package mail

import (
	"encoding/json"
	"fmt"
	"os"
	"strings"

	"github.com/go-playground/validator/v10"
)

var validate *validator.Validate

type Email struct {
	Path      string
	Sender    string `json:"sender" validate:"required,email"`
	Receivers string `json:"receivers" validate:"required"`
	Subject   string `json:"subject" validate:"required"`
	Content   string `json:"content" validate:"required"`
}

func FromJSON(path string) (Email, error) {
	var mail Email

	content, err := os.ReadFile(path)
	if err != nil {
		return mail, fmt.Errorf("%w, unable to read the file: %s", err, path)
	}

	if err := json.Unmarshal(content, &mail); err != nil {
		return mail, err
	}

	validate = validator.New(validator.WithRequiredStructEnabled())
	if err := validate.Struct(mail); err != nil {
		return mail, err
	}

	return mail, nil
}

func (e Email) GetReceivers() []string {
	return strings.Split(e.Receivers, ",")
}

func (e Email) Generate() []byte {
	mail := fmt.Sprintf(
		"To: %s\nFrom: %s\nContent-Type: text/html;charset=utf-8\nSubject: %s\n\n%s",
		e.Receivers,
		e.Sender,
		e.Subject,
		e.Content,
	)
	return []byte(mail)
}