package config

import (
	"os"
	"path/filepath"
)

const (
	appDirName  = "vault-tui"
	fileName    = "config.yaml"
	configEnv   = "VAULT_TUI_CONFIG"
	profileEnv  = "VAULT_TUI_PROFILE"
	noEnvEnv    = "VAULT_TUI_NO_ENV"
	readOnlyEnv = "VAULT_TUI_READ_ONLY"
)

// DefaultPath returns the config file location used when neither --config
// nor VAULT_TUI_CONFIG is set: $XDG_CONFIG_HOME/vault-tui/config.yaml,
// falling back to ~/.config/vault-tui/config.yaml.
func DefaultPath() (string, error) {
	dir, err := os.UserConfigDir()
	if err != nil {
		return "", err
	}
	return filepath.Join(dir, appDirName, fileName), nil
}

// ResolvePath applies the discovery order: --config flag > VAULT_TUI_CONFIG
// env > default XDG location.
func ResolvePath(flag string) (string, error) {
	if flag != "" {
		return flag, nil
	}
	if v := os.Getenv(configEnv); v != "" {
		return v, nil
	}
	return DefaultPath()
}

// StateDir returns the directory vault-tui uses for its own per-profile
// token cache (internal/token/store_profile.go): $XDG_STATE_HOME/vault-tui,
// falling back to ~/.local/state/vault-tui.
func StateDir() (string, error) {
	if v := os.Getenv("XDG_STATE_HOME"); v != "" {
		return filepath.Join(v, appDirName), nil
	}
	home, err := os.UserHomeDir()
	if err != nil {
		return "", err
	}
	return filepath.Join(home, ".local", "state", appDirName), nil
}