// Firebase V9 ESM seulement
import { initializeApp } from "https://www.gstatic.com/firebasejs/9.6.1/firebase-app.js";
import {
    getAuth,
    createUserWithEmailAndPassword,
    signInWithEmailAndPassword,
    onAuthStateChanged,
    signOut
} from "https://www.gstatic.com/firebasejs/9.6.1/firebase-auth.js";

import {
    getFirestore,
    collection,
    addDoc,
    doc,
    setDoc
} from "https://www.gstatic.com/firebasejs/9.6.1/firebase-firestore.js";

import {
    query,
    where,
    getDocs
} from "https://www.gstatic.com/firebasejs/9.6.1/firebase-firestore.js";

const firebaseConfig = {
    apiKey: "AIzaSyBXKB6AGbTN95lOLrIVpWrSIK_uL_C6GUA",
    authDomain: "music-app-riotjs.firebaseapp.com",
    projectId: "music-app-riotjs",
    storageBucket: "music-app-riotjs.firebasestorage.app",
    messagingSenderId: "483729603961",
    appId: "1:483729603961:web:122965ce7dbeb2e85103a8",
    measurementId: "G-18P6WCT80"
};

const app = initializeApp(firebaseConfig);
const auth = getAuth(app);
const db = getFirestore(app);

export async function login(email, password) {
    const userC = await signInWithEmailAndPassword(auth, email, password);
    localStorage.setItem("uid", userC.user.uid);
    return userC;
}

export async function sign(email, password) {
    const userCred = await createUserWithEmailAndPassword(auth, email, password);
    await adduserdata(userCred.user.email, userCred.user.uid);
    localStorage.setItem("uid", userCred.user.uid);
    return userCred;
}

export async function adduserdata(email_user, uid) {
    await addDoc(collection(db, "users"), {
        email: email_user,
        uid: uid
    });
}

export async function logout() {
    await signOut(auth);
}

window.observeAuthState = function(callback) {
    onAuthStateChanged(auth, callback);
};


export async function favorite(releaseId) {
    const storedUid = localStorage.getItem("uid");

    const usersRef = collection(db, "users");
    const q = query(usersRef, where("uid", "==", storedUid));
    const querySnapshot = await getDocs(q);


    const userDoc = querySnapshot.docs[0];
    const userDocId = userDoc.id;

    const favoritesRef = collection(db, "users", userDocId, "favorites");

    await addDoc(favoritesRef, {
        releaseId: releaseId,
    });
}


export async function getFavorites() {
    const storedUid = localStorage.getItem("uid");

    if (!storedUid) {
        console.warn("Aucun UID trouvé dans localStorage.");
        return [];
    }

    const usersRef = collection(db, "users");
    const q = query(usersRef, where("uid", "==", storedUid));
    const querySnapshot = await getDocs(q);

    if (querySnapshot.empty) {
        console.warn("Aucun document utilisateur trouvé avec cet UID.");
        return [];
    }

    const userDoc = querySnapshot.docs[0];
    const userDocId = userDoc.id;

    const favoritesRef = collection(db, "users", userDocId, "favorites");
    const snapshot = await getDocs(favoritesRef);

    return snapshot.docs.map(doc => doc.data().releaseId);
}

export async function isFavorite(releaseId) {
    const storedUid = localStorage.getItem("uid");
    if (!storedUid) return false;

    const usersRef = collection(db, "users");
    const userQuery = query(usersRef, where("uid", "==", storedUid));
    const userSnapshot = await getDocs(userQuery);

    if (userSnapshot.empty) return false;

    const userDoc = userSnapshot.docs[0];
    const userDocId = userDoc.id;

    const favoritesRef = collection(db, "users", userDocId, "favorites");
    const favQuery = query(favoritesRef, where("releaseId", "==", releaseId));
    const favSnapshot = await getDocs(favQuery);

    return !favSnapshot.empty;
}

export async function removeFavorite(releaseId) {
    const storedUid = localStorage.getItem("uid");

    const usersRef = collection(db, "users");
    const userQuery = query(usersRef, where("uid", "==", storedUid));
    const userSnapshot = await getDocs(userQuery);

    const userDoc = userSnapshot.docs[0];
    const userDocId = userDoc.id;

    const favoritesRef = collection(db, "users", userDocId, "favorites");
    const favQuery = query(favoritesRef, where("releaseId", "==", releaseId));
    const favSnapshot = await getDocs(favQuery);

    await deleteDoc(doc.ref);

    console.log(`Le favori avec releaseId ${releaseId} a été supprimé.`);
}

window.login = login;
window.sign = sign;
window.logout = logout;
window.favorite = favorite;
window.getFavorites = getFavorites;
window.isFavorite = isFavorite;
window.removeFavorite = removeFavorite;