'use server';

/**
 * CEO Dashboard API 엔드포인트 함수
 *
 * 카드/가지급금 관리 섹션 (cm1-cm4) 데이터 조회
 */

import { apiClient } from '../index';
import { isNextRedirectError } from '@/lib/utils/redirect-error';
import type {
  ApiResponse,
  CardDashboardDetailApiResponse,
  LoanDashboardApiResponse,
  TaxSimulationApiResponse,
} from './types';

// ============================================
// 에러 핸들링 헬퍼
// ============================================

/**
 * 인증 에러인지 확인
 */
function isAuthenticationError(error: unknown): boolean {
  if (error && typeof error === 'object') {
    const err = error as { status?: number; code?: string; message?: string };
    if (err.status === 401) return true;
    if (err.code === 'AUTH_ERROR') return true;
    if (err.message?.includes('회원정보') || err.message?.includes('인증')) return true;
  }
  return false;
}

// ============================================
// 카드 거래 대시보드 API
// ============================================

/**
 * 카드 거래 대시보드 데이터 조회
 * GET /api/v1/card-transactions/dashboard
 *
 * @returns 카드 거래 요약, 월별 추이, 사용자별 분포, 거래 목록
 */
export async function fetchCardTransactionDashboard(): Promise<ApiResponse<CardDashboardDetailApiResponse>> {
  try {
    const response = await apiClient.get<ApiResponse<CardDashboardDetailApiResponse>>(
      '/card-transactions/dashboard'
    );
    return response;
  } catch (error) {
    // Next.js redirect 에러는 전파
    if (isNextRedirectError(error)) {
      throw error;
    }

    console.error('[Dashboard] fetchCardTransactionDashboard error:', error);

    // 인증 에러인 경우
    if (isAuthenticationError(error)) {
      return {
        success: false,
        message: '인증이 만료되었습니다.',
        data: {
          summary: {
            current_month_total: 0,
            previous_month_total: 0,
            total_count: 0,
            current_month_count: 0,
          },
          monthly_trend: [],
          by_user: [],
          items: [],
        },
      };
    }

    // 기타 에러
    return {
      success: false,
      message: error instanceof Error ? error.message : 'API 요청 실패',
      data: {
        summary: {
          current_month_total: 0,
          previous_month_total: 0,
          total_count: 0,
          current_month_count: 0,
        },
        monthly_trend: [],
        by_user: [],
        items: [],
      },
    };
  }
}

// ============================================
// 가지급금 대시보드 API
// ============================================

/**
 * 가지급금 대시보드 데이터 조회
 * GET /api/v1/loans/dashboard
 *
 * @returns 가지급금 요약, 월별 추이, 사용자별 분포, 거래 목록
 */
export async function fetchLoanDashboard(): Promise<ApiResponse<LoanDashboardApiResponse>> {
  try {
    const response = await apiClient.get<ApiResponse<LoanDashboardApiResponse>>(
      '/loans/dashboard'
    );
    return response;
  } catch (error) {
    // Next.js redirect 에러는 전파
    if (isNextRedirectError(error)) {
      throw error;
    }

    console.error('[Dashboard] fetchLoanDashboard error:', error);

    // 인증 에러인 경우
    if (isAuthenticationError(error)) {
      return {
        success: false,
        message: '인증이 만료되었습니다.',
        data: {
          summary: {
            total_outstanding: 0,
            settled_amount: 0,
            recognized_interest: 0,
            pending_count: 0,
          },
          monthly_trend: [],
          user_distribution: [],
          items: [],
        },
      };
    }

    // 기타 에러
    return {
      success: false,
      message: error instanceof Error ? error.message : 'API 요청 실패',
      data: {
        summary: {
          total_outstanding: 0,
          settled_amount: 0,
          recognized_interest: 0,
          pending_count: 0,
        },
        monthly_trend: [],
        user_distribution: [],
        items: [],
      },
    };
  }
}

// ============================================
// 세금 시뮬레이션 API
// ============================================

/**
 * 세금 시뮬레이션 데이터 조회
 * GET /api/v1/loans/tax-simulation?year={year}
 *
 * @param year - 시뮬레이션 연도 (기본값: 현재 연도)
 * @returns 가지급금 요약, 법인세 비교, 소득세 비교
 */
export async function fetchTaxSimulation(year?: number): Promise<ApiResponse<TaxSimulationApiResponse>> {
  try {
    const targetYear = year || new Date().getFullYear();
    const response = await apiClient.get<ApiResponse<TaxSimulationApiResponse>>(
      '/loans/tax-simulation',
      { params: { year: String(targetYear) } }
    );
    return response;
  } catch (error) {
    // Next.js redirect 에러는 전파
    if (isNextRedirectError(error)) {
      throw error;
    }

    console.error('[Dashboard] fetchTaxSimulation error:', error);

    const currentYear = year || new Date().getFullYear();

    // 인증 에러인 경우
    if (isAuthenticationError(error)) {
      return {
        success: false,
        message: '인증이 만료되었습니다.',
        data: {
          year: currentYear,
          loan_summary: {
            total_outstanding: 0,
            recognized_interest: 0,
            interest_rate: 0.046,
          },
          corporate_tax: {
            without_loan: { taxable_income: 0, tax_amount: 0 },
            with_loan: { taxable_income: 0, tax_amount: 0 },
            difference: 0,
            rate_info: '법인세 19% 적용',
          },
          income_tax: {
            without_loan: { taxable_income: 0, tax_rate: '0%', tax_amount: 0 },
            with_loan: { taxable_income: 0, tax_rate: '35%', tax_amount: 0 },
            difference: 0,
            breakdown: { income_tax: 0, local_tax: 0, insurance: 0 },
          },
        },
      };
    }

    // 기타 에러
    return {
      success: false,
      message: error instanceof Error ? error.message : 'API 요청 실패',
      data: {
        year: currentYear,
        loan_summary: {
          total_outstanding: 0,
          recognized_interest: 0,
          interest_rate: 0.046,
        },
        corporate_tax: {
          without_loan: { taxable_income: 0, tax_amount: 0 },
          with_loan: { taxable_income: 0, tax_amount: 0 },
          difference: 0,
          rate_info: '법인세 19% 적용',
        },
        income_tax: {
          without_loan: { taxable_income: 0, tax_rate: '0%', tax_amount: 0 },
          with_loan: { taxable_income: 0, tax_rate: '35%', tax_amount: 0 },
          difference: 0,
          breakdown: { income_tax: 0, local_tax: 0, insurance: 0 },
        },
      },
    };
  }
}