Refactor API types and sync logic

Rename and refactor the types passed over the API to be based on an
entity that's either living or a tombstone.  A living entity has a
deleted property that's either undefined or false, while a tombstone
has a deleted property set to true.  All entities have a numeric id
and an updatedAt timestamp.

To sync entities, an array of replacements are passed around. Living
entities are replaced with tombstones when they're deleted. And
tombstones are replaced with living entities when restored.

server/utils/schedule.ts

@@ -1,24 +1,61 @@
-import { Account } from '~/shared/types/account';
-import { Schedule } from '~/shared/types/schedule';
 import { readSchedule, writeSchedule } from '~/server/database';
-import { broadcastUpdate } from '~/server/streams';
+import { broadcastEvent } from '~/server/streams';
+import type { ApiAccount, ApiSchedule } from '~/shared/types/api';
 
-export async function updateScheduleInterestedCounts(accounts: Account[]) {
-	const counts = new Map();
-	for (const account of accounts)
-		if (account.interestedIds)
-			for (const id of account.interestedIds)
-				counts.set(id, (counts.get(id) ?? 0) + 1);
+export async function updateScheduleInterestedCounts(accounts: ApiAccount[]) {
+	const eventCounts = new Map<number, number>();
+	const eventSlotCounts = new Map<number, number>();
+	for (const account of accounts) {
+		if (account.interestedEventIds)
+			for (const id of account.interestedEventIds)
+				eventCounts.set(id, (eventCounts.get(id) ?? 0) + 1);
+		if (account.interestedEventSlotIds)
+			for (const id of account.interestedEventSlotIds)
+				eventSlotCounts.set(id, (eventSlotCounts.get(id) ?? 0) + 1);
+	}
 
 	const schedule = await readSchedule();
-	for (const event of schedule.events) {
-		event.interested = counts.get(event.id);
+	if (schedule.deleted) {
+		throw new Error("Deleted schedule not implemented");
+	}
+	const update: ApiSchedule = {
+		id: schedule.id,
+		updatedAt: new Date().toISOString(),
+		events: [],
+	};
+	const updatedFrom = schedule.updatedAt;
+	for (const event of schedule.events ?? []) {
+		let modified = false;
+		if (event.deleted)
+			continue;
+
+		let count = eventCounts.get(event.id);
+		if (count !== event.interested) {
+			event.interested = eventCounts.get(event.id);
+			modified = true;
+		}
 		for (const slot of event.slots) {
-			slot.interested = counts.get(slot.id);
+			let slotCount = eventSlotCounts.get(slot.id);
+			if (slotCount !== slot.interested) {
+				slot.interested = slotCount;
+				modified = true;
+			}
+		}
+		if (modified) {
+			event.updatedAt = update.updatedAt;
+			update.events!.push(event);
 		}
 	}
+	if (!update.events!.length) {
+		return; // No changes
+	}
+	schedule.updatedAt = updatedFrom;
 	await writeSchedule(schedule);
-	await broadcastUpdate(schedule);
+	await broadcastEvent({
+		type: "schedule-update",
+		updatedFrom,
+		data: update,
+	});
 }
 
 export function canSeeCrew(accountType: string | undefined) {
@@ -26,17 +63,28 @@ export function canSeeCrew(accountType: string | undefined) {
 }
 
 /** Filters out crew visible only parts of schedule */
-export function filterSchedule(schedule: Schedule): Schedule {
+export function filterSchedule(schedule: ApiSchedule): ApiSchedule {
+	if (schedule.deleted) {
+		return schedule;
+	}
 	return {
+		id: schedule.id,
+		updatedAt: schedule.updatedAt,
 		locations: schedule.locations,
-		events: schedule.events
-			.filter(event => !event.crew)
-			.map(event => ({
-				...event,
-				slots: event.slots.map(slot => ({
-					...slot,
-					assigned: undefined,
-				})),
+		events: (schedule.events ?? [])
+			.map(event => (
+				event.deleted
+					? event
+					: event.crew
+						// Pretend crew events are deleted.
+						? { id: event.id, deleted: true, updatedAt: event.updatedAt }
+						: {
+							...event,
+							slots: event.slots.map(slot => ({
+								...slot,
+								assigned: undefined,
+						}
+				)),
 			})),
 	}
 }

server/utils/session.ts

@@ -1,5 +1,5 @@
 import type { H3Event } from "h3";
-import { nextSessionId, readSessions, readSubscriptions, ServerSession, writeSessions, writeSubscriptions } from "~/server/database";
+import { nextSessionId, readSessions, readSubscriptions, type ServerSession, writeSessions, writeSubscriptions } from "~/server/database";
 
 const oneYearSeconds = 365 * 24 * 60 * 60;