const firebaseConfig = {
    apiKey: "AIzaSyCc_bwjTnBIC42Kw6Lv9cCYbyMCguIoQck",
    authDomain: "first-assembly-of-god-ca-ebff6.firebaseapp.com",
    databaseURL: "https://first-assembly-of-god-ca-ebff6-default-rtdb.firebaseio.com",
    projectId: "first-assembly-of-god-ca-ebff6",
    storageBucket: "first-assembly-of-god-ca-ebff6.appspot.com",
    messagingSenderId: "589574395292",
    appId: "1:589574395292:web:e5fc9d2908d2a6b49a2459",
    measurementId: "G-GKTEN7ECDQ"
};

FirebaseCRUD = {
    DATABASE_NAME: "universe",
    SONG_LIST: "songCollection",
    PLAYLISTS: "playlists",

    initialize: function () {
        if (!firebase.apps.length) {
            firebase.initializeApp(firebaseConfig);
        }

        firebase.auth().onAuthStateChanged(user => {
            if (!user) {
                window.open("Authentication.html", "_self");
            }
        });
    },

    signOut: function () {
        return firebase.auth().signOut();
    },

    addSong: function (song) {
        var ref = firebase.database().ref(`${this.DATABASE_NAME}/${this.SONG_LIST}`).push();
        var key = ref.key;

        song.setSongID(key);
        return ref.set(SongAPI.createJSONFromSongObject(song, key));
    },

    addPlaylist: function (playlistDate, selectedSongs) {
        return firebase.database().ref(`${this.DATABASE_NAME}/${this.PLAYLISTS}`).update({
            [playlistDate]: selectedSongs
        });
    },

    addSongPictureAndGetReference: function (imageURL, songName) {
        if (imageURL !== DEFAULT_DISC_IMAGE && !imageURL.includes("firebase") && imageURL !== "") {
            var imageName = songName.replace(/\s+/g, "") + DatesAPI.getCurrentTimeInMilliseconds();
            var imageRef = firebase.storage().ref().child(imageName);
            return imageRef.putString(imageURL, "data_url").then((snapshot) => {
                console.log("Song Image uploaded successfully");
                return firebase.storage().ref(imageName).getDownloadURL().then(data => {
                    return data;
                });
            });
        }

        return Promise.resolve(DEFAULT_DISC_IMAGE);
    },

    deleteOldPictureFromStorage: function (oldImageURL) {
        if (oldImageURL.includes("firebase")) {
            var imageRef = firebase.storage().refFromURL(oldImageURL);

            return imageRef.delete();
        }

        return Promise.resolve("");
    },

    load: function () {
        return firebase.database().ref(this.DATABASE_NAME).once("value");
    },

    updateSong: function (song) {
        var updates = {};
        updates[`${this.DATABASE_NAME}/${this.SONG_LIST}/${song.getSongID()}/`] = SongAPI.createJSONFromSongObject(song);
        return firebase.database().ref().update(updates);
    },

    delete: function (id) {
        return firebase.database().ref(`${this.DATABASE_NAME}/${this.SONG_LIST}`).child(id).remove();
    }
}