package mail

import (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"strings"
)

type Email struct {
	Sender    string   `json:"sender"`
	Receivers []string `json:"receivers"`
	Subject   string   `json:"subject"`
	Content   string   `json:"content"`
}

func NewEmail(sender string, receivers []string, subject, content string) Email {
	return Email{
		Sender:    sender,
		Receivers: receivers,
		Subject:   subject,
		Content:   content,
	}
}

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

	content, err := ioutil.ReadFile(path)
	if err != nil {
		return mail, err
	}

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

	return mail, nil
}

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