import { getAbVariantId } from "./osiris";
import { CookieUtils } from "./cookie-utils";
import { nanoid } from "./nanoid";

/**
 * Session Utils
 *
 * @export
 * @abstract
 * @class SessionUtils
 */
export abstract class SessionUtils {
    /**
     * Get anonymous from cookies or return a new one.
     *
     * @static
     * @return {string} Anonymous
     * @memberof SessionUtils
     */
    public static getAnonymous(): string {
        const anonymous = CookieUtils.get(window._RecSys.Bundle.Properties.cookies.anonymous.key) || nanoid();
        const domain = CookieUtils.getDomain();

        CookieUtils.set(window._RecSys.Bundle.Properties.cookies.anonymous.key, anonymous, {
            ttl: window._RecSys.Bundle.Properties.cookies.anonymous.ttl,
            domain,
        }); // 365 days
        return anonymous;
    }

    /**
     * Get session from cookies or return a new one.
     *
     * @static
     * @return {string} Session
     * @memberof SessionUtils
     */
    public static getSession(): string {
        const session = CookieUtils.get(window._RecSys.Bundle.Properties.cookies.session.key) || nanoid();
        const domain = CookieUtils.getDomain();

        CookieUtils.set(window._RecSys.Bundle.Properties.cookies.session.key, session, {
            ttl: window._RecSys.Bundle.Properties.cookies.session.ttl,
            domain,
        }); // 30 minutes
        return session;
    }

    /**
     * Get variant from cookies or requests a new one.
     *
     * @static
     * @param {string} userId
     * @return {string} Session
     * @memberof SessionUtils
     */
    public static async getVariant(userId: string): Promise<string> {
        const variant =
            CookieUtils.get(window._RecSys.Bundle.Properties.cookies.variant.key) || (await getAbVariantId(userId));
        const domain = CookieUtils.getDomain();

        CookieUtils.set(window._RecSys.Bundle.Properties.cookies.variant.key, variant, {
            ttl: window._RecSys.Bundle.Properties.cookies.variant.ttl,
            domain,
        }); // 30 minutes
        return variant;
    }

    /**
     * Checks if current session is a new one.
     *
     * @static
     * @return {boolean} True on new session.
     * @memberof SessionUtils
     */
    public static isNewSession(): boolean {
        return CookieUtils.get(window._RecSys.Bundle.Properties.cookies.session.key) === undefined;
    }
}