RareReply: 人間味を持たせる

Common/MasterManager.cs

@@ -2,7 +2,9 @@
 
 public static class MasterManager
 {
-    public static double ReplyRate => 0.05;
+    public static float ReplyRate => 0.05f;
+    public static float ReplyMaxDelay => 2f;
+    public static float TypingMaxDelay => 1f;
 
     public static IReadOnlyList<(float rate, string message)> ReplyMessages => new List<(float rate, string message)>
     {

Common/RandomUtility.cs

@@ -0,0 +1,16 @@
+namespace Approvers.King.Common;
+
+public static class RandomUtility
+{
+    private static readonly Random Random = new();
+
+    public static float GetRandomFloat(float max)
+    {
+        return GetRandomFloat(0f, max);
+    }
+
+    public static float GetRandomFloat(float min, float max)
+    {
+        return (float)(min + (max - min) * Random.NextDouble());
+    }
+}

DiscordEntry.cs

@@ -17,6 +17,6 @@ private static async Task OnMessageReceived(SocketMessage message)
         if (message is not SocketUserMessage userMessage || userMessage.Author.IsBot) return;
 
         // 発言
-        await DiscordManager.ExecuteAsync<ReplyPresenter>(userMessage);
+        await DiscordManager.ExecuteAsync<RareReplyPresenter>(userMessage);
     }
 }

Events/RareReplyPresenter.cs

@@ -0,0 +1,34 @@
+using Approvers.King.Common;
+using Discord;
+
+namespace Approvers.King.Events;
+
+public class RareReplyPresenter : DiscordMessagePresenterBase
+{
+    protected override async Task MainAsync()
+    {
+        if (RandomUtility.GetRandomFloat(1f) > MasterManager.ReplyRate) return;
+
+        await Task.Delay(TimeSpan.FromSeconds(RandomUtility.GetRandomFloat(MasterManager.ReplyMaxDelay)));
+        using (Message.Channel.EnterTypingState())
+        {
+            await Task.Delay(TimeSpan.FromSeconds(RandomUtility.GetRandomFloat(MasterManager.TypingMaxDelay)));
+            await Message.ReplyAsync(PickRandomMessage());
+        }
+    }
+
+    private static string PickRandomMessage()
+    {
+        var totalRate = MasterManager.ReplyMessages.Sum(x => x.rate);
+        var value = RandomUtility.GetRandomFloat(totalRate);
+
+        foreach (var (rate, message) in MasterManager.ReplyMessages)
+        {
+            if (value < rate) return message;
+
+            value -= rate;
+        }
+
+        return MasterManager.ReplyMessages[^1].message;
+    }
+}