package files

import (
	"fmt"
	"io/fs"
	"os"
	"path/filepath"

	"git.tswf.io/incredible-go/incredible-go-core/pkg/collections/array_list"
)

type FileFilter func(fileInfo os.FileInfo, fileName string) bool

func ListFiles(dirPath string) (*array_list.ArrayList[string], error) {
	dirInfo, err := os.Stat(dirPath)

	if err != nil {
		return nil, err
	}

	if !dirInfo.IsDir() {
		return nil, fmt.Errorf("'%s' is not directory", dirPath)
	}

	dirEntries, err := os.ReadDir(dirPath)

	if err != nil {
		return nil, err
	}

	result := array_list.NewArrayList[string]()

	if len(dirEntries) > 0 {
		for _, dirEntry := range dirEntries {
			result.Add(dirEntry.Name())
		}
	}

	return result, nil
}

func FindSubFilesByFilter(rootPath string, filter FileFilter) (*array_list.ArrayList[string], error) {
	result := array_list.NewArrayList[string]()

	err := filepath.Walk(rootPath, func(path string, info fs.FileInfo, err error) error {
		if err == nil && filter(info, path) {
			result.Add(path)
		}

		return err
	})

	if err != nil {
		return nil, err
	}

	return result, nil
}