package tools

import (
	"errors"
	"fmt"
	"io/fs"
	"os"
	"path"
	"path/filepath"
	"strconv"
)

// exported function(s)
func ScanDirectory(source string, extensions ...string) ([]string, error) {
	var files []string
	if IsEmpty(source) {
		return files, errors.New("no source directory specified")
	}
	stats, error := os.Stat(source)
	if error != nil || !stats.IsDir() {
		return files, error
	}
	results, error := os.ReadDir(source)
	if error != nil {
		return files, error
	}
	for _, file := range results {
		fileName := file.Name()
		filePath := filepath.Join(source, fileName)
		if file.IsDir() {
			subFiles, error := ScanDirectory(filePath, extensions...)
			for _, subFile := range subFiles {
				files = append(files, subFile)
			}
			if error != nil {
				return files, error
			}
			continue
		}
		if ContainsString(extensions, filepath.Ext("."+fileName)) {
			files = append(files, filePath)
			continue
		}

	}
	return files, nil
}

func MkDirs(destination string) error {
	if IsEmpty(destination) {
		return nil
	}
	destination = filepath.Clean(destination)
	stats, error := os.Stat(destination)
	if error != nil && !errors.Is(error, os.ErrNotExist) {
		return error
	}
	if stats != nil && stats.IsDir() {
		return nil
	}
	return os.MkdirAll(destination, os.ModePerm)
}

func GetSubDirectories(directory string) []string {
	var folders []string
	filepath.WalkDir(directory, func(path string, info fs.DirEntry, err error) error {
		if err != nil {
			return err
		}
		if !info.IsDir() {
			return nil
		}
		folders = append(folders, path)
		return nil
	})
	return folders
}

func CopyFile(source string, destination string) error {
	if IsEmpty(source) || IsEmpty(destination) {
		return nil
	}
	stats, error := os.Stat(source)
	if error != nil {
		return error
	}
	source = filepath.Clean(source)
	destination = filepath.Clean(destination)
	error = MkDirs(filepath.Dir(destination))
	if error != nil {
		return error
	}
	bytes, error := os.ReadFile(source)
	if error != nil {
		return error
	}
	return os.WriteFile(destination, bytes, stats.Mode())
}

func MoveFile(source string, destination string) error {
	if IsEmpty(source) || IsEmpty(destination) {
		return nil
	}
	source = filepath.Clean(source)
	destination = filepath.Clean(destination)
	error := MkDirs(filepath.Dir(destination))
	if error != nil {
		return error
	}
	error = os.Rename(source, destination)
	if error == nil {
		return nil
	}
	error = CopyFile(source, destination)
	if error != nil {
		return error
	}
	return os.Remove(source)
}

func CreateFile(file string) error {
	if Exists(file) {
		return nil
	}
	error := MkDirs(path.Dir(file))
	if error != nil {
		return error
	}
	_, error = os.Create(file)
	if error != nil {
		return error
	}
	return nil
}

func Delete(source string) error {
	return os.Remove(source)
}

func DeleteForced(source string) error {
	return os.RemoveAll((source))
}

func DeleteEmpty(source string) []error {
	var errors []error
	directories := GetSubDirectories(source)
	for index := len(directories) - 1; index > 0; index-- {
		directory := directories[index]
		error := Delete(directory)
		if error != nil {
			errors = append(errors, error)
		}
	}
	if len(errors) > 0 {
		return errors
	}
	return nil
}

func Exists(path string) bool {
	_, error := os.Stat(path)
	return error == nil
}

// unexported function(s)
func getSubDirectories(directory string, folders *[]string) []string {
	if IsEmpty(directory) {
		return *folders
	}
	directory = filepath.Clean(directory)
	stats, error := os.Stat(directory)
	if error != nil {
		return *folders
	}
	test := stats.IsDir()
	fmt.Println(strconv.FormatBool(test))
	if !stats.IsDir() {
		return *folders
	}
	files, error := os.ReadDir(directory)
	if error != nil {
		return *folders
	}
	for _, tmp := range files {
		if !tmp.IsDir() {
			continue
		}
		if tmp.IsDir() {
			path := directory + string(os.PathSeparator) + tmp.Name()
			*folders = append(*folders, path)
			getSubDirectories(path, folders)
		}
	}
	return *folders
}