package smtpclient

import (
	"bytes"
	"embed"
	"errors"
	"fmt"
	"html/template"
	"strings"
)

type SMTPClient struct{}

//go:embed template/*
var templates embed.FS

func (s SMTPClient) SendMail(templateName string, to string, data any) error {
	if to == "error@error.error" {
		return errors.New("error mail send")
	}
	return nil
}

func NewDummySMTPClient() SMTPClient {
	s := SMTPClient{}
	return s
}

func (s SMTPClient) renderTemplates(templateName string, data any) (string, string, string, error) {
	subject, err := s.renderFile(fmt.Sprintf("%v.subject", templateName), data)
	if err != nil {
		return "", "", "", err
	}
	txt, err := s.renderFile(fmt.Sprintf("%v.txt", templateName), data)
	if err != nil {
		return "", "", "", err
	}

	html, err := s.renderFile(fmt.Sprintf("%v.html", templateName), data)
	if err != nil {
		return "", "", "", err
	}

	return subject, txt, html, nil
}

func (s SMTPClient) renderFile(filename string, data any) (string, error) {
	tmpl, err := template.ParseFS(templates, "template/"+filename)
	if err != nil {
		return "", err
	}

	var buf bytes.Buffer
	err = tmpl.Execute(&buf, data)
	if err != nil {
		return "", err
	}

	renderedString := buf.String()
	return strings.Trim(renderedString, "\n"), nil
}