import { useEffect, useState, useCallback } from "react";
import {
  FacebookLoginResponse,
  FacebookLoginError,
  FacebookUser,
  FacebookSDKInitOptions,
} from "@/types/facebook-login";

export interface UseFacebookLoginOptions extends FacebookSDKInitOptions {}

export const useFacebookLogin = (options: UseFacebookLoginOptions) => {
  const [isLoaded, setIsLoaded] = useState(false);
  const [isLoggedIn, setIsLoggedIn] = useState(false);
  const [user, setUser] = useState<FacebookUser | null>(null);

  const {
    appId,
    version = "v18.0",
    cookie = true,
    xfbml = true,
    autoLogAppEvents = true,
  } = options;

  // Initialize Facebook SDK
  useEffect(() => {
    if (typeof window === "undefined") return;

    // Load Facebook SDK if not already loaded
    if (!window.FB) {
      const script = document.createElement("script");
      script.src = `https://connect.facebook.net/en_US/sdk.js`;
      script.async = true;
      script.defer = true;
      script.crossOrigin = "anonymous";

      window.fbAsyncInit = () => {
        window.FB.init({
          appId,
          cookie,
          xfbml,
          version,
          autoLogAppEvents,
        });
        setIsLoaded(true);

        // Check login status
        window.FB.getLoginStatus((response: any) => {
          if (response.status === "connected") {
            setIsLoggedIn(true);
            getUserInfo(response.authResponse.accessToken);
          }
        });
      };

      document.head.appendChild(script);
    } else {
      setIsLoaded(true);
    }

    return () => {
      // Cleanup if needed
    };
  }, [appId, cookie, xfbml, version, autoLogAppEvents]);

  const getUserInfo = useCallback((accessToken: string) => {
    window.FB.api(
      "/me",
      { fields: "name,email,picture" },
      (response: FacebookUser) => {
        if (response && !response.error) {
          setUser(response);
        }
      }
    );
  }, []);

  const login = useCallback(
    (permissions: string[] = ["public_profile", "email"]) => {
      return new Promise<FacebookLoginResponse>((resolve, reject) => {
        if (!window.FB) {
          reject(new Error("Facebook SDK not loaded"));
          return;
        }

        window.FB.login(
          (response: any) => {
            if (response.status === "connected") {
              setIsLoggedIn(true);
              getUserInfo(response.authResponse.accessToken);
              resolve(response.authResponse);
            } else if (response.status === "not_authorized") {
              reject({
                error: "not_authorized",
                errorDescription: "User denied permissions",
              });
            } else {
              reject({ error: "unknown", errorDescription: "Login failed" });
            }
          },
          { scope: permissions.join(",") }
        );
      });
    },
    [getUserInfo]
  );

  const logout = useCallback(() => {
    return new Promise<void>((resolve, reject) => {
      if (!window.FB) {
        reject(new Error("Facebook SDK not loaded"));
        return;
      }

      window.FB.logout((response: any) => {
        setIsLoggedIn(false);
        setUser(null);
        resolve();
      });
    });
  }, []);

  const getLoginStatus = useCallback(() => {
    return new Promise<any>((resolve, reject) => {
      if (!window.FB) {
        reject(new Error("Facebook SDK not loaded"));
        return;
      }

      window.FB.getLoginStatus((response: any) => {
        resolve(response);
      });
    });
  }, []);

  return {
    isLoaded,
    isLoggedIn,
    user,
    login,
    logout,
    getLoginStatus,
  };
};