using System;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Windows;
using TrustedUninstaller.Shared;

namespace TrustedUninstaller.CLI
{
    public class CLI
    {
        private static async System.Threading.Tasks.Task<int> Main(string[] args)
        {
            //Needed after defender removal's reboot, the "current directory" will be set to System32
            //After the auto start up.
            Directory.SetCurrentDirectory(AppDomain.CurrentDomain.BaseDirectory);

            DualOut.Init();

            if (!WinUtil.IsAdministrator())
            {
                System.Console.Error.WriteLine("This program must be launched as an Administrator!");
                return -1;
            }
#if !DEBUG
            /*
            if (!WinUtil.IsGenuineWindows())
            {
                System.Console.Error.WriteLine("This program only works on genuine Windows copies!");
                return -1;
            }
            */
#endif

            if (args.Length < 1 || !Directory.Exists(args[0]))
            {
                Console.WriteLine("No Playbook selected: Use the GUI to select a playbook to run.");
                return -1;
            }
            
            AmeliorationUtil.Playbook = await AmeliorationUtil.DeserializePlaybook(args[0]);
            
            
            if (!Directory.Exists($"{AmeliorationUtil.Playbook.Path}\\Configuration"))
            {
                Console.WriteLine("Creating Configuration folder...");
                Directory.CreateDirectory($"{AmeliorationUtil.Playbook.Path}\\Configuration");
            }

            if (Directory.GetFiles($"{AmeliorationUtil.Playbook.Path}\\Configuration").Length == 0)
            {
                Console.WriteLine("Configuration folder is empty, put YAML files in it and restart the application.");
                Console.WriteLine($"Current directory: {Directory.GetCurrentDirectory()}");
                return -1;
            }
            
            ExtractResourceFolder("resources", Directory.GetCurrentDirectory());
            
            await AmeliorationUtil.StartAmelioration();
            
            return 0;
        }
        
        
         public static void ExtractResourceFolder(string resource, string dir, bool overwrite = false)
        {
            if (!Directory.Exists(dir)) Directory.CreateDirectory(dir);

            Assembly assembly = Assembly.GetExecutingAssembly();

            var resources = assembly.GetManifestResourceNames().Where(res => res.StartsWith($"TrustedUninstaller.CLI.Properties"));

            foreach (var obj in resources)
            {
                using (UnmanagedMemoryStream stream = (UnmanagedMemoryStream)assembly.GetManifestResourceStream(obj))
                {
                    int MB = 1024 * 1024;
                    int offset = -MB;

                    var file = dir + $"\\{obj.Substring($"TrustedUninstaller.CLI.Properties.{resource}.".Length).Replace("---", "\\")}";
                    if (file.EndsWith(".gitkeep")) continue;
                    
                    var fileDir = Path.GetDirectoryName(file);
                    if (fileDir != null && !Directory.Exists(fileDir)) Directory.CreateDirectory(fileDir);

                    if (File.Exists(file) && !overwrite) continue;
                    if (File.Exists(file) && overwrite)
                    {
                        try
                        {
                            File.Delete(file);
                        }
                        catch (Exception e)
                        {
                            if (!Directory.Exists(Directory.GetCurrentDirectory() + "\\Logs"))
                                Directory.CreateDirectory(Directory.GetCurrentDirectory() + "\\Logs");
                            using (var writer = new StreamWriter(Path.Combine(Directory.GetCurrentDirectory(), "Logs\\ErrorLog.txt"), true))
                            {
                                writer.WriteLine($"Title: Could not delete existing resource file {file}.\r\nMessage: {e.Message}\r\n\r\nStackTrace: {e.StackTrace}");
                                writer.WriteLine("\r\nDate/Time: " + DateTime.Now);
                                writer.WriteLine("============================================");
                            }
                            continue;
                        }
                    }

                    using (FileStream fsDlst = new FileStream(file, FileMode.CreateNew, FileAccess.Write))
                    {
                        while (offset + MB < stream.Length)
                        {
                            var buffer = new byte[MB];
                            offset += MB;

                            if (offset + MB > stream.Length)
                            {
                                var bytesLeft = stream.Length - offset;
                                buffer = new byte[bytesLeft];
                            }

                            stream.Seek(offset, SeekOrigin.Begin);
                            stream.Read(buffer, 0, buffer.Length);

                            fsDlst.Seek(offset, SeekOrigin.Begin);
                            fsDlst.Write(buffer, 0, buffer.Length);
                        }
                    }
                }
            }
        }
    }
}