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/**
 * Google Apps Script for Automatic Out of Office Replies
 * Works: 5pm-9am on weekdays and entire weekends
 */

// SETTINGS - Customize according to your needs
const OOO_SETTINGS = {
  // Working hours (24-hour format)
  workStartHour: 9,  // 9am
  workEndHour: 17,   // 5pm

  // Out of office message
  oooMessage: {
    subject: "Auto-Reply: Out of Office",
    body: `
Hello,

Thank you for your email. I am currently out of office.

Office Hours: Monday-Friday, 9:00-17:00

I will respond as soon as possible during business hours.

For urgent matters, please contact [ADD YOUR PHONE NUMBER HERE].

Best regards,
[YOUR NAME HERE]

---
This is an automated response.
    `
  },

  // Label to track which emails have already been replied to
  labelName: "OutOfOffice-AutoReplied"
};

/**
 * Main function that checks and sends out of office replies
 */
function checkAndSendOOOReplies() {
  try {
    // Check if we are out of office hours
    if (!isOutOfOffice()) {
      console.log("We are within business hours - not sending OOO replies");
      return;
    }

    console.log("Out of office hours - checking for new emails");

    // Find or create the label
    const label = getOrCreateLabel(OOO_SETTINGS.labelName);

    // Get new emails (last 2 hours, without our label)
    const query = `is:unread -label:${OOO_SETTINGS.labelName} newer_than:2h`;
    const threads = GmailApp.search(query, 0, 50);

    console.log(`Found ${threads.length} new emails`);

    threads.forEach(thread => {
      const messages = thread.getMessages();
      const lastMessage = messages[messages.length - 1];

      // Check if the email is incoming (not from us)
      if (lastMessage.getFrom().includes(Session.getActiveUser().getEmail())) {
        console.log("Skipping email that we sent");
        return;
      }

      // Send the auto-reply
      sendOOOReply(lastMessage);

      // Add the label so we don't send again
      thread.addLabel(label);

      console.log(`Sent OOO reply to: ${lastMessage.getFrom()}`);
    });

  } catch (error) {
    console.error("Error in checkAndSendOOOReplies:", error);
  }
}

/**
 * Checks if we are out of office hours
 */
function isOutOfOffice() {
  const now = new Date();
  const day = now.getDay(); // 0 = Sunday, 1 = Monday, etc
  const hour = now.getHours();

  // Weekend (Saturday = 6, Sunday = 0)
  if (day === 0 || day === 6) {
    return true;
  }

  // Weekdays outside office hours
  if (hour < OOO_SETTINGS.workStartHour || hour >= OOO_SETTINGS.workEndHour) {
    return true;
  }

  return false;
}

/**
 * Sends the out of office reply
 */
function sendOOOReply(originalMessage) {
  try {
    const originalSubject = originalMessage.getSubject();
    const senderEmail = originalMessage.getFrom();

    // Check if it's already an auto-reply to avoid loops
    if (originalSubject.toLowerCase().includes('auto-reply') ||
        originalSubject.toLowerCase().includes('out of office') ||
        originalSubject.toLowerCase().includes('automated response')) {
      console.log("Skipping auto-reply message");
      return;
    }

    // Create the reply
    const replySubject = `${OOO_SETTINGS.oooMessage.subject}`;

    GmailApp.sendEmail(
      senderEmail,
      replySubject,
      OOO_SETTINGS.oooMessage.body,
      {
        replyTo: Session.getActiveUser().getEmail(),
        htmlBody: OOO_SETTINGS.oooMessage.body.replace(/\n/g, '<br>')
      }
    );

  } catch (error) {
    console.error("Error in sendOOOReply:", error);
  }
}

/**
 * Finds or creates label
 */
function getOrCreateLabel(labelName) {
  let label = GmailApp.getUserLabelByName(labelName);
  if (!label) {
    label = GmailApp.createLabel(labelName);
    console.log(`Created new label: ${labelName}`);
  }
  return label;
}

/**
 * Test function to try the script
 */
function testScript() {
  console.log("=== SCRIPT TEST ===");
  console.log("Current time:", new Date());
  console.log("We are out of office hours:", isOutOfOffice());

  // Test trigger
  checkAndSendOOOReplies();
}