'use client';

import { useState, useEffect, useCallback } from 'react';
import { getCreditInfo } from '@/lib/oracle-db/nonsap/services/creditService';

// 신용평가사 옵션
const creditServices = [
  { code: 'I', name: '이크레더블' },
  { code: 'K', name: '한국기업데이터' },
  { code: 'N', name: '나이스디앤비' },
  { code: 'E', name: 'NICE신용평가사' }
];

interface CreditData {
  // 기본 정보
  RESNO: string;
  EENTNM: string;
  OPEDT: string;
  REPR_NM: string;
  TYSCALE: string;
  RELCMP: string;
  ADR: string;
  LISTYN: string;
  GOODSNM: string;
  TELNO: string;
  FAXNO: string;
  FSTRDRT: string;
  
  // 매출순위
  MO_1: string;
  MO_4: string;
  MO_2: string;
  MO_5: string;
  MO_3: string;
  MO_6: string;
  
  // 매입순위
  MI_1: string;
  MI_4: string;
  MI_2: string;
  MI_5: string;
  MI_3: string;
  MI_6: string;
  
  // 지분관계
  GIBUN_RL_1: string;
  LSH_STK_RATE1: string;
  GIBUN_RL_2: string;
  LSH_STK_RATE2: string;
  GIBUN_RL_3: string;
  LSH_STK_RATE3: string;
  
  // 기타 정보
  HAPGYE: string;
  NOTICE: string;
  NOTICE_DT: string;
  HPGBNCR_TY: string;
  FCLOSDT: string;
  LASTGRD: string;
  DECISION: string;
  FRISKRV: string;
  EXPIRE_GB: string;
  FWATCHD: string;
  SUVDT: string;
  ESETDTT: string;
  
  // 재무년월
  bs_dt0: string;
  bs_dt1: string;
  bs_dt2: string;
  
  // 재무현황
  bs59_0: string; // 총자산
  bs59_1: string;
  bs59_2: string;
  bs91_0: string; // 부채총계
  bs91_1: string;
  bs91_2: string;
  bs113_0: string; // 자본총계
  bs113_1: string;
  bs113_2: string;
  pl01_0: string; // 매출액
  pl01_1: string;
  pl01_2: string;
  pl27_0: string; // 영업이익
  pl27_1: string;
  pl27_2: string;
  pl71_0: string; // 당기순이익
  pl71_1: string;
  pl71_2: string;
  
  // 재무비율
  TR0053: string; // 부채비율
  TR0052: string;
  TR0051: string;
  TR0513: string; // 차입금의존도
  TR0512: string;
  TR0511: string;
  TR0523: string; // 영업이익율
  TR0522: string;
  TR0521: string;
  TR0103: string; // 매출순이익율
  TR0102: string;
  TR0101: string;
  TR0223: string; // 매출액증가율
  TR0222: string;
  TR0221: string;
  TR0013: string; // 유동비율
  TR0012: string;
  TR0011: string;
}

interface CreditServiceResult {
  code: string;
  name: string;
  data: CreditData | null;
  dataCount: number;
  success: boolean;
  error: string | null;
}

export function useCreditIntegration(vendorId: string) {
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState<string | null>(null);
  const [creditResults, setCreditResults] = useState<CreditServiceResult[]>([]);
  const [selectedCreditService, setSelectedCreditService] = useState<string>('auto');
  const [bestResult, setBestResult] = useState<CreditServiceResult | null>(null);

  // 데이터 개수를 계산하는 함수
  const calculateDataCount = (data: CreditData | null): number => {
    if (!data) return 0;
    
    let count = 0;
    const fieldsToCheck = [
      // 재무현황 필드들
      'bs59_0', 'bs59_1', 'bs59_2', // 총자산
      'bs91_0', 'bs91_1', 'bs91_2', // 부채총계
      'bs113_0', 'bs113_1', 'bs113_2', // 자본총계
      'pl01_0', 'pl01_1', 'pl01_2', // 매출액
      'pl27_0', 'pl27_1', 'pl27_2', // 영업이익
      'pl71_0', 'pl71_1', 'pl71_2', // 당기순이익
      // 재무비율 필드들
      'TR0053', 'TR0052', 'TR0051', // 부채비율
      'TR0513', 'TR0512', 'TR0511', // 차입금의존도
      'TR0523', 'TR0522', 'TR0521', // 영업이익율
      'TR0103', 'TR0102', 'TR0101', // 순이익율
      'TR0223', 'TR0222', 'TR0221', // 매출액증가율
      'TR0013', 'TR0012', 'TR0011', // 유동비율
    ];

    fieldsToCheck.forEach(field => {
      const value = data[field as keyof CreditData];
      // null/undefined 또는 공백이 아닌 값은 모두 유효로 간주 ("0" 포함)
      if (value !== null && value !== undefined && value.toString().trim() !== '') {
        count++;
      }
    });

    return count;
  };

  // 모든 신용평가사 데이터를 병렬로 조회
  const loadAllCreditData = useCallback(async () => {
    if (!vendorId) return;
    
    setLoading(true);
    setError(null);

    try {
      const promises = creditServices.map(async (service) => {
        try {
          const result = await getCreditInfo(vendorId, service.code);
          const data = result && result.length > 0 ? result[0] : null;
          const dataCount = calculateDataCount(data);
          
          return {
            code: service.code,
            name: service.name,
            data,
            dataCount,
            success: true,
            error: null
          };
        } catch (err) {
          console.error(`Error loading credit data for ${service.name}:`, err);
          return {
            code: service.code,
            name: service.name,
            data: null,
            dataCount: 0,
            success: false,
            error: `${service.name} 데이터 조회 실패`
          };
        }
      });

      const results = await Promise.all(promises);
      setCreditResults(results);

