package main

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

func findFiles(config Config) ([]string, error) {
	var musicFiles []string

	walkFunc := func(path string, info os.FileInfo, err error) error {
		if err != nil {
			return err
		}

		if info.IsDir() && path != config.SourceDir && !config.Recursion {
			return filepath.SkipDir
		}

		ext := strings.ToLower(filepath.Ext(path))
		if ext == ".mp3" || ext == ".m4a" || ext == ".flac" || ext == ".wav" {
			musicFiles = append(musicFiles, path)
		}

		return nil
	}

	if err := filepath.Walk(config.SourceDir, walkFunc); err != nil {
		return nil, err
	}

	return musicFiles, nil
}