import dotenv from 'dotenv';
import type { Config } from './types.js';

dotenv.config();

function env(key: string, fallback?: string): string {
  const val = process.env[key];
  if (val !== undefined) return val;
  if (fallback !== undefined) return fallback;
  throw new Error(`Missing required environment variable: ${key}`);
}

function envInt(key: string, fallback: number): number {
  const val = process.env[key];
  return val ? parseInt(val, 10) : fallback;
}

export function loadConfig(cliUrls?: string[]): Config {
  const envUrls = process.env['TRADE_URLS']
    ? process.env['TRADE_URLS'].split(',').map((u) => u.trim())
    : [];

  const tradeUrls = cliUrls && cliUrls.length > 0 ? cliUrls : envUrls;

  return {
    tradeUrls,
    poe2LogPath: env(
      'POE2_LOG_PATH',
      'C:\\Program Files (x86)\\Steam\\steamapps\\common\\Path of Exile 2\\logs\\Client.txt',
    ),
    poe2WindowTitle: env('POE2_WINDOW_TITLE', 'Path of Exile 2'),
    browserUserDataDir: env('BROWSER_USER_DATA_DIR', './browser-data'),
    travelTimeoutMs: envInt('TRAVEL_TIMEOUT_MS', 15000),
    stashScanTimeoutMs: envInt('STASH_SCAN_TIMEOUT_MS', 10000),
    waitForMoreItemsMs: envInt('WAIT_FOR_MORE_ITEMS_MS', 20000),
    betweenTradesDelayMs: envInt('BETWEEN_TRADES_DELAY_MS', 5000),
  };
}