main.go

package main

import (
    "fmt"
    "log"
    "net/smtp"
    "regexp"
    "strings"

    "github.com/openai/openai-go/v2"
    "github.com/emersion/go-imap"
    "github.com/emersion/go-imap/client"
)

func main() {
    // Authenticate with the email server
    auth := smtp.PlainAuth("", "user@example.com", "password", "mail.example.com")

    // Connect to the email server
    imapClient, err := client.DialTLS("mail.example.com:993", nil)
    if err != nil {
        log.Fatal(err)
    }
    defer imapClient.Logout()

    // Login to the email server
    if err := imapClient.Login("user@example.com", "password"); err != nil {
        log.Fatal(err)
    }

    // Select the inbox mailbox
    inbox, err := imapClient.Select("INBOX", false)
    if err != nil {
        log.Fatal(err)
    }

    // Define the search criteria for new messages
    sinceDate := "01-Jan-2022" // Replace with the desired date
    searchCriteria := imap.NewSearchCriteria().Since(sinceDate)

    // Search for new messages in the inbox
    messageSeqNums, err := inbox.Search(searchCriteria)
    if err != nil {
        log.Fatal(err)
    }

    // Iterate over the new messages and generate email replies
    for _, seqNum := range messageSeqNums {
        // Fetch the message
        msg, err := inbox.Fetch(seqNum, imap.FetchEnvelope|imap.FetchBody)
        if err != nil {
            log.Fatal(err)
        }

        // Extract relevant information from the message
        fromEmail := msg.Envelope.From[0].Address
        fromName := msg.Envelope.From[0].PersonalName
        subject := msg.Envelope.Subject
        body := string(msg.Body)

        // Check if the sender is in the user's contacts and generate the email reply using ChatGPT4
        if senderInContacts(fromEmail) {
            label := getLabelForSender(fromEmail)
            if label != "" {
                // Generate email reply using ChatGPT4
                reply := generateReply(body, label, fromName)

                // Send the email reply
                to := []string{fromEmail}
                subject := "Re: " + subject
                body := reply
                err := smtp.SendMail("mail.example.com:587", auth, "user@example.com", to, []byte("Subject: "+subject+"\r\n\r\n"+body))
                if err != nil {
                    log.Fatal(err)
                }

                // Mark the message as answered
                err = inbox.Store(seqNum, imap.FormatFlagsOp(imap.AddFlags, true), []interface{}{imap.AnsweredFlag})
                if err != nil {
                    log.Fatal(err)
                }

                fmt.Printf("Replied to message from %s <%s>\n", fromName, fromEmail)
            }
        }
    }
}

// Helper function to check if the sender's email address is in the user's contacts
func senderInContacts(senderEmail string) bool {
    // TODO: Implement a database or a file to store the user's contacts and their labels
    return true
}

// Helper function to get the label or tag associated with the sender's email address
func getLabelForSender(senderEmail string) string {
    // TODO: Implement a database or a     // file to store the user's contacts and their labels
    return "Friend"
}

// Helper function to generate the email reply using ChatGPT4
func generateReply(emailBody string, label string, senderName string) string {
    client, err := openai.NewClient("YOUR_API_KEY_HERE")
    if err != nil {
        log.Fatal(err)
    }

    prompt := fmt.Sprintf("Dear %s,\n\nThank you for your email. ", senderName)
    if label == "Friend" {
        prompt += "How's your day going? "
    } else if label == "Coworker" {
        prompt += "Regarding your question, "
    } else if label == "Family" {
        prompt += "I hope everything is well with you and your family. "
    }
    prompt += "Here's my reply:\n\n"

    // Remove quoted text and signature from the email body
    re := regexp.MustCompile(`(?s)On .* wrote:(.*)$|--\n.*`)
    emailBody = re.ReplaceAllString(emailBody, "")

    // Generate email reply using ChatGPT4
    response, err := client.Completions.Create(
        &openai.CompletionRequest{
            Model:     "text-davinci-002",
            Prompt:    prompt + emailBody,
            MaxTokens: 1024,
        },
    )
    if err != nil {
        log.Fatal(err)
    }

    return strings.TrimSpace(response.Choices[0].Text)
}