require("dotenv").config({
  path: `.env.${process.env.NODE_ENV || "development"}`,
});

// Add warning if .env file doesn't exist for current environment
const fs = require("fs");
const currentEnvFile = `.env.${process.env.NODE_ENV || "development"}`;
if (!fs.existsSync(currentEnvFile)) {
  console.warn(
    `⚠️  Warning: Environment file ${currentEnvFile} not found. Using default values.`
  );
}

module.exports = {
  env: process.env.NODE_ENV || "development",

  email: {
    user: process.env.EMAIL_USER,
    pass: process.env.EMAIL_PASS,
    testMode: process.env.EMAIL_TEST_MODE === "true",
    testLimit: process.env.EMAIL_TEST_LIMIT
      ? parseInt(process.env.EMAIL_TEST_LIMIT, 10)
      : null,
  },

  campaigns: {
    testMode: process.env.CAMPAIGN_TEST_MODE === "true",
    testDataFile: process.env.CAMPAIGN_TEST_DATA || "tests/test-campaigns.json",
  },

  attachments: {
    enabled: process.env.ATTACHMENT_ENABLED === "true",
    files: process.env.ATTACHMENT_FILES
      ? process.env.ATTACHMENT_FILES.split(",").map((f) => f.trim())
      : [],
  },

  gif: {
    enabled: process.env.GIF_ENABLED === "true",
    url:
      process.env.GIF_URL ||
      "https://media.giphy.com/media/3o7abKhOpu0NwenH3O/giphy.gif",
    alt: process.env.GIF_ALT || "Professional handshake",
  },

  app: {
    delayMinutes: parseInt(process.env.DELAY_MINUTES || "5", 10),
    batchSize: parseInt(process.env.BATCH_SIZE || "10", 10),
  },

  rateLimiting: {
    enabled: process.env.RATE_LIMITING_ENABLED !== "false", // Default true
    maxPerHour: parseInt(process.env.MAX_EMAILS_PER_HOUR || "15", 10),
    pauseEvery: parseInt(process.env.PAUSE_EVERY_N_EMAILS || "50", 10),
    pauseDuration: parseInt(process.env.PAUSE_DURATION_MINUTES || "30", 10),
  },

  errorHandling: {
    enabled: process.env.ERROR_HANDLING_ENABLED !== "false", // Default true
    maxRetries: parseInt(process.env.MAX_RETRIES || "3", 10),
    retryDelay: parseInt(process.env.RETRY_BASE_DELAY || "60", 10), // seconds
    logFailures: process.env.LOG_FAILURES !== "false", // Default true
  },

  logging: {
    level: process.env.LOG_LEVEL || "info",
    debug: process.env.DEBUG === "true",
  },

  tracking: {
    enabled: process.env.TRACKING_ENABLED === "true",
    skipTracking: process.env.SKIP_TRACKING === "true",
    port: parseInt(process.env.TRACKING_PORT || "3000", 10),
    domain: process.env.TRACKING_DOMAIN || "http://localhost:3000",
  },

  smtp: {
    host: process.env.SMTP_HOST,
    port: parseInt(process.env.SMTP_PORT || "587", 10),
    secure: process.env.SMTP_SECURE === "true",
    user: process.env.SMTP_USER,
    pass: process.env.SMTP_PASS,
  },

  isDevelopment: process.env.NODE_ENV === "development",
  isProduction: process.env.NODE_ENV === "production",
};