// env-loader.js
// This module is responsible for loading environment variables from .env file

// Store environment variables in a global object
window.ENV_CONFIG = {};

// Function to load environment variables from .env file
async function loadEnvVariables() {
  try {
    // Fetch the .env file as text
    const response = await fetch('/.env');
    
    if (!response.ok) {
      console.warn('Could not load .env file. Using default values.');
      setDefaultEnvValues();
      return;
    }
    
    const envText = await response.text();
    
    // Parse the .env file content
    const envVars = parseEnvFile(envText);
    
    // Store in the global ENV_CONFIG object
    window.ENV_CONFIG = { ...window.ENV_CONFIG, ...envVars };
    
    console.log('Environment variables loaded successfully');
  } catch (error) {
    console.error('Error loading environment variables:', error);
    setDefaultEnvValues();
  }
}

// Parse .env file content into key-value pairs
function parseEnvFile(envText) {
  const envVars = {};
  
  // Split by lines and process each line
  envText.split('\n').forEach(line => {
    // Skip empty lines and comments
    if (!line || line.trim().startsWith('#')) return;
    
    // Extract key-value pairs
    const match = line.match(/^\s*([\w.-]+)\s*=\s*(.*)?\s*$/);
    if (match) {
      const key = match[1];
      let value = match[2] || '';
      
      // Remove quotes if present
      if (value.startsWith('"') && value.endsWith('"')) {
        value = value.slice(1, -1);
      }
      
      envVars[key] = value;
    }
  });
  
  return envVars;
}

// Set default values for required environment variables
function setDefaultEnvValues() {
  window.ENV_CONFIG = {
    ...window.ENV_CONFIG,
    PUBLIC_VAPID_KEY: 'your_public_vapid_key_here',
    BACKEND_URL: 'https://your-push-server.example.com'
  };
  console.log('Using default environment values');
}

// Export function to initialize environment variables
export async function initEnv() {
  await loadEnvVariables();
  return window.ENV_CONFIG;
}

// Auto-initialize when imported
initEnv();

// Export access functions for environment variables
export function getEnv(key, defaultValue = '') {
  return window.ENV_CONFIG[key] || defaultValue;
}

export default {
  initEnv,
  getEnv
};