// Package mode detects whether the CLI runs in padded-cell mode or manual mode.
package mode

import (
	"os/exec"
	"sync"
)

// RuntimeMode represents the CLI operating mode.
type RuntimeMode int

const (
	// ManualMode requires explicit --token / --acc-mgr-token flags.
	ManualMode RuntimeMode = iota
	// PaddedCellMode resolves secrets via pass_mgr automatically.
	PaddedCellMode
)

var (
	detectedMode RuntimeMode
	detectOnce   sync.Once
)

// Detect checks whether pass_mgr is available and returns the runtime mode.
// The result is cached after the first call.
func Detect() RuntimeMode {
	detectOnce.Do(func() {
		_, err := exec.LookPath("pass_mgr")
		if err == nil {
			detectedMode = PaddedCellMode
		} else {
			detectedMode = ManualMode
		}
	})
	return detectedMode
}

// IsPaddedCell is a convenience helper.
func IsPaddedCell() bool {
	return Detect() == PaddedCellMode
}

// String returns a human-readable mode name.
func (m RuntimeMode) String() string {
	switch m {
	case PaddedCellMode:
		return "padded-cell"
	case ManualMode:
		return "manual"
	default:
		return "unknown"
	}
}