Refine response status, integrate configuration fetching, location checks ^& exception handling

src/pages/api/cron.ts

@@ -1,15 +1,26 @@
+import { getMatchingTime } from '@/timing';
 // Next.js API route support: https://nextjs.org/docs/api-routes/introduction
 import type { NextApiRequest, NextApiResponse } from 'next';
 import { getDistance } from '@/location';
 import { env } from '@/env/server.mjs';
 import monitorAsync from '@/monitor';
+import { sendNotification } from '@/notify';
+import { fetchConfiguration, checkIdentifier, markIdentifier } from '@/db';
 
 type ResponseData = {
 	diff: number;
 	inRange: boolean;
 };
 
-type StatusData = { status: string };
+type StatusData = { status: ResponseStatus };
+
+type ResponseStatus =
+	| 'unauthorized'
+	| 'out-of-range'
+	| 'no-matching-time'
+	| 'already-notified'
+	| 'notified'
+	| 'error';
 
 const center = {
 	latitude: env.CENTER_LATITUDE,
@@ -22,28 +33,64 @@ export default async function handler(
 ) {
 	if (req.query.key != env.API_KEY) {
 		// auth failed
-		res.status(401).json({ status: 'Unauthorized' });
+		res.status(401).json({ status: 'unauthorized' });
 		return;
 	}
 
-	async function innerFunction() {
-		const diff = await getDistance();
-		// auth passed
-		res.setHeader(
-			'Cache-Control',
-			`max-age=0, s-maxage=${env.EDGE_CACHE_TIME_SECONDS}, stale-while-revalidate`
-		);
-		res
-			.status(200)
-			.json({ diff, inRange: diff < env.MAX_DISTANCE, status: 'Success' });
+	async function innerFunction(): Promise<ResponseStatus> {
+		const now = new Date();
+
+		const config = await fetchConfiguration({
+			times: [
+				{
+					time: '03:13',
+					maxLate: '00:10',
+					days: [
+						'monday',
+						'tuesday',
+						'wednesday',
+						'thursday',
+						'friday',
+						'saturday',
+						'sunday'
+					],
+					name: 'B'
+				},
+				{
+					time: '23:26',
+					maxLate: '00:10',
+					days: ['monday', 'tuesday', 'wednesday', 'thursday', 'friday'],
+					name: 'A'
+				}
+			]
+		});
+		const matching = await getMatchingTime(config, now);
+
+		// No matching time - no notification to send.
+		if (matching == null) return 'no-matching-time';
+
+		// Check if I am in range of the center
+		const distanceToCenter = await getDistance();
+		if (distanceToCenter > 280) return 'out-of-range';
+
+		// Check if I have already been notified
+		if (await checkIdentifier(matching.name, now)) return 'already-notified';
+
+		// Send notification, mark
+		await sendNotification(`The bus is leaving soon. (${matching.name}))`);
+		await markIdentifier(matching.name, true, 60 * 60 * 24 * 31, now);
+
+		return 'notified';
 	}
 
 	try {
+		let result;
 		if (process.env.NODE_ENV === 'production')
-			await monitorAsync(innerFunction);
-		else await innerFunction();
+			result = await monitorAsync(innerFunction);
+		else result = await innerFunction();
+		res.status(200).json({ status: result });
 	} catch (e) {
 		console.error(e);
-		res.status(500).json({ status: 'Error' });
+		res.status(500).json({ status: 'error' });
 	}
 }