/**
 * CEO Dashboard API 응답 → Frontend 타입 변환 함수
 *
 * 참조: docs/plans/AI_리포트_키워드_색상체계_가이드_v1.4.md
 */

import type {
  DailyReportApiResponse,
  ReceivablesApiResponse,
  BadDebtApiResponse,
  ExpectedExpenseApiResponse,
  CardTransactionApiResponse,
} from './types';

import type {
  DailyReportData,
  ReceivableData,
  DebtCollectionData,
  MonthlyExpenseData,
  CardManagementData,
  CheckPoint,
  CheckPointType,
} from '@/components/business/CEODashboard/types';

// ============================================
// 헬퍼 함수
// ============================================

/**
 * 금액 포맷팅
 * @example formatAmount(3050000000) → "30.5억원"
 */
function formatAmount(amount: number): string {
  const absAmount = Math.abs(amount);
  if (absAmount >= 100000000) {
    return `${(amount / 100000000).toFixed(1)}억원`;
  } else if (absAmount >= 10000) {
    return `${Math.round(amount / 10000).toLocaleString()}만원`;
  }
  return `${amount.toLocaleString()}원`;
}

/**
 * 날짜 포맷팅 (API → 한국어 형식)
 * @example formatDate("2026-01-20", "월요일") → "2026년 1월 20일 월요일"
 */
function formatDate(dateStr: string, dayOfWeek: string): string {
  const date = new Date(dateStr);
  return `${date.getFullYear()}년 ${date.getMonth() + 1}월 ${date.getDate()}일 ${dayOfWeek}`;
}

/**
 * 퍼센트 변화율 계산
 */
function calculateChangeRate(current: number, previous: number): number {
  if (previous === 0) return current > 0 ? 100 : 0;
  return ((current - previous) / previous) * 100;
}

// ============================================
// 1. DailyReport 변환
// ============================================

/**
 * 일일 일보 CheckPoints 생성
 * 참조: AI 리포트 색상 체계 가이드 - 섹션 2
 */
function generateDailyReportCheckPoints(api: DailyReportApiResponse): CheckPoint[] {
  const checkPoints: CheckPoint[] = [];

  // 출금 정보
  const withdrawal = api.krw_totals.expense;
  if (withdrawal > 0) {
    checkPoints.push({
      id: 'dr-withdrawal',
      type: 'info' as CheckPointType,
      message: `어제 ${formatAmount(withdrawal)} 출금했습니다.`,
      highlights: [
        { text: formatAmount(withdrawal), color: 'red' as const },
      ],
    });
  }

  // 입금 정보
  const deposit = api.krw_totals.income;
  if (deposit > 0) {
    checkPoints.push({
      id: 'dr-deposit',
      type: 'success' as CheckPointType,
      message: `어제 ${formatAmount(deposit)}이 입금되었습니다.`,
      highlights: [
        { text: formatAmount(deposit), color: 'green' as const },
        { text: '입금', color: 'green' as const },
      ],
    });
  }

  // 현금성 자산 현황
  const cashAsset = api.cash_asset_total;
  checkPoints.push({
    id: 'dr-cash-asset',
    type: 'info' as CheckPointType,
    message: `총 현금성 자산이 ${formatAmount(cashAsset)}입니다.`,
    highlights: [
      { text: formatAmount(cashAsset), color: 'blue' as const },
    ],
  });

  return checkPoints;
}

/**
 * DailyReport API 응답 → Frontend 타입 변환
 */
export function transformDailyReportResponse(api: DailyReportApiResponse): DailyReportData {
  return {
    date: formatDate(api.date, api.day_of_week),
    cards: [
      {
        id: 'dr1',
        label: '현금성 자산 합계',
        amount: api.cash_asset_total,
      },
      {
        id: 'dr2',
        label: '외국환(USD) 합계',
        amount: api.foreign_currency_total,
        currency: 'USD',
      },
      {
        id: 'dr3',
        label: '입금 합계',
        amount: api.krw_totals.income,
      },
      {
        id: 'dr4',
        label: '출금 합계',
        amount: api.krw_totals.expense,
      },
    ],
    checkPoints: generateDailyReportCheckPoints(api),
  };
}

// ============================================
// 2. Receivable 변환
// ============================================

