import { Cron } from "croner";
import { createLogger } from "../logger/logger.controller.js";

// example createJob
// createCronJob("test Cron", "*/5 * * * * *", async () => {
// 	console.log("help");
// });

export interface JobInfo {
	name: string;
	schedule: string;
	nextRun: Date | null;
	isRunning: boolean;
}

// Store running cronjobs
export const runningCrons: Record<string, Cron> = {};

export const createCronJob = async (
	name: string,
	schedule: string, // cron string with 8 8 IE: */5 * * * * * every 5th second
	task?: () => Promise<void>, // what function are we passing over
) => {
	// get the timezone based on the os timezone set
	const timeZone = Intl.DateTimeFormat().resolvedOptions().timeZone;

	// Destroy existing job if it exists
	if (runningCrons[name]) {
		runningCrons[name].stop();
	}

	// Create new job with Croner
	runningCrons[name] = new Cron(
		schedule,
		{
			timezone: timeZone,
			catch: true, // Prevents unhandled rejections
			name: name,
		},
		task,
	);

	const log = createLogger({ module: "system", subModule: "croner" });

	log.info({}, `A job for ${name} was just created.`);
};

export const getAllJobs = (): JobInfo[] => {
	return Object.entries(runningCrons).map(([name, job]) => ({
		name,
		schedule: job.getPattern() || "invalid",
		nextRun: job.nextRun() || null,
		lastRun: job.previousRun() || null,
		isRunning: job.isRunning(), //job ? !job.isStopped() : false,
	}));
};

export const removeCronJob = (name: string) => {
	if (runningCrons[name]) {
		runningCrons[name].stop();
		delete runningCrons[name];
	}
};

export const stopCronJob = (name: string) => {
	if (runningCrons[name]) {
		runningCrons[name].pause();
	}
};

export const resumeCronJob = (name: string) => {
	if (runningCrons[name]) {
		runningCrons[name].resume();
	}
};