/**
 * 📄 API Utility
 * API 호출 유틸리티 파일
 *
 * - 다양한 HTTP 메소드의 API 호출 함수 (GET, POST, PUT, DELETE)
 * - 쿠키 기반 인증 토큰 관리 및 사용자 조회
 * - 특정 서비스 (DC, CMS, GeoServer) 호출 지원
 * - Axios 및 Fetch 기반 HTTP 요청 처리
 * - 타입 안전성 보장을 위한 인터페이스 활용
 * - 에러 핸들링 및 응답 처리 표준화
 */
import { useEffect, useState } from "react";
import axios from 'axios';
import { AxiosError } from 'axios';
import { CLAIM_NAME, SITE_ID } from "@/shared/config";
import { tokenManager } from "@/entities/auth/lib/token-manager";
import { getRemainingMs } from "@common/auth";
// 기존 shared/api barrel의 인증 client 초기화 부수효과를 불러오지 않는 순수 transport다.
import { createHttpTransport } from "@/shared/api/http-transport";

const BASE_URL = '/sewerage-service/api';
const DEFAULT_HEADERS = {
  "X-Site-Id": SITE_ID,
};
const LOGIN_PAGE_URL =
  process.env.NEXT_PUBLIC_CM_LOGIN_PAGE_URL || "/auth/login";

const withSiteIdHeaders = (headers: HeadersInit = {}) => ({
  ...headers,
  ...DEFAULT_HEADERS,
});

const resolveApiUrl = (url: string) =>
  url.startsWith('/') ? `${url}` : `${BASE_URL}/${url}`;

const handleUnauthorizedResponse = () => {
  if (typeof window === "undefined") return;

  const accessToken = tokenManager.getToken(CLAIM_NAME);
  const remainingMs = accessToken ? getRemainingMs(accessToken) : null;
  const isExpired = remainingMs === null || remainingMs <= 0;

  if (!isExpired) return;

  tokenManager.clearAuthToken();

  const isLoginPage =
    window.location.pathname === "/auth/login" ||
    window.location.pathname.startsWith("/auth/login/");

  if (!isLoginPage) {
    window.location.assign(LOGIN_PAGE_URL);
  }
};

// 기존 import 경로를 유지하는 호환 진입점이다. HTTP 처리는 shared/api가 소유한다.
const httpTransport = createHttpTransport({
  baseUrl: BASE_URL,
  headers: DEFAULT_HEADERS,
  onUnauthorized: handleUnauthorizedResponse,
});
export const { getData, postData, putData, getRawJson, postRawJson, deleteData } =
  httpTransport;

const parseDownloadFileName = (contentDisposition: string | null) => {
  if (!contentDisposition) return undefined;

  const utf8Match = contentDisposition.match(/filename\*\s*=\s*UTF-8''([^;]+)/i);
  if (utf8Match?.[1]) {
    return decodeURIComponent(utf8Match[1].trim());
  }

  const plainMatch = contentDisposition.match(/filename\s*=\s*"?([^\";]+)"?/i);
  return plainMatch?.[1]?.trim();
};

export const postBlobData = async (
  url: string,
  data: object,
): Promise<{ blob: Blob; fileName?: string }> => {
  const res = await fetch(resolveApiUrl(url), {
    method: "POST",
    headers: withSiteIdHeaders({
      "Content-Type": "application/json",
    }),
    body: JSON.stringify(data),
  });
  if (res.status === 401) {
    handleUnauthorizedResponse();
  }

  if (!res.ok) {
    const errorText = await res.text().catch(() => "");
    throw new Error(
      `Failed to fetch blob: ${res.status} ${res.statusText}${errorText ? ` - ${errorText.slice(0, 200)}` : ""} (${url})`,
    );
  }

  return {
    blob: await res.blob(),
    fileName: parseDownloadFileName(res.headers.get("content-disposition")),
  };
};

