From 6b2161f4ccee377917534a4c8ea9a46854547ca4 Mon Sep 17 00:00:00 2001
From: tarunsinghofficial <tarunsinghwap7@gmail.com>
Date: Thu, 8 Aug 2024 21:00:34 +0530
Subject: [PATCH] Adds Route Map overlay feature

Fixes #24 - Trip Details List and Map Overlay
Fixes #29 - The bus's route should also be projected onto the map
Fixes #30 - Hide unrelated stops on the map while a route line is being displayed

Co-authored-by: tarunsinghofficial <tarunsinghwap7@gmail.com>
---
 src/components/map/GoogleMap.svelte           | 55 +++++++++---
 src/components/map/RouteMap.svelte            | 83 +++++++++++++++++++
 src/components/oba/StopPane.svelte            |  4 +
 src/components/oba/TripDetailsPane.svelte     |  3 -
 src/lib/googleMaps.js                         | 16 ++++
 src/routes/+page.svelte                       | 33 +++++++-
 src/routes/api/oba/shape/[shapeId]/+server.js | 24 ++++++
 7 files changed, 203 insertions(+), 15 deletions(-)
 create mode 100644 src/components/map/RouteMap.svelte
 create mode 100644 src/routes/api/oba/shape/[shapeId]/+server.js

diff --git a/src/components/map/GoogleMap.svelte b/src/components/map/GoogleMap.svelte
index 16924f8..ab886e1 100644
--- a/src/components/map/GoogleMap.svelte
+++ b/src/components/map/GoogleMap.svelte
@@ -7,19 +7,24 @@
 		PUBLIC_OBA_REGION_CENTER_LAT as initialLat,
 		PUBLIC_OBA_REGION_CENTER_LNG as initialLng
 	} from '$env/static/public';
-	import { pushState } from '$app/navigation';
 
+	import { debounce } from '$lib/utils';
+	import { pushState } from '$app/navigation';
 	import { createMap, loadGoogleMapsLibrary, nightModeStyles } from '$lib/googleMaps';
 	import LocationButton from '$lib/LocationButton/LocationButton.svelte';
 	import StopMarker from './StopMarker.svelte';
+	import RouteMap from './RouteMap.svelte';
 
-	import { debounce } from '$lib/utils';
+	export let selectedTrip;
+	export let selectedRoute = null;
+	export let showRoute = false;
 
 	const dispatch = createEventDispatcher();
 
 	let map = null;
 
 	let markers = [];
+	let allStops = [];
 
 	async function loadStopsForLocation(lat, lng) {
 		const response = await fetch(`/api/oba/stops-for-location?lat=${lat}&lng=${lng}`);
@@ -50,19 +55,41 @@
 
 	async function loadStopsAndAddMarkers(lat, lng) {
 		const json = await loadStopsForLocation(lat, lng);
-		const stops = json.data.list;
+		const newStops = json.data.list;
 
-		for (const s of stops) {
-			if (markerExists(s)) {
-				continue;
-			}
+		allStops = [...new Map([...allStops, ...newStops].map((stop) => [stop.id, stop])).values()];
+
+		clearAllMarkers();
 
-			addMarker(s);
+		if (showRoute && selectedRoute) {
+			const stopsToShow = allStops.filter((s) => s.routeIds.includes(selectedRoute.id));
+			stopsToShow.forEach((s) => addMarker(s));
+		} else {
+			newStops.forEach((s) => addMarker(s));
 		}
 	}
 
-	function markerExists(s) {
-		return markers.some((marker) => marker.s.id === s.id);
+	function clearAllMarkers() {
+		markers.forEach(({ marker, overlay, element }) => {
+			marker?.setMap(null);
+
+			if (overlay) {
+				overlay.setMap(null);
+				overlay.draw = () => {};
+				overlay.onRemove?.();
+			}
+			element?.parentNode?.removeChild(element);
+		});
+		markers = [];
+	}
+
+	$: if (selectedRoute && showRoute) {
+		clearAllMarkers();
+		const stopsToShow = allStops.filter((s) => s.routeIds.includes(selectedRoute.id));
+		stopsToShow.forEach((s) => addMarker(s));
+	} else if (!showRoute || !selectedRoute) {
+		clearAllMarkers();
+		allStops.forEach((s) => addMarker(s));
 	}
 
 	function addMarker(s) {
@@ -107,6 +134,9 @@
 			container.style.position = 'absolute';
 			this.getPanes().overlayMouseTarget.appendChild(container);
 		};
+		overlay.onRemove = function () {
+			container?.parentNode?.removeChild(container);
+		};
 		markers.push({ s, marker, overlay, element: container });
 	}
 