      // 모든 신용평가사 조회가 실패했는지 확인
      const allFailed = results.every(result => !result.success);
      if (allFailed) {
        const failedServices = results.filter(r => !r.success).map(r => r.name).join(', ');
        setError(`모든 신용평가사 데이터 조회에 실패했습니다: ${failedServices}`);
        setBestResult(null);
        return;
      }

      // 부분적으로 실패한 경우에도 성공한 것들로 진행
      const successfulResults = results.filter(result => result.success);
      
      // 데이터 개수가 가장 많은 결과 찾기 (성공한 것들 중에서)
      const best = successfulResults.reduce((prev, current) => {
        return current.dataCount > prev.dataCount ? current : prev;
      }, successfulResults[0]);
      
      setBestResult(best && best.dataCount > 0 ? best : null);

      // 성공했지만 모든 데이터가 비어있는 경우
      if (successfulResults.length > 0 && successfulResults.every(r => r.dataCount === 0)) {
        setError(null); // 오류는 아니므로 에러 메시지 지우기
      }

    } catch (err) {
      setError('신용평가 데이터를 불러오는 중 예상치 못한 오류가 발생했습니다.');
      console.error(err);
      setBestResult(null);
    } finally {
      setLoading(false);
    }
  }, [vendorId]);

  // 신용평가사 선택 변경 핸들러
  const handleCreditServiceChange = (code: string) => {
    setSelectedCreditService(code);
  };

  // 현재 선택된 결과 반환
  const getCurrentResult = (): CreditServiceResult | null => {
    if (selectedCreditService === 'auto') {
      return bestResult;
    }
    return creditResults.find(r => r.code === selectedCreditService) || null;
  };

  // Credit 데이터를 Basic 페이지 형식으로 변환
  const transformCreditToSalesData = (creditData: CreditData | null) => {
    if (!creditData) return null;

    // 날짜 변환 함수 (20.12.31 -> 20201231)
    const convertDateToYYYYMMDD = (dateStr: string): string => {
      if (!dateStr) return '';
      const parts = dateStr.split('.');
      if (parts.length >= 3) {
        let year = parseInt(parts[0]);
        const month = parts[1].padStart(2, '0');
        const day = parts[2].padStart(2, '0');
        
        // 2자리 연도를 4자리로 변환
        if (year >= 0 && year <= 30) {
          year = 2000 + year;
        } else if (year >= 70 && year <= 99) {
          year = 1900 + year;
        }
        
        return `${year}${month}${day}`;
      }
      return '';
    };

    // 숫자 값 정리 함수
    const cleanNumber = (value: string): string => {
      if (!value) return '0';
      return value.replace(/,/g, '').trim();
    };

    const salesInfo: { [year: string]: { totalSales: string; totalDebt: string; totalEquity: string; operatingProfit: string; netIncome: string; } } = {};
    const calculatedMetrics: { [year: string]: { debtRatio: number; borrowingDependency: number; operatingMargin: number; netMargin: number; salesGrowth: number; currentRatio: number; } } = {};

    // 3개년 데이터 변환
    for (let i = 0; i < 3; i++) {
      const yearKey = convertDateToYYYYMMDD(creditData[`bs_dt${i}` as keyof CreditData] as string);
      if (!yearKey) continue;

      // 매출정보 변환
      salesInfo[yearKey] = {
        totalSales: cleanNumber(creditData[`pl01_${i}` as keyof CreditData] as string),
        totalDebt: cleanNumber(creditData[`bs91_${i}` as keyof CreditData] as string),
        totalEquity: cleanNumber(creditData[`bs113_${i}` as keyof CreditData] as string),
        operatingProfit: cleanNumber(creditData[`pl27_${i}` as keyof CreditData] as string),
        netIncome: cleanNumber(creditData[`pl71_${i}` as keyof CreditData] as string),
      };

      // 계산된 지표 변환 (i=0은 최신년도, i=2는 가장 오래된 년도)
      calculatedMetrics[yearKey] = {
        debtRatio: parseFloat(creditData[`TR005${3-i}` as keyof CreditData] as string) || 0,  // TR0053, TR0052, TR0051
        borrowingDependency: parseFloat(creditData[`TR051${3-i}` as keyof CreditData] as string) || 0,  // TR0513, TR0512, TR0511
        operatingMargin: parseFloat(creditData[`TR052${3-i}` as keyof CreditData] as string) || 0,  // TR0523, TR0522, TR0521
        netMargin: parseFloat(creditData[`TR010${3-i}` as keyof CreditData] as string) || 0,  // TR0103, TR0102, TR0101
        salesGrowth: parseFloat(creditData[`TR022${3-i}` as keyof CreditData] as string) || 0,  // TR0223, TR0222, TR0221
        currentRatio: parseFloat(creditData[`TR001${3-i}` as keyof CreditData] as string) || 0,  // TR0013, TR0012, TR0011
      };
    }

    return { salesInfo, calculatedMetrics };
  };

  // 초기 데이터 로드
  useEffect(() => {
    if (vendorId) {
      loadAllCreditData();
    }
  }, [vendorId, loadAllCreditData]);

  return {
    loading,
    error,
    creditResults,
    selectedCreditService,
    bestResult,
    getCurrentResult,
    handleCreditServiceChange,
    transformCreditToSalesData,
    creditServices: [...creditServices, { code: 'auto', name: '자동선택 (최적)' }],
    reload: loadAllCreditData
  };
}