package helpers

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

	"github.com/juju/errors"

	log "github.com/sirupsen/logrus"
)

// IsGouickDirectory will check if we are in the same directory as the Gouick binary.
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
}

// IsGouickProject will check if a gouick config file exist and readeable.
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
}

// FileExists will check if a file exist and is readeable.
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 will check if a directory path is writable.
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 will create a new directory along with necessessary parents.
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
// return a bool true if directory created, false if not.
func CheckAndCreateDir(path string) (bool, error) {
	dirWritable, err := isDirectoryWritable(path)
	if dirWritable {
		return false, nil
	} else if err != nil && !errors.Is(err, errors.NotFound) {
		log.Warnf("impossible to check if the directory is writable")
		return false, err
	} else if err == nil && !dirWritable {
		log.Warnf("directory is not writable")
		return false, 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 false, err
	}

	return true, nil
}

// RemoveDirectoryContent will delete the content of a provided directory path.
func RemoveDirectoryContent(path string) error {
	dir, err := os.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
}

// GetExecutableDirectory will return the directory of Gouick.
func GetExecutableDirectory() (string, error) {
	e, err := os.Executable()
	if err != nil {
		return "", errors.Trace(err)
	}
	return path.Dir(e), nil
}