package osutils

import (
	"crypto/sha1"
	"encoding/hex"
	"io"
	"io/fs"
	"io/ioutil"
	"log"
	"os"
	"path"
	"path/filepath"
	"strings"
)

func IsDirectory(path string) (bool, error) {
	fileInfo, err := os.Stat(path)
	if err != nil {
		return false, err
	}

	return fileInfo.IsDir(), err
}

func RecursiceWalk(pathToWalk string) ([]string, error) {
	paths := []string{}
	err := filepath.Walk(pathToWalk,
		func(path string, info os.FileInfo, err error) error {
			if err != nil {
				println(err)
				return err
			}
			// fmt.Println(path[len(path)-4:])
			libBool, err := IsDirectory(path)
			if err != nil {
				println("error in checking lib or dir")
			}
			if !libBool {
				// println(path)
				paths = append(paths, path)
			}
			return nil
		})
	if err != nil {
		log.Println(err)
	}
	return paths, nil
}

func ListDir(path string) ([]fs.FileInfo, error) {
	files, err := ioutil.ReadDir(path)
	if err != nil {
		return []fs.FileInfo{}, err
	}
	return files, nil
}

func GetParentDir(filePath string) (string, error) {
	cuttedPath := strings.Split(filePath, "/")
	cuttedPath = cuttedPath[:len(cuttedPath)-1]
	finalPath := path.Join("/", path.Join(cuttedPath...))
	return finalPath, nil
}

type FileValidationInfo struct {
	Path string
	fs.FileInfo
	SHA1 string
}

func ValidateFile(filePath string) (*FileValidationInfo, error) {
	info := FileValidationInfo{
		Path:     filePath,
		FileInfo: nil,
		SHA1:     "",
	}
	info.Path = filePath

	stat, err := os.Stat(filePath)
	if err != nil {
		return &info, err
	}
	info.FileInfo = stat

	hash, err := GetFileHash(filePath)
	if err != nil {
		return &info, err
	}
	info.SHA1 = hash

	return &info, nil
}

func GetFileHash(filePath string) (string, error) {
	//Initialize variable returnMD5String now in case an error has to be returned
	var returnSHA1String string

	//Open the filepath passed by the argument and check for any error
	file, err := os.Open(filePath)
	if err != nil {
		return "", err
	}

	//Tell the program to call the following function when the current function returns
	defer file.Close()

	//Open a new SHA1 hash interface to write to
	hash := sha1.New()

	//Copy the file in the hash interface and check for any error
	if _, err := io.Copy(hash, file); err != nil {
		return returnSHA1String, err
	}

	//Get the 20 bytes hash
	hashInBytes := hash.Sum(nil)[:20]

	//Convert the bytes to a string
	returnSHA1String = hex.EncodeToString(hashInBytes)

	return returnSHA1String, nil
}