using System;
using System.Collections.Concurrent;
using System.IO;
using BurnOutSharp.Interfaces;
using BurnOutSharp.Wrappers;
using static BurnOutSharp.Utilities.Dictionary;

namespace BurnOutSharp.FileType
{
    /// <summary>
    /// Microsoft cabinet file
    /// </summary>
    /// <remarks>Specification available at <see href="http://download.microsoft.com/download/5/0/1/501ED102-E53F-4CE0-AA6B-B0F93629DDC6/Exchange/%5BMS-CAB%5D.pdf"/></remarks>
    /// <see href="https://github.com/wine-mirror/wine/tree/master/dlls/cabinet"/>
    public class MicrosoftCAB : IScannable
    {
        /// <inheritdoc/>
        public ConcurrentDictionary<string, ConcurrentQueue<string>> Scan(Scanner scanner, string file)
        {
            if (!File.Exists(file))
                return null;

            using (var fs = File.Open(file, FileMode.Open, FileAccess.Read, FileShare.Read))
            {
                return Scan(scanner, fs, file);
            }
        }

        /// <inheritdoc/>
        public ConcurrentDictionary<string, ConcurrentQueue<string>> Scan(Scanner scanner, Stream stream, string file)
        {
            // If the cab file itself fails
            try
            {
                string tempPath = Path.Combine(Path.GetTempPath(), Guid.NewGuid().ToString());
                Directory.CreateDirectory(tempPath);

                // Open the cab file
                var cabFile = MicrosoftCabinet.Create(stream);
                if (cabFile == null)
                {
                    if (scanner.IncludeDebug) Console.WriteLine($"Error occurred while opening");
                    return null;
                }

                // If entry extraction fails
                try
                {
                    bool success = cabFile.ExtractAll(tempPath);
                    if (!success)
                    {
                        if (scanner.IncludeDebug) Console.WriteLine($"Error occurred during extraction of files");
                    }
                }
                catch (Exception ex)
                {
                    if (scanner.IncludeDebug) Console.WriteLine(ex);
                }

                // Collect and format all found protections
                var protections = scanner.GetProtections(tempPath);

                // If temp directory cleanup fails
                try
                {
                    Directory.Delete(tempPath, true);
                }
                catch (Exception ex)
                {
                    if (scanner.IncludeDebug) Console.WriteLine(ex);
                }

                // Remove temporary path references
                StripFromKeys(protections, tempPath);

                return protections;
            }
            catch (Exception ex)
            {
                if (scanner.IncludeDebug) Console.WriteLine(ex);
            }

            return null;
        }
    }
}
