const dotenv = require('dotenv');
const path = require('path');

// Load environment variables
dotenv.config({ path: path.join(__dirname, '../../../.env') });

const config = {
  app: {
    env: process.env.NODE_ENV || 'development',
    port: parseInt(process.env.PORT || '3000', 10),
    logLevel: process.env.LOG_LEVEL || 'info',
  },
  auth: {
    adminPasswordHash: process.env.ADMIN_PASSWORD_HASH,
    jwtSecret: process.env.JWT_SECRET,
    sessionTimeout: parseInt(process.env.SESSION_TIMEOUT || '1800', 10),
  },
  security: {
    enableIpRestriction: process.env.ENABLE_IP_RESTRICTION === 'true',
    allowedIps: process.env.ALLOWED_IPS ? process.env.ALLOWED_IPS.split(',').map(ip => ip.trim()) : [],
  },
  minio: {
    defaultAlias: process.env.DEFAULT_MINIO_ALIAS || 'minio',
    endpoint: process.env.MINIO_ENDPOINT,
    accessKey: process.env.MINIO_ACCESS_KEY,
    secretKey: process.env.MINIO_SECRET_KEY,
  },
  email: {
    host: process.env.SMTP_HOST,
    port: parseInt(process.env.SMTP_PORT || '587', 10),
    secure: process.env.SMTP_SECURE === 'true',
    auth: {
      user: process.env.SMTP_USER,
      pass: process.env.SMTP_PASS,
    },
    from: process.env.REPORT_SENDER,
    to: process.env.REPORT_RECIPIENT,
  },
  reports: {
    schedule: process.env.REPORT_SCHEDULE || '0 0 * * 1',
  },
  redis: {
    host: process.env.REDIS_HOST || 'localhost',
    port: parseInt(process.env.REDIS_PORT || '6379', 10),
    password: process.env.REDIS_PASSWORD,
  },
};

// Validate required configuration
const validateConfig = () => {
  const required = [
    'auth.adminPasswordHash',
    'auth.jwtSecret',
    'minio.defaultAlias',
  ];

  const missing = [];
  required.forEach(key => {
    const keys = key.split('.');
    let value = config;
    keys.forEach(k => {
      value = value[k];
    });
    if (!value) {
      missing.push(key);
    }
  });

  if (missing.length > 0) {
    throw new Error(`Missing required configuration: ${missing.join(', ')}`);
  }
};

// Only validate in production
if (config.app.env === 'production') {
  validateConfig();
}

module.exports = config;