using System;
using System.Diagnostics;
using System.IO;
using System.IO.Compression;
using System.Linq;

namespace Updater
{
    public class Unzip
    {
        /// <summary>
        /// 忽略的文件列表
        /// </summary>
        static readonly string[] IgnoreFiles = { };
        public static bool ExtractZipFile(string zipPath, string extractPath)
        {
            try
            {
                if (!extractPath.EndsWith(Path.DirectorySeparatorChar.ToString(), StringComparison.Ordinal))
                    extractPath += Path.DirectorySeparatorChar;

                using (ZipArchive archive = ZipFile.OpenRead(zipPath))
                {
                    foreach (ZipArchiveEntry entry in archive.Entries)
                    {

                        if (!IsIgnoreFile(entry.FullName))
                        {
                            // Gets the full path to ensure that relative segments are removed.
                            string destinationPath = Path.GetFullPath(Path.Combine(extractPath, entry.FullName));
                            if (!IsDir(destinationPath))
                            {
                                //  判断路径是否存在
                                string dir = Path.GetDirectoryName(destinationPath);
                                if (!Directory.Exists(dir))
                                {
                                    Directory.CreateDirectory(dir);
                                }

                                if (File.Exists(destinationPath))
                                {
                                    File.Delete(destinationPath);
                                }
                                // Ordinal match is safest, case-sensitive volumes can be mounted within volumes that
                                // are case-insensitive.
                                Debug.WriteLine($"抽取：{destinationPath}");
                                if (destinationPath.StartsWith(extractPath, StringComparison.Ordinal))
                                    entry.ExtractToFile(destinationPath);
                            }
                            else
                            {
                                //创建目录
                                Directory.CreateDirectory(destinationPath);
                            }
                        }
                    }
                    return true;
                }
            }
            catch
            {
                return false;
            }
        }

        /// <summary>
        /// 指示文件是否是忽略的
        /// </summary>
        /// <param name="fileName"></param>
        /// <returns></returns>
        static bool IsIgnoreFile(string fileName)
        {
            return (Array.IndexOf(IgnoreFiles, fileName) != -1);
        }
        /// <summary>
        /// 指示路径是否是目录
        /// </summary>
        /// <param name="path"></param>
        /// <returns></returns>
        static bool IsDir(string path)
        {
            return path.Last() == '\\';
        }
    }
}