feat: migrate Flask API to Go with JWT auth

internal/email/service.go

@@ -0,0 +1,82 @@
+package email
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/resend/resend-go/v2"
+)
+
+type Service struct {
+	client *resend.Client
+	from   string
+}
+
+func NewService() *Service {
+	senderEmail := os.Getenv("SENDER_EMAIL")
+	if senderEmail == "" {
+		senderEmail = "noreply@rideaware.app"
+	}
+
+	apiKey := os.Getenv("RESEND_API_KEY")
+	if apiKey == "" {
+		apiKey = "re_test"
+	}
+
+	return &Service{
+		client: resend.NewClient(apiKey),
+		from:   senderEmail,
+	}
+}
+
+func (s *Service) SendPasswordResetEmail(email, username, resetLink string) error {
+	params := &resend.SendEmailRequest{
+		From:    s.from,
+		To:      []string{email},
+		Subject: "Reset Your RideAware Password",
+		Html: fmt.Sprintf(`
+			<h2>Password Reset Request</h2>
+			<p>Hi %s,</p>
+			<p>We received a request to reset your password. Click the link below to create a new password:</p>
+			<p><a href="%s">Reset Password</a></p>
+			<p>This link will expire in 1 hour.</p>
+			<p>If you didn't request this, you can ignore this email.</p>
+		`, username, resetLink),
+	}
+
+	sent, err := s.client.Emails.Send(params)
+	if err != nil {
+		return fmt.Errorf("failed to send email: %w", err)
+	}
+
+	if sent.Id == "" {
+		return fmt.Errorf("failed to send email")
+	}
+
+	return nil
+}
+
+func (s *Service) SendWelcomeEmail(email, username string) error {
+	params := &resend.SendEmailRequest{
+		From:    s.from,
+		To:      []string{email},
+		Subject: "Welcome to RideAware",
+		Html: fmt.Sprintf(`
+			<h2>Welcome to RideAware</h2>
+			<p>Hi %s,</p>
+			<p>Your account has been created successfully!</p>
+			<p>Start tracking your rides and improve your performance.</p>
+		`, username),
+	}
+
+	sent, err := s.client.Emails.Send(params)
+	if err != nil {
+		return fmt.Errorf("failed to send email: %w", err)
+	}
+
+	if sent.Id == "" {
+		return fmt.Errorf("failed to send email")
+	}
+
+	return nil
+}