import React, { useEffect, useState } from 'react';
import { getVisitRequest, listTodayAccess } from '../api';
import { AccessRecord, VisitRequestView } from '../types';
import { STATUS_CLASS, STATUS_LABEL, formatDateTime } from '../status';

interface Props {
  requestId: number;
  onClose: () => void;
}

export const VisitRequestDetailDialog: React.FC<Props> = ({ requestId, onClose }) => {
  const [request, setRequest] = useState<VisitRequestView | null>(null);
  const [access, setAccess] = useState<AccessRecord | null>(null);
  const [error, setError] = useState<string | null>(null);
  const [loading, setLoading] = useState(true);

  useEffect(() => {
    let alive = true;
    setLoading(true);
    setError(null);
    Promise.all([
      getVisitRequest(requestId),
      listTodayAccess().catch(() => [] as AccessRecord[]),
    ])
      .then(([detail, records]) => {
        if (!alive) return;
        setRequest(detail);
        setAccess(records.find((r) => r.visitRequestId === requestId) ?? null);
      })
      .catch((e) => {
        if (!alive) return;
        setError(e instanceof Error ? e.message : '상세 조회에 실패했습니다.');
      })
      .finally(() => {
        if (alive) setLoading(false);
      });
    return () => {
      alive = false;
    };
  }, [requestId]);

  const status = getDisplayStatus(request, access);

  return (
    <div className="modal-overlay" onClick={onClose}>
      <div className="modal-box detail-modal" onClick={(e) => e.stopPropagation()}>
        <div className="detail-head">
          <div>
            <h3 className="modal-title">출입 신청 상세</h3>
            {request && <p className="modal-message">{request.visitorName} / {request.zoneName || '-'}</p>}
          </div>
          <button className="btn-ghost" onClick={onClose}>닫기</button>
        </div>

        {loading ? (
          <p className="muted">불러오는 중...</p>
        ) : error ? (
          <div className="alert alert-error">{error}</div>
        ) : request ? (
          <>
            <div className="detail-status">
              <span className={`badge badge-${status.className}`}>{status.label}</span>
            </div>
            <div className="form-grid visit-form detail-form">
              <fieldset className="form-group span-2">
                <legend>방문자</legend>
                <div className="group-grid">
                  <ReadOnlyField label="방문자 이름" value={request.visitorName} />
                  <ReadOnlyField label="회사/소속" value={request.company} />
                  <ReadOnlyField label="연락처" value={request.contact} />
                  <ReadOnlyField label="이메일" value={request.email} />

                  <div className="field">
                    <span>출입 전산실</span>
                    <div className="checkbox-row">
                      {['4층전산실', '5층전산실'].map((room) => (
                        <label key={room} className="checkbox-inline">
                          <input type="checkbox" checked={request.zoneName?.includes(room) ?? false} readOnly />
                          <span>{room}</span>
                        </label>
                      ))}
                    </div>
                  </div>

                  <ReadOnlyField label="추가 구역" value={extraZone(request.zoneName)} />
                  <ReadOnlyField label="차량번호" value={request.vehicleNo} />
                  <ReadOnlyField label="출입 목적" value={request.purpose} />
                  <ReadOnlyField label="작업명" value={request.workName} />
                  <ReadOnlyField label="출입 일시" value={formatDateTime(request.visitFrom)} />
                  <ReadOnlyField label="퇴실 예정일시" value={formatDateTime(request.visitTo)} />
                </div>
              </fieldset>

              <fieldset className="form-group span-2">
                <legend>출입통제담당자</legend>
                <div className="group-grid">
                  <ReadOnlyField label="이름" value={request.controlName || request.hostName} />
                  <ReadOnlyField label="담당팀" value={request.controlTeam || request.hostDepartment} />
                  <ReadOnlyField label="연락처" value={request.controlContact} />
                </div>
              </fieldset>

              <fieldset className="form-group span-2">
                <legend>현장감시자</legend>
                <div className="subsection-title">현장감시자1 <em className="hint-inline">: IT센터 사무보조원</em></div>
                <div className="group-grid">
                  <ReadOnlyField label="이름" value={request.watcher1Name} />
                  <ReadOnlyField label="소속" value={request.watcher1Team} />
                  <ReadOnlyField label="연락처" value={request.watcher1Contact} />
                </div>

                <div className="subsection-title">현장감시자2 <em className="hint-inline">: 작업을 입회할 상주직원</em></div>
                <div className="group-grid">
                  <ReadOnlyField label="이름" value={request.watcher2Name} />
                  <ReadOnlyField label="소속" value={request.watcher2Team} />
                  <ReadOnlyField label="연락처" value={request.watcher2Contact} />
                </div>
              </fieldset>

              <fieldset className="form-group span-2">
                <legend>출입 처리 현황</legend>
                <div className="group-grid">
                  <ReadOnlyField label="상태" value={status.label} />
                  <ReadOnlyField label="실제 입장" value={formatDateTime(access?.checkInAt)} />
                  <ReadOnlyField label="실제 퇴장" value={formatDateTime(access?.checkOutAt)} />
                </div>
              </fieldset>
            </div>
          </>
        ) : null}
      </div>
    </div>
  );
};

const ReadOnlyField: React.FC<{ label: string; value?: string | null }> = ({ label, value }) => (
  <label className="field">
    <span>{label}</span>
    <input value={value || '-'} readOnly />
  </label>
);

function extraZone(zoneName?: string): string {
  if (!zoneName) return '-';
  const parts = zoneName.split('/').map((part) => part.trim()).filter(Boolean);
  if (parts.length > 1) return parts.slice(1).join(' / ');
  if (zoneName.includes('전산실')) return '-';
  return zoneName;
}

function getDisplayStatus(request: VisitRequestView | null, access: AccessRecord | null) {
  if (access?.inside) {
    return { label: '재실중', className: 'green' };
  }
  if (access?.checkOutAt) {
    return { label: '퇴실', className: 'gray' };
  }
  if (!request) {
    return { label: '-', className: 'gray' };
  }
  return { label: STATUS_LABEL[request.status], className: STATUS_CLASS[request.status] };
}