import { RequestHandler, Router } from "express";
import { workerRunnerInfo } from "../workRunner";
import { coalesce } from "../lib/initTools";

const PULL_INTERVAL = parseInt(coalesce(process.env.PULL_INTERVAL, "10000"));

/** Maximum time between two worker jobs */
const MAX_WORKER_LATENCY = PULL_INTERVAL * 2.5;

/**
 * Router koji se izvršava u slučaju grube greške koja nije obrađena nigdje prije
 * @param req express request
 * @param res express response
 * @param next 
 */
export const healthcheckRouter:RequestHandler = async (req, res, next) => {
    const workerLatency = Date.now() - workerRunnerInfo.lastWorkTime;

    if(workerLatency > MAX_WORKER_LATENCY) {
        const msg = `No work done in ${workerLatency}ms. Last worker status = "${workerRunnerInfo.status}"`;

        console.warn(msg)

        res.status(500);
        res.setHeader('Content-Type', 'text/plain');
        res.end(msg);
    } else {
        res.status(200);
        res.setHeader('Content-Type', 'text/plain');
        res.end('OK');
    }
};

export const pingRouter = Router();
pingRouter.get('/', healthcheckRouter);