import { firstOfMaybeArray } from '@wener/utils';
import { App, Contexts } from '../../app';
import type { AuditData } from './types';

export function collectAuditData<T extends AuditData>(data: T): T {
	data.requestId ||= Contexts.requestId.get();
	data.userId ||= Contexts.userId.get();
	data.sessionId ||= Contexts.sessionId.get();
	data.clientId ||= Contexts.clientId.get();

	const meta = (data.metadata ||= {});
	const req = Contexts.request.get();
	if (req) {
		const { ip, method, url, originalUrl, path = originalUrl } = req as any;
		const userAgent = (req as any).headers?.['user-agent'] || '';
		data.clientAgent = userAgent;
		// https://github.com/pbojinov/request-ip/blob/master/src/index.js#L55
		data.clientIp =
			ip ||
			firstOfMaybeArray(req.headers?.['cf-connecting-ip']) ||
			firstOfMaybeArray(req.headers?.['x-client-ip']) ||
			firstOfMaybeArray(req.headers?.['cf-pseudo-ipv4']) ||
			firstOfMaybeArray(req.headers?.['x-forwarded-for']) ||
			req.socket.remoteAddress;
		meta.method = method;
		meta.path = path;
		if (url !== path) {
			meta.url = url;
		}
		// fixme conditional
		meta.headers = req.headers;
	}

	data.instanceId ||= App.instanceId;
	return data;
}

interface _KnownHttpMetadata {
	method?: string;
	path?: string;
	url?: string;
	headers?: Record<string, string | string[]>;
}