'use client'

import { useState, useEffect } from 'react';
import { Button } from '@/components/ui/button';
import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card';
import { Input } from '@/components/ui/input';
import { Label } from '@/components/ui/label';
import { Badge } from '@/components/ui/badge';
import { Separator } from '@/components/ui/separator';
import { toast } from 'sonner';
import { Loader2, Search, FileText, Clock, User, AlertCircle } from 'lucide-react';

// API 함수 및 타입
import { getApprovalDetail, getApprovalContent } from '@/lib/knox-api/approval/approval';
import type { ApprovalDetailResponse, ApprovalContentResponse, ApprovalLine } from '@/lib/knox-api/approval/approval';

// 상태/역할 텍스트 매핑 (mock util 대체)
const getStatusText = (status: string) => {
  const map: Record<string, string> = {
    '-3': '암호화실패',
    '-2': '암호화중',
    '-1': '예약상신',
    '0': '보류',
    '1': '진행중',
    '2': '완결',
    '3': '반려',
    '4': '상신취소',
    '5': '전결',
    '6': '후완결',
  };
  return map[status] || status;
};

const getRoleText = (role: string) => {
  const map: Record<string, string> = {
    '0': '기안',
    '1': '결재',
    '2': '합의',
    '3': '후결',
    '4': '병렬합의',
    '7': '병렬결재',
    '9': '통보',
  };
  return map[role] || role;
};

interface ApprovalDetailProps {
  initialApInfId?: string;
}

interface ApprovalDetailData {
  detail: ApprovalDetailResponse['data'];
  content: ApprovalContentResponse['data'];
}

// 첨부파일 타입 (가이드에 명확히 정의되어 있지 않아 필드 일부 추정)
interface ApprovalAttachment {
  fileName?: string;
  fileSize?: string;
  downloadUrl?: string;
  fileId?: string;
  [key: string]: unknown; // 기타 필드 허용
}

export default function ApprovalDetail({ 
  initialApInfId = ''
}: ApprovalDetailProps) {
  const [apInfId, setApInfId] = useState(initialApInfId);
  const [approvalData, setApprovalData] = useState<ApprovalDetailData | null>(null);
  const [isLoading, setIsLoading] = useState(false);
  const [error, setError] = useState<string | null>(null);

  const fetchApprovalDetail = async (id: string) => {
    if (!id.trim()) {
      toast.error('결재 ID를 입력해주세요.');
      return;
    }

    setIsLoading(true);
    setError(null);
    setApprovalData(null);

    try {
      const [detailResponse, contentResponse] = await Promise.all([
        getApprovalDetail(id),
        getApprovalContent(id)
      ]);

      if (detailResponse.result === 'SUCCESS' && contentResponse.result === 'SUCCESS') {
        setApprovalData({
          detail: detailResponse.data,
          content: contentResponse.data
        });
      } else {
        setError('결재 정보를 가져오는데 실패했습니다.');
        toast.error('결재 정보를 가져오는데 실패했습니다.');
      }
    } catch (err) {
      console.error('결재 상세 조회 오류:', err);
      setError('결재 정보를 가져오는 중 오류가 발생했습니다.');
      toast.error('결재 정보를 가져오는 중 오류가 발생했습니다.');
    } finally {
      setIsLoading(false);
    }
  };

  const formatDate = (dateString: string) => {
    if (!dateString || dateString.length < 14) return dateString;
    // YYYYMMDDHHMMSS 형식을 YYYY-MM-DD HH:MM:SS로 변환
    const year = dateString.substring(0, 4);
    const month = dateString.substring(4, 6);
    const day = dateString.substring(6, 8);
    const hour = dateString.substring(8, 10);
    const minute = dateString.substring(10, 12);
    const second = dateString.substring(12, 14);
    
    return `${year}-${month}-${day} ${hour}:${minute}:${second}`;
  };

  const getSecurityTypeText = (type: string) => {
    const typeMap: Record<string, string> = {
      'PERSONAL': '개인',
      'CONFIDENTIAL': '기밀',
      'CONFIDENTIAL_STRICT': '극기밀'
    };
    return typeMap[type] || type;
  };

  const getSecurityTypeBadgeVariant = (type: string) => {
    switch (type) {
      case 'PERSONAL':
        return 'default';
      case 'CONFIDENTIAL':
        return 'secondary';
      case 'CONFIDENTIAL_STRICT':
        return 'destructive';
      default:
        return 'outline';
    }
  };

  const getStatusBadgeVariant = (status: string) => {
    switch (status) {
      case '2': // 완결
        return 'default';
      case '1': // 진행중
        return 'secondary';
      case '3': // 반려
        return 'destructive';
      case '4': // 상신취소
        return 'outline';
      default:
        return 'outline';
    }
  };

