// A representation of how the EmailTemplate struct looks like. The one used below is genereted with ProtoBuf
type EmailTemplate struct {
	Email    string
	Params   map[string]string
	Template EmailTemplate_TemplateType // An enum that contains the different templates
}

// Send will send a email to the user with instructions to reset their password
// Returns if it's successfull or not
func (c *EmailTemplateClient) Send(emailTemplate *emailservice.EmailTemplate) (bool, error) {

	templateID, err := c.getTemplateID(emailTemplate.Template)
	if err != nil {
		log.Warnf("Failed to match template %s to an id", emailTemplate.Template.String())
		return false, ErrNoTemplateFound
	}

	sendgridAPIKey := os.Getenv("SENDGRID_API_KEY")
	if sendgridAPIKey == "" {
		log.Warnf("No SendGrid API Key found when trying to send template %s", emailTemplate.Template.String())
		return false, ErrNoAPIKey
	}

	from := mail.NewEmail("Wiseer", "noreply@wiseer.io")
	to := mail.NewEmail(emailTemplate.Email, emailTemplate.Email)

	message := mail.NewV3Mail()
	message.SetFrom(from)
	message.SetTemplateID(templateID)

	p := mail.NewPersonalization()
	p.AddTos(to)
	for key, value := range emailTemplate.Params {
		p.SetDynamicTemplateData(key, value)
	}
	message.AddPersonalizations(p)

	client := sendgrid.NewSendClient(sendgridAPIKey)
	response, err := client.Send(message)
	if err != nil {
		log.Errorf("Failed to send email template %s. %s", emailTemplate.Template.String(), err.Error())
		return false, err
	}
	if response.StatusCode > 299 {
		log.Errorf("Failed to send email template %s. Status %d, Body %s", emailTemplate.Template.String(), response.StatusCode, response.Body)
		if response.StatusCode == 401 {
			return false, ErrInvalidAPIKey
		}
		return false, ErrFailedToSend
	}

	log.Infof("Successfully sent email template %s, status %d", emailTemplate.Template.String(), response.StatusCode)
	return true, nil
}