export interface SimpleApln {
  seq: string
  name?: string
  emailAddress?: string
  role: string
}

export function formatApprovalLine(aplns: SimpleApln[]): string {
  if (!aplns || aplns.length === 0) return '결재자 없음'

  const roleMap: Record<string, string> = {
    '0': '기안',
    '1': '결재',
    '2': '합의',
    '3': '후결',
    '4': '병렬합의',
    '7': '병렬결재',
    '9': '통보',
  }

  const groupedBySeq = aplns.reduce<Record<string, SimpleApln[]>>((groups, apln) => {
    const seq = apln.seq
    if (!groups[seq]) groups[seq] = []
    groups[seq].push(apln)
    return groups
  }, {})

  const sortedSeqs = Object.keys(groupedBySeq).sort((a, b) => parseInt(a) - parseInt(b))

  return sortedSeqs
    .map((seq) => {
      const group = groupedBySeq[seq]
      const isParallel = group.length > 1 || group.some((apln) => apln.role === '4' || apln.role === '7')
      if (isParallel) {
        const parallelMembers = group
          .map((apln) => {
            const name = apln.name || apln.emailAddress || '이름없음'
            const role = roleMap[apln.role] || '알수없음'
            return `${name}(${role})`
          })
          .join(', ')
        return `[${parallelMembers}]`
      } else {
        const apln = group[0]
        const name = apln.name || apln.emailAddress || '이름없음'
        const role = roleMap[apln.role] || '알수없음'
        return `${name}(${role})`
      }
    })
    .join(' → ')
}