import minBy from 'lodash/minBy.js';
import maxBy from 'lodash/maxBy.js';
import last from 'lodash/last.js';

const parseTrip = (ctx, t) => { // t = raw trip
	const {profile, opt} = ctx;

	// pretend the trip is a leg in a journey
	const fakeLeg = {
		type: 'JNY',
		dep: Array.isArray(t.stopL)
			? minBy(t.stopL, 'idx') || t.stopL[0]
			: {},
		arr: Array.isArray(t.stopL)
			? maxBy(t.stopL, 'idx') || last(t.stopL)
			: {},
		jny: t,
	};

	// todo: this breaks if the trip starts on a different day
	// how does HAFAS do this?
	const today = () => profile.formatDate(profile, Date.now());
	const date = t.date || today();

	const trip = profile.parseJourneyLeg(ctx, fakeLeg, date);
	trip.id = trip.tripId;
	delete trip.tripId;
	delete trip.reachable;

	if (opt.scheduledDays) {
		const nrOfStopovers = t.stopL.length;
		// trips seem to use sDaysL[], journeys use sDays
		const sDaysL = Array.isArray(t.sDaysL)
			? t.sDaysL
			: [];
		const matchingSDays = sDaysL.filter((sDays) => {
			return sDays.fLocIdx === 0 && sDays.tLocIdx === nrOfStopovers - 1;
		});

		// if there are >1 sDays, we don't know how to interpret them
		const sDays = matchingSDays.length === 1
			? matchingSDays[0]
			: null;
		// todo [breaking]: rename to scheduledDates
		trip.scheduledDays = profile.parseScheduledDays(ctx, sDays);
	}

	return trip;
};

export {
	parseTrip,
};