import { json, error } from '@sveltejs/kit';
import { getDb, row, toArr } from '$lib/server/db';
import { requireAuth } from '$lib/server/auth';

export async function GET({ request, params }) {
	const u = await requireAuth(request);
	const db = getDb();
	const termin = db.prepare(
		'SELECT * FROM termine WHERE id = ? AND verein_id = ?'
	).get(params.id, u.verein_id);
	if (!termin) throw error(404, 'Termin nicht gefunden');
	return json(row(termin as Record<string, unknown>));
}

export async function PUT({ request, params }) {
	const u = await requireAuth(request);
	const db = getDb();

	const existing = db.prepare(
		'SELECT id FROM termine WHERE id = ? AND verein_id = ?'
	).get(params.id, u.verein_id);
	if (!existing) throw error(404, 'Termin nicht gefunden');

	const body = await request.json();

	db.prepare(`
		UPDATE termine SET
			titel = ?, beschreibung = ?, beginn = ?, ende = ?,
			ort = ?, ort_id = ?, gruppe_ids = ?, durchfuehrender_id = ?,
			verfuegbarkeit = ?, rrule = ?, serie_id = ?,
			updated = strftime('%Y-%m-%dT%H:%M:%SZ','now')
		WHERE id = ? AND verein_id = ?
	`).run(
		body.titel,
		body.beschreibung ?? null,
		body.beginn,
		body.ende ?? null,
		body.ort ?? null,
		body.ort_id ?? null,
		toArr(body.gruppe_ids),
		body.durchfuehrender_id ?? null,
		body.verfuegbarkeit ?? 'offen',
		body.rrule ?? null,
		body.serie_id ?? null,
		params.id,
		u.verein_id
	);

	const termin = db.prepare('SELECT * FROM termine WHERE id = ?').get(params.id);
	return json(row(termin as Record<string, unknown>));
}

export async function DELETE({ request, params, url }) {
	const u = await requireAuth(request);
	const db = getDb();

	const deleteSerie = url.searchParams.get('serie') === 'true';

	if (deleteSerie) {
		const termin = db.prepare(
			'SELECT serie_id FROM termine WHERE id = ? AND verein_id = ?'
		).get(params.id, u.verein_id) as { serie_id: string | null } | undefined;

		if (!termin) throw error(404, 'Termin nicht gefunden');

		if (termin.serie_id) {
			db.prepare(
				'DELETE FROM termine WHERE serie_id = ? AND verein_id = ?'
			).run(termin.serie_id, u.verein_id);
		} else {
			db.prepare(
				'DELETE FROM termine WHERE id = ? AND verein_id = ?'
			).run(params.id, u.verein_id);
		}
	} else {
		const result = db.prepare(
			'DELETE FROM termine WHERE id = ? AND verein_id = ?'
		).run(params.id, u.verein_id);
		if (result.changes === 0) throw error(404, 'Termin nicht gefunden');
	}

	return new Response(null, { status: 204 });
}