@@ -161,6 +191,11 @@
 </script>
 
 <div id="map"></div>
+
+{#if selectedTrip}
+	<RouteMap {map} tripId={selectedTrip.tripId} />
+{/if}
+
 <LocationButton on:locationObtained={handleLocationObtained} />
 
 <style>
diff --git a/src/components/map/RouteMap.svelte b/src/components/map/RouteMap.svelte
new file mode 100644
index 0000000..8ea7e69
--- /dev/null
+++ b/src/components/map/RouteMap.svelte
@@ -0,0 +1,83 @@
+<script>
+	import { onMount, onDestroy } from 'svelte';
+	import { drawPolyline, loadGoogleMapsLibrary } from '$lib/googleMaps';
+
+	export let map;
+	export let tripId;
+
+	let shapeId = null;
+	let polyline;
+	let stopMarkers = [];
+	let infoWindow;
+	let tripData = null;
+	let shapeData = null;
+
+	onMount(async () => {
+		await loadGoogleMapsLibrary();
+		await loadRouteData();
+	});
+
+	onDestroy(() => {
+		polyline?.setMap(null);
+		stopMarkers.forEach((marker) => marker.setMap(null));
+		infoWindow?.close();
+	});
+
+	async function loadRouteData() {
+		const tripResponse = await fetch(`/api/oba/trip-details/${tripId}`);
+		tripData = await tripResponse.json();
+
+		const tripReferences = tripData?.data?.references?.trips;
+		const moreTripData = tripReferences?.find((t) => t.id == tripId);
+		shapeId = moreTripData?.shapeId;
+
+		if (shapeId) {
+			const shapeResponse = await fetch(`/api/oba/shape/${shapeId}`);
+			shapeData = await shapeResponse.json();
+			const points = shapeData?.data?.entry?.points;
+
+			if (points) {
+				drawPolyline(points, map);
+			}
+		}
+
+		const stopTimes = tripData?.data?.entry?.schedule?.stopTimes ?? [];
+		const stops = tripData?.data?.references?.stops ?? [];
+
+		for (const stopTime of stopTimes) {
+			const stop = stops.find((s) => s.id === stopTime.stopId);
+			if (stop) {
+				addStopMarker(stopTime, stop);
+			}
+		}
+	}
+
+	function addStopMarker(stopTime, stop) {
+		const marker = new google.maps.Marker({
+			position: { lat: stop.lat, lng: stop.lon },
+			map: map,
+			icon: {
+				path: google.maps.SymbolPath.CIRCLE,
+				scale: 5,
+				fillColor: '#FFFFFF',
+				fillOpacity: 1,
+				strokeWeight: 1,
+				strokeColor: '#000000'
+			}
+		});
+
+		marker.addListener('click', () => {
+			infoWindow?.close();
+
+			infoWindow = new google.maps.InfoWindow({
+				content: `<div>
+                            <h3>${stop.name}</h3>
+                            <p>Arrival time: ${new Date(stopTime.arrivalTime * 1000).toLocaleTimeString()}</p>
+                        </div>`
+			});
+			infoWindow.open(map, marker);
+		});
+
+		stopMarkers.push(marker);
+	}
+</script>
diff --git a/src/components/oba/StopPane.svelte b/src/components/oba/StopPane.svelte
index 6091f4a..2d7c244 100644
--- a/src/components/oba/StopPane.svelte
+++ b/src/components/oba/StopPane.svelte
@@ -2,6 +2,7 @@
 	import ArrivalDeparture from '../ArrivalDeparture.svelte';
 	import { onMount } from 'svelte';
 	import TripDetailsModal from '../navigation/TripDetailsModal.svelte';
+	import { createEventDispatcher } from 'svelte';
 
 	export let stop;
 	export let arrivalsAndDeparturesResponse = null;
@@ -13,6 +14,8 @@
 	let selectedTripDetails = null;
 	let interval;
 
