// data directory
package datadir

import (
  "errors"
  "io/fs"
  "os"
  "path/filepath"
)

// Get data directory path.
func DataDir() (string, error) {
  var dir string

  // check environment
  if val, ok := os.LookupEnv("CVEZ_DATA_DIR"); ok {
    return val, nil
  }

  // get config dir
  configDir, err := os.UserConfigDir()
  if err != nil {
    return dir, err
  }

  // build path to data directory in config dir
  dir = filepath.Join(configDir, "cvez")
  if _, err = os.Stat(dir); err != nil {
    if errors.Is(err, fs.ErrNotExist) {
      // create data directory
      return dir, os.MkdirAll(dir, 0700)
    } else {
      // return error
      return "", err
    }
  } else {
    return dir, nil
  }
}

// Build path to file in cvez data directory.
func Join(args ...string) (string, error) {
  if dir, err := DataDir(); err != nil {
    return "", err
  } else {
    return filepath.Join(dir, filepath.Join(args...)), nil
  }
}

// Get path to cache directory path within data directory and create it
// if it does not exist.
func CacheDir() (string, error) {
  // build path, check for error
  dir, err := Join("cache")
  if err != nil {
    return "", err
  }

  // create and return cache directory
  return dir, os.MkdirAll(dir, 0700)
}