factor in who's available to drive when calculating optimal path

src/components/Event/EventCarpools.tsx

@@ -2,14 +2,13 @@ import CancelIcon from '@material-ui/icons/Cancel';
 import CheckIcon from '@material-ui/icons/Check';
 import EmojiPeopleIcon from '@material-ui/icons/EmojiPeople';
 import { useCallback, useContext, useMemo } from 'react';
-import { Location } from '../../lib/estimateoptimalpath';
 import {
 	useCancelCarpoolRequest,
 	useInvitationState,
 	useSendCarpoolRequest,
 } from '../../state/Notifications/NotificationsHooks';
 import { useMe } from '../hooks';
-import { IEvent } from '../types';
+import { IEvent, IEventSignupComplete } from '../types';
 import useOptimalPath from '../useOptimalPath';
 import EventContext from './EventContext';
 import { useMySignup } from './EventHooks';
@@ -34,7 +33,7 @@ function useMemberLocations(members: IEvent['carpools'][0]['members']) {
 						longitude: signup.longitude,
 					};
 				})
-				.filter(Boolean) as Location[],
+				.filter(Boolean) as IEventSignupComplete[],
 		[members, signups]
 	);
 }
@@ -60,37 +59,21 @@ function CarpoolRow({
 		cancelCarpoolRequest(carpool.id);
 	}, [cancelCarpoolRequest, carpool.id]);
 
-	const {
-		event: { latitude, longitude },
-	} = useContext(EventContext);
+	const { event } = useContext(EventContext);
 
 	const mySignup = useMySignup();
 
-	const myLocation =
-		mySignup && mySignup.latitude !== null
-			? {
-					latitude: mySignup.latitude,
-					longitude: mySignup.longitude,
-			  }
-			: null;
-
 	const memberLocations = useMemberLocations(carpool.members);
 
-	const pathInCarpool = useOptimalPath(memberLocations, {
-		latitude,
-		longitude,
-	});
+	const pathInCarpool = useOptimalPath(memberLocations, event);
 
 	const pathNotInCarpool = useOptimalPath(
-		myLocation ? [...memberLocations, myLocation] : [],
-		{
-			latitude,
-			longitude,
-		}
+		mySignup.latitude !== null ? [...memberLocations, mySignup] : [],
+		event
 	);
 
 	const extraDistance =
-		myLocation && pathInCarpool && pathNotInCarpool
+		mySignup.latitude !== null && pathInCarpool && pathNotInCarpool
 			? pathInCarpool.distance - pathNotInCarpool.distance
 			: null;
 

src/components/useOptimalPath.ts

@@ -1,12 +1,10 @@
 import { useDebugValue, useMemo } from 'react';
-import estimateOptimalPath, {
-	Location,
-	Path,
-} from '../lib/estimateoptimalpath';
+import estimateOptimalPath, { Path } from '../lib/estimateoptimalpath';
+import { ICarpool, IEventSignupComplete } from './types';
 
-export default function useOptimalPath<M extends Location, D extends Location>(
-	members: M[],
-	destination: D
+export default function useOptimalPath(
+	members: IEventSignupComplete[],
+	destination: ICarpool['event']
 ) {
 	const path = useMemo(() => {
 		if (members.length === 0) {
@@ -15,13 +13,17 @@ export default function useOptimalPath<M extends Location, D extends Location>(
 
 		// O(n^2)
 		const path = members.reduce((prev, driver) => {
+			if (!driver.canDrive) {
+				return prev;
+			}
+
 			// O(n)
 			const passengerLocations = members.filter(
 				(location) => location !== driver
 			);
 
 			// O(n)
-			const path = estimateOptimalPath<M, D>({
+			const path = estimateOptimalPath({
 				from: driver,
 				waypoints: passengerLocations,
 				to: destination,
@@ -36,7 +38,7 @@ export default function useOptimalPath<M extends Location, D extends Location>(
 			}
 
 			return prev;
-		}, null! as { path: Path<M, D>; distance: number });
+		}, null! as { path: Path<IEventSignupComplete, ICarpool['event']>; distance: number });
 
 		return path;
 	}, [destination, members]);

src/lib/estimateoptimalpath.ts

@@ -1,3 +1,4 @@
+import { ICarpool, IEventSignupComplete } from '../components/types';
 import getDistance from './getdistance';
 
 export type Location = {
@@ -11,13 +12,10 @@ export type Path<M extends Location, D extends Location> = {
 	to: D;
 };
 
-export default function estimateOptimalPath<
-	M extends Location,
-	D extends Location
->(
-	path: Path<M, D>
+export default function estimateOptimalPath(
+	path: Path<IEventSignupComplete, ICarpool['event']>
 ): {
-	path: Path<M, D>;
+	path: Path<IEventSignupComplete, ICarpool['event']>;
 	distance: number;
 } {
 	const { from, to, waypoints } = path;
@@ -51,7 +49,7 @@ export default function estimateOptimalPath<
 		path: {
 			from,
 			to,
-			waypoints: newWaypoints as M[],
+			waypoints: newWaypoints as IEventSignupComplete[],
 		},
 		distance: getDistance(from, ...sequence, to),
 	};