package core

import (
	"archive/zip"
	"fmt"
	"io"
	"os"
	"os/exec"
	"os/user"
	"path/filepath"
	"sort"
	"strings"
)

const (
	defaultTrimSet = "\r\n\t "
)

func Trim(s string) string {
	return strings.Trim(s, defaultTrimSet)
}

func TrimRight(s string) string {
	return strings.TrimRight(s, defaultTrimSet)
}

func UniqueInts(a []int, sorted bool) []int {
	tmp := make(map[int]bool)
	uniq := make([]int, 0)

	for _, n := range a {
		tmp[n] = true
	}

	for n := range tmp {
		uniq = append(uniq, n)
	}

	if sorted {
		sort.Ints(uniq)
	}

	return uniq
}

func SepSplit(sv string, sep string) []string {
	filtered := make([]string, 0)
	for _, part := range strings.Split(sv, sep) {
		part = Trim(part)
		if part != "" {
			filtered = append(filtered, part)
		}
	}
	return filtered

}

func CommaSplit(csv string) []string {
	return SepSplit(csv, ",")
}

func ExecSilent(executable string, args []string) (string, error) {
	path, err := exec.LookPath(executable)
	if err != nil {
		return "", err
	}

	raw, err := exec.Command(path, args...).CombinedOutput()
	if err != nil {
		return "", err
	} else {
		return Trim(string(raw)), nil
	}
}

func Exec(executable string, args []string) (string, error) {
	out, err := ExecSilent(executable, args)
	if err != nil {
		fmt.Printf("ERROR for '%s %s': %s\n", executable, args, err)
	}
	return out, err
}

func Exists(path string) bool {
	if _, err := os.Stat(path); os.IsNotExist(err) {
		return false
	}
	return true
}

func ExpandPath(path string) (string, error) {
	// Check if path is empty
	if path != "" {
		if strings.HasPrefix(path, "~") {
			usr, err := user.Current()
			if err != nil {
				return "", err
			} else {
				// Replace only the first occurrence of ~
				path = strings.Replace(path, "~", usr.HomeDir, 1)
			}
		}
		return filepath.Abs(path)
	}
	return "", nil
}

// Unzip will decompress a zip archive, moving all files and folders
// within the zip file (parameter 1) to an output directory (parameter 2).
// Credits to https://golangcode.com/unzip-files-in-go/
func Unzip(src string, dest string) ([]string, error) {
	var filenames []string

	r, err := zip.OpenReader(src)
	if err != nil {
		return filenames, err
	}
	defer r.Close()

	for _, f := range r.File {
		rc, err := f.Open()
		if err != nil {
			return filenames, err
		}
		defer rc.Close()

		// Store filename/path for returning and using later on
		fpath := filepath.Join(dest, f.Name)

		// Check for ZipSlip. More Info: https://snyk.io/research/zip-slip-vulnerability#go
		if !strings.HasPrefix(fpath, filepath.Clean(dest)+string(os.PathSeparator)) {
			return filenames, fmt.Errorf("%s: illegal file path", fpath)
		}

		filenames = append(filenames, fpath)
		if f.FileInfo().IsDir() {
			os.MkdirAll(fpath, os.ModePerm)
		} else if err = os.MkdirAll(filepath.Dir(fpath), os.ModePerm); err != nil {
			return filenames, err
		} else if outFile, err := os.OpenFile(fpath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, f.Mode()); err != nil {
			return filenames, err
		} else {
			defer outFile.Close()
			if _, err = io.Copy(outFile, rc); err != nil {
				return filenames, err
			}
		}
	}

	return filenames, nil
}