import { PUBLIC_SUPABASE_URL, PUBLIC_SUPABASE_ANON_KEY } from '$env/static/public';
import { createServerClient } from '@supabase/ssr';
import type { Handle } from '@sveltejs/kit';
import type { Database } from '$lib/types/supabase';

export const handle: Handle = async ({ event, resolve }) => {
	event.locals.supabase = createServerClient<Database>(
		PUBLIC_SUPABASE_URL,
		PUBLIC_SUPABASE_ANON_KEY,
		{
			cookies: {
				getAll: () => event.cookies.getAll(),
				/**
				 * SvelteKit's cookies API requires `path` to be explicitly set in
				 * the cookie options. Setting `path` to `/` replicates previous/
				 * standard behavior.
				 */
				setAll: (cookiesToSet) => {
					cookiesToSet.forEach(({ name, value, options }) => {
						event.cookies.set(name, value, { ...options, path: '/' });
					});
				}
			}
		}
	);

	/**
	 * Unlike `supabase.auth.getSession()`, which returns the session _without_
	 * validating the JWT, this function also calls `getUser()` to validate the
	 * JWT before returning the session.
	 */
	event.locals.safeGetSession = async () => {
		const {
			data: { session }
		} = await event.locals.supabase.auth.getSession();
		if (!session) {
			return { session: null, user: null };
		}

		const {
			data: { user },
			error
		} = await event.locals.supabase.auth.getUser();
		if (error) {
			// JWT validation has failed
			return { session: null, user: null };
		}

		return { session, user };
	};

	return resolve(event, {
		filterSerializedResponseHeaders(name) {
			return name === 'content-range' || name === 'x-supabase-api-version';
		}
	});
};