Pull Request for Varga Vajk

VajkVarga/Library/Library.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.1.32414.318
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Library", "Library\Library.csproj", "{45BC14A8-30C2-4E49-992D-1688590AC968}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{45BC14A8-30C2-4E49-992D-1688590AC968}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{45BC14A8-30C2-4E49-992D-1688590AC968}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{45BC14A8-30C2-4E49-992D-1688590AC968}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{45BC14A8-30C2-4E49-992D-1688590AC968}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {4EDD2B31-371D-4F65-951A-348A410832A9}
+	EndGlobalSection
+EndGlobal

VajkVarga/Library/Library/BookManager.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Library.Entities;
+
+namespace Library
+{
+    internal class BookManager
+    {
+        private readonly List<Book> Books;
+
+        public BookManager(List<Book> books)
+        {
+            Books = books.Distinct().ToList();
+        }
+
+        internal void StartConsoleLoop()
+        {
+            while (true)
+            {
+                Console.WriteLine("Choose from the following options or type \"exit\" to quit:");
+                Console.WriteLine("1 - Get all book data");
+                Console.WriteLine("2 - Get all books published before 1991");
+                var userInput = Console.ReadLine();
+                switch (userInput)
+                {
+                    case "1":
+                        ShowAllBook();
+                        break;
+                    case "2":
+                        ShowBooksPublishedBefore(1991);
+                        break;
+                    case "exit":
+                        return;
+                    default:
+                        Console.WriteLine("Invalid line, type \"1\", \"2\" or \"exit\"");
+                        break;
+                }
+            }
+        }
+
+        internal void ShowAllBook()
+        {
+            ShowBooks(Books);
+        }
+
+        internal void ShowBooksPublishedBefore(int year)
+        {
+            ShowBooks(Books.Where(b => b.PublishYear < year));
+        }
+
+        private void ShowBooks(IEnumerable<Book> books)
+        {
+            foreach (var book in books)
+            {
+                Console.WriteLine($"Title: {book.Title}");
+                Console.WriteLine($"Author: {book.Author}");
+                Console.WriteLine($"PublishYear: {book.PublishYear}");
+                Console.WriteLine($"ReceivedDate: {book.ReceivedDate.ToString("yyyy-MM-dd")}");
+                Console.WriteLine();
+            }
+        }
+    }
+}

VajkVarga/Library/Library/Entities/Book.cs

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+using System;
+
+namespace Library.Entities
+{
+    internal record Book
+    {
+        public Guid Id { get; set; }
+
+        public string Title { get; init; }
+
+        public string Author { get; init; }
+
+        public int PublishYear { get; init; }        
+
+        public DateTime ReceivedDate { get; init; }
+    }
+}

VajkVarga/Library/Library/FileReader.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text.Json;
+using System.Threading.Tasks;
+using Library.Entities;
+using Library.Serializer;
+
+namespace Library
+{
+    internal static class FileReader
+    {
+        public static List<Book> ReadAllBooks()
+        {
+            Console.WriteLine("Reading all books...");
+            var now = DateTime.Now;
+
+            var directory = @"../../../Resources";
+            if (!Directory.Exists(directory))
+            {
+                Console.WriteLine($"Error: Cannot find directory {directory}.");
+                return new();
+            }
+
+            var files = Directory.GetFiles(directory, "*.json", SearchOption.AllDirectories);
+
+            var fileContents = new List<string>();
+            var tasks = new List<Task<string>>();
+            foreach (var file in files)
+            {
+                var task = Task.Run(() => ReadFileContent(file));
+                tasks.Add(task);
+            }
+            Task.WaitAll(tasks.ToArray());
+            fileContents.AddRange(tasks.Select(task => task.Result));
+
+            var books = new List<Book>();
+            foreach (var fileContent in fileContents)
+            {
+                try
+                {
+                    books.AddRange(JsonSerializer.Deserialize<List<Book>>(fileContent, new JsonSerializerOptions
+                    {
+                        WriteIndented = true,
+                        Converters =
+                        {
+                            new CustomDateJsonConverter()
+                        }
+                    }));
+                }
+                catch (Exception)
+                {
+                    Console.WriteLine($"Error: Couldn't deserialize content.");
+                    return new();
+                }
+            }
+
+            books = books.Where(b => b.Id != Guid.Empty && b.ReceivedDate.Year >= b.PublishYear &&
+                !String.IsNullOrEmpty(b.Title) && !String.IsNullOrEmpty(b.Author)).ToList();
+
+            Console.WriteLine($"Successfully read {books.Count}({books.Distinct().Count()} distinct) books in {(DateTime.Now - now).TotalSeconds} seconds.");
+            return books.Distinct().ToList();
+        }
+
+        private static Task<string> ReadFileContent(string file)
+        {
+            return File.ReadAllTextAsync(file); 
+        }
+    }
+}

VajkVarga/Library/Library/Library.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net5.0</TargetFramework>
+  </PropertyGroup>
+
+</Project>

VajkVarga/Library/Library/Program.cs

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+using System;
+using System.Linq;
+
+namespace Library
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            Console.WriteLine("Welcome to my library!");
+
+            var books = FileReader.ReadAllBooks();
+            if (!books.Any())
+            {
+                Console.WriteLine("No books found, exiting from program.");
+                return;
+            }
+
+            var bookManager = new BookManager(books);
+            bookManager.StartConsoleLoop();
+        }
+    }
+}