Program.cs

using System;

namespace NewProject
{
    internal class Program
    {
        static void Main(string[] args)
        {
            FileSystem fs = new FileSystem();

            Console.WriteLine("Enter the size of the blocks(preferably 512, 1024 or 2048 bytes): ");
            fs._blockSize = int.Parse(Console.ReadLine() ?? "1024");

            Console.WriteLine("Enter the number of the blocks between 4 and 20: ");
            fs._totalBlocks = int.Parse(Console.ReadLine() ?? "5");

            bool formatOnStart = true;
            fs.InitializeFileSystem(fs.filePath, formatOnStart);

            FileSystemBitmap bitmap = new FileSystemBitmap(fs._totalBlocks);

            if (!formatOnStart)
            {
                bitmap.LoadBitmap(fs.filestream, fs._blockSize);
            }
            else
            {
                bitmap.OccupyBlock(0);
                bitmap.OccupyBlock(1);
                bitmap.OccupyBlock(2);
                bitmap.WriteBitmap(fs.filestream, fs._blockSize);
            }

            Console.WriteLine("Commands: mkdir, rmdir, cd, ls, write, write+append, cat, rm, import, export, cp, paste, end");
            string? command;

            while ((command = Console.ReadLine()) != null)
            {
                if (command == "help")
                {
                    Console.WriteLine("Commands: mkdir, rmdir, cd, ls, write, write+append, cat, rm, import, export, cp, paste, end");
                }
                else if (command == "mkdir")
                {
                    Console.WriteLine("Enter directory name:");
                    string? name = Console.ReadLine();
                    if (TextUtils.IsNullOrWhiteSpace(name)) continue;

                    if (!fs.IsNameFree(name))
                    {
                        Console.WriteLine("Name already used.");
                        continue;
                    }

                    fs.CreateDir(name);
                }
                else if (command == "rmdir")
                {
                    Console.WriteLine("Enter directory name:");
                    string? name = Console.ReadLine();
                    if (TextUtils.IsNullOrWhiteSpace(name)) continue;
                    fs.DeleteDir(name);
                }
                else if (command == "cd")
                {
                    Console.WriteLine("Which directory you want to go to:");
                    string? dirName = Console.ReadLine();
                    if (TextUtils.IsNullOrWhiteSpace(dirName)) continue;
                    fs.ChangeDir(dirName);
                    Console.WriteLine("Your current directory is: " + fs.currentDirectory);
                }
                else if (command == "ls")
                {
                    fs.ListContent();
                }
                else if (command == "write")
                {
                    Console.WriteLine("Write the name of the file you want to create:");
                    string? fileName = Console.ReadLine();
                    if (TextUtils.IsNullOrWhiteSpace(fileName)) continue;

                    if (!fs.IsNameFree(fileName))
                    {
                        Console.WriteLine("There is already a file/dir with such name.");
                        continue;
                    }

                    Console.WriteLine("Write the content of the file:");
                    string? content = Console.ReadLine();

                    int freeBlock = bitmap.FindFirstFreeBlock();
                    if (freeBlock == -1 || freeBlock >= fs._totalBlocks)
                    {
                        Console.WriteLine("No free blocks available.");
                        continue;
                    }

                    bool ok = fs.CreateFile(fileName, content ?? "", freeBlock);
                    if (ok)
                    {
                        bitmap.OccupyBlock(freeBlock);
                        bitmap.WriteBitmap(fs.filestream, fs._blockSize);
                        Console.WriteLine("The content is added");
                    }
                }
                else if (command == "write+append")
                {
                    Console.WriteLine("Write the name of the file you want to write in:");
                    string? fileName = Console.ReadLine();
                    if (TextUtils.IsNullOrWhiteSpace(fileName)) continue;

                    Console.WriteLine("Write the content:");
                    string? content = Console.ReadLine();

                    fs.WriteToFile(content ?? "", fileName);
                }
                else if (command == "cat")
                {
                    Console.WriteLine("Enter the name of the file you want to see:");
                    string? fileName = Console.ReadLine();
                    if (TextUtils.IsNullOrWhiteSpace(fileName)) continue;

                    Console.WriteLine(fs.ShowFileContent(fileName));
                }
                else if (command == "rm")
                {
                    Console.WriteLine("Enter the name of the file you want to delete:");
                    string? fileName = Console.ReadLine();
                    if (TextUtils.IsNullOrWhiteSpace(fileName)) continue;

                    int block = fs.FindFileBlock(fileName);
                    if (block == -1)
                    {
                        Console.WriteLine("No such file in current directory.");
                        continue;
                    }

                    fs.DeleteFile(fileName);
                    bitmap.FreeBlock(block);
                    bitmap.WriteBitmap(fs.filestream, fs._blockSize);
                }
                else if (command == "export")
                {
                    Console.WriteLine("Enter the name of the file you want to export:");
                    string? fileName = Console.ReadLine();
                    if (TextUtils.IsNullOrWhiteSpace(fileName)) continue;

                    Console.WriteLine("Enter output file name (without .txt):");
                    string? outName = Console.ReadLine();
                    if (TextUtils.IsNullOrWhiteSpace(outName)) continue;

                    fs.ExportFile(fileName, outName);
                }
                else if (command == "import")
                {
                    Console.WriteLine("Enter the path of the external file you want to import:");
                    string? path = Console.ReadLine();
                    if (TextUtils.IsNullOrWhiteSpace(path)) continue;

                    Console.WriteLine("Enter the name of the internal file where you want to store this information:");
                    string? internalFile = Console.ReadLine();
                    if (TextUtils.IsNullOrWhiteSpace(internalFile)) continue;

                    fs.ImportFile(path, internalFile);
                }
                else if (command == "cp")
                {
                    Console.WriteLine("Enter the name of the file you want to copy:");
                    string? fileName = Console.ReadLine();
                    if (TextUtils.IsNullOrWhiteSpace(fileName)) continue;
                    fs.CopyFileToBuffer(fileName);
                }
                else if (command == "paste")
                {
                    Console.WriteLine("Enter new file name to create from buffer:");
                    string? newName = Console.ReadLine();
                    if (TextUtils.IsNullOrWhiteSpace(newName)) continue;

                    if (!fs.IsNameFree(newName))
                    {
                        Console.WriteLine("Name already used.");
                        continue;
                    }

                    int freeBlock = bitmap.FindFirstFreeBlock();
                    if (freeBlock == -1 || freeBlock >= fs._totalBlocks)
                    {
                        Console.WriteLine("No free blocks available.");
                        continue;
                    }

                    bool ok = fs.PasteFromBuffer(newName, freeBlock);
                    if (ok)
                    {
                        bitmap.OccupyBlock(freeBlock);
                        bitmap.WriteBitmap(fs.filestream, fs._blockSize);
                    }
                }
                else if (command == "end")
                {
                    break;
                }
                else
                {
                    Console.WriteLine("Unknown command. Type help.");
                }
            }
        }
    }
}