Add facade code

Facade/BadLogger.cs

@@ -0,0 +1,14 @@
+public class BadLogger
+{
+    public void Log(string message, LogType logType, Exception? ex)
+    {
+        Console.WriteLine($"{DateTime.UtcNow:s} [{logType.ToString().ToUpper()}] {message}");
+
+        if (ex != null)
+        {
+            Console.WriteLine("Exception:");
+            Console.WriteLine(ex.Message);
+            Console.WriteLine(ex.StackTrace);
+        }
+    }
+}

Facade/Facade.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net7.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

Facade/ILogger.cs

@@ -0,0 +1,8 @@
+public interface ILogger
+{
+    void Information(string message);
+
+    void Error(string message, Exception? ex = null);
+
+    void Fatal(string message, Exception? ex = null);
+}

Facade/LogType.cs

@@ -0,0 +1,6 @@
+public enum LogType
+{
+    Info = 0,
+    Error = 1,
+    Fatal = 2
+}

Facade/Logger.cs

@@ -0,0 +1,23 @@
+public class Logger : ILogger
+{
+    private readonly BadLogger _logger;
+    public Logger()
+    {
+        _logger = new BadLogger();
+    }
+
+    public void Information(string message)
+    {
+        _logger.Log(message, LogType.Info, null);
+    }
+
+    public void Error(string message, Exception? ex = null)
+    {
+        _logger.Log(message, LogType.Error, ex);
+    }
+
+    public void Fatal(string message, Exception? ex = null)
+    {
+        _logger.Log(message, LogType.Fatal, ex);
+    }
+}

Facade/Program.cs

@@ -0,0 +1,49 @@
+using System;
+
+// Using the bad logger
+var badLogger = new BadLogger();
+
+badLogger.Log("This is an information message", LogType.Info, null);
+badLogger.Log("This is an error message", LogType.Error, null);
+
+try
+{
+    throw new InvalidOperationException("Something went wrong");
+}
+catch (Exception ex)
+{
+    badLogger.Log("This is an error message with exception", LogType.Error, ex);
+}
+
+try
+{
+    throw new InvalidOperationException("Something went really wrong");
+}
+catch (Exception ex)
+{
+    badLogger.Log("This is a fatal error message", LogType.Fatal, ex);
+}
+
+// Using the good logger
+ILogger logger = new Logger();
+
+logger.Information("This is an information message");
+logger.Error("This is an error message");
+
+try
+{
+    throw new InvalidOperationException("Something went wrong");
+}
+catch (Exception ex)
+{
+    logger.Error("This is an error message with exception", ex);
+}
+
+try
+{
+    throw new InvalidOperationException("Something went really wrong");
+}
+catch (Exception ex)
+{
+    logger.Fatal("This is a fatal error message", ex);
+}