219 lines
7 KiB
TypeScript
219 lines
7 KiB
TypeScript
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import { DEFAULT_LEG_FACTOR, LEG_FACTORS } from '#shared/emissions'
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import { decodePolyline, thin } from '#shared/polyline'
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import type { Coord, Segment } from '#shared/types'
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interface MotisPlace {
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lat: number
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lon: number
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name?: string
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}
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interface MotisLeg {
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mode: string
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duration?: number
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distance?: number
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startTime: string
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endTime: string
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from: MotisPlace
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to: MotisPlace
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headsign?: string
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routeColor?: string
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routeTextColor?: string
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routeShortName?: string
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routeLongName?: string
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displayName?: string
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agencyName?: string
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agencyUrl?: string
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realTime?: boolean
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legGeometry?: { points: string, precision: number, length: number }
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}
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interface MotisItinerary {
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duration: number
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transfers: number
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legs: MotisLeg[]
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}
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type Family = 'rail' | 'urban' | 'walk'
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const RAIL = new Set(['HIGHSPEED_RAIL', 'LONG_DISTANCE', 'NIGHT_RAIL', 'REGIONAL_RAIL', 'REGIONAL_FAST_RAIL', 'RAIL'])
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const URBAN = new Set(['BUS', 'COACH', 'SUBWAY', 'METRO', 'TRAM', 'TROLLEYBUS'])
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export function family(mode: string): Family {
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if (RAIL.has(mode)) return 'rail'
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if (URBAN.has(mode)) return 'urban'
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return 'walk'
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}
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/** Distance orthodromique entre deux points, en kilometres. */
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export function haversineKm(a: MotisPlace, b: MotisPlace): number {
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const R = 6371.0088
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const rad = (d: number) => (d * Math.PI) / 180
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const dLat = rad(b.lat - a.lat)
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const dLon = rad(b.lon - a.lon)
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const h = Math.sin(dLat / 2) ** 2
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+ Math.cos(rad(a.lat)) * Math.cos(rad(b.lat)) * Math.sin(dLon / 2) ** 2
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return 2 * R * Math.asin(Math.sqrt(h))
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}
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/** Transitous ne renseigne pas toujours distance et duration : on recalcule. */
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export function legKm(leg: MotisLeg): number {
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return leg.distance !== undefined ? leg.distance / 1000 : haversineKm(leg.from, leg.to)
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}
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export function legMin(leg: MotisLeg): number {
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if (leg.duration !== undefined) return leg.duration / 60
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return (Date.parse(leg.endTime) - Date.parse(leg.startTime)) / 60000
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}
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/** Le mode qui pese le plus longtemps decide de la nature du trajet. */
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export function dominant(itinerary: MotisItinerary): Family {
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const weight: Record<Family, number> = { rail: 0, urban: 0, walk: 0 }
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for (const leg of itinerary.legs) weight[family(leg.mode)] += legMin(leg)
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if (weight.rail > 0 && weight.rail >= weight.urban) return 'rail'
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return weight.urban > 0 ? 'urban' : 'walk'
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}
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/** Les couleurs GTFS sont fournies sans diese : « fdc41f » et non « #fdc41f ». */
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function hexColor(raw?: string): string | undefined {
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if (!raw || !/^[0-9a-f]{6}$/i.test(raw)) return undefined
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return `#${raw}`
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}
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/** MOTIS annonce sa precision dans la reponse : on ne la devine jamais. */
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export function legGeometry(leg: MotisLeg): Coord[] | undefined {
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const g = leg.legGeometry
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if (!g?.points) return undefined
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return thin(decodePolyline(g.points, g.precision ?? 5), 400)
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}
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/**
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* Transforme un troncon brut en information affichable.
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* Les marches de moins de deux minutes sont ignorees : elles polluent
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* l'affichage sans rien apprendre au voyageur.
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*/
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export function toSegment(leg: MotisLeg): Segment | null {
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const minutes = Math.round(legMin(leg))
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if (family(leg.mode) === 'walk' && minutes < 2) return null
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// MOTIS nomme les extremites du trajet START et END : sans interet pour l'usager.
