package utils

import (
	"fmt"
	"io"
	"log"
	"os"
	"path/filepath"
	"strings"

	"archive/zip"
)

func CompressByFiles(fileNames []string, dest string) error {
	d, _ := os.Create(dest)
	defer d.Close()
	w := zip.NewWriter(d)
	defer w.Close()
	for _, fileName := range fileNames {
		file, err := os.Open(fileName)
		//defer file.Close()
		if err != nil {
			log.Println(err)
			return err
		}
		err = compress(file, "", w)
		if err != nil {
			log.Println(err)
			return err
		}
	}
	return nil
}

func compress(file *os.File, prefix string, zw *zip.Writer) error {
	info, err := file.Stat()
	if err != nil {
		log.Println(err)
		return err
	}
	header, err := zip.FileInfoHeader(info)
	header.Name = prefix + "/" + header.Name
	if err != nil {
		log.Println(err)
		return err
	}
	writer, err := zw.CreateHeader(header)
	if err != nil {
		log.Println(err)
		return err
	}
	_, err = io.Copy(writer, file)
	file.Close()
	if err != nil {
		log.Println(err)
		return err
	}
	return nil
}

func ZipDirectory(dirPath string, zipFilePath string) error {
	// 创建目标zip文件
	zipFile, err := os.Create(zipFilePath)
	if err != nil {
		return err
	}
	defer zipFile.Close()

	// 创建zip.Writer写入目标文件
	zipWriter := zip.NewWriter(zipFile)
	defer zipWriter.Close()

	// 递归遍历目录，将文件和子目录添加到zip.Writer中
	err = filepath.Walk(dirPath, func(filePath string, info os.FileInfo, err error) error {
		if err != nil {
			return err
		}

		// 创建zip文件中的路径
		relPath := strings.TrimPrefix(filePath, dirPath)
		zipPath := filepath.Join(filepath.Base(dirPath), relPath)

		// 如果是目录，则只创建目录而不添加文件
		if info.IsDir() {
			_, err = zipWriter.Create(zipPath + "/")
			if err != nil {
				return err
			}
		} else {
			// 如果是文件，则创建文件并将内容写入zip.Writer中
			file, err := os.Open(filePath)
			if err != nil {
				return err
			}
			defer file.Close()

			zipFile, err := zipWriter.Create(zipPath)
			if err != nil {
				return err
			}

			_, err = io.Copy(zipFile, file)
			if err != nil {
				return err
			}
		}

		return nil
	})

	if err != nil {
		return err
	}

	fmt.Printf("目录 %s 已打包成文件 %s\n", dirPath, zipFilePath)
	return nil
}