package store

import (
	"encoding/json"
	"math/rand"
	"os"
	"path/filepath"
	"sync"

	"git.tukangketik.id/swanadiva/hostkeeper/pkg/crypto"
)

var dataDir string
var mu sync.RWMutex

func init() {
	configDir, err := os.UserConfigDir()
	if err != nil {
		configDir = os.TempDir()
	}
	dataDir = filepath.Join(configDir, "hostkeeper", "v2")
	os.MkdirAll(dataDir, 0755)
}

func readFile(name string, v any) error {
	path := filepath.Join(dataDir, name)
	data, err := os.ReadFile(path)
	if err != nil {
		if os.IsNotExist(err) {
			return nil
		}
		return err
	}
	if len(data) == 0 {
		return nil
	}
	if crypto.IsEncrypted(string(data)) {
		return nil
	}
	return json.Unmarshal(data, v)
}

func writeFile(name string, v any) error {
	path := filepath.Join(dataDir, name)
	data, err := json.MarshalIndent(v, "", "  ")
	if err != nil {
		return err
	}
	return os.WriteFile(path, data, 0644)
}

func randID() string {
	const letters = "abcdefghijklmnopqrstuvwxyz0123456789"
	b := make([]byte, 8)
	for i := range b {
		b[i] = letters[rand.Intn(len(letters))]
	}
	return string(b)
}