using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using System.IO.Compression;
using System.IO;

namespace ConsoleApp01
{
    class Program
    {
        static void Main(string[] args)
        {
            string targetZip = AppDomain.CurrentDomain.BaseDirectory + "\" + System.Guid.NewGuid().ToString() + ".zip";

            string sourceFolder = AppDomain.CurrentDomain.BaseDirectory + "\Sample01" ; //We are going to zip the whole contents of the folder. 

            Console.WriteLine(String.Format("Now Archiving the folder/file {0}, to target zip:{1} ", sourceFolder, targetZip));

            //Zipping the folder 
            ZipFiles(sourceFolder, targetZip);



            string extractFolder = AppDomain.CurrentDomain.BaseDirectory + "\" + Path.GetFileNameWithoutExtension(targetZip);

            Console.WriteLine(String.Format("Now Extracting the file {0}, to location:{1} ", targetZip, extractFolder));

            //Extract the entire Zip file 
            ExtractFiles(targetZip, extractFolder);



            //Extract files based on search pattern such as *.txt
            string extractFolder2 = AppDomain.CurrentDomain.BaseDirectory + "\" + Path.GetFileNameWithoutExtension(targetZip) + "12";

            Console.WriteLine(String.Format("Now Extracting the selected file(s) {0}, to location:{1} ", targetZip, extractFolder2));
            
            //Extract the entire Zip file 
            ExtractFiles(targetZip, extractFolder2, "*.txt");

            Console.WriteLine("Press any key to exit");

            Console.ReadKey();
        }

        /// <summary>
        /// Zips the files from the source folder - for now single level - assuming that we will be zipping all the files in a folder. 
        /// not the child folders and files in it, we will ignore it.
        /// </summary>
        /// <param name="sourceFilesFolderPath">The source files folder path.</param>
        /// <param name="targetZipFilePath">The target zip file path.</param>
        /// <param name="searchPattern">The search pattern.</param>
        public static void ZipFiles(string sourceFilesFolderPath, string targetZipFilePath, string searchPattern = "")
        {
            //if Source Directory exists. 
            if (Directory.Exists(sourceFilesFolderPath))
            {
                using (FileStream zipToOpen = new FileStream(targetZipFilePath, FileMode.OpenOrCreate))
                {
                    //Open Archieve for update
                    using (ZipArchive archive = new ZipArchive(zipToOpen, ZipArchiveMode.Update))
                    {
                        //Getting directory info
                        DirectoryInfo dInfo = new DirectoryInfo(sourceFilesFolderPath);


                        //Getting all files list in the folder 
                        FileInfo[] filesList = dInfo.GetFiles(searchPattern);

                        if (String.IsNullOrEmpty(searchPattern)) //fail safe to retrieve all
                            filesList = dInfo.GetFiles();

                        if (filesList != null && filesList.Length > 0)
                        {
                            //Creating archieve entry for each file in the folder 
                            foreach (FileInfo file in filesList)
                            {
                                archive.CreateEntryFromFile(file.FullName, file.Name);
                            }
                        }


                    }

                }
            }
            else
            {
                throw new DirectoryNotFoundException(String.Format("Source folder: {0} not found",sourceFilesFolderPath);
            }

        }




        /// <summary>
        /// Extracts the files.
        /// </summary>
        /// <param name="sourceZipPath">The source zip path.</param>
        /// <param name="targetExtractPath">The target extract path.</param>
        /// <param name="conditionalExtractPattern">The conditional extract pattern.(OPTIONAL)</param>
        public static void ExtractFiles(string sourceZipPath, string targetExtractPath, string conditionalExtractPattern = "")
        {
            string zipPath      = sourceZipPath;  //Source Zip File 
            string extractPath  = targetExtractPath; //Path to Extract

            if (!Directory.Exists(targetExtractPath))
            {
                Directory.CreateDirectory(targetExtractPath);
            }

            using (ZipArchive archive = ZipFile.OpenRead(zipPath))
            {

                //STEP 1
                foreach (ZipArchiveEntry entry in archive.Entries)
                {
                    //Conditional extract
                    if (!String.IsNullOrEmpty(conditionalExtractPattern))
                    {
                        if (entry.FullName.EndsWith(".txt", StringComparison.OrdinalIgnoreCase))
                        {
                            entry.ExtractToFile(Path.Combine(extractPath, entry.FullName),true);
                        }
                    }
                    else // extract all..
                    {
                        entry.ExtractToFile(Path.Combine(extractPath, entry.FullName),true);
                    }

                    
                }

                //Or EXTRACT ALL USING 

                //STEP 2
                //archive.ExtractToDirectory(targetExtractPath);

            } 

        }




        /// <summary>
        /// Extracts the file.
        /// </summary>
        /// <param name="sourceZipPath">The source zip path.</param>
        /// <param name="targetExtractPath">The target extract path.</param>
        /// <param name="extractFileName">Name of the extract file.</param>
        public static void ExtractFile(string sourceZipPath, string targetExtractPath, string extractFileName)
        {
            string zipPath = sourceZipPath;  //Source Zip File 
            string extractPath = targetExtractPath; //Path to Extract

            using (ZipArchive archive = ZipFile.OpenRead(zipPath))
            {
                //STEP 1
                foreach (ZipArchiveEntry entry in archive.Entries)
                {
                    //Conditional extract
                    if (!String.IsNullOrEmpty(extractFileName))
                    {
                        //Extract the file.
                        if (entry.FullName.EndsWith(extractFileName, StringComparison.OrdinalIgnoreCase))
                        {
                            entry.ExtractToFile(Path.Combine(extractPath, entry.FullName), true);
                        }
                    }

                }

            }

        }

    
    }
}