import { useState, useEffect } from "react";
import auth from "@react-native-firebase/auth";
import firestore from "@react-native-firebase/firestore";
import {
  User,
  CaregiverProfile,
  ChildProfile,
  ParentProfile,
} from "./types/profileTypes";

type ProfileType = "parent" | "child" | "caregiver" | null;

const useAuth = () => {
  const [user, setUser] = useState<User | null>(null);
  const [profileType, setProfileType] = useState<ProfileType>(null);
  const [email, setEmail] = useState<string>("");
  const [password, setPassword] = useState<string>("");

  useEffect(() => {
    const isDevelopment = __DEV__;

    if (isDevelopment) {
      firestore().useEmulator("localhost", 8080);
      auth().useEmulator("http://127.0.0.1:9099");
    }

    const unsubscribe = auth().onAuthStateChanged(async (firebaseUser) => {
      if (firebaseUser) {
        const userObj: User = {
          uid: firebaseUser.uid,
          email: firebaseUser.email,
        };
        setUser(userObj);

        try {
          const documentSnapshot = await firestore()
            .collection("Users")
            .doc(firebaseUser.uid)
            .get();
          if (documentSnapshot.exists) {
            setProfileType(documentSnapshot.data()?.profileType || null);
          }
        } catch (error) {
          console.error("Error fetching user profile type:", error);
          setProfileType(null);
        }
      } else {
        setUser(null);
        setProfileType(null);
      }
    });

    return unsubscribe;
  }, []);

  const handleRegister = async () => {
    try {
      await auth().createUserWithEmailAndPassword(email, password);
      console.log("user registered!");

      await auth().signInWithEmailAndPassword(email, password);
      console.log("user signed in!");

      let profileData: ParentProfile | ChildProfile | CaregiverProfile;
      switch (profileType) {
        case "parent":
          profileData = {
            userType: "parent",
            name: "",
            childrenIds: [],
          } as ParentProfile;
          break;
        case "child":
          profileData = {
            userType: "child",
            name: "",
            birthday: new Date(),
            parentId: "X",
          } as ChildProfile;
          break;
        case "caregiver":
          profileData = {
            userType: "caregiver",
            name: "Nanny Nannersen",
            contact: "5523123",
          } as CaregiverProfile;
          break;
        default:
          throw new Error("Invalid profile type");
      }

      const currentUser = auth().currentUser;
      if (currentUser) {
        await firestore()
          .collection("Profiles")
          .doc(currentUser.uid)
          .set(profileData);
        console.log("Profile document added!");
      }
    } catch (error) {
      console.error("Error during registration: ", error);
    }
  };

  const handleLogin = async () => {
    try {
      await auth().signInWithEmailAndPassword(email, password);
      console.log("User signed in!");
    } catch (error) {
      console.error("Error during sign in:", error);
    }
  };

  const handleSignOut = async () => {
    try {
      await auth().signOut();
      console.log("User signed out!");
    } catch (error) {
      console.error("Error during sign out:", error);
    }
  };

  const handleProfileTypeSelection = async (type: ProfileType) => {
    if (user) {
      setProfileType(type);

      try {
        await firestore()
          .collection("Users")
          .doc(user.uid)
          .set({ profileType: type }, { merge: true });
      } catch (error) {
        console.error("Error saving profile type:", error);
      }
    }
  };

  return {
    user,
    profileType,
    email,
    setEmail,
    password,
    setPassword,
    handleLogin,
    handleSignOut,
    handleProfileTypeSelection,
    handleRegister,
  };
};

export default useAuth;