import { padZeros, sleep } from '../helpers.js';
import { mapInformation } from './DBMapping.js';

const dbCoachSequenceTimeout = 1500;

const rawDBCoachSequence = async (category, number, evaNumber, date, retry = 2) => {
	try {
		const searchParams = new URLSearchParams();

		searchParams.append("category",  category);
		searchParams.append("date",      `${date.getFullYear()}-${padZeros(date.getMonth()+1)}-${padZeros(date.getDate())}`);
		searchParams.append("time",      `${date.getFullYear()}-${padZeros(date.getMonth()+1)}-${padZeros(date.getDate())}T${padZeros(date.getHours())}:${padZeros(date.getMinutes())}:${padZeros(date.getSeconds())}Z`);
		searchParams.append("evaNumber", evaNumber);
		searchParams.append("number",    number);

		return await fetch(`/db/vehicle-sequence?${searchParams}`).then(x => x.json());
	} catch (e) {
		await sleep(dbCoachSequenceTimeout);
		if (retry) return rawDBCoachSequence(category, number, evaNumber, date, retry - 1);
	}
}

export const cachedCoachSequence = (category, number, evaNumber, departure, mode) => {
	if (!category || !number || !evaNumber || !departure) return null;

	const key            = `${category}-${number}-${evaNumber}-${departure.toISOString()}`;
	let   rawSequence    = sessionStorage.getItem(key);
	let   cachedResponse = true;

	if (mode === 'noCache') rawSequence = null;

	if (!rawSequence) {
		if (mode === 'onlyCached') return null;
		cachedResponse = false;
		rawSequence = (async () => {
			try {
				const rawSequence = await rawDBCoachSequence(category, number, evaNumber, departure);
				if (!rawSequence) return null;

				sessionStorage.setItem(key, JSON.stringify(rawSequence));
				return rawSequence;
			} catch (e) {
				console.log(e)
				return null;
			}
		})();
	} else {
		rawSequence = JSON.parse(rawSequence);
	}

	return {
		...mapInformation(rawSequence, category, number, evaNumber),
		cachedResponse
	};
};