package audio

import (
	"fmt"
	"path/filepath"
	"strings"
)

// AudioFormat represents a supported audio format
type AudioFormat int

const (
	FormatUnknown AudioFormat = iota
	FormatMP3
	FormatWAV
	FormatFLAC
	FormatOGG
)

// DetectFormat returns the audio format based on file extension
func DetectFormat(path string) AudioFormat {
	ext := strings.ToLower(filepath.Ext(path))
	switch ext {
	case ".mp3":
		return FormatMP3
	case ".wav":
		return FormatWAV
	case ".flac":
		return FormatFLAC
	case ".ogg":
		return FormatOGG
	default:
		return FormatUnknown
	}
}

// String returns the format name
func (f AudioFormat) String() string {
	switch f {
	case FormatMP3:
		return "MP3"
	case FormatWAV:
		return "WAV"
	case FormatFLAC:
		return "FLAC"
	case FormatOGG:
		return "OGG"
	default:
		return "Unknown"
	}
}

// ValidateFormat checks if the file format is supported
func ValidateFormat(path string) error {
	format := DetectFormat(path)
	if format == FormatUnknown {
		return fmt.Errorf("unsupported audio format: %s", filepath.Ext(path))
	}
	return nil
}