'use server';

import { serverFetch } from '@/lib/api/fetch-wrapper';
import type { BankTransaction, TransactionKind } from './types';

// ===== API 응답 타입 =====
interface BankTransactionApiItem {
  id: number;
  type: 'deposit' | 'withdrawal';
  transaction_date: string;
  bank_account_id: number;
  bank_name: string;
  account_name: string;
  note: string | null;
  vendor_id: number | null;
  vendor_name: string | null;
  depositor_name: string | null;
  deposit_amount: number | string;
  withdrawal_amount: number | string;
  balance: number | string;
  transaction_type: string | null;
  source_id: string;
  created_at: string;
  updated_at: string;
}

interface BankTransactionApiSummary {
  total_deposit: number;
  total_withdrawal: number;
  deposit_unset_count: number;
  withdrawal_unset_count: number;
}

interface BankAccountOption {
  id: number;
  label: string;
}

interface PaginationMeta {
  current_page: number;
  last_page: number;
  per_page: number;
  total: number;
}

// ===== API → Frontend 변환 =====
function transformItem(item: BankTransactionApiItem): BankTransaction {
  return {
    id: String(item.id),
    bankName: item.bank_name,
    accountName: item.account_name,
    transactionDate: item.transaction_date,
    type: item.type as TransactionKind,
    note: item.note || undefined,
    vendorId: item.vendor_id ? String(item.vendor_id) : undefined,
    vendorName: item.vendor_name || undefined,
    depositorName: item.depositor_name || undefined,
    depositAmount: typeof item.deposit_amount === 'string' ? parseFloat(item.deposit_amount) : item.deposit_amount,
    withdrawalAmount: typeof item.withdrawal_amount === 'string' ? parseFloat(item.withdrawal_amount) : item.withdrawal_amount,
    balance: typeof item.balance === 'string' ? parseFloat(item.balance) : item.balance,
    transactionType: item.transaction_type || undefined,
    sourceId: item.source_id,
    createdAt: item.created_at,
    updatedAt: item.updated_at,
  };
}

// ===== 입출금 통합 목록 조회 =====
export async function getBankTransactionList(params?: {
  page?: number;
  perPage?: number;
  startDate?: string;
  endDate?: string;
  bankAccountId?: number;
  transactionType?: string;
  search?: string;
  sortBy?: string;
  sortDir?: 'asc' | 'desc';
}): Promise<{
  success: boolean;
  data: BankTransaction[];
  pagination: {
    currentPage: number;
    lastPage: number;
    perPage: number;
    total: number;
  };
  error?: string;
}> {
  try {
    const searchParams = new URLSearchParams();

    if (params?.page) searchParams.set('page', String(params.page));
    if (params?.perPage) searchParams.set('per_page', String(params.perPage));
    if (params?.startDate) searchParams.set('start_date', params.startDate);
    if (params?.endDate) searchParams.set('end_date', params.endDate);
    if (params?.bankAccountId) searchParams.set('bank_account_id', String(params.bankAccountId));
    if (params?.transactionType) searchParams.set('transaction_type', params.transactionType);
    if (params?.search) searchParams.set('search', params.search);
    if (params?.sortBy) searchParams.set('sort_by', params.sortBy);
    if (params?.sortDir) searchParams.set('sort_dir', params.sortDir);

    const queryString = searchParams.toString();
    const url = `${process.env.NEXT_PUBLIC_API_URL}/api/v1/bank-transactions${queryString ? `?${queryString}` : ''}`;

    const { response, error } = await serverFetch(url, { method: 'GET' });

    if (error) {
      return {
        success: false,
        data: [],
        pagination: { currentPage: 1, lastPage: 1, perPage: 20, total: 0 },
        error: error.message,
      };
    }

    if (!response?.ok) {
      console.warn('[BankTransactionActions] GET bank-transactions error:', response?.status);
      return {
        success: false,
        data: [],
        pagination: { currentPage: 1, lastPage: 1, perPage: 20, total: 0 },
        error: `API 오류: ${response?.status}`,
      };
    }