/**
 * 미수금 현황 CheckPoints 생성
 */
function generateReceivableCheckPoints(api: ReceivablesApiResponse): CheckPoint[] {
  const checkPoints: CheckPoint[] = [];

  // 연체 거래처 경고
  if (api.overdue_vendor_count > 0) {
    checkPoints.push({
      id: 'rv-overdue',
      type: 'warning' as CheckPointType,
      message: `연체 거래처 ${api.overdue_vendor_count}곳. 회수 조치가 필요합니다.`,
      highlights: [
        { text: `연체 거래처 ${api.overdue_vendor_count}곳`, color: 'red' as const },
      ],
    });
  }

  // 미수금 현황
  if (api.total_receivables > 0) {
    checkPoints.push({
      id: 'rv-total',
      type: 'info' as CheckPointType,
      message: `총 미수금 ${formatAmount(api.total_receivables)}입니다.`,
      highlights: [
        { text: formatAmount(api.total_receivables), color: 'blue' as const },
      ],
    });
  }

  return checkPoints;
}

/**
 * Receivables API 응답 → Frontend 타입 변환
 */
export function transformReceivableResponse(api: ReceivablesApiResponse): ReceivableData {
  // 누적 미수금 = 이월 + 매출 - 입금
  const cumulativeReceivable = api.total_carry_forward + api.total_sales - api.total_deposits;

  return {
    cards: [
      {
        id: 'rv1',
        label: '누적 미수금',
        amount: cumulativeReceivable,
        subItems: [
          { label: '이월', value: api.total_carry_forward },
          { label: '매출', value: api.total_sales },
          { label: '입금', value: api.total_deposits },
        ],
      },
      {
        id: 'rv2',
        label: '당월 미수금',
        amount: api.total_receivables,
        subItems: [
          { label: '매출', value: api.total_sales },
          { label: '입금', value: api.total_deposits },
        ],
      },
      {
        id: 'rv3',
        label: '거래처 현황',
        amount: api.vendor_count,
        unit: '곳',
        subLabel: `연체 ${api.overdue_vendor_count}곳`,
      },
    ],
    checkPoints: generateReceivableCheckPoints(api),
    detailButtonLabel: '미수금 상세',
    detailButtonPath: '/accounting/receivables-status',
  };
}

// ============================================
// 3. DebtCollection 변환
// ============================================

/**
 * 채권추심 CheckPoints 생성
 */
function generateDebtCollectionCheckPoints(api: BadDebtApiResponse): CheckPoint[] {
  const checkPoints: CheckPoint[] = [];

  // 법적조치 진행 중
  if (api.legal_action_amount > 0) {
    checkPoints.push({
      id: 'dc-legal',
      type: 'warning' as CheckPointType,
      message: `법적조치 진행 중 ${formatAmount(api.legal_action_amount)}입니다.`,
      highlights: [
        { text: formatAmount(api.legal_action_amount), color: 'red' as const },
      ],
    });
  }

  // 회수 완료
  if (api.recovered_amount > 0) {
    checkPoints.push({
      id: 'dc-recovered',
      type: 'success' as CheckPointType,
      message: `총 ${formatAmount(api.recovered_amount)}을 회수 완료했습니다.`,
      highlights: [
        { text: formatAmount(api.recovered_amount), color: 'green' as const },
        { text: '회수 완료', color: 'green' as const },
      ],
    });
  }

  return checkPoints;
}

/**
 * BadDebt API 응답 → Frontend 타입 변환
 */
export function transformDebtCollectionResponse(api: BadDebtApiResponse): DebtCollectionData {
  return {
    cards: [
      {
        id: 'dc1',
        label: '누적 악성채권',
        amount: api.total_amount,
      },
      {
        id: 'dc2',
        label: '추심중',
        amount: api.collecting_amount,
      },
      {
        id: 'dc3',
        label: '법적조치',
        amount: api.legal_action_amount,
      },
      {
        id: 'dc4',
        label: '회수완료',
        amount: api.recovered_amount,
      },
    ],
    checkPoints: generateDebtCollectionCheckPoints(api),
    detailButtonPath: '/accounting/bad-debt-collection',
  };
}

// ============================================
// 4. MonthlyExpense 변환
// ============================================

