import axios from "axios";
import { API_ENDPOINTS } from "./apiEndpoints";


/**
 * Create an Axios instance with the base URL from environment variables
 * and default headers for JSON communication.
 */
const axiosInstance = axios.create({
  baseURL: import.meta.env.VITE_THIRUKALYANAM_API_BASE_URL ||
  "https://www.thirukalyanam.amrithaa.net/backend/api/" ,
  headers: {
    "Content-Type": "application/json",
  },
});

/**
 * Create a separate Axios instance for handling multipart file uploads
 * while sharing the same base URL and authorization mechanism.
 */
const apiForFiles = axios.create({
  baseURL: import.meta.env.VITE_THIRUKALYANAM_API_BASE_URL,
  headers: {
    "Content-Type": "multipart/form-data",
  },
});

/**
 * Set Access Token
 */
export const setAccessToken = (token) => {
  if (token) {
    localStorage.setItem("access_token", token); // Store token in localStorage
    axiosInstance.defaults.headers["Authorization"] = `Bearer ${token}`;
    apiForFiles.defaults.headers["Authorization"] = `Bearer ${token}`;
  } else {
    localStorage.removeItem("access_token");
    delete axiosInstance.defaults.headers["Authorization"];
    delete apiForFiles.defaults.headers["Authorization"];
  }
};

/**
 * Add a request interceptor to include the authorization token
 * in the request headers if it exists in localStorage.
 */
const addAuthInterceptor = (instance) => {
  instance.interceptors.request.use(
    (config) => {
      const token = localStorage.getItem("access_token");
      if (token) {
        config.headers.Authorization = `Bearer ${token}`;
      }
      return config;
    },
    (error) => Promise.reject(error)
  );
};

/**
 * Add a response interceptor to handle global error scenarios,
 * such as redirecting to the login page on a 401 Unauthorized error.
 */
const addErrorInterceptor = (instance) => {
  instance.interceptors.response.use(
    (response) => response,
    (error) => {
      if (error.response && error.response.status === 401 && !error.config?.url?.includes("/login") && !error.config?.url?.includes("/forgot_password_send_otp") && !error.config?.url?.includes("/forgot_password_verify_otp") && !error.config?.url?.includes("/forgot_password_update")) {
        console.error("Unauthorized access - logging out...");
        localStorage.removeItem("access_token");
        // window.location.href = "/";
         // SAFE redirect (works outside React)
        window.location.replace("/");
      } else if (error.response && error.response.status === 403) {
        window.location.href = "/";
        // navigate("/");
      } else if (error.response && error.response.status === 404) {
        console.error("404 Error - Endpoint not found:", error.config?.url);
        // Don't redirect for 404, let component handle it
      } else if (error.response && error.response.status >= 500) {
        console.error("Server error:", error.response?.data);
      }
      return Promise.reject(error);
    }
  );
};

// Apply interceptors to both instances
addAuthInterceptor(axiosInstance);
addAuthInterceptor(apiForFiles);

addErrorInterceptor(axiosInstance);
addErrorInterceptor(apiForFiles);

/**
 * Clear all user data from the browser: localStorage, sessionStorage, and cookies.
 */
export const clearUserData = () => {
  try {
    // Clear localStorage
    localStorage.clear();

    // Clear sessionStorage
    sessionStorage.clear();

    // Clear cookies
    document.cookie.split(";").forEach((cookie) => {
      const [name] = cookie.split("=");
      document.cookie = `${name}=;expires=Thu, 01 Jan 1970 00:00:00 UTC;path=/`;
    });

    // Remove authorization headers from Axios instances
    delete axiosInstance.defaults.headers["Authorization"];
    delete apiForFiles.defaults.headers["Authorization"];

    console.log("User data cleared from browser.");
    // Add redirect to ensure all tabs show login page
    //  window.location.href = '/';
  } catch (error) {
    console.error("Error clearing user data:", error);
  }
};

export const urlToFile = async (url, filename = "file") => {
  try {
    // Use your axios instance to request the URL as a Blob
    const response = await apiForFiles.get(url, {
      responseType: "blob",
    });

    // Axios header keys are lowercase
    const contentType =
      response.headers["content-type"] ||
      "*"(
        // Guess MIME type based on filename extension
        filename.toLowerCase().endsWith(".png")
          ? "image/png"
          : filename.toLowerCase().endsWith(".webp")
          ? "image/webp"
          : filename.toLowerCase().endsWith(".jpg") ||
            filename.toLowerCase().endsWith(".jpeg")
          ? "image/jpeg"
          : "application/octet-stream"
      );

    // Create and return a File object from the blob data
    return new File([response.data], filename, { type: contentType });
  } catch (error) {
    console.error("urlToFile axios error:", error);
    return null;
  }
};



/**
 * Get FCM token from localStorage
 */
const getFcmToken = () => {
  return localStorage.getItem("fcm_token");
};

/**
 * Clear FCM token from localStorage
 */
const clearFcmToken = () => {
  localStorage.removeItem("fcm_token");
};

export const logoutAPI = async () => {
  try {
    await axiosInstance.post(API_ENDPOINTS.LOGOUT);
  } catch (error) {
    console.error("Logout API failed:", error);
  } finally {
    setAccessToken(null);
    localStorage.clear();
    sessionStorage.clear();
    window.location.replace("/login");
  }
};

// Export both instances
export default axiosInstance;
export { apiForFiles };