/**
 * Core configuration module for the Stock Bot platform using Yup
 */
import path from 'node:path';
import { config as dotenvConfig } from 'dotenv';

/**
 * Represents an error related to configuration validation
 */
export class ConfigurationError extends Error {
  constructor(message: string) {
    super(message);
    this.name = 'ConfigurationError';
  }
}

/**
 * Environment types
 */
export enum Environment {
  Development = 'development',
  Testing = 'testing',
  Staging = 'staging',
  Production = 'production',
}

/**
 * Loads environment variables from .env files based on the current environment
 */
export function loadEnvVariables(envOverride?: string): void {
  const env = envOverride || process.env.NODE_ENV || 'development';
  console.log(`Current environment: ${env}`);
  // Order of loading:
  // 1. .env (base environment variables)
  // 2. .env.{environment} (environment-specific variables)
  // 3. .env.local (local overrides, not to be committed)

  const envFiles = ['.env', `.env.${env}`, '.env.local'];

  for (const file of envFiles) {
    dotenvConfig({ path: path.resolve(process.cwd(), file) });
  }
}

/**
 * Gets the current environment from process.env.NODE_ENV
 */
export function getEnvironment(): Environment {
  const env = process.env.NODE_ENV?.toLowerCase() || 'development';
  switch (env) {
    case 'development':
      return Environment.Development;
    case 'testing':
    case 'test': // Handle both 'test' and 'testing' for compatibility
      return Environment.Testing;
    case 'staging':
      return Environment.Staging;
    case 'production':
      return Environment.Production;
    default:
      return Environment.Development;
  }
}