refactoring: TypeScript migration, security fixes,

client/src/components/Map/RouteCalculator.ts

@@ -0,0 +1,139 @@
+import type { RouteResult, RouteSegment, Waypoint } from '../../types'
+
+const OSRM_BASE = 'https://router.project-osrm.org/route/v1'
+
+/** Fetches a full route via OSRM and returns coordinates, distance, and duration estimates for driving/walking. */
+export async function calculateRoute(
+  waypoints: Waypoint[],
+  profile: 'driving' | 'walking' | 'cycling' = 'driving',
+  { signal }: { signal?: AbortSignal } = {}
+): Promise<RouteResult> {
+  if (!waypoints || waypoints.length < 2) {
+    throw new Error('At least 2 waypoints required')
+  }
+
+  const coords = waypoints.map((p) => `${p.lng},${p.lat}`).join(';')
+  const url = `${OSRM_BASE}/driving/${coords}?overview=full&geometries=geojson&steps=false`
+
+  const response = await fetch(url, { signal })
+  if (!response.ok) {
+    throw new Error('Route could not be calculated')
+  }
+
+  const data = await response.json()
+
+  if (data.code !== 'Ok' || !data.routes || data.routes.length === 0) {
+    throw new Error('No route found')
+  }
+
+  const route = data.routes[0]
+  const coordinates: [number, number][] = route.geometry.coordinates.map(([lng, lat]: [number, number]) => [lat, lng])
+
+  const distance: number = route.distance
+  let duration: number
+  if (profile === 'walking') {
+    duration = distance / (5000 / 3600)
+  } else if (profile === 'cycling') {
+    duration = distance / (15000 / 3600)
+  } else {
+    duration = route.duration
+  }
+
+  const walkingDuration = distance / (5000 / 3600)
+  const drivingDuration: number = route.duration
+
+  return {
+    coordinates,
+    distance,
+    duration,
+    distanceText: formatDistance(distance),
+    durationText: formatDuration(duration),
+    walkingText: formatDuration(walkingDuration),
+    drivingText: formatDuration(drivingDuration),
+  }
+}
+
+export function generateGoogleMapsUrl(places: Waypoint[]): string | null {
+  const valid = places.filter((p) => p.lat && p.lng)
+  if (valid.length === 0) return null
+  if (valid.length === 1) {
+    return `https://www.google.com/maps/search/?api=1&query=${valid[0].lat},${valid[0].lng}`
+  }
+  const stops = valid.map((p) => `${p.lat},${p.lng}`).join('/')
+  return `https://www.google.com/maps/dir/${stops}`
+}
+
+/** Reorders waypoints using a nearest-neighbor heuristic to minimize total Euclidean distance. */
+export function optimizeRoute(places: Waypoint[]): Waypoint[] {
+  const valid = places.filter((p) => p.lat && p.lng)
+  if (valid.length <= 2) return places
+
+  const visited = new Set<number>()
+  const result: Waypoint[] = []
+  let current = valid[0]
+  visited.add(0)
+  result.push(current)
+
+  while (result.length < valid.length) {
+    let nearestIdx = -1
+    let minDist = Infinity
+    for (let i = 0; i < valid.length; i++) {
+      if (visited.has(i)) continue
+      const d = Math.sqrt(
+        Math.pow(valid[i].lat - current.lat, 2) + Math.pow(valid[i].lng - current.lng, 2)
+      )
+      if (d < minDist) { minDist = d; nearestIdx = i }
+    }
+    if (nearestIdx === -1) break
+    visited.add(nearestIdx)
+    current = valid[nearestIdx]
+    result.push(current)
+  }
+  return result
+}
+
+/** Fetches per-leg distance/duration from OSRM and returns segment metadata (midpoints, walking/driving times). */
+export async function calculateSegments(
+  waypoints: Waypoint[],
+  { signal }: { signal?: AbortSignal } = {}
+): Promise<RouteSegment[]> {
+  if (!waypoints || waypoints.length < 2) return []
+
+  const coords = waypoints.map((p) => `${p.lng},${p.lat}`).join(';')
+  const url = `${OSRM_BASE}/driving/${coords}?overview=false&geometries=geojson&steps=false&annotations=distance,duration`
+
+  const response = await fetch(url, { signal })
+  if (!response.ok) throw new Error('Route could not be calculated')
+
+  const data = await response.json()
+  if (data.code !== 'Ok' || !data.routes?.[0]) throw new Error('No route found')
+
+  const legs = data.routes[0].legs
+  return legs.map((leg: { distance: number; duration: number }, i: number): RouteSegment => {
+    const from: [number, number] = [waypoints[i].lat, waypoints[i].lng]
+    const to: [number, number] = [waypoints[i + 1].lat, waypoints[i + 1].lng]
+    const mid: [number, number] = [(from[0] + to[0]) / 2, (from[1] + to[1]) / 2]
+    const walkingDuration = leg.distance / (5000 / 3600)
+    return {
+      mid, from, to,
+      walkingText: formatDuration(walkingDuration),
+      drivingText: formatDuration(leg.duration),
+    }
+  })
+}
+
+function formatDistance(meters: number): string {
+  if (meters < 1000) {
+    return `${Math.round(meters)} m`
+  }
+  return `${(meters / 1000).toFixed(1)} km`
+}
+
+function formatDuration(seconds: number): string {
+  const h = Math.floor(seconds / 3600)
+  const m = Math.floor((seconds % 3600) / 60)
+  if (h > 0) {
+    return `${h} h ${m} min`
+  }
+  return `${m} min`
+}