import { fail } from '@sveltejs/kit';
import { env } from '$env/dynamic/private';
import { parseBackendError } from '$lib/shared/errors';
import type { Actions, PageServerLoad } from './$types';
import type { components } from '$lib/generated/api';

export interface InviteListItem {
	id: string;
	code: string;
	displayCode: string;
	label?: string;
	useCount: number;
	maxUses?: number;
	expiresAt?: string;
	revoked: boolean;
	status: string;
	createdAt: string;
	shareableUrl: string;
}

export type UserGroup = components['schemas']['UserGroup'];

export const load: PageServerLoad = async ({ url, fetch }) => {
	const status = url.searchParams.get('status') ?? 'active';
	const apiUrl = env.API_INTERNAL_URL || 'http://localhost:8080';

	const [invitesRes, groupsRes] = await Promise.all([
		fetch(`${apiUrl}/api/invites?status=${encodeURIComponent(status)}`),
		fetch(`${apiUrl}/api/groups`)
	]);

	let invites: InviteListItem[] = [];
	let loadError: string | null = null;
	if (!invitesRes.ok) {
		const backendError = await parseBackendError(invitesRes);
		loadError = backendError?.code ?? 'INTERNAL_ERROR';
	} else {
		invites = await invitesRes.json();
	}

	let groups: UserGroup[] = [];
	let groupsLoadError: string | null = null;
	if (!groupsRes.ok) {
		const backendError = await parseBackendError(groupsRes);
		groupsLoadError = backendError?.code ?? 'INTERNAL_ERROR';
	} else {
		const raw: UserGroup[] = await groupsRes.json();
		groups = [...raw].sort((a, b) => a.name.localeCompare(b.name));
	}

	return { invites, status, loadError, groups, groupsLoadError };
};

export const actions = {
	create: async ({ request, fetch }) => {
		const formData = await request.formData();
		const label = (formData.get('label') as string) || undefined;
		const maxUsesRaw = formData.get('maxUses') as string;
		const maxUses = maxUsesRaw ? parseInt(maxUsesRaw, 10) : undefined;
		const prefillFirstName = (formData.get('prefillFirstName') as string) || undefined;
		const prefillLastName = (formData.get('prefillLastName') as string) || undefined;
		const prefillEmail = (formData.get('prefillEmail') as string) || undefined;
		const expiresAt = (formData.get('expiresAt') as string) || undefined;
		const groupIds = formData.getAll('groupIds') as string[];

		const apiUrl = env.API_INTERNAL_URL || 'http://localhost:8080';
		const res = await fetch(`${apiUrl}/api/invites`, {
			method: 'POST',
			headers: { 'Content-Type': 'application/json' },
			body: JSON.stringify({
				label,
				maxUses,
				prefillFirstName,
				prefillLastName,
				prefillEmail,
				expiresAt,
				groupIds
			})
		});

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

		const created: InviteListItem = await res.json();
		return { created };
	},

	revoke: async ({ request, fetch }) => {
		const formData = await request.formData();
		const id = formData.get('id') as string;

		const apiUrl = env.API_INTERNAL_URL || 'http://localhost:8080';
		const res = await fetch(`${apiUrl}/api/invites/${encodeURIComponent(id)}`, {
			method: 'DELETE'
		});

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

		return { revoked: id };
	}
} satisfies Actions;