Gacha: 10連ガチャ機能の実装

Common/MasterManager.cs

@@ -43,4 +43,11 @@ public static class MasterManager
     };
 
     public static TimeSpan SilentTimeSpan => TimeSpan.FromMinutes(5);
+
+    public static IReadOnlyList<string> GachaTriggerMessages => new List<string>
+    {
+        "10連",
+        "ガチャ",
+        "おみくじ",
+    };
 }

Common/RandomUtility.cs

@@ -13,4 +13,9 @@ public static float GetRandomFloat(float min, float max)
     {
         return (float)(min + (max - min) * Random.NextDouble());
     }
+
+    public static bool IsHit(float probability)
+    {
+        return GetRandomFloat(1f) <= probability;
+    }
 }

Events/GachaCommandPresenter.cs

@@ -0,0 +1,30 @@
+using System.Text;
+using Approvers.King.Common;
+using Discord;
+
+namespace Approvers.King.Events;
+
+public class GachaCommandPresenter : DiscordMessagePresenterBase
+{
+    private const int PickCount = 10;
+
+    protected override async Task MainAsync()
+    {
+        var results = Enumerable.Range(0, PickCount).Select(_ => Pick());
+
+        var builder = new StringBuilder();
+        builder.AppendLine($"↓↓↓ いっそう{PickCount}連おみくじ ↓↓↓");
+        foreach (var result in results)
+        {
+            builder.AppendLine(result != null ? Discord.Format.Bold($"・{result}") : Discord.Format.Code("x"));
+        }
+
+        await Message.ReplyAsync(builder.ToString());
+    }
+
+    private static string? Pick()
+    {
+        if (RandomUtility.IsHit(MasterManager.ReplyRate) == false) return null;
+        return MessageUtility.PickRandomMessage();
+    }
+}

Events/RareReplyPresenter.cs

@@ -8,7 +8,7 @@ public class RareReplyPresenter : DiscordMessagePresenterBase
     protected override async Task MainAsync()
     {
         if (SilentManager.IsSilent(Message.Author.Id) ||
-            RandomUtility.GetRandomFloat(1f) > MasterManager.ReplyRate) return;
+            RandomUtility.IsHit(MasterManager.ReplyRate) == false) return;
 
         await Task.Delay(TimeSpan.FromSeconds(RandomUtility.GetRandomFloat(MasterManager.ReplyMaxDelay)));
         using (Message.Channel.EnterTypingState())

Triggers/DiscordTrigger.cs

@@ -25,6 +25,13 @@ private static async Task OnMessageReceived(SocketMessage message)
                 return;
             }
 
+            if (MasterManager.GachaTriggerMessages.Any(userMessage.Content.Contains))
+            {
+                // 10連ガチャ
+                await DiscordManager.ExecuteAsync<GachaCommandPresenter>(userMessage);
+                return;
+            }
+
             // 返信
             await DiscordManager.ExecuteAsync<InteractReplyPresenter>(userMessage);
             return;