package main

import (
  "github.com/wneessen/go-mail"
  "fmt"
  "context"
  "github.com/redis/go-redis/v9"
  "time"
  "encoding/json"
  "MY/webapp/data"
)

func SendEmail(msg data.EmailMessage) {
  email_msg := mail.NewMsg()
  err := email_msg.From(msg.From)
  if err != nil { panic(err) }

  err = email_msg.To(msg.To)
  if err != nil { panic(err) }

  email_msg.Subject(msg.Subject)
  email_msg.SetBodyString(mail.TypeTextPlain, msg.Text)
  email_msg.SetBodyString(mail.TypeTextHTML, msg.HTML)

  client, err := mail.NewClient("localhost",
    mail.WithPort(1025),
    mail.WithTLSPolicy(mail.NoTLS))

  if err != nil { panic(err) }

  err = client.DialAndSend(email_msg)
  if err != nil { panic(err) }
}

func LoadMessage(result string) data.EmailMessage {
  var msg data.EmailMessage

  err := json.Unmarshal([]byte(result), &msg)
  if err != nil { panic(err) }

  return msg
}

func EmailListener(ctx context.Context) {
  client := redis.NewClient(&redis.Options{
    Addr: "127.0.0.1:6379",
    Password: "",
    DB: 0,
  })

  for {
    result, err := client.BRPop(ctx, 0, "queue").Result()

    if err != nil { panic(err) }

    fmt.Printf("received: %v\n", result)

    // NOTE: 0=queue name, 1=message
    msg := LoadMessage(result[1])

    SendEmail(msg)

    fmt.Println("SENT EMAIL")
  }
}

func main() {
  ctx := context.Background()

  go EmailListener(ctx)

  time.Sleep(time.Second * 100)
}