import { Http } from "./http";
import { navigator } from "./browser-utils";

/**
 * Responsible for sending log requests to the back-end with
 * error information.
 *
 * @export
 * @abstract
 * @class Logger
 */
export abstract class Logger {
    /**
     * Log an error to the server.
     *
     * @static
     * @param {Error} err
     * @memberof Logger
     */
    public static async log(err: Error) {
        if (!window._RecSys.Bundle.Properties.logger.supressErrors) {
            throw err;
        }

        await Http.post(
            `${window._RecSys.Bundle.Properties.event.url}/${window._RecSys.Bundle.Configuration.store.slug}/${window._RecSys.Bundle.Properties.event.endpoint.log}`,
            {
                url: window.location.href,
                message: this.buildMessage(err),
                err: err.message,
            },
        );
    }

    /**
     * Build a error message with more information, including
     * user's browser and error stack trace.
     *
     * @private
     * @static
     * @param {Error} err Error to get stack and message from.
     * @return {string}
     * @memberof Logger
     */
    private static buildMessage(err: Error): string {
        const browser = navigator()?.userAgent || "unknown";

        const message = `
            URL: ${window.location.href}
            Message: ${err.message}
            Browser: ${browser}

            ${err.stack}
        `;

        // Remove trailing whitespace from each line.
        return message
            .split("\n")
            .map((s) => s.trim())
            .join("\n");
    }
}