import { useState } from 'react'
import {
  updateAssignments,
  type Contact,
  type ContactCategory,
  type Org,
} from '../api/client'
import ChannelFiles from './ChannelFiles'
import ChannelPosts from './ChannelPosts'
import ContactPickerModal from './ContactPickerModal'
import StatusBadge from './StatusBadge'
import WorkMemos from './WorkMemos'

// 기관관리 상세 화면. 3단계 대시보드 시안의 "기관관리" 레이아웃을 따른다.
// 웹 DB에 있는 것(연번·기관명·담당자 3종·채널)만 실데이터고,
// 업무단계/통계/일부 탭 내용은 아직 백엔드가 없어 시안과 같은 골격에
// "추후 연동" 자리만 잡아 둔다.

const STEPS = [
  '신청',
  '목록접수',
  '예비검토',
  '변호사 배당',
  '법률검토(권리확인)',
  'RE:확인',
  '법률검토(권리확인) 완료',
  '법률검토(권리처리)',
  'RE:처리',
  '법률검토(권리처리) 완료',
  '법률검토 최종완료',
  '보고서 작성',
]

const TABS = ['채팅', '자료', '권리확인', '권리처리', 'RE', '타임라인', '업무메모']

// 담당 변호사 변경은 카드의 [생성/변경] 버튼으로 대체되어 목록에서 뺐다
const DISABLED_ACTIONS = ['진행단계 변경', '자료 업로드', '최초 게시글 보기', '보고서 관리']

// 카드에서 담당자를 지정/변경할 때 쓰는 역할 정의 (채널관리의 배정과 같은 API를 쓴다)
const CARD_ROLES: Record<
  'applicant' | 'mj' | 'lawyer',
  { category: ContactCategory; pickerTitle: string }
> = {
  applicant: { category: 'APPLICANT', pickerTitle: '신청기관 담당자 선택' },
  mj: { category: 'MJ', pickerTitle: '문정원 담당자 선택' },
  lawyer: { category: 'LAWYER', pickerTitle: '담당 변호사 선택' },
}

// Mattermost 웹 주소. 채널 화면은 팀명 + 채널 내부명으로 열린다.
// 내부명 규칙은 백엔드 ChannelNaming.java가 정본이며 여기서는 열람 링크용으로만 복제한다.
// 기관 코드({연번1}_{연번2})가 하위기관까지 구분하므로 기관명에 따른 별도 특례는 없다.
const MATTERMOST_BASE = 'https://hub.iten.co.kr/itn-hub/channels/'

function mattermostChannelUrl(org: Org): string {
  const slug = org.orgNo.trim().toLowerCase().replace(/_/g, '-').replace(/ /g, '-')
  return MATTERMOST_BASE + `org-${slug}-mj`
}

function Field({ label, value }: { label: string; value: string | null }) {
  return (
    <div className="flex gap-3 text-sm">
      <span className="w-14 shrink-0 text-gray-400">{label}</span>
      <span className={value ? 'font-medium text-gray-900' : 'text-gray-300'}>
        {value ?? '-'}
      </span>
    </div>
  )
}

function ContactCard({
  title,
  fields,
  assigned,
  busy,
  onEdit,
}: {
  title: string
  fields: { label: string; value: string | null }[]
  assigned: boolean
  busy: boolean
  onEdit: () => void
}) {
  return (
    <section className="rounded-lg border border-gray-200 p-4">
      <div className="flex items-center justify-between">
        <h2 className="text-sm font-semibold">{title}</h2>
        <button
          type="button"
          disabled={busy}
          aria-label={`${title} ${assigned ? '변경' : '생성'}`}
          onClick={onEdit}
          className="rounded-md border border-gray-300 px-2 py-0.5 text-xs text-gray-600 hover:bg-gray-50 disabled:opacity-40"
        >
          {assigned ? '변경' : '생성'}
        </button>
      </div>
      <div className="mt-3 space-y-1.5">
        {fields.map((f) => (
          <Field key={f.label} label={f.label} value={f.value} />
        ))}
      </div>
    </section>
  )
}

