// place files you want to import through the `$lib` alias in this folder.
import path from 'path';
import bunyan from 'bunyan';
import type { MaybePromise } from '@sveltejs/kit';

export const log = bunyan.createLogger({
	name: 'fotochallenge',
	level: process.env.NODE_ENV === 'production' ? 'info' : 'debug',
	src: true,
});

function safePath(basePath: string, name: string): boolean {
	const fullPath = `${basePath}/${name}`;
	const relative = path.relative(basePath, fullPath);
	return (
		!!relative &&
		// does move out of `basePath`
		!relative.startsWith(`..${path.sep}`) &&
		// exactly one layer deep, e.g. no `./uplodas/foo/bar`
		!relative.includes(path.sep) &&
		// result is not an absolute path
		!path.isAbsolute(relative)
	);
}

const defaultPath: string = './uploads';
if (!('STORAGE_PATH' in process.env)) {
	log.warn(`'STORAGE_PATH' environment variable is not set. Defaulting to ${defaultPath}`);
}
export const storagePath: string = process.env.STORAGE_PATH ?? defaultPath;

export const requestIdHeader = 'x-request-id';

export default safePath;

export async function timedExecution<T>(
	fn: () => MaybePromise<T>
): Promise<{ executionTime: number; result: T }> {
	const start = process.hrtime();
	const result = await fn();
	const end = process.hrtime(start);
	const executionTime = (end[0] * 1e6 + end[1]) / 1e6;
	return { executionTime, result };
}