import dotenv from 'dotenv';
import { Environment } from '../types';

// Load environment variables from .env file
dotenv.config();

export interface Config {
  port: number;
  nodeEnv: Environment;
  logLevel: 'error' | 'warn' | 'info' | 'debug';
}

// Validate and export environment configuration
export const config: Config = {
  port: Number(process.env.PORT) || 3000,
  nodeEnv: (process.env.NODE_ENV as Environment) || 'development',
  logLevel: (process.env.LOG_LEVEL as Config['logLevel']) || 'info'
};

// Validate required environment variables
if (!config.port || isNaN(config.port)) {
  throw new Error('Invalid PORT configuration');
}

if (!['development', 'staging', 'production'].includes(config.nodeEnv)) {
  throw new Error('Invalid NODE_ENV configuration');
}

if (!['error', 'warn', 'info', 'debug'].includes(config.logLevel)) {
  throw new Error('Invalid LOG_LEVEL configuration');
}