import { EventManager } from "../events";
import { ViewManager } from "../ui";
import { Logger } from "../logging";

export class UnhandledErrorHandler {
    constructor(
        private readonly eventManager: EventManager,
        private readonly viewManager: ViewManager,
        private readonly logger: Logger
    ) {
        this.eventManager.addEventListener("onError", this.handlerError.bind(this));
        this.eventManager.addEventListener("onUnhandledRejection", this.handlerPromiseRejection.bind(this));
    }

    public handlerError(event: ErrorEvent): void {
        try {
            if (!event?.error) {
                let message: string;

                if (event.target) {
                    message = `Unknown error occured in element: ${event.target.toString()}`;

                    if (navigator.sendBeacon && event.target["src"]) {
                        navigator.sendBeacon(event.target["src"]);
                    }
                }
                else {
                    message = `Unknown error occured.`;
                }

                this.logger.trackError(new Error(message));
                return;
            }

            this.viewManager.notifyError("Oops, something went wrong.", "We are unable to complete your operation this time. Please try again later.");
            this.logger.trackError(event.error.stack || event.error);
        }
        catch (error) {
            console.error(`Unable to log error. ${error.stack || error.message}`);
        }
    }

    public handlerPromiseRejection(event: PromiseRejectionEvent): void {
        try {
            if (!event?.reason) {
                const message = event.target
                    ? `Unhandled rejection for target: ${event.target.toString()}`
                    : `Unhandled rejection.`;

                this.logger.trackError(new Error(message));
                return;
            }

            this.viewManager.notifyError("Oops, something went wrong.", "We are unable to complete your operation this time. Please try again later.");
            this.logger.trackError(new Error(`Unhandled rejection: ${event.reason.stack || event.reason}`));
        }
        catch (error) {
            console.error(`Unable to log error. ${error.stack || error.message}`);
        }
    }
}