package starainrt

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

// Unzip 读取位于src的zip文件，并解压到dst文件夹中
// shell传入当前解压的文件名称
func Unzip(src, dst string, shell func(string)) error {
	dst, err := filepath.Abs(dst)
	if err != nil {
		return err
	}
	if !IsFile(src) {
		return errors.New(src + " Not Exists")
	}
	if Exists(dst) && !IsFolder(dst) {
		return errors.New(dst + " Exists And Not A Folder")
	}
	if !Exists(dst) {
		err := os.MkdirAll(dst, 0755)
		if err != nil {
			return err
		}
	}
	zipreader, err := zip.OpenReader(src)
	if err != nil {
		return err
	}
	defer zipreader.Close()
	for _, v := range zipreader.File {
		name := strings.ReplaceAll(v.Name, "\\", string(os.PathSeparator))
		if v.FileInfo().IsDir() {
			err := os.MkdirAll(dst+string(os.PathSeparator)+name, 0755)
			if err != nil {
				fmt.Println(err)
			}
			continue
		}
		fp, err := v.Open()
		if err != nil {
			fmt.Println(err)
			continue
		}
		go shell(name)
		dir := filepath.Dir(dst + string(os.PathSeparator) + name)
		if !Exists(dir) {
			os.MkdirAll(dir, 0755)
		}
		fpdst, err := os.Create(dst + string(os.PathSeparator) + name)
		if err != nil {
			fmt.Println(err)
			continue
		}
		_, err = io.Copy(fpdst, fp)
		if err != nil {
			fmt.Println(err)
		}
		fp.Close()
		fpdst.Close()
	}
	return nil
}