import { redirect, error } from '@sveltejs/kit';
import { db } from '$lib/server/db';
import { githubInstallation } from '$lib/server/db/schema';
import { decodeInstallState, getGitHubInstallation } from '$lib/server/github-app';

export const GET = async ({ url, locals }) => {
	const installationId = url.searchParams.get('installation_id');
	const state = decodeInstallState(url.searchParams.get('state') ?? undefined);

	if (!installationId) throw error(400, 'Missing installation_id');
	if (!state.userId) throw error(400, 'Missing install state');
	if (!locals.user || locals.user.id !== state.userId) throw redirect(302, '/auth/login');

	const installation = await getGitHubInstallation(installationId);
	const accountLogin = installation.account?.login ?? 'github';

	await db
		.insert(githubInstallation)
		.values({
			userId: locals.user.id,
			installationId,
			accountLogin
		})
		.onConflictDoUpdate({
			target: githubInstallation.installationId,
			set: {
				userId: locals.user.id,
				accountLogin,
				updatedAt: new Date()
			}
		});

	throw redirect(303, state.redirect);
};