package hubtest

import (
	"fmt"
	"os"
	"path/filepath"
	"sort"
)

func sortedMapKeys[V any](m map[string]V) []string {
	keys := make([]string, 0, len(m))
	for k := range m {
		keys = append(keys, k)
	}
	sort.Strings(keys)
	return keys
}

func Copy(src string, dst string) error {
	content, err := os.ReadFile(src)
	if err != nil {
		return err
	}

	err = os.WriteFile(dst, content, 0644)
	if err != nil {
		return err
	}

	return nil
}

// checkPathNotContained returns an error if 'subpath' is inside 'path'
func checkPathNotContained(path string, subpath string) error {
	absPath, err := filepath.Abs(path)
	if err != nil {
		return err
	}

	absSubPath, err := filepath.Abs(subpath)
	if err != nil {
		return err
	}

	current := absSubPath
	for {
		if current == absPath {
			return fmt.Errorf("cannot copy a folder onto itself")
		}
		up := filepath.Dir(current)
		if current == up {
			break
		}
		current = up
	}
	return nil
}

func CopyDir(src string, dest string) error {
	err := checkPathNotContained(src, dest)
	if err != nil {
		return err
	}

	f, err := os.Open(src)
	if err != nil {
		return err
	}

	file, err := f.Stat()
	if err != nil {
		return err
	}

	if !file.IsDir() {
		return fmt.Errorf("Source " + file.Name() + " is not a directory!")
	}

	err = os.MkdirAll(dest, 0755)
	if err != nil {
		return err
	}

	files, err := os.ReadDir(src)
	if err != nil {
		return err
	}

	for _, f := range files {
		if f.IsDir() {
			if err = CopyDir(filepath.Join(src, f.Name()), filepath.Join(dest, f.Name())); err != nil {
				return err
			}
		} else {
			if err = Copy(filepath.Join(src, f.Name()), filepath.Join(dest, f.Name())); err != nil {
				return err
			}
		}
	}

	return nil
}