/* eslint-disable @typescript-eslint/camelcase */
import FirebaseAdmin from 'firebase-admin';

export interface FirebaseUser {
    aud: string;
    auth_time: number;
    email: string | undefined;
    email_verified: boolean | undefined;
    exp: number;
    firebase: {
        identities: any;
        sign_in_provider: 'custom' | 'password' | 'phone' | 'anonymous' | 'google.com' | 'facebook.com' | 'github.com' | 'twitter.com';
    };
    iat: number;
    name: string;
    picture: string | undefined;
    uid: string;
}

export default class Firestore {
    private static instance: any;
    public static db: FirebaseFirestore.Firestore;

    private constructor() {
        try {
            const base = {
                type: 'service_account',
                project_id: process.env.FIRESTORE_project_id || '',
                private_key_id: process.env.FIRESTORE_private_key_id || '',
                private_key: process.env.FIRESTORE_private_key ? process.env.FIRESTORE_private_key.replace(/\\n/g, '\n') : '',
                client_email: process.env.FIRESTORE_client_email || '',
                client_id: process.env.FIRESTORE_client_id || '',
                auth_uri: process.env.FIRESTORE_auth_uri || '',
                token_uri: process.env.FIRESTORE_token_uri || '',
                auth_provider_x509_cert_url: process.env.FIRESTORE_auth_provider_x509_cert_url || '',
                client_x509_cert_url: process.env.FIRESTORE_client_x509_cert_url || '',
                apiKey: process.env.FIRESTORE_apiKey || '',
            };

            FirebaseAdmin.initializeApp(
                {
                    credential: FirebaseAdmin.credential.cert({
                        projectId: base.project_id,
                        clientEmail: base.client_email,
                        privateKey: base.private_key,
                    }),
                },
                'firestore',
            );

            Firestore.instance = FirebaseAdmin;
            Firestore.db = FirebaseAdmin.firestore();
        } catch (error) {
            if (!/already exists/.test(error.message)) {
                console.error('Firebase initialization error raised', error.stack);
            }
        }
    }

    public static getInstance(): FirebaseFirestore.Firestore {
        if (!Firestore.instance) {
            Firestore.instance = new Firestore();
        }

        return Firestore.db;
    }
}