package config

import (
	"os"
	"path/filepath"
	"runtime"
)

// DefaultPath returns the default location for the YAML config file. On
// Windows we follow the same convention as the legacy WinAuth and use
// %APPDATA%\winauth-go\config.yaml. On other platforms we honor
// $XDG_CONFIG_HOME (falling back to ~/.config) and use the standard
// winauth-go subdirectory.
func DefaultPath() string {
	if p := envConfigPath(); p != "" {
		return p
	}
	if runtime.GOOS == "windows" {
		if dir := os.Getenv("APPDATA"); dir != "" {
			return filepath.Join(dir, "winauth-go", "config.yaml")
		}
	}
	if dir := os.Getenv("XDG_CONFIG_HOME"); dir != "" {
		return filepath.Join(dir, "winauth-go", "config.yaml")
	}
	if home, err := os.UserHomeDir(); err == nil {
		return filepath.Join(home, ".config", "winauth-go", "config.yaml")
	}
	return "winauth.yaml"
}

func envConfigPath() string {
	return os.Getenv("WINAUTH_GO_CONFIG")
}

// EnsureDir creates the parent directory of path with 0o700 permissions
// (best effort). Returns nil if creation succeeds or the directory already
// exists.
func EnsureDir(path string) error {
	return os.MkdirAll(filepath.Dir(path), 0o700)
}