    const result = await response.json();

    if (!result.success) {
      return {
        success: false,
        data: [],
        pagination: { currentPage: 1, lastPage: 1, perPage: 20, total: 0 },
        error: result.message || '은행 거래 조회에 실패했습니다.',
      };
    }

    const paginationData = result.data;
    const items = (paginationData?.data || []).map(transformItem);
    const meta: PaginationMeta = {
      current_page: paginationData?.current_page || 1,
      last_page: paginationData?.last_page || 1,
      per_page: paginationData?.per_page || 20,
      total: paginationData?.total || items.length,
    };

    return {
      success: true,
      data: items,
      pagination: {
        currentPage: meta.current_page,
        lastPage: meta.last_page,
        perPage: meta.per_page,
        total: meta.total,
      },
    };
  } catch (error) {
    console.error('[BankTransactionActions] getBankTransactionList error:', error);
    return {
      success: false,
      data: [],
      pagination: { currentPage: 1, lastPage: 1, perPage: 20, total: 0 },
      error: '서버 오류가 발생했습니다.',
    };
  }
}

// ===== 입출금 요약 통계 =====
export async function getBankTransactionSummary(params?: {
  startDate?: string;
  endDate?: string;
}): Promise<{
  success: boolean;
  data?: {
    totalDeposit: number;
    totalWithdrawal: number;
    depositUnsetCount: number;
    withdrawalUnsetCount: number;
  };
  error?: string;
}> {
  try {
    const searchParams = new URLSearchParams();

    if (params?.startDate) searchParams.set('start_date', params.startDate);
    if (params?.endDate) searchParams.set('end_date', params.endDate);

    const queryString = searchParams.toString();
    const url = `${process.env.NEXT_PUBLIC_API_URL}/api/v1/bank-transactions/summary${queryString ? `?${queryString}` : ''}`;

    const { response, error } = await serverFetch(url, { method: 'GET' });

    if (error) {
      return { success: false, error: error.message };
    }

    if (!response?.ok) {
      console.warn('[BankTransactionActions] GET summary error:', response?.status);
      return {
        success: false,
        error: `API 오류: ${response?.status}`,
      };
    }

    const result = await response.json();

    if (!result.success) {
      return {
        success: false,
        error: result.message || '요약 조회에 실패했습니다.',
      };
    }

    const apiSummary: BankTransactionApiSummary = result.data;

    return {
      success: true,
      data: {
        totalDeposit: apiSummary.total_deposit,
        totalWithdrawal: apiSummary.total_withdrawal,
        depositUnsetCount: apiSummary.deposit_unset_count,
        withdrawalUnsetCount: apiSummary.withdrawal_unset_count,
      },
    };
  } catch (error) {
    console.error('[BankTransactionActions] getBankTransactionSummary error:', error);
    return {
      success: false,
      error: '서버 오류가 발생했습니다.',
    };
  }
}

// ===== 계좌 목록 조회 (필터용) =====
export async function getBankAccountOptions(): Promise<{
  success: boolean;
  data: { id: number; label: string }[];
  error?: string;
}> {
  try {
    const url = `${process.env.NEXT_PUBLIC_API_URL}/api/v1/bank-transactions/accounts`;

    const { response, error } = await serverFetch(url, { method: 'GET' });

    if (error) {
      return { success: false, data: [], error: error.message };
    }

    if (!response?.ok) {
      console.warn('[BankTransactionActions] GET accounts error:', response?.status);
      return {
        success: false,
        data: [],
        error: `API 오류: ${response?.status}`,
      };
    }

    const result = await response.json();

    if (!result.success) {
      return {
        success: false,
        data: [],
        error: result.message || '계좌 목록 조회에 실패했습니다.',
      };
    }

    return {
      success: true,
      data: result.data as BankAccountOption[],
    };
  } catch (error) {
    console.error('[BankTransactionActions] getBankAccountOptions error:', error);
    return {
      success: false,
      data: [],
      error: '서버 오류가 발생했습니다.',
    };
  }
}