class Database {

    protected data: object;
    protected path: string;

    constructor() {
        this.data = {};
    }

    public ref(path: string): Database {
        if(!path) {
            throw new Error("Path is not set");
        }
        this.path = path;
        return this;
    }

    public push(obj: object): string {
        if(!obj) {
            throw new Error("Data object is missing");
        }
        const pushId: string= this.generatePushID();
        const key: string = this.path + '/' + pushId;

        this.data[key] = obj;
        return pushId;
    }

    public remove() {
        Object.keys(this.data).forEach((key) => {
            if(key.substr(0, this.path.length) === this.path) {
                delete this.data[key];
            }
        })
    }


    public once(continuation: any) {
        // tslint:disable-next-line:no-console
        console.log("Implement once");
    }

    // This should be updated to return more firebase like push id
    private generatePushID() {
        return Math.random().toString(36).replace(/[^a-z]+/g, '').substr(0, 5);
    }

}

export default Database;