require('dotenv').config();

const env = {
    NODE_ENV: process.env.NODE_ENV || 'development',
    PORT: process.env.PORT || 3000,
    
    // JWT Configuration
    JWT_SECRET: process.env.JWT_SECRET,
    JWT_EXPIRES_IN: process.env.JWT_EXPIRES_IN || '24h',
    
    // Email Configuration
    EMAIL_USER: process.env.EMAIL_USER,
    EMAIL_PASS: process.env.EMAIL_PASS,
    EMAIL_HOST: process.env.EMAIL_HOST || 'smtp.gmail.com',
    EMAIL_PORT: process.env.EMAIL_PORT || 587,
    BACK_URL: process.env.BACK_URL,
    
    // Database Configuration
    DB_HOST: process.env.DB_HOST,
    DB_USER: process.env.DB_USER,
    DB_PASSWORD: process.env.DB_PASSWORD,
    DB_NAME: process.env.DB_NAME,
    
    // API Configuration
    SPURRIN_API_URL: process.env.SPURRIN_API_URL,
    SPURRIN_API_KEY: process.env.SPURRIN_API_KEY
};

// Group required environment variables by feature
const requiredEnvVars = {
    email: ['EMAIL_USER', 'EMAIL_PASS', 'EMAIL_HOST', 'BACK_URL'],
    database: ['DB_HOST', 'DB_USER', 'DB_PASSWORD', 'DB_NAME'],
    jwt: ['JWT_SECRET'],
    api: ['SPURRIN_API_URL', 'SPURRIN_API_KEY']
};

// Validate required environment variables based on feature
const validateEnvVars = (feature) => {
    const vars = requiredEnvVars[feature] || [];
    const missingVars = vars.filter(envVar => !env[envVar]);
    
    if (missingVars.length > 0) {
        throw new Error(`Missing required environment variables for ${feature}: ${missingVars.join(', ')}`);
    }
};

// Export validation function along with env object
module.exports = {
    env,
    validateEnvVars
};