package service

import (
	"context"
	"fmt"
	"log/slog"
	"net/smtp"
	"spend-sparrow/internal/types"
)

type Mail interface {
	// Sending an email is a fire and forget operation. Thus no error handling
	SendMail(ctx context.Context, to string, subject string, message string)
}

type MailImpl struct {
	server *types.Settings
}

func NewMail(server *types.Settings) MailImpl {
	return MailImpl{server: server}
}

func (m MailImpl) SendMail(ctx context.Context, to string, subject string, message string) {
	go m.internalSendMail(ctx, to, subject, message)
}

func (m MailImpl) internalSendMail(ctx context.Context, to string, subject string, message string) {
	if m.server.Smtp == nil {
		return
	}

	s := m.server.Smtp

	auth := smtp.PlainAuth("", s.User, s.Pass, s.Host)

	msg := fmt.Sprintf(
		`From: %v <%v>
		To: %v
		Subject: %v
		MIME-version: 1.0;
		Content-Type: text/html; charset="UTF-8";

		%v`,
		s.FromName,
		s.FromMail,
		to,
		subject,
		message)

	slog.InfoContext(ctx, "sending mail", "to", to)
	err := smtp.SendMail(s.Host+":"+s.Port, auth, s.FromMail, []string{to}, []byte(msg))
	if err != nil {
		slog.ErrorContext(ctx, "Error sending mail", "err", err)
	}
}