package restic

import (
	"encoding/json"
	"errors"
	"fmt"
	"github.com/rs/zerolog/log"
	"os"
)

type Config struct {
	Repository        string `json:"repository"`
	Backup            string `json:"backup"`
	BackupTimeInHours int    `json:"backupTimeInHours"`
}

const (
	DefaultBackupTimeInHours int    = 24
	ShortTimeFormat          string = "2006-01-02T15:04:05"
)

var home, _ = os.UserHomeDir()
var executable, _ = os.Executable()
var isDev = os.Getenv("RESTICTRAY_DEV")

func IsDev() bool {
	return isDev != ""
}

func PasswordFile() string {
	return home + "/.restic/password.txt"
}

func LogFile() string {
	return home + "/.restic/log.txt"
}

func ExcludeFile() string {
	return home + "/.restic/excludes.txt"
}

func ConfigFile() string {
	return home + "/.restic/config.json"
}

func (cnf *Config) MountDir() string {
	return home + "/.restic/mnt"
}

func (cnf *Config) CreateMountDirIfDoesntExist() error {
	if _, err := os.Stat(cnf.MountDir()); os.IsNotExist(err) {
		return os.Mkdir(cnf.MountDir(), os.ModePerm)
	}
	return nil
}

func ReadConfig() (*Config, error) {
	confData, err := os.ReadFile(ConfigFile())
	if err != nil {
		return nil, fmt.Errorf("No config.json found: %w", err)
	}

	conf := &Config{}
	err = json.Unmarshal(confData, conf)
	if err != nil {
		return nil, fmt.Errorf("config.json malformed JSON: %w", err)
	}
	if conf.Repository == "" || conf.Backup == "" {
		err := errors.New("config.json is missing required keys 'Backup' or 'Repository'")
		return nil, err
	}
	if conf.BackupTimeInHours == 0 {
		log.Warn().Msg("backupTimeInHours missing in config, reverting to 24hrs")
		conf.BackupTimeInHours = DefaultBackupTimeInHours
	}

	return conf, nil
}