package mailer

import (
	domain "RenewCMS/internal/domain/mail"
	"RenewCMS/internal/infrastructure/config"
	"bytes"
	"embed"
	"html/template"
	"log"

	"gopkg.in/gomail.v2"
)

type MailRepository struct {
	smtp config.SmtpSettings
}

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

func NewMailRepository(smtp config.SmtpSettings) *MailRepository {
	return &MailRepository{smtp: smtp}
}

func (m MailRepository) Send(receiverAddress string, templateName string, data any) error {
	from := m.smtp.Email
	password := m.smtp.Password
	smtpHost := m.smtp.Host
	smtpPort := m.smtp.Port

	d := gomail.NewDialer(smtpHost, smtpPort, from, password)

	tmpl, err := template.ParseFS(mailTemplateFiles, "templates/"+templateName+".html")
	if err != nil {
		log.Println("error when template.ParseFS:", err)
		return err
	}

	var body bytes.Buffer
	err = tmpl.Execute(&body, data)
	if err != nil {
		log.Println("error when tmpl.Execute:", err)
		return err
	}

	msg := gomail.NewMessage()
	msg.SetHeaders(map[string][]string{
		"From":         {"RenewCMS <" + from + ">"},
		"To":           {receiverAddress},
		"MIME-version": {"1.0"},
		"Content-Type": {"text/html"},
		"charset":      {"UTF-8"},
		"Subject":      {"RenewCMS | Action required"},
	})
	msg.SetBody("text/html", body.String())

	if err := d.DialAndSend(msg); err != nil {
		log.Println("error when sending email:", err)
		return err
	}

	return nil
}

var _ domain.Repository = &MailRepository{}