package zip

import (
	"archive/zip"
	"io"
	"os"
	"path/filepath"
	"strings"
)

// Zip
func Zip(srcFile string, destZip string) error {
	zipFile, err := os.Create(destZip)
	if err != nil {
		return err
	}
	defer zipFile.Close()

	archive := zip.NewWriter(zipFile)
	defer archive.Close()
	srcInfo, err := os.Stat(srcFile)
	if err != nil {
		return err
	}

	return filepath.Walk(srcFile, func(path string, info os.FileInfo, err error) error {
		if err != nil || len(path) == len(srcFile) {
			return err
		}
		header, err := zip.FileInfoHeader(info)
		if err != nil {
			return err
		}
		if srcInfo.IsDir() {
			header.Name = strings.TrimPrefix(path, srcFile+"/")
		} else {
			header.Name = strings.TrimPrefix(path, filepath.Dir(srcFile)+"/")
		}
		if info.IsDir() {
			header.Name += "/"
		} else {
			header.Method = zip.Deflate
		}

		writer, err := archive.CreateHeader(header)
		if err != nil {
			return err
		}

		if !info.IsDir() {
			file, err := os.Open(path)
			if err != nil {
				return err
			}
			defer file.Close()
			_, err = io.Copy(writer, file)
		}
		return err
	})
}

// Unzip
func Unzip(zipFile string, destDir string) error {
	zipReader, err := zip.OpenReader(zipFile)
	if err != nil {
		return err
	}
	defer zipReader.Close()

	for _, f := range zipReader.File {
		fileName := filepath.Join(destDir, f.Name)
		if f.FileInfo().IsDir() {
			_ = os.MkdirAll(fileName, os.ModePerm)
		} else {
			if err = os.MkdirAll(filepath.Dir(fileName), os.ModePerm); err != nil {
				return err
			}

			inFile, err := f.Open()
			if err != nil {
				return err
			}
			defer inFile.Close()

			outFile, err := os.OpenFile(fileName, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, f.Mode())
			if err != nil {
				return err
			}
			defer outFile.Close()

			_, err = io.Copy(outFile, inFile)
			if err != nil {
				return err
			}
		}
	}
	return nil
}