+	const dispatch = createEventDispatcher();
+
 	async function loadData(stopID) {
 		loading = true;
 		const response = await fetch(`/api/oba/arrivals-and-departures-for-stop/${stopID}`);
@@ -62,6 +65,7 @@
 			scheduledArrivalTime: event.detail.scheduledArrivalTime
 		};
 		showTripDetails = true;
+		dispatch('tripSelected', selectedTripDetails);
 	}
 	function handleCloseTripDetailModal() {
 		showTripDetails = false;
diff --git a/src/components/oba/TripDetailsPane.svelte b/src/components/oba/TripDetailsPane.svelte
index ecfec31..50dbd29 100644
--- a/src/components/oba/TripDetailsPane.svelte
+++ b/src/components/oba/TripDetailsPane.svelte
@@ -74,9 +74,6 @@
 				currentStopIndex = -1;
 			}
 
-			console.log('Current Stop Index:', currentStopIndex);
-			console.log('Closest Stop:', tripDetails.status?.closestStop);
-
 			calculateBusPosition();
 		} catch (err) {
 			console.error('Error fetching trip details:', err);
diff --git a/src/lib/googleMaps.js b/src/lib/googleMaps.js
index 7ac94df..1b89119 100644
--- a/src/lib/googleMaps.js
+++ b/src/lib/googleMaps.js
@@ -145,3 +145,19 @@ export function nightModeStyles() {
 		}
 	];
 }
+
+export async function drawPolyline(shape, googleMap) {
+	await window.google.maps.importLibrary('geometry');
+	const decodedPath = google.maps.geometry.encoding.decodePath(shape);
+	const path = decodedPath.map((point) => ({ lat: point.lat(), lng: point.lng() }));
+
+	const polyline = new window.google.maps.Polyline({
+		path,
+		geodesic: true,
+		strokeColor: '#00FF00',
+		strokeOpacity: 1.0,
+		strokeWeight: 4
+	});
+
+	polyline.setMap(googleMap);
+}
diff --git a/src/routes/+page.svelte b/src/routes/+page.svelte
index 23df7f8..fe88f3d 100644
--- a/src/routes/+page.svelte
+++ b/src/routes/+page.svelte
@@ -4,6 +4,9 @@
 	import StopPane from '../components/oba/StopPane.svelte';
 
 	let stop;
+	let selectedTrip = null;
+	let showRoute = false;
+	let selectedRoute = null;
 
 	function stopSelected(event) {
 		stop = event.detail.stop;
@@ -11,13 +14,39 @@
 
 	function closePane() {
 		stop = null;
+		selectedTrip = null;
+		selectedRoute = null;
+		showRoute = false;
+		clearAllMarkers();
+	}
+
+	function tripSelected(event) {
+		selectedTrip = event.detail;
+		showRoute = true;
+		selectedRoute = {
+			id: event.detail.routeId,
+			shortName: event.detail.routeShortName
+		};
+	}
+
+	function toggleRoute() {
+		showRoute = !showRoute;
+		if (!showRoute) {
+			selectedRoute = null;
+		}
 	}
 </script>
 
 {#if stop}
 	<ModalPane on:close={closePane}>
-		<StopPane {stop} />
+		<StopPane
+			{stop}
+			on:tripSelected={tripSelected}
+			{showRoute}
+			{toggleRoute}
+			selectedRouteId={selectedRoute?.id}
+		/>
 	</ModalPane>
 {/if}
 
-<GoogleMap on:stopSelected={stopSelected} />
+<GoogleMap {selectedTrip} {selectedRoute} on:stopSelected={stopSelected} {showRoute} />
diff --git a/src/routes/api/oba/shape/[shapeId]/+server.js b/src/routes/api/oba/shape/[shapeId]/+server.js
new file mode 100644
index 0000000..7569916
--- /dev/null
+++ b/src/routes/api/oba/shape/[shapeId]/+server.js
@@ -0,0 +1,24 @@
+import { error, json } from '@sveltejs/kit';
+import { PUBLIC_OBA_SERVER_URL as baseURL } from '$env/static/public';
+import { PRIVATE_OBA_API_KEY as apiKey } from '$env/static/private';
+
+export async function GET({ params }) {
+	const { shapeId } = params;
+
+	let apiURL = `${baseURL}/api/where/shape/${shapeId}.json?key=${apiKey}`;
+
+	try {
+		const response = await fetch(apiURL);
+		console.log('response:', response);
+
+		if (!response.ok) {
+			throw new Error(`HTTP error! status: ${response.status}`);
+		}
+
+		const data = await response.json();
+		return json(data);
+	} catch (err) {
+		console.error('Error fetching shape data:', err);
+		throw error(500, 'Unable to fetch shape data.');
+	}
+}