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const nom = (p: MotisPlace) => (p.name === 'START' || p.name === 'END' ? '' : p.name ?? '')
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return {
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mode: leg.mode,
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line: leg.displayName || leg.routeShortName || (leg.mode === 'WALK' ? 'Marche' : ''),
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lineLong: leg.routeLongName || undefined,
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operator: leg.agencyName || undefined,
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operatorUrl: leg.agencyUrl || undefined,
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color: hexColor(leg.routeColor),
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textColor: hexColor(leg.routeTextColor),
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headsign: leg.headsign || undefined,
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from: nom(leg.from),
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to: nom(leg.to),
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departure: leg.startTime,
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arrival: leg.endTime,
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// Un troncon dure au moins une minute : afficher « 0 min » n'aide personne.
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durationMin: Math.max(1, minutes),
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realTime: leg.realTime === true,
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geometry: legGeometry(leg),
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}
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}
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export function summarize(itinerary: MotisItinerary, mode: 'train' | 'bus') {
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let km = 0
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let co2 = 0
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const segments: Segment[] = []
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const geometry: Coord[] = []
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for (const leg of itinerary.legs) {
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const d = legKm(leg)
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km += d
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co2 += (LEG_FACTORS[leg.mode] ?? DEFAULT_LEG_FACTOR) * d
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const seg = toSegment(leg)
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if (seg) {
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segments.push(seg)
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if (seg.geometry) geometry.push(...seg.geometry)
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}
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}
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return {
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mode,
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distanceKm: Math.round(km * 10) / 10,
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durationMin: Math.round(itinerary.duration / 60),
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co2Grams: Math.round(co2),
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transfers: itinerary.transfers,
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segments,
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geometry: thin(geometry, 800),
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}
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}
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/**
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* Modes autorises pour chaque famille.
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* Ces listes sont volontairement courtes : mesure faite, ajouter SUBWAY et TRAM
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* a la famille routiere fait passer MOTIS de cinq itineraires a zero. Elargir
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* l'espace de recherche ne l'enrichit pas, il l'empeche d'aboutir.
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*/
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const TRANSIT_MODES = {
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rail: 'HIGHSPEED_RAIL,LONG_DISTANCE,NIGHT_RAIL,REGIONAL_RAIL,REGIONAL_FAST_RAIL,RAIL',
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urban: 'BUS,COACH',
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} as const
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/**
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* Une requete par famille. MOTIS optimise sur la duree : interroge sans
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* contrainte, il ne proposera jamais un car de 4 h la ou un TGV met 1 h 37.
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* C'est en restreignant les modes qu'on obtient une vraie alternative.
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*/
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async function plan(
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from: { lat: number, lon: number },
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to: { lat: number, lon: number },
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departure: Date,
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transitModes: string,
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): Promise<MotisItinerary[]> {
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const params = new URLSearchParams({
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fromPlace: `${from.lat},${from.lon}`,
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toPlace: `${to.lat},${to.lon}`,
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time: departure.toISOString().replace(/\.\d{3}Z$/, 'Z'),
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transitModes,
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})
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const data = await $fetch<{ itineraries?: MotisItinerary[] }>(
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// Les virgules encodees et l'absence d'identification valent un 403.
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`https://api.transitous.org/api/v1/plan?${params.toString().replace(/%2C/g, ',')}`,
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{ headers: { 'User-Agent': 'lecheminvert.tech (adam@belkacemi.me)' } },
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)
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return data.itineraries ?? []
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}
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/**
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* Le plus rapide des itineraires exploitables.
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* Les modes etant deja contraints cote requete, on ne rejette qu'un trajet
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* entierement pietonnier, que MOTIS renvoie parfois faute de mieux.
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*/
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function best(itineraries: MotisItinerary[]): MotisItinerary | undefined {
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return itineraries
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.filter(i => dominant(i) !== 'walk')
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.sort((a, b) => a.duration - b.duration)[0]
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}
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export async function publicTransport(
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from: { lat: number, lon: number },
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to: { lat: number, lon: number },
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departure: Date,
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) {
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// Les deux familles sont interrogees en parallele : une panne d'un cote
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// ne doit pas priver l'utilisateur de l'autre.
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const [rail, urban] = await Promise.allSettled([
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plan(from, to, departure, TRANSIT_MODES.rail),
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plan(from, to, departure, TRANSIT_MODES.urban),
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])
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const railIt = rail.status === 'fulfilled' ? best(rail.value) : undefined
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const urbanIt = urban.status === 'fulfilled' ? best(urban.value) : undefined
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return {
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train: railIt ? summarize(railIt, 'train') : null,
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bus: urbanIt ? summarize(urbanIt, 'bus') : null,
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}
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}
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