refactor: decompose backend services and routes for maintainability

backend/src/services/notifications/state.ts

@@ -0,0 +1,93 @@
+import { existsSync, readFileSync, writeFileSync } from "node:fs";
+import { resolve } from "node:path";
+import { eq } from "drizzle-orm";
+import { db } from "../../db/client.js";
+import { getDataDir } from "../../db/db-utils.js";
+import { userSettings } from "../../db/schema.js";
+import {
+	createDefaultReminderState,
+	getTodayInTimezone,
+	parseReminderState,
+	type ReminderState,
+} from "../../utils/scheduler-utils.js";
+
+const reminderStateFile = resolve(getDataDir(), "reminder-state.json");
+
+export function loadReminderState(): ReminderState {
+	try {
+		if (existsSync(reminderStateFile)) {
+			return parseReminderState(readFileSync(reminderStateFile, "utf-8"));
+		}
+	} catch {
+		// ignore
+	}
+	return createDefaultReminderState();
+}
+
+export function saveReminderState(state: ReminderState): void {
+	writeFileSync(reminderStateFile, JSON.stringify(state, null, 2));
+}
+
+export function getReminderState(): ReminderState {
+	return loadReminderState();
+}
+
+export function updateReminderSentTime(
+	type: "stock" | "intake" | "prescription" = "stock",
+	channel: "email" | "push" | "both" = "email"
+): void {
+	const state = loadReminderState();
+	const today = getTodayInTimezone();
+	saveReminderState({
+		...state,
+		lastAutoEmailSent: new Date().toISOString(),
+		lastAutoEmailDate: today,
+		lastNotificationType: type,
+		lastNotificationChannel: channel,
+	});
+}
+
+// Stock and intake reminders are tracked separately so neither overwrites the other.
+export async function updateUserReminderSentTime(
+	userId: number,
+	type: "stock" | "intake" | "prescription" = "stock",
+	channel: "email" | "push" | "both" = "email",
+	medName?: string,
+	takenBy?: string
+): Promise<void> {
+	const now = new Date().toISOString();
+	if (type === "stock") {
+		await db
+			.update(userSettings)
+			.set({
+				lastStockReminderSent: now,
+				lastStockReminderChannel: channel,
+				lastStockReminderMedNames: medName ?? null,
+			})
+			.where(eq(userSettings.userId, userId));
+		return;
+	}
+
+	if (type === "prescription") {
+		await db
+			.update(userSettings)
+			.set({
+				lastPrescriptionReminderSent: now,
+				lastPrescriptionReminderChannel: channel,
+				lastPrescriptionReminderMedNames: medName ?? null,
+			})
+			.where(eq(userSettings.userId, userId));
+		return;
+	}
+
+	await db
+		.update(userSettings)
+		.set({
+			lastAutoEmailSent: now,
+			lastNotificationType: type,
+			lastNotificationChannel: channel,
+			lastReminderMedName: medName ?? null,
+			lastReminderTakenBy: takenBy ?? null,
+		})
+		.where(eq(userSettings.userId, userId));
+}