export default function OrgOverview({
  org,
  onChanged,
}: {
  org: Org
  onChanged?: () => void
}) {
  const [activeTab, setActiveTab] = useState(TABS[0])
  const [pickerRole, setPickerRole] = useState<'applicant' | 'mj' | 'lawyer' | null>(null)
  const [assignBusy, setAssignBusy] = useState(false)
  const [assignError, setAssignError] = useState<string | null>(null)

  async function assign(role: 'applicant' | 'mj' | 'lawyer', contact: Contact) {
    setPickerRole(null)
    setAssignError(null)
    setAssignBusy(true)
    try {
      await updateAssignments(org.id, {
        applicantContactId: role === 'applicant' ? contact.id : (org.applicant?.id ?? null),
        mjContactId: role === 'mj' ? contact.id : (org.mj?.id ?? null),
        lawyerContactId: role === 'lawyer' ? contact.id : (org.lawyer?.id ?? null),
        lawyerAssignedDate: org.lawyerAssignedDate ?? null,
      })
      onChanged?.()
    } catch (e) {
      setAssignError(e instanceof Error ? e.message : '담당자 지정에 실패했습니다.')
    } finally {
      setAssignBusy(false)
    }
  }

  return (
    <div className="p-6">
      <div className="rounded-xl border border-gray-200 bg-white p-6">
        {/* 헤더 */}
        <div className="flex flex-wrap items-center justify-between gap-3">
          <div className="flex items-center gap-3">
            <h1 className="text-lg font-bold">
              {org.orgNo}_{org.orgName}
            </h1>
            <StatusBadge status={org.status} />
          </div>

          <div className="flex flex-wrap gap-2">
            {DISABLED_ACTIONS.map((label) => (
              <button
                key={label}
                type="button"
                disabled
                title="준비 중"
                className="cursor-not-allowed rounded-md border border-gray-200 px-3 py-1.5 text-sm text-gray-300"
              >
                {label}
              </button>
            ))}
            {org.channelIdMj ? (
              <a
                href={mattermostChannelUrl(org)}
                target="_blank"
                rel="noreferrer"
                className="rounded-md border border-gray-300 px-3 py-1.5 text-sm text-gray-700 hover:bg-gray-50"
              >
                Mattermost 열기
              </a>
            ) : (
              <button
                type="button"
                disabled
                title="채널이 아직 없습니다"
                className="cursor-not-allowed rounded-md border border-gray-200 px-3 py-1.5 text-sm text-gray-300"
              >
                Mattermost 열기
              </button>
            )}
          </div>
        </div>

        {/* 담당자 카드 3개 (신청기관/문정원/변호사). 담당자 정보 입력은 담당자관리에서만 하고,
            여기서는 [생성/변경]으로 이미 등록된 담당자를 골라 배정만 한다(채널관리와 같은 API). */}
        <div className="mt-5 grid grid-cols-1 gap-3 lg:grid-cols-3">
          <ContactCard
            title="신청기관 담당자"
            assigned={org.applicant !== null}
            busy={assignBusy}
            onEdit={() => setPickerRole('applicant')}
            fields={[
              { label: '부서', value: org.applicant?.deptName ?? null },
              {
                label: '담당자',
                value: org.applicant
                  ? org.applicant.title
                    ? `${org.applicant.name} ${org.applicant.title}`
                    : org.applicant.name
                  : null,
              },
              { label: '연락처', value: org.applicant?.phone ?? null },
              { label: '이메일', value: org.applicant?.email ?? null },
            ]}
          />
          <ContactCard
            title="문정원 담당자"
            assigned={org.mj !== null}
            busy={assignBusy}
            onEdit={() => setPickerRole('mj')}
            fields={[
              { label: '부서', value: org.mj?.deptName ?? null },
              { label: '담당자', value: org.mj?.name ?? null },
              { label: '연락처', value: org.mj?.phone ?? null },
              { label: '이메일', value: org.mj?.email ?? null },
            ]}
          />
          <ContactCard
            title="담당 변호사"
            assigned={org.lawyer !== null}
            busy={assignBusy}
            onEdit={() => setPickerRole('lawyer')}
            fields={[
              { label: '성명', value: org.lawyer?.name ?? null },
              { label: '연락처', value: org.lawyer?.phone ?? null },
              { label: '이메일', value: org.lawyer?.email ?? null },
              { label: '배정일', value: org.lawyerAssignedDate },
            ]}
          />
        </div>