  // 첨부파일 다운로드 헬퍼
  const handleDownload = async (attachment: ApprovalAttachment) => {
    try {
      // 1) downloadUrl 이 이미 포함된 경우
      if (attachment.downloadUrl) {
        window.open(attachment.downloadUrl, '_blank');
        return;
      }

      // 2) fileId + 별도 엔드포인트 조합 (가이드에 명시되지 않았으므로 best-effort 처리)
      if (attachment.fileId) {
        const url = `${process.env.NEXT_PUBLIC_KNOX_API_BASE_URL || ''}/approval/api/v2.0/attachments/${attachment.fileId}`;
        const resp = await fetch(url, {
          method: 'GET',
          headers: {
            'System-ID': process.env.NEXT_PUBLIC_KNOX_SYSTEM_ID || '',
          },
        });
        if (!resp.ok) throw new Error('다운로드 실패');

        // blob 생성 후 브라우저 다운로드
        const blob = await resp.blob();
        const link = document.createElement('a');
        link.href = URL.createObjectURL(blob);
        link.download = attachment.fileName || 'attachment';
        link.click();
        URL.revokeObjectURL(link.href);
        return;
      }

      toast.error('다운로드 URL 정보를 찾을 수 없습니다.');
    } catch (err) {
      console.error('첨부파일 다운로드 오류:', err);
      toast.error('첨부파일 다운로드 중 오류가 발생했습니다.');
    }
  };

  // 초기 로딩 (initialApInfId가 있는 경우)
  useEffect(() => {
    if (initialApInfId) {
      fetchApprovalDetail(initialApInfId);
    }
  }, [initialApInfId]);

  return (
    <Card className="w-full max-w-5xl">
      <CardHeader>
        <CardTitle className="flex items-center gap-2">
          <FileText className="w-5 h-5" />
          결재 상세 조회
        </CardTitle>
        <CardDescription>
          결재 ID를 입력하여 상세 정보를 조회합니다.
        </CardDescription>
      </CardHeader>

      <CardContent className="space-y-6">
        {/* 검색 영역 */}
        <div className="flex items-center gap-3">
          <div className="flex-1">
            <Label htmlFor="apInfId">결재 ID</Label>
            <Input
              id="apInfId"
              placeholder="결재 ID를 입력하세요"
              value={apInfId}
              onChange={(e) => setApInfId(e.target.value)}
              onKeyPress={(e) => e.key === 'Enter' && fetchApprovalDetail(apInfId)}
            />
          </div>
          <Button
            onClick={() => fetchApprovalDetail(apInfId)}
            disabled={isLoading}
          >
            {isLoading ? (
              <>
                <Loader2 className="w-4 h-4 mr-2 animate-spin" />
                조회 중...
              </>
            ) : (
              <>
                <Search className="w-4 h-4 mr-2" />
                조회
              </>
            )}
          </Button>
        </div>

        {/* 에러 메시지 */}
        {error && (
          <div className="p-4 bg-red-50 border border-red-200 rounded-lg">
            <div className="flex items-center gap-2 text-red-700">
              <AlertCircle className="w-4 h-4" />
              <span className="font-medium">오류</span>
            </div>
            <p className="text-sm text-red-600 mt-1">{error}</p>
          </div>
        )}

        {/* 결재 상세 정보 */}
        {approvalData && (
          <div className="space-y-6">
            {/* 기본 정보 */}
            <div className="space-y-4">
              <h3 className="text-lg font-semibold flex items-center gap-2">
                <FileText className="w-5 h-5" />
                기본 정보
              </h3>
              
              <div className="grid grid-cols-2 gap-4 p-4 bg-gray-50 rounded-lg">
                <div>
                  <Label className="text-sm font-medium text-gray-600">결재 ID</Label>
                  <p className="text-sm font-mono mt-1">{approvalData.detail.apInfId}</p>
                </div>
                <div>
                  <Label className="text-sm font-medium text-gray-600">시스템 ID</Label>
                  <p className="text-sm mt-1">{approvalData.detail.systemId}</p>
                </div>
                <div>
                  <Label className="text-sm font-medium text-gray-600">제목</Label>
                  <p className="text-sm mt-1 font-medium">{approvalData.detail.subject}</p>
                </div>
                <div>
                  <Label className="text-sm font-medium text-gray-600">상신일시</Label>
                  <p className="text-sm mt-1 flex items-center gap-2">
                    <Clock className="w-4 h-4" />
                    {formatDate(approvalData.detail.sbmDt)}
                  </p>
                </div>
                <div>
                  <Label className="text-sm font-medium text-gray-600">상태</Label>
                  <div className="mt-1">
                    <Badge variant={getStatusBadgeVariant(approvalData.detail.status)}>
                      {getStatusText(approvalData.detail.status)}
                    </Badge>
                  </div>
                </div>
                <div>
                  <Label className="text-sm font-medium text-gray-600">보안 등급</Label>
                  <div className="mt-1">
                    <Badge variant={getSecurityTypeBadgeVariant(approvalData.detail.docSecuType)}>
                      {getSecurityTypeText(approvalData.detail.docSecuType)}
                    </Badge>
                  </div>
                </div>
                <div>
                  <Label className="text-sm font-medium text-gray-600">긴급 여부</Label>
                  <div className="mt-1">
                    <Badge variant={approvalData.detail.urgYn === 'Y' ? 'destructive' : 'outline'}>
                      {approvalData.detail.urgYn === 'Y' ? '긴급' : '일반'}
                    </Badge>
                  </div>
                </div>
                <div>
                  <Label className="text-sm font-medium text-gray-600">언어</Label>
                  <p className="text-sm mt-1">{approvalData.detail.sbmLang}</p>
                </div>
              </div>
            </div>

