DAY_MS)
}

export function computeSignature(ids) {
  const normalized = ids
    .map((id) => (id == null ? '' : String(id)))
    .sort()
  const hash = createHash('sha1')
  hash.update(JSON.stringify(normalized))
  return hash.digest('hex')
}

// Alert functions land here in tasks 4–7.

// Aggregator lands in task 8.