const crypto = require('crypto')

const memberKey = (openid) =>
  crypto.createHash('sha256').update(String(openid || '')).digest('hex')

const publicEntry = (entry) => {
  if (!entry) return null
  const { memberKey: _memberKey, openid: _openid, ...publicData } = entry
  return publicData
}

const publicRanked = (ranked) => (ranked || []).map(publicEntry)

const findMyEntry = (ranked, key) => {
  const item = (ranked || []).find(entry => entry.memberKey === key)
  return item ? { ...publicEntry(item), isMe: true } : null
}

module.exports = { memberKey, publicEntry, publicRanked, findMyEntry }