From dcda74d61d2aac939f9b8313247528c26bf47559 Mon Sep 17 00:00:00 2001
From: Kevin Wu <kevinwu098@gmail.com>
Date: Sun, 21 Jul 2024 17:58:58 -0700
Subject: [PATCH] feat: actually extract hooks

---
 src/app/pages/Events/useEvents.js | 47 +++++++++++++++++++++++++++++++
 src/app/pages/Events/utils.js     | 46 ++++++++++++++++++++++++++++++
 2 files changed, 93 insertions(+)
 create mode 100644 src/app/pages/Events/useEvents.js
 create mode 100644 src/app/pages/Events/utils.js

diff --git a/src/app/pages/Events/useEvents.js b/src/app/pages/Events/useEvents.js
new file mode 100644
index 00000000..389d2207
--- /dev/null
+++ b/src/app/pages/Events/useEvents.js
@@ -0,0 +1,47 @@
+import { useState, useEffect, useCallback } from "react";
+import { parseEvents, joinEvents } from "./utils.js";
+import EVENT_DATA from "assets/data/events/all.json";
+import { client } from "sanity-client.js";
+
+const legacyEvents = parseEvents(EVENT_DATA); // events from manual JSON file
+
+export const useEvents = () => {
+	const [events, setEvents] = useState([]);
+
+	const fetchEvents = useCallback(async () => {
+		const result = await client.fetch(
+			`*[_type == "event"] | order(time desc)`,
+			{},
+		);
+		return result.map((item) => ({
+			title: item.title,
+			time: item.time,
+			duration: item.duration,
+			type: item.type,
+			desc: item.desc,
+			place: item.place,
+			links: item.links
+				? item.links.map((linkItem) => ({
+						label: linkItem.label,
+						link: linkItem.link,
+					}))
+				: [],
+		}));
+	}, []);
+
+	useEffect(() => {
+		const getEvents = async () => {
+			try {
+				const data = await fetchEvents();
+				const eventData = parseEvents(data);
+				const joinedEvents = joinEvents(eventData, legacyEvents);
+				setEvents(joinedEvents);
+			} catch (e) {
+				console.error(e);
+			}
+		};
+		getEvents();
+	}, [fetchEvents, legacyEvents]);
+
+	return events;
+};
diff --git a/src/app/pages/Events/utils.js b/src/app/pages/Events/utils.js
new file mode 100644
index 00000000..eede8f3b
--- /dev/null
+++ b/src/app/pages/Events/utils.js
@@ -0,0 +1,46 @@
+export const parseEvents = (events) => {
+	let eventData = {
+		upcoming: [],
+		past: [],
+	};
+
+	const now = new Date();
+
+	for (let event of events) {
+		const eventTime = new Date(
+			new Date(event.time).getTime() + event.duration * 60000,
+		);
+
+		if (now < eventTime) {
+			eventData.upcoming.unshift(event);
+		} else {
+			eventData.past.push(event);
+		}
+	}
+
+	return eventData;
+};
+
+export const joinEvents = (a, b) => {
+	// handle uninitialized/unparsed event lists
+	a = a.upcoming && a.past ? a : { upcoming: [], past: [] };
+	b = b.upcoming && b.past ? b : { upcoming: [], past: [] };
+
+	const combinedUpcoming = [...a.upcoming, ...b.upcoming];
+	const combinedPast = [...a.past, ...b.past];
+
+	let nextEvent = null;
+
+	if (combinedUpcoming.length > 0) {
+		combinedUpcoming.sort(
+			(e1, e2) => new Date(e1.time) - new Date(e2.time),
+		);
+		nextEvent = combinedUpcoming.at(0) ?? null;
+	}
+
+	return {
+		upcoming: combinedUpcoming,
+		past: combinedPast,
+		next: nextEvent,
+	};
+};