        {assignError && <p className="mt-2 text-sm text-red-600">{assignError}</p>}

        {pickerRole && (
          <ContactPickerModal
            category={CARD_ROLES[pickerRole].category}
            title={CARD_ROLES[pickerRole].pickerTitle}
            onSelect={(contact) => void assign(pickerRole, contact)}
            onClose={() => setPickerRole(null)}
          />
        )}

        {/* 업무단계 현황 */}
        <section className="mt-5">
          <h2 className="text-sm font-semibold">업무단계 현황</h2>
          <ol className="mt-3 flex gap-2 overflow-x-auto pb-2">
            {STEPS.map((step, i) => (
              <li
                key={step}
                className="flex w-24 shrink-0 flex-col items-center gap-1 rounded-lg border border-gray-200 px-2 py-3 text-center"
              >
                <span className="flex h-6 w-6 items-center justify-center rounded-full border border-gray-300 text-xs text-gray-500">
                  {i + 1}
                </span>
                <span className="text-[11px] leading-tight text-gray-600">{step}</span>
                <span className="text-[11px] text-gray-300">-</span>
              </li>
            ))}
          </ol>
        </section>

        {/* 통계 4칸 */}
        <div className="mt-4 grid grid-cols-2 gap-3 lg:grid-cols-4">
          {[
            ['사전검토', '검토 대상'],
            ['권리확인', '완료 / 전체'],
            ['권리처리', '완료 / 전체'],
            ['RE', '확인·처리 합계'],
          ].map(([title, caption]) => (
            <div key={title} className="rounded-lg border border-gray-200 p-4">
              <p className="text-xs text-gray-400">{title}</p>
              <p className="mt-1 text-sm font-semibold">
                {caption} <span className="ml-1 text-lg text-gray-300">-</span>
              </p>
            </div>
          ))}
        </div>

        {/* 탭 */}
        <div className="mt-6 border-b border-gray-200">
          <nav className="flex gap-1" aria-label="기관 상세 탭">
            {TABS.map((tab) => (
              <button
                key={tab}
                type="button"
                onClick={() => setActiveTab(tab)}
                aria-current={activeTab === tab ? 'true' : undefined}
                className={`border-b-2 px-4 py-2 text-sm ${
                  activeTab === tab
                    ? 'border-blue-600 font-semibold text-blue-600'
                    : 'border-transparent text-gray-500 hover:text-gray-700'
                }`}
              >
                {tab}
              </button>
            ))}
          </nav>
        </div>

        {activeTab === '채팅' ? (
          <div className="mt-4 rounded-lg border border-gray-200">
            <ChannelPosts key={org.id} org={org} />
          </div>
        ) : activeTab === '자료' ? (
          <div className="mt-4 rounded-lg border border-gray-200">
            <ChannelFiles key={org.id} org={org} />
          </div>
        ) : activeTab === '업무메모' ? (
          <div className="mt-4 rounded-lg border border-gray-200">
            <WorkMemos key={org.id} org={org} />
          </div>
        ) : (
          <div className="mt-4 rounded-lg border border-dashed border-gray-200 p-10 text-center text-sm text-gray-400">
            {activeTab} 상세 화면은 추후 확정
          </div>
        )}
      </div>
    </div>
  )
}