add part of the dialog and implement logging to console

SimpleTGBot/Logging/LogLevel.cs

@@ -0,0 +1,19 @@
+namespace SimpleTGBot.Logging;
+
+internal enum LogLevel : int
+{
+    Debug = 0, Info, Warning, Error, Fatal
+}
+static class LogLevelExt
+{
+    public static string GetName(this LogLevel level)
+    {
+        return level switch {
+            LogLevel.Debug => "DEBUG",
+            LogLevel.Info => "INFO",
+            LogLevel.Warning => "WARN",
+            LogLevel.Error => "ERROR",
+            LogLevel.Fatal => "FATAL"
+        };
+    }
+}

SimpleTGBot/Logging/LogSink.cs

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+namespace SimpleTGBot.Logging;
+
+internal interface ILogSink : IDisposable
+{
+    public void Log(DateTime time, LogLevel level, string message);
+}

SimpleTGBot/Logging/Logger.cs

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+namespace SimpleTGBot.Logging;
+
+internal class Logger : IDisposable
+{
+    public List<ILogSink> Sinks;
+
+    public Logger(params ILogSink[] sinks)
+    {
+        Sinks = new List<ILogSink>(sinks);
+    }
+
+    public void Log(LogLevel level, string message)
+    {
+        DateTime now = DateTime.Now;
+        foreach (var sink in Sinks)
+        {
+            sink.Log(now, level, message);
+        }
+    }
+
+    public void Debug(string message) => Log(LogLevel.Debug, message);
+    public void Info(string message) => Log(LogLevel.Info, message);
+    public void Warn(string message) => Log(LogLevel.Warning, message);
+    public void Error(string message) => Log(LogLevel.Error, message);
+    public void Fatal(string message) => Log(LogLevel.Fatal, message);
+
+    public void Dispose()
+    {
+        foreach (var sink in Sinks)
+        {
+            sink.Dispose();
+        }
+    }
+}

SimpleTGBot/Logging/StdoutSink.cs

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+namespace SimpleTGBot.Logging;
+
+internal class StdoutSink : ILogSink
+{
+    private readonly ConsoleColor[] colors = [ConsoleColor.White, ConsoleColor.Cyan, ConsoleColor.Yellow, ConsoleColor.DarkRed, ConsoleColor.Red];
+    private ConsoleColor originalConsoleColor;
+
+    public StdoutSink()
+    {
+        originalConsoleColor = Console.ForegroundColor;
+    }
+
+    public void Log(DateTime time, LogLevel level, string message)
+    {
+        Console.ForegroundColor = colors[(int)level];
+        foreach (string line in message.Split(Environment.NewLine))
+            Console.WriteLine($"({time:u}) [{level.GetName()}] {line}");
+    }
+
+    public void Dispose() {
+        Console.ForegroundColor = originalConsoleColor;
+    }
+}