feat: complete go rewrite

internal/email/email.go

@@ -0,0 +1,81 @@
+package email
+
+import (
+	"fmt"
+	"log"
+	"time"
+
+	"github.com/rideaware/admin-panel/internal/config"
+	"github.com/rideaware/admin-panel/internal/database"
+
+	"github.com/wneessen/go-mail"
+)
+
+func SendUpdate(subject, body string) (string, error) {
+	subscribers, err := database.GetAllEmails()
+	if err != nil {
+		return "Failed to retrieve subscribers", err
+	}
+
+	if len(subscribers) == 0 {
+		return "No subscribers found.", nil
+	}
+
+	for _, email := range subscribers {
+		if !send(subject, body, email) {
+			return fmt.Sprintf("Failed to send to %s", email), nil
+		}
+	}
+
+	if err := database.LogNewsletter(subject, body); err != nil {
+		log.Printf("Error logging newsletter: %v", err)
+	}
+
+	return "Email has been sent to all subscribers.", nil
+}
+
+func send(subject, body, recipient string) bool {
+	cfg := config.Current
+
+	client, err := mail.NewClient(
+		cfg.SMTPServer,
+		mail.WithPort(cfg.SMTPPort),
+		mail.WithSMTPAuth(mail.SMTPAuthPlain),
+		mail.WithUsername(cfg.SMTPUser),
+		mail.WithPassword(cfg.SMTPPassword),
+		mail.WithTimeout(10*time.Second),
+	)
+	if err != nil {
+		log.Printf("Failed to create mail client: %v", err)
+		return false
+	}
+	defer client.Close()
+
+	m := mail.NewMsg()
+	if err := m.From(cfg.SenderEmail); err != nil {
+		log.Printf("Failed to set from: %v", err)
+		return false
+	}
+	if err := m.To(recipient); err != nil {
+		log.Printf("Failed to set to: %v", err)
+		return false
+	}
+	m.Subject(subject)
+
+	unsubLink := fmt.Sprintf("https://%s/unsubscribe?email=%s",
+		cfg.BaseURL, recipient)
+
+	htmlBody := fmt.Sprintf(
+		"%s<br><br>If you ever wish to unsubscribe, "+
+			"please click <a href='%s'>here</a>",
+		body, unsubLink)
+	m.SetBodyString(mail.TypeTextHTML, htmlBody)
+
+	if err := client.Send(m); err != nil {
+		log.Printf("Failed to send email to %s: %v", recipient, err)
+		return false
+	}
+
+	log.Printf("Update email sent to: %s", recipient)
+	return true
+}