/**
 * 당월 예상 지출 CheckPoints 생성
 */
function generateMonthlyExpenseCheckPoints(api: ExpectedExpenseApiResponse): CheckPoint[] {
  const checkPoints: CheckPoint[] = [];

  // 총 예상 지출
  checkPoints.push({
    id: 'me-total',
    type: 'info' as CheckPointType,
    message: `이번 달 예상 지출은 ${formatAmount(api.total_amount)}입니다.`,
    highlights: [
      { text: formatAmount(api.total_amount), color: 'blue' as const },
    ],
  });

  return checkPoints;
}

/**
 * ExpectedExpense API 응답 → Frontend 타입 변환
 * 주의: 실제 API는 상세 분류(매입/카드/어음 등)를 제공하지 않음
 * by_transaction_type에서 추출하거나 기본값 사용
 */
export function transformMonthlyExpenseResponse(api: ExpectedExpenseApiResponse): MonthlyExpenseData {
  // transaction_type별 금액 추출
  const purchaseTotal = api.by_transaction_type['purchase']?.total ?? 0;
  const cardTotal = api.by_transaction_type['card']?.total ?? 0;
  const billTotal = api.by_transaction_type['bill']?.total ?? 0;

  return {
    cards: [
      {
        id: 'me1',
        label: '매입',
        amount: purchaseTotal,
      },
      {
        id: 'me2',
        label: '카드',
        amount: cardTotal,
      },
      {
        id: 'me3',
        label: '발행어음',
        amount: billTotal,
      },
      {
        id: 'me4',
        label: '총 예상 지출 합계',
        amount: api.total_amount,
      },
    ],
    checkPoints: generateMonthlyExpenseCheckPoints(api),
  };
}

// ============================================
// 5. CardManagement 변환
// ============================================

/**
 * 카드/가지급금 CheckPoints 생성
 */
function generateCardManagementCheckPoints(api: CardTransactionApiResponse): CheckPoint[] {
  const checkPoints: CheckPoint[] = [];

  // 전월 대비 변화
  const changeRate = calculateChangeRate(api.current_month_total, api.previous_month_total);
  if (Math.abs(changeRate) > 10) {
    const type: CheckPointType = changeRate > 0 ? 'warning' : 'info';
    checkPoints.push({
      id: 'cm-change',
      type,
      message: `당월 카드 사용액이 전월 대비 ${changeRate > 0 ? '+' : ''}${changeRate.toFixed(1)}% 변동했습니다.`,
      highlights: [
        { text: `${changeRate > 0 ? '+' : ''}${changeRate.toFixed(1)}%`, color: changeRate > 0 ? 'red' as const : 'green' as const },
      ],
    });
  }

  // 당월 사용액
  checkPoints.push({
    id: 'cm-current',
    type: 'info' as CheckPointType,
    message: `당월 카드 사용 총 ${formatAmount(api.current_month_total)}입니다.`,
    highlights: [
      { text: formatAmount(api.current_month_total), color: 'blue' as const },
    ],
  });

  return checkPoints;
}

/**
 * CardTransaction API 응답 → Frontend 타입 변환
 * 주의: 가지급금, 법인세 예상 가중 등은 별도 API 필요 (현재 목업 유지)
 */
export function transformCardManagementResponse(
  api: CardTransactionApiResponse,
  fallbackData?: CardManagementData
): CardManagementData {
  const changeRate = calculateChangeRate(api.current_month_total, api.previous_month_total);

  return {
    // 가지급금 관련 경고는 API 데이터가 없으므로 fallback 사용
    warningBanner: fallbackData?.warningBanner,
    cards: [
      {
        id: 'cm1',
        label: '카드',
        amount: api.current_month_total,
        previousLabel: `전월 대비 ${changeRate > 0 ? '+' : ''}${changeRate.toFixed(1)}%`,
      },
      // 아래 항목들은 API에서 제공하지 않으므로 fallback 사용
      fallbackData?.cards[1] ?? {
        id: 'cm2',
        label: '가지급금',
        amount: 0,
      },
      fallbackData?.cards[2] ?? {
        id: 'cm3',
        label: '법인세 예상 가중',
        amount: 0,
      },
      fallbackData?.cards[3] ?? {
        id: 'cm4',
        label: '대표자 종합세 예상 가중',
        amount: 0,
      },
    ],
    checkPoints: generateCardManagementCheckPoints(api),
  };
}