From ff3bed5c69d9cd116550ca95be00d9871c972565 Mon Sep 17 00:00:00 2001
From: Alex Hyett <alex@hyett.me>
Date: Mon, 4 Sep 2023 10:17:26 +0100
Subject: [PATCH] Add facade code

---
 Facade/BadLogger.cs  | 14 +++++++++++++
 Facade/Facade.csproj | 10 +++++++++
 Facade/ILogger.cs    |  8 ++++++++
 Facade/LogType.cs    |  6 ++++++
 Facade/Logger.cs     | 23 +++++++++++++++++++++
 Facade/Program.cs    | 49 ++++++++++++++++++++++++++++++++++++++++++++
 6 files changed, 110 insertions(+)
 create mode 100644 Facade/BadLogger.cs
 create mode 100644 Facade/Facade.csproj
 create mode 100644 Facade/ILogger.cs
 create mode 100644 Facade/LogType.cs
 create mode 100644 Facade/Logger.cs
 create mode 100644 Facade/Program.cs

diff --git a/Facade/BadLogger.cs b/Facade/BadLogger.cs
new file mode 100644
index 0000000..7e6fd11
--- /dev/null
+++ b/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);
+        }
+    }
+}
\ No newline at end of file
diff --git a/Facade/Facade.csproj b/Facade/Facade.csproj
new file mode 100644
index 0000000..0cf87a2
--- /dev/null
+++ b/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>
\ No newline at end of file
diff --git a/Facade/ILogger.cs b/Facade/ILogger.cs
new file mode 100644
index 0000000..c33c09b
--- /dev/null
+++ b/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);
+}
\ No newline at end of file
diff --git a/Facade/LogType.cs b/Facade/LogType.cs
new file mode 100644
index 0000000..d095aee
--- /dev/null
+++ b/Facade/LogType.cs
@@ -0,0 +1,6 @@
+public enum LogType
+{
+    Info = 0,
+    Error = 1,
+    Fatal = 2
+}
\ No newline at end of file
diff --git a/Facade/Logger.cs b/Facade/Logger.cs
new file mode 100644
index 0000000..0a753f0
--- /dev/null
+++ b/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);
+    }
+}
\ No newline at end of file
diff --git a/Facade/Program.cs b/Facade/Program.cs
new file mode 100644
index 0000000..3657b2e
--- /dev/null
+++ b/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);
+}
\ No newline at end of file