            <Separator />

            {/* 결재 내용 */}
            <div className="space-y-4">
              <h3 className="text-lg font-semibold">결재 내용</h3>
              
              <div className="p-4 bg-gray-50 rounded-lg">
                <div className="mb-2">
                  <Label className="text-sm font-medium text-gray-600">내용 형식</Label>
                  <Badge variant="outline" className="ml-2">
                    {approvalData.content.contentsType}
                  </Badge>
                </div>
                
                <div className="mt-4 p-4 bg-white rounded border">
                  <pre className="whitespace-pre-wrap text-sm">
                    {approvalData.content.contents}
                  </pre>
                </div>
              </div>
            </div>

            <Separator />

            {/* 결재 경로 */}
            <div className="space-y-4">
              <h3 className="text-lg font-semibold flex items-center gap-2">
                <User className="w-5 h-5" />
                결재 경로
              </h3>
              
              <div className="space-y-3">
                {approvalData.detail.aplns.map((apln: ApprovalLine, index: number) => (
                  <div key={index} className="flex items-center gap-4 p-4 border rounded-lg">
                    <Badge variant="outline" className="min-w-[40px] text-center">
                      {apln.seq}
                    </Badge>
                    
                    <div className="flex-1 grid grid-cols-4 gap-4">
                      <div>
                        <Label className="text-xs font-medium text-gray-600">사용자 ID</Label>
                        <p className="text-sm mt-1">{apln.userId || apln.epId || '-'}</p>
                      </div>
                      <div>
                        <Label className="text-xs font-medium text-gray-600">이메일</Label>
                        <p className="text-sm mt-1">{apln.emailAddress || '-'}</p>
                      </div>
                      <div>
                        <Label className="text-xs font-medium text-gray-600">역할</Label>
                        <div className="mt-1">
                          <Badge variant="secondary">
                            {getRoleText(apln.role)}
                          </Badge>
                        </div>
                      </div>
                      <div>
                        <Label className="text-xs font-medium text-gray-600">상태</Label>
                        <div className="mt-1">
                          <Badge variant={apln.aplnStatsCode === '1' ? 'default' : 
                                        apln.aplnStatsCode === '2' ? 'destructive' : 'outline'}>
                            {getStatusText(apln.aplnStatsCode)}
                          </Badge>
                        </div>
                      </div>
                    </div>
                    
                    <div className="flex flex-col gap-1 text-xs">
                      {apln.arbPmtYn === 'Y' && (
                        <Badge variant="outline" className="text-xs">전결권한</Badge>
                      )}
                      {apln.contentsMdfyPmtYn === 'Y' && (
                        <Badge variant="outline" className="text-xs">본문수정</Badge>
                      )}
                      {apln.aplnMdfyPmtYn === 'Y' && (
                        <Badge variant="outline" className="text-xs">경로변경</Badge>
                      )}
                    </div>
                  </div>
                ))}
              </div>
            </div>

            {/* 첨부파일 */}
            {approvalData.detail.attachments && approvalData.detail.attachments.length > 0 && (
              <>
                <Separator />
                <div className="space-y-4">
                  <h3 className="text-lg font-semibold">첨부파일</h3>
                  
                  <div className="space-y-2">
                    {/* eslint-disable-next-line @typescript-eslint/no-explicit-any */}
                    {approvalData.detail.attachments.map((attachment: any, index: number) => (
                      <div key={index} className="flex items-center gap-3 p-3 bg-gray-50 rounded-lg">
                        <FileText className="w-4 h-4 text-gray-500" />
                        <div className="flex-1">
                          <p className="text-sm font-medium">{attachment.fileName || `첨부파일 ${index + 1}`}</p>
                          <p className="text-xs text-gray-500">{attachment.fileSize || '크기 정보 없음'}</p>
                        </div>
                        <Button 
                          variant="outline" 
                          size="sm" 
                          onClick={() => handleDownload(attachment)}
                        >
                          다운로드
                        </Button>
                      </div>
                    ))}
                  </div>
                </div>
              </>
            )}
          </div>
        )}
      </CardContent>
    </Card>
  );
}