export const postMutiPart = async (url: string, data: FormData): Promise<any> => {
  try {
    const res = await axios.post(resolveApiUrl(url), data, {
      headers: DEFAULT_HEADERS,
      timeout: 600000, // 10분
    });
    console.log('postMultiPart response:', res);
    return res.data.data;
  } catch (error) {
    if (error instanceof AxiosError) {
      const responseBody = error.response?.data;
      const serverMessage =
        typeof responseBody?.message === 'string' && responseBody.message.trim()
          ? responseBody.message.trim()
          : typeof responseBody?.error?.message === 'string' && responseBody.error.message.trim()
            ? responseBody.error.message.trim()
            : typeof responseBody === 'string' && responseBody.trim()
              ? responseBody.trim()
              : null;

      const nextError = new Error(
        serverMessage ?? `Multipart request failed: ${error.response?.status ?? 'UNKNOWN'} ${error.response?.statusText ?? ''}`.trim(),
      ) as Error & { status?: number; body?: unknown };
      nextError.status = error.response?.status;
      nextError.body = responseBody;
      throw nextError;
    }
    throw error;
  }
};

export const getBlobData = async (url: string): Promise<Blob> => {
  const res = await fetch(resolveApiUrl(url), {
    method: "GET",
    headers: withSiteIdHeaders(),
  });
  if (res.status === 401) {
    handleUnauthorizedResponse();
  }

  if (!res.ok) {
    const errorText = await res.text().catch(() => "");
    throw new Error(
      `Failed to fetch blob: ${res.status} ${res.statusText}${errorText ? ` - ${errorText.slice(0, 200)}` : ""} (${url})`,
    );
  }

  return res.blob();
};

export const getBlobDataWithHeaders = async (
  url: string,
): Promise<{ blob: Blob; fileName?: string; headers: Headers }> => {
  const res = await fetch(resolveApiUrl(url), {
    method: "GET",
    headers: withSiteIdHeaders(),
  });
  if (res.status === 401) {
    handleUnauthorizedResponse();
  }

  if (!res.ok) {
    const errorText = await res.text().catch(() => "");
    throw new Error(
      `Failed to fetch blob: ${res.status} ${res.statusText}${errorText ? ` - ${errorText.slice(0, 200)}` : ""} (${url})`,
    );
  }

  return {
    blob: await res.blob(),
    fileName: parseDownloadFileName(res.headers.get("content-disposition")),
    headers: res.headers,
  };
};

// DC API 호출
export const getDcData = async (url: string, resType: string = "json"): Promise<any> => {
  const res = await fetch('/dc-service' + url, {
    method: "GET",
    headers: withSiteIdHeaders(),
  });
  if (res.status === 401) {
    handleUnauthorizedResponse();
  }
  if (res.ok) {
    let data;
    if (resType === "json") data = await res.json();
    else if (resType === "blob") data = await res.blob();
    
    return data;
  }
  throw new Error('Failed to fetch data');
};

// CMS API 호출
export const getCmsData = async (url: string, data?: object): Promise<any> => {
  const res = await fetch('/cms-service' + url, {
    method: "GET",
    headers: withSiteIdHeaders(),
  });
  if (res.status === 401) {
    handleUnauthorizedResponse();
  }
  if (res.ok) {
    const data = await res.json();
    return data;
  }
  throw new Error('Failed to fetch data');
};

// GeoServer API 호출
export const getGeoData = async (url: string, data?: object): Promise<any> => {
  const res = await fetch('/geoserver' + url, {
    method: "GET",
    headers: withSiteIdHeaders(),
  });
  if (res.status === 401) {
    handleUnauthorizedResponse();
  }
  if (res.ok) {
    const data = await res.json();
    return data;
  }
  throw new Error('Failed to fetch data');
};

export function getCookie(name: string) {
  const match = document.cookie.match(new RegExp('(^| )' + name + '=([^;]+)'));
  if (match && match[2]) {
    return decodeURIComponent(match[2]);
  }
  return null;
}

export const useCookieAuth = () => {
  const [data, setData] = useState("");

  useEffect(() => {
    const fetch = async () => {
      const result = getCookie("Authorization");
      if (result) {
        setData(result);
      }
    };
    fetch();
    console.log("useCookieAuth 호출");
  }, []);

  return data;
};