import { json } from '@sveltejs/kit';
import type { RequestHandler } from './$types';
import { getVerseForDate } from '$lib/server/daily-verse';
import { getBookById } from '$lib/server/bible';
import { recordEvent } from '$lib/server/stats/events';

export const POST: RequestHandler = async ({ request, locals }) => {
	const body = await request.json();
	const { date, anonymousId } = body;

	if (!date || !/^\d{4}-\d{2}-\d{2}$/.test(date)) {
		return json({ error: 'A valid date (YYYY-MM-DD) is required' }, { status: 400 });
	}

	const dateStr = date;

	const dailyVerse = await getVerseForDate(dateStr);
	const correctBook = getBookById(dailyVerse.bookId) ?? null;

	// Instrumentation B: a player "started" the puzzle for this date. The unique
	// partial index dedupes reloads, so this is safe to call on every load.
	// Never let analytics failures affect the response.
	// Prefer the signed-in user's ID so the started→finished funnel matches
	// completions (which are keyed to the user ID for logged-in players).
	const playerId =
		locals.user?.id ??
		(typeof anonymousId === 'string' && anonymousId.length > 0 ? anonymousId : null);
	if (playerId) {
		void recordEvent({ name: 'verse_served', anonymousId: playerId, date: dateStr });
	}

	return json({
		dailyVerse,
		correctBookId: dailyVerse.bookId,
		correctBook,
	});
};