config.ts

import dotenv from 'dotenv';
import path from 'path';

function getEnvironmentFilePath(): string {
  switch (process.env.NODE_ENV) {
    case 'production':
    case 'development':
      return '.env';
    case 'local_development':
      return '.env.local_development';
    case 'local_production':
      return '.env.local_production';
    case 'local':
      return '.env.local';
    default:
      return '.env';
  }
}

dotenv.config({
  path: path.resolve(getEnvironmentFilePath()),
});

function required<T>(key: string, defaultValue?: string): T {
  if (!IS_TEST && (typeof process.env[key] === 'undefined' && typeof defaultValue === 'undefined' || process.env[key] === '')) {
    throw new Error('Missing required environment variable: ' + key);
  }
  return process.env[key] as T || defaultValue as T;
}

export const IS_PRODUCTION = process.env.NODE_ENV === 'production';
export const IS_TEST = process.env.NODE_ENV === 'test';
export const IS_LOCAL = process.env.NODE_ENV ? process.env.NODE_ENV.toString().startsWith('local') : false;

export const config = {
  NODE_ENV: required<string>('NODE_ENV'),
  MYSQL: {
    HOST: required<string>('MYSQL_HOST'),
    PORT: required<number>('MYSQL_PORT'),
    USER: required<string>('MYSQL_USER'),
    PASSWORD: required<string>('MYSQL_PASSWORD'),
    DATABASE: required<string>('MYSQL_DATABASE'),
  },
  JWT_SECRET: required<string>('JWT_SECRET'),
  AES_SECRET: required<string>('AES_SECRET'),
  AWS: {
    CLOUDWATCH: {
      ACCESS_KEY_ID: required<string>('AWS_CLOUDWATCH_ACCESS_KEY_ID'),
      SECRET_ACCESS_KEY: required<string>('AWS_CLOUDWATCH_SECRET_ACCESS_KEY'),
    },
  },
};

console.log(`[CONFIGURATION] Initialized from ${getEnvironmentFilePath()}`);
console.log(`[CONFIGURATION] RUNNING NODE ENV: ${config.NODE_ENV}`);
console.log(`[CONFIGURATION] RUNNING MYSQL DB HOST: ${config.MYSQL.HOST}`);