import { existsSync, readFileSync } from 'node:fs';
import { dirname, resolve } from 'node:path';
import { fileURLToPath } from 'node:url';

const serverDir = dirname(fileURLToPath(import.meta.url));
// The server now lives at `<repo>/demos/dating/server/`, so the repo
// root is three levels up — not two as it was when the server lived
// at `<repo>/servers/dating/`. Loading `.env`/`.env.local` from both
// the repo root and the server directory keeps either location valid.
const rootDir = resolve(serverDir, '../../..');

loadEnvFile(resolve(rootDir, '.env'));
loadEnvFile(resolve(rootDir, '.env.local'));
loadEnvFile(resolve(serverDir, '.env'));
loadEnvFile(resolve(serverDir, '.env.local'));

export const config = {
	host: process.env.DATING_SERVER_HOST || '127.0.0.1',
	port: readPort(process.env.DATING_SERVER_PORT, 8787),
	allowedOrigins: readList(
		process.env.DATING_ALLOWED_ORIGINS,
		['http://localhost:5173', 'http://127.0.0.1:5173']
	),
	cookieName: process.env.DATING_SESSION_COOKIE || 'dating_session',
	secureCookies: process.env.DATING_SECURE_COOKIES === 'true',
	pocketBaseUrl: stripTrailingSlash(
		process.env.POCKETBASE_URL || process.env.PUBLIC_POCKETBASE_URL || 'http://127.0.0.1:8090'
	),
	pocketBaseSuperuserEmail: requireEnv('POCKETBASE_SUPERUSER_EMAIL'),
	pocketBaseSuperuserPassword: requireEnv('POCKETBASE_SUPERUSER_PASSWORD')
};

function loadEnvFile(file) {
	if (!existsSync(file)) return;
	const text = readFileSync(file, 'utf8');
	for (const rawLine of text.split(/\r?\n/)) {
		const line = rawLine.trim();
		if (!line || line.startsWith('#')) continue;
		const eq = line.indexOf('=');
		if (eq === -1) continue;
		const key = line.slice(0, eq).trim();
		const value = unquote(line.slice(eq + 1).trim());
		if (key && process.env[key] == null) {
			process.env[key] = value;
		}
	}
}

function unquote(value) {
	if (
		(value.startsWith('"') && value.endsWith('"')) ||
		(value.startsWith("'") && value.endsWith("'"))
	) {
		return value.slice(1, -1);
	}
	return value;
}

function readPort(value, fallback) {
	const port = Number(value);
	return Number.isInteger(port) && port > 0 && port < 65536 ? port : fallback;
}

function readList(value, fallback) {
	if (!value) return fallback;
	return value
		.split(',')
		.map((item) => item.trim())
		.filter(Boolean);
}

function stripTrailingSlash(value) {
	return value.replace(/\/+$/, '');
}

function requireEnv(name) {
	const value = process.env[name];
	if (!value) {
		throw new Error(`Missing required env var ${name}`);
	}
	return value;
}