/*
 * Project: Go CLI Tool
 * Category: Go Projects
 * Description: Command-line interface tool built with Go. Features file operations, text processing, command parsing, and system utilities.
 * Author: RSK World
 * Email: support@rskworld.in
 * Website: https://rskworld.in/contact.php
 * Year: 2026
 * Copyright (c) 2026 RSK World. All rights reserved.
 */

package archive

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

// ZipFile creates a zip archive of the specified file or directory.
func ZipFile(source, target string) error {
	zipfile, err := os.Create(target)
	if err != nil {
		return fmt.Errorf("failed to create zip file: %v", err)
	}
	defer zipfile.Close()

	archive := zip.NewWriter(zipfile)
	defer archive.Close()

	info, err := os.Stat(source)
	if err != nil {
		return fmt.Errorf("failed to stat source: %v", err)
	}

	var baseDir string
	if info.IsDir() {
		baseDir = filepath.Base(source)
	}

	filepath.WalkDir(source, func(path string, d os.DirEntry, err error) error {
		if err != nil {
			return err
		}

		info, err := d.Info()
		if err != nil {
			return err
		}

		header, err := zip.FileInfoHeader(info)
		if err != nil {
			return err
		}

		if baseDir != "" {
			header.Name = filepath.Join(baseDir, strings.TrimPrefix(path, source))
		}

		if d.IsDir() {
			header.Name += "/"
		} else {
			header.Method = zip.Deflate
		}

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

		if d.IsDir() {
			return nil
		}

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

	fmt.Printf("Successfully zipped %s to %s\n", source, target)
	return nil
}

// UnzipFile extracts a zip archive to the target directory.
func UnzipFile(source, target string) error {
	r, err := zip.OpenReader(source)
	if err != nil {
		return fmt.Errorf("failed to open zip file: %v", err)
	}
	defer r.Close()

	for _, f := range r.File {
		fpath := filepath.Join(target, f.Name)

		if !strings.HasPrefix(fpath, filepath.Clean(target)+string(os.PathSeparator)) {
			return fmt.Errorf("illegal file path: %s", fpath)
		}

		if f.FileInfo().IsDir() {
			os.MkdirAll(fpath, os.ModePerm)
			continue
		}

		if err = os.MkdirAll(filepath.Dir(fpath), os.ModePerm); err != nil {
			return err
		}

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

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

		_, err = io.Copy(outFile, rc)

		outFile.Close()
		rc.Close()

		if err != nil {
			return err
		}
	}
	fmt.Printf("Successfully unzipped %s to %s\n", source, target)
	return nil
}