import { fail, redirect } from '@sveltejs/kit';
import { env } from '$env/dynamic/private';
import { createApiClient } from '$lib/api.server';
import { parseBackendError, getErrorMessage } from '$lib/errors';

export async function load({
	fetch,
	locals,
	url
}: {
	fetch: typeof globalThis.fetch;
	locals: App.Locals;
	url: URL;
}) {
	const canWrite =
		locals.user?.groups?.some((g: { permissions: string[] }) =>
			g.permissions.includes('WRITE_ALL')
		) ?? false;
	if (!canWrite) throw redirect(303, '/');

	const senderId = url.searchParams.get('senderId') || '';
	const receiverId = url.searchParams.get('receiverId') || '';

	const api = createApiClient(fetch);

	let initialSenderName = '';
	let initialReceivers: { id: string; firstName: string; lastName: string }[] = [];

	const requests: Promise<void>[] = [];

	if (senderId) {
		requests.push(
			api.GET('/api/persons/{id}', { params: { path: { id: senderId } } }).then(({ data }) => {
				if (data) initialSenderName = `${data.firstName} ${data.lastName}`;
			})
		);
	}

	if (receiverId) {
		requests.push(
			api.GET('/api/persons/{id}', { params: { path: { id: receiverId } } }).then(({ data }) => {
				if (data)
					initialReceivers = [{ id: data.id!, firstName: data.firstName, lastName: data.lastName }];
			})
		);
	}

	const [personsResult] = await Promise.all([api.GET('/api/persons'), ...requests]);

	return {
		persons: personsResult.response.ok ? personsResult.data : [],
		initialSenderId: senderId,
		initialSenderName,
		initialReceivers
	};
}

export const actions = {
	default: async ({ request, fetch }) => {
		const baseUrl = env.API_INTERNAL_URL || 'http://localhost:8080';
		const formData = await request.formData();

		const res = await fetch(`${baseUrl}/api/documents`, {
			method: 'POST',
			body: formData
		});

		if (!res.ok) {
			const backendError = await parseBackendError(res);
			return fail(res.status, { error: getErrorMessage(backendError?.code) });
		}

		const created = await res.json();
		throw redirect(303, `/documents/${created.id}`);
	}
};