From 018f365812cd9d64439b31a8719272c656107384 Mon Sep 17 00:00:00 2001
From: Cory Bennett <csquaredbennett@gmail.com>
Date: Sat, 4 Jan 2025 19:35:11 -0600
Subject: [PATCH] [MTGOSDK/API/Play] Tournament: Fix round, endtime calculation

Re-compute the number of rounds and end-time based on the type of tournament elimination style and by the number of players in the event.
---
 .../src/API/Play/Tournaments/Tournament.cs    | 61 ++++++++++++++++++-
 .../Tournaments/TournamentEliminationStyle.cs | 13 ++++
 2 files changed, 72 insertions(+), 2 deletions(-)
 create mode 100644 MTGOSDK/src/API/Play/Tournaments/TournamentEliminationStyle.cs

diff --git a/MTGOSDK/src/API/Play/Tournaments/Tournament.cs b/MTGOSDK/src/API/Play/Tournaments/Tournament.cs
index d6afdc74..ca8e30af 100644
--- a/MTGOSDK/src/API/Play/Tournaments/Tournament.cs
+++ b/MTGOSDK/src/API/Play/Tournaments/Tournament.cs
@@ -36,12 +36,36 @@ public sealed class Tournament(dynamic tournament) : Event
   /// <summary>
   /// The time the event is scheduled to end.
   /// </summary>
-  public DateTime EndTime => @base.ScheduledEndTime;
+  /// <remarks>
+  /// This is a rough approximation of the end time, based on the current number
+  /// of players in the tournament. The actual end time may be earlier than this
+  /// time if a round finishes early.
+  /// </remarks>
+  public DateTime EndTime
+  {
+    get
+    {
+      DateTime endTime = StartTime.AddMinutes(
+        // Minutes per round + 2 minutes between rounds.
+        ((2 * Unbind(@base).MatchTimeLimit) * TotalRounds) +
+        (2 * (TotalRounds - 1)) +
+        // Minutes for deckbuilding.
+        Try<int>(() => Unbind(@base).MinutesForDeckbuilding)
+      );
+
+      // Round up to the nearest 10 minutes.
+      return endTime.AddMinutes(10 - (endTime.Minute % 10));
+    }
+  }
 
   /// <summary>
   /// The number of rounds in the tournament.
   /// </summary>
-  public int TotalRounds => @base.TotalRounds;
+  public int TotalRounds =>
+    EliminationStyle == TournamentEliminationStyle.Swiss
+      ? Math.Max(@base.TotalRounds, Math.Max(GetNumberOfRounds(TotalPlayers),
+                                             GetNumberOfRounds(MinimumPlayers)))
+      : @base.TotalRounds;
 
   //
   // ITournament wrapper properties
@@ -54,6 +78,15 @@ public sealed class Tournament(dynamic tournament) : Event
   public TournamentState State =>
     Cast<TournamentState>(Unbind(@base).State);
 
+  /// <summary>
+  /// The kind of elimination style used in the tournament
+  /// (i.e. "Swiss", "SingleElimination")
+  /// </summary>
+  public TournamentEliminationStyle EliminationStyle =>
+    Try(() => Cast<TournamentEliminationStyle>(
+                  Unbind(@base).TournamentEliminationStyle),
+        fallback: TournamentEliminationStyle.Swiss);
+
   /// <summary>
   /// The time remaining in the current round or tournament phase.
   /// </summary>
@@ -91,6 +124,30 @@ public sealed class Tournament(dynamic tournament) : Event
       .OrderByDescending(s => s.Rank)
       .ToList();
 
+  //
+  // ITournament wrapper methods
+  //
+
+  /// <summary>
+  /// Computes the number of rounds for a given size tournament.
+  /// </summary>
+  /// <param name="players">The number of players in the tournament.</param>
+  /// <returns>The number of rounds required for the given number of players.</returns>
+  public static int GetNumberOfRounds(int players) =>
+    players switch
+    {
+      >=   2 and <=   3 => 2,
+      >=   4 and <=   8 => 3,
+      >=   9 and <=  16 => 4,
+      >=  17 and <=  32 => 5,
+      >=  33 and <=  64 => 6,
+      >=  65 and <= 128 => 7,
+      >= 129 and <= 226 => 8,
+      >= 227 and <= 409 => 9,
+      >= 410 => 10,
+      _ => 1
+    };
+
   //
   // ITournament wrapper events
   //
diff --git a/MTGOSDK/src/API/Play/Tournaments/TournamentEliminationStyle.cs b/MTGOSDK/src/API/Play/Tournaments/TournamentEliminationStyle.cs
new file mode 100644
index 00000000..a97121cd
--- /dev/null
+++ b/MTGOSDK/src/API/Play/Tournaments/TournamentEliminationStyle.cs
@@ -0,0 +1,13 @@
+/** @file
+  Copyright (c) 2024, Cory Bennett. All rights reserved.
+  SPDX-License-Identifier: Apache-2.0
+**/
+
+namespace MTGOSDK.API.Play.Tournaments;
+
+public enum TournamentEliminationStyle
+{
+  Invalid,
+  Swiss,
+  SingleElimination
+}