import { EL } from "./dom.js";
import { displayTripDetails } from "./trip-details.js";
import { fetchTrip } from './api.js';
import { DataStore } from './datastore.js';

let element_board = document.querySelector("#drafting-board-content");

export function addJourneyToDraftingBoard(journey) {
	element_board.innerText = "";

	for (let leg of journey.legs.filter(item => !("walking" in item))) {
		DataStore.tracked_trips.remember(leg.tripId, leg.origin.id, leg.destination.id);
		fetchTrip(leg.tripId).then(result => {
			DataStore.trips.remember(result.trip);
		});
	}

	trackedTripsLocationsSorted();

	let station_offset = 0;
	let trip_offset = 1;

	let first_station = true;

	for (let leg of journey.legs.filter(item => !("walking" in item))) {
		if (first_station) {
			let el_origin_name = EL("div", {
				class: [ "station-name" ],
				style: {
					"grid-column-start": 1,
					"grid-column-end": 4,
					"grid-row-start": 1,
					"grid-row-end": 1,

				},
			});
			el_origin_name.innerText = leg.origin.name;
			element_board.appendChild(el_origin_name);

			let el_origin_column = EL("div", {
				class: [ "station-column" ],
				style: {
					"grid-column-start": 2,
					"grid-column-end": 3,
					"grid-row-start": 2,
					"grid-row-end": journey.legs.length + 2,

				},
			});
			element_board.appendChild(el_origin_column);

			first_station = false;
		}

		let el_destination_name = EL("div", {
			class: [ "station-name" ],
			style: {
				"grid-column-start": (station_offset * 3) + 4,
				"grid-column-end": (station_offset * 3) + 7,
				"grid-row-start": 1,
				"grid-row-end": 1,

			},
		});
		el_destination_name.innerText = leg.destination.name;
		element_board.appendChild(el_destination_name);

		let el_destination_column = EL("div", {
			class: [ "station-column" ],
			style: {
				"grid-column-start": (station_offset * 3) + 5,
				"grid-column-end": (station_offset * 3) + 6,
				"grid-row-start": 2,
				"grid-row-end": journey.legs.length + 2,

			},
		});
		element_board.appendChild(el_destination_column);

		let el_trip_left = EL("div", {
			class: [ "trip-left" ],
			style: {
				"grid-column-start": (station_offset * 3) + 1,
				"grid-column-end": (station_offset * 3) + 2,
				"grid-row-start": (trip_offset) + 1,
				"grid-row-end": (trip_offset) + 1,

			},
		});
		el_trip_left.appendChild(document.createTextNode(new Date(leg.departure).toLocaleTimeString()));
		el_trip_left.appendChild(EL("br", {}));
		el_trip_left.appendChild(document.createTextNode("Gleis " + leg.departurePlatform));
		element_board.appendChild(el_trip_left);

		let el_trip = EL("div", {
			class: [ "trip" ],
			style: {
				"grid-column-start": (station_offset * 3) + 3,
				"grid-column-end": (station_offset * 3) + 5,
				"grid-row-start": (trip_offset) + 1,
				"grid-row-end": (trip_offset) + 1,

			},
		});
		el_trip.innerText = leg?.line?.name;

		el_trip.addEventListener("click", event => {
			console.log(leg.tripId);
			displayTripDetails(leg.tripId);
		});

		element_board.appendChild(el_trip);

		let el_trip_right = EL("div", {
			class: [ "trip-right" ],
			style: {
				"grid-column-start": (station_offset * 3) + 6,
				"grid-column-end": (station_offset * 3) + 7,
				"grid-row-start": (trip_offset) + 1,
				"grid-row-end": (trip_offset) + 1,

			},
		});
		el_trip_right.appendChild(document.createTextNode(new Date(leg.arrival).toLocaleTimeString()));
		el_trip_right.appendChild(EL("br", {}));
		el_trip_right.appendChild(document.createTextNode("Gleis " + leg.arrivalPlatform));

		element_board.appendChild(el_trip_right);

		station_offset += 1;
		trip_offset += 1;
	}
}

export function getLocationWithLeastInboundTrips(locations, trips) {
	function numberOfInboundTrips(location) {
		return trips.filter(trip => trip.destination == location).length;
	}

	let locations_sorted_by_number_of_inbound_trips = locations.toSorted((location_a, location_b) => {
		let n_a = numberOfInboundTrips(location_a);
		let n_b = numberOfInboundTrips(location_b);

		if (n_a == n_b) {
			return 0;
		} else if (n_a > n_b) {
			return 1;
		} else {
			return -1;
		}
	});

	return locations_sorted_by_number_of_inbound_trips[0];
}

export function sortLocations(sorted_locations, unsorted_locations, trips) {
	if (unsorted_locations.length == 0) {
		return sorted_locations;
	}

	let selected_location = getLocationWithLeastInboundTrips(unsorted_locations, trips);

	unsorted_locations = unsorted_locations.filter(location => location != selected_location);
	trips = trips.filter(trip => trip.destination != selected_location && trip.origin != selected_location);

	return sortLocations(sorted_locations.concat([ selected_location ]), unsorted_locations, trips);
}

export function trackedTripsLocationsSorted() {
	let tracked_trips = DataStore.tracked_trips.get();
	let tracked_locations = Array.from(new Set(tracked_trips.map(trip => trip.origin).concat(tracked_trips.map(trip => trip.destination))));

	console.log(tracked_trips);
	console.log(tracked_locations);

	let sorted_locations = sortLocations([], tracked_locations, tracked_trips);

	console.log(sorted_locations);

	console.log(sorted_locations.map(item => DataStore.locations.get()[item]?.name));


}