import dotenv from 'dotenv';

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

/**
 * Environment configuration interface
 */
export interface EnvConfig {
  /**
   * MCP server URL
   * @default 'http://localhost:3000'
   */
  mcpServerUrl: string;

  /**
   * AWS region to use
   * @default 'us-east-1'
   */
  awsRegion: string;

  /**
   * Connection timeout in milliseconds
   * @default 10000
   */
  connectionTimeout: number;

  /**
   * Log level (debug, info, warn, error)
   * @default 'info'
   */
  logLevel: 'debug' | 'info' | 'warn' | 'error';
}

/**
 * Default configuration values
 */
const DEFAULT_CONFIG: EnvConfig = {
  mcpServerUrl: 'http://localhost:3000',
  awsRegion: 'us-east-1',
  connectionTimeout: 10000,
  logLevel: 'info',
};

/**
 * Load environment configuration with defaults
 * @returns Configuration with defaults applied
 */
export function loadEnvConfig(): EnvConfig {
  return {
    mcpServerUrl: process.env.MCP_SERVER_URL || DEFAULT_CONFIG.mcpServerUrl,
    awsRegion: process.env.AWS_REGION || DEFAULT_CONFIG.awsRegion,
    connectionTimeout: process.env.CONNECTION_TIMEOUT 
      ? parseInt(process.env.CONNECTION_TIMEOUT, 10) 
      : DEFAULT_CONFIG.connectionTimeout,
    logLevel: (process.env.LOG_LEVEL as EnvConfig['logLevel']) || DEFAULT_CONFIG.logLevel,
  };
}

/**
 * Get AWS credential status from environment variables
 * @returns Object describing AWS credential availability
 */
export function getAwsCredentialStatus(): Record<string, string | boolean> {
  return {
    AWS_REGION: process.env.AWS_REGION ? 'Set' : 'Not set',
    AWS_ACCESS_KEY_ID: process.env.AWS_ACCESS_KEY_ID 
      ? `Set (${process.env.AWS_ACCESS_KEY_ID.substring(0, 4)}...)` 
      : 'Not set',
    AWS_SECRET_ACCESS_KEY: process.env.AWS_SECRET_ACCESS_KEY 
      ? `Set (${process.env.AWS_SECRET_ACCESS_KEY.length} chars)` 
      : 'Not set',
    AWS_SESSION_TOKEN: process.env.AWS_SESSION_TOKEN 
      ? `Set (${process.env.AWS_SESSION_TOKEN.length} chars)` 
      : 'Not set',
    AWS_PROFILE: process.env.AWS_PROFILE ? 'Set' : 'Not set',
  };
}