import fs from 'node:fs/promises';
import { Logger } from '@nestjs/common';
import dotenv from 'dotenv';

/**
 * Load `.env[.{name.env|name|profile|env}][.local]`
 */
export async function loadEnvs({
	log = new Logger(loadEnvs.name),
	name,
	mode = process.env.NODE_ENV,
	env = process.env.APP_ENV,
	profiles = process.env.NODE_PROFILES?.split(',').filter(Boolean) || [],
}: {
	name?: string;
	mode?: string; // NODE_ENV - What mode is current running
	env?: string; // APP_ENV - Which env we want to run in
	profiles?: string[];
	log?: Logger;
} = {}) {
	profiles = profiles.filter(Boolean);

	const files = [`.env.local`, '.env'];
	if (mode === env) {
		env = undefined;
	}
	if (mode) {
		files.unshift(`.env.${mode}.local`, `.env.${mode}`);
	}
	if (env) {
		files.unshift(`.env.${env}.local`, `.env.${env}`);
	}
	for (let profile of profiles) {
		files.unshift(`.env.${profile}.local`, `.env.${profile}`);
	}
	if (name) {
		files.unshift(`.env.${name}.local`, `.env.${name}`);
		if (mode) {
			files.unshift(`.env.${name}.${mode}.local`, `.env.${name}.${mode}`);
		}
		for (let profile of profiles) {
			files.unshift(`.env.${name}.${profile}.local`, `.env.${name}.${profile}`);
		}
	}
	for (const v of files) {
		try {
			await fs.stat(v);
		} catch (_e) {
			continue;
		}
		if (!dotenv.config({ path: v }).error) {
			log.log(`Load env from ${v}`);
		}
	}
}