feat: add session capacity waitlist

src/GmRelay.Bot/Features/Sessions/CreateSession/NewSessionCommandParser.cs

@@ -5,14 +5,17 @@ namespace GmRelay.Bot.Features.Sessions.CreateSession;
 internal sealed record NewSessionParseResult(
     string? Title,
     string? Link,
+    int? MaxPlayers,
     IReadOnlyList<DateTimeOffset> ScheduledTimes,
     IReadOnlyList<string> PastTimeInputs,
-    IReadOnlyList<string> InvalidTimeInputs)
+    IReadOnlyList<string> InvalidTimeInputs,
+    IReadOnlyList<string> InvalidSeatLimitInputs)
 {
     public bool IsValid =>
         !string.IsNullOrWhiteSpace(Title) &&
         !string.IsNullOrWhiteSpace(Link) &&
-        ScheduledTimes.Count > 0;
+        ScheduledTimes.Count > 0 &&
+        InvalidSeatLimitInputs.Count == 0;
 }
 
 internal static class NewSessionCommandParser
@@ -20,14 +23,22 @@ internal static class NewSessionCommandParser
     private const string TitlePrefix = "\u041d\u0430\u0437\u0432\u0430\u043d\u0438\u0435:";
     private const string TimePrefix = "\u0412\u0440\u0435\u043c\u044f:";
     private const string LinkPrefix = "\u0421\u0441\u044b\u043b\u043a\u0430:";
+    private static readonly string[] SeatLimitPrefixes =
+    [
+        "\u041c\u0435\u0441\u0442:",
+        "\u041b\u0438\u043c\u0438\u0442:",
+        "\u041c\u0430\u043a\u0441\u0438\u043c\u0443\u043c:"
+    ];
 
     public static NewSessionParseResult Parse(string? text, DateTimeOffset nowUtc)
     {
         string? title = null;
         string? link = null;
+        int? maxPlayers = null;
         var scheduledTimes = new List<DateTimeOffset>();
         var pastTimeInputs = new List<string>();
         var invalidTimeInputs = new List<string>();
+        var invalidSeatLimitInputs = new List<string>();
 
         foreach (var line in (text ?? string.Empty).Split('\n', StringSplitOptions.TrimEntries))
         {
@@ -43,6 +54,23 @@ internal static class NewSessionCommandParser
                 continue;
             }
 
+            var seatLimitPrefix = SeatLimitPrefixes.FirstOrDefault(prefix =>
+                line.StartsWith(prefix, StringComparison.OrdinalIgnoreCase));
+            if (seatLimitPrefix is not null)
+            {
+                var seatLimitInput = line[seatLimitPrefix.Length..].Trim();
+                if (int.TryParse(seatLimitInput, out var parsedMaxPlayers) && parsedMaxPlayers > 0)
+                {
+                    maxPlayers = parsedMaxPlayers;
+                }
+                else
+                {
+                    invalidSeatLimitInputs.Add(seatLimitInput);
+                }
+
+                continue;
+            }
+
             if (!line.StartsWith(TimePrefix, StringComparison.OrdinalIgnoreCase))
             {
                 continue;
@@ -64,6 +92,13 @@ internal static class NewSessionCommandParser
             scheduledTimes.Add(scheduledAt);
         }
 
-        return new NewSessionParseResult(title, link, scheduledTimes, pastTimeInputs, invalidTimeInputs);
+        return new NewSessionParseResult(
+            title,
+            link,
+            maxPlayers,
+            scheduledTimes,
+            pastTimeInputs,
+            invalidTimeInputs,
+            invalidSeatLimitInputs);
     }
 }