/**
 * 📄 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 { CLAIM_NAME, SITE_ID } from "@/shared/config";
import { tokenManager } from "@/entities/auth/lib/token-manager";

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 remainingMs = tokenManager.getRemainingMsFromToken(CLAIM_NAME);
  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);
  }
};

export const getData = async (url: string): Promise<any> => {
  const res = await fetch(resolveApiUrl(url), {
    method: "GET",
    headers: withSiteIdHeaders(),
  });
  if (res.status === 401) {
    handleUnauthorizedResponse();
  }
  if (res.ok) {
    try {
      // 응답이 비어있는지 확인
      const contentLength = res.headers.get('content-length');
      if (contentLength === '0') {
        return null;
      }

      // 응답 텍스트를 먼저 가져와서 빈 문자열인지 확인
      const text = await res.text();
      if (!text || text.trim() === '') {
        return null;
      }

      // JSON 파싱 시도
      const data = JSON.parse(text);
      return data.data;
    } catch (error) {
      console.error('JSON parsing error:', error);
      // JSON 파싱에 실패한 경우, 원본 텍스트 또는 null 반환
      throw new Error('Invalid JSON response from server');
    }
  }
  throw new Error('Failed to fetch data');
};

export const postData = async (url: string, data: object): Promise<any> => {
  const options: RequestInit = {
    method: "POST",
    headers: withSiteIdHeaders({
      "Content-Type": "application/json",
    }),
    body: JSON.stringify(data),
  };
  const res = await fetch(`${BASE_URL}/${url}`, options);
  if (res.status === 401) {
    handleUnauthorizedResponse();
  }
  if (res.ok) {
    const resData = await res.json();
    console.log('postData response:', resData);
    return resData.data;
  }
};

export const postMutiPart = async (url: string, data: FormData): Promise<any> => {
  const res = await axios.post(`${BASE_URL}/${url}`, data, {
    headers: DEFAULT_HEADERS,
    timeout: 600000, // 10분
  });
  console.log('postMultiPart response:', res);
  return res.data.data;
};

export const putData = async (url: string, data: object): Promise<any> => {
  const options: RequestInit = {
    method: "PUT",
    headers: withSiteIdHeaders({
      "Content-Type": "application/json",
    }),
    body: JSON.stringify(data),
  };
  const res = await fetch(`${BASE_URL}/${url}`, options);
  if (res.status === 401) {
    handleUnauthorizedResponse();
  }
  const resData = await res.json();
  console.log('putData response:', resData);
  return resData.data;
};

export const deleteData = async (url: string, data?: object): Promise<any> => {
  const options: RequestInit = {
    method: "DELETE",
    headers: withSiteIdHeaders({
      "Content-Type": "application/json",
    }),
    body: data ? JSON.stringify(data) : undefined,
  };
  const res = await fetch(resolveApiUrl(url), options);
  if (res.status === 401) {
    handleUnauthorizedResponse();
  }
  if (res.status === 204) return true
  return res;
};

// GET 응답을 공통 data wrapper 없이 원문 JSON으로 읽는다. init은 지도 bbox 요청처럼 AbortSignal이 필요한 호출에서 사용한다.
export const getRawJson = async (url: string, init: RequestInit = {}): Promise<any> => {
  const res = await fetch(resolveApiUrl(url), {
    ...init,
    method: "GET",
    headers: withSiteIdHeaders(init.headers),
  });
  if (res.status === 401) {
    handleUnauthorizedResponse();
  }

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

  const contentLength = res.headers.get('content-length');
  if (contentLength === '0') {
    return null;
  }

  const text = await res.text();
  if (!text || text.trim() === '') {
    return null;
  }

  try {
    return JSON.parse(text);
  } catch (error) {
    console.error('JSON parsing error:', error);
    throw new Error(`Invalid JSON response from server: ${url}`);
  }
};

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();
};

// 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;
};