package helpers

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

	"github.com/juju/errors"

	log "github.com/sirupsen/logrus"
)

func IsGouickDirectory(path string) (bool, error) {

	binPath, err := os.Executable()
	if err != nil {
		return false, errors.Trace(err)
	}

	gouickPath := filepath.Dir(binPath)

	if gouickPath != path {
		return false, nil
	}

	return true, nil
}

func IsGouickProject(path string) (bool, error) {

	exist, err := fileExists(filepath.Join(path, configFile))
	if err != nil {
		return false, errors.Trace(err)
	}

	if !exist {
		return false, nil
	}

	return true, nil
}

func IsGoProject(path string) (bool, error) {

	exist, err := fileExists(filepath.Join(path, "go.mod"))
	if err != nil {
		return false, errors.Trace(err)
	}

	if exist {
		return true, nil
	}

	exist, err = fileExists(filepath.Join(path, "go.sum"))
	if err != nil {
		return false, errors.Trace(err)
	}

	if exist {
		return true, nil
	}

	return false, nil
}

func fileExists(path string) (bool, error) {

	fileInfo, err := os.Stat(path)
	if err != nil {

		if errors.Is(err, fs.ErrPermission) {
			return false, errors.NewForbidden(err, "file is not readeable")
		} else if errors.Is(err, fs.ErrNotExist) {
			return false, nil
		} else {
			return false, errors.Trace(err)
		}
	}
	if fileInfo.IsDir() {
		return false, errors.NotValidf("%s is actually a directory", path)
	}

	return true, nil
}

// isDirectoryWritable
func isDirectoryWritable(path string) (bool, error) {

	dirInfo, err := os.Stat(path)
	if err != nil {

		if errors.Is(err, fs.ErrPermission) {
			return false, errors.NewForbidden(err, "directory is not readeable")
		} else if errors.Is(err, fs.ErrNotExist) {
			return false, errors.NewNotFound(err, "directory does not exit")
		} else {
			return false, errors.Trace(err)
		}
	}

	if !dirInfo.IsDir() {
		return false, errors.NotSupportedf("given path is not a directory")
	}

	if dirInfo.Mode().Perm()&(1<<(uint(7))) == 0 {
		return false, nil
	}

	return true, nil
}

// createDirectory
func createDirectory(path string) error {

	// no need to check if path exist
	// MkdirAll will do it for us
	err := os.MkdirAll(path, os.ModePerm)
	if err != nil {
		return errors.Trace(err)
	}

	return nil
}

// CheckAndCreateDir will check if path is writable and create directory if needed
func CheckAndCreateDir(path string) error {

	dirWritable, err := isDirectoryWritable(path)
	if dirWritable {
		return nil
	} else if err != nil && !errors.Is(err, errors.NotFound) {
		log.Warnf("impossible to check if the directory is writable")
		return err
	} else if err == nil && !dirWritable {
		log.Warnf("directory is not writable")
		return errors.Forbiddenf("directory is not writable")
	}

	err = createDirectory(path)
	if err != nil {

		log.Warnf("impossible to create directory (%s), please try again", err.Error())
		return err
	}

	return nil
}

func RemoveDirectoryContent(path string) error {

	dir, err := ioutil.ReadDir(path)
	if err != nil {
		return errors.Trace(err)
	}

	for _, d := range dir {

		err := os.RemoveAll(
			filepath.Join(path, d.Name()),
		)
		if err != nil {
			return errors.Trace(err)
		}

	}

	return nil
}