package mail

import (
	"errors"
	"log"
	"os"
	"os/exec"
)

var cm, subjectParam, contentParam, fileParam string

func CheckEnv() error {
	cm = os.Getenv("mail_cmd_path")
	if cm == "" {
		return errors.New("cmd can't empty")
	}
	subjectParam = os.Getenv("mail_cmd_subject_param_name")
	if subjectParam == "" {
		return errors.New("title param name empty")
	}
	contentParam = os.Getenv("mail_cmd_content_param_name")
	if contentParam == "" {
		return errors.New("content param name emtpy")
	}
	fileParam = os.Getenv("mail_cmd_file_param_name")
	if fileParam == "" {
		return errors.New("file empty")
	}
	return nil
}

func SendMail(subject string, content string, files ...string) error {
	v := []string{subjectParam, subject, contentParam, content}
	for _, f := range files {
		if f != "" {
			v = append(v, fileParam, f)
		}
	}

	cmd := exec.Command(cm, v...)
	output, err := cmd.CombinedOutput()
	log.Println(string(output))
	return err
}