Added streak counter

src/routes/api/streak/+server.ts

@@ -0,0 +1,36 @@
+import { json, error } from '@sveltejs/kit';
+import type { RequestHandler } from './$types';
+import { db } from '$lib/server/db';
+import { dailyCompletions } from '$lib/server/db/schema';
+import { eq, desc } from 'drizzle-orm';
+
+export const GET: RequestHandler = async ({ url }) => {
+	const anonymousId = url.searchParams.get('anonymousId');
+	const localDate = url.searchParams.get('localDate');
+
+	if (!anonymousId || !localDate) {
+		error(400, 'Missing anonymousId or localDate');
+	}
+
+	// Fetch all completion dates for this user, newest first
+	const rows = await db
+		.select({ date: dailyCompletions.date })
+		.from(dailyCompletions)
+		.where(eq(dailyCompletions.anonymousId, anonymousId))
+		.orderBy(desc(dailyCompletions.date));
+
+	const completedDates = new Set(rows.map((r) => r.date));
+
+	// Walk backwards from localDate, counting consecutive completed days
+	let streak = 0;
+	let cursor = new Date(`${localDate}T00:00:00`);
+
+	while (true) {
+		const dateStr = cursor.toLocaleDateString('en-CA'); // YYYY-MM-DD
+		if (!completedDates.has(dateStr)) break;
+		streak++;
+		cursor.setDate(cursor.getDate() - 1);
+	}
+
+	return json({ streak });
+};