1v1 me first to 31 no powerups [Deathmatch Gamemode] (#19467)

Co-authored-by: Kara <lunarautomaton6@gmail.com>

Content.Shared/Points/SharedPointSystem.cs

@@ -0,0 +1,86 @@
+using Content.Shared.FixedPoint;
+using Robust.Shared.Network;
+using Robust.Shared.Utility;
+
+namespace Content.Shared.Points;
+
+/// <summary>
+/// This handles modifying point counts for <see cref="PointManagerComponent"/>
+/// </summary>
+public abstract class SharedPointSystem : EntitySystem
+{
+    /// <summary>
+    /// Adds the specified point value to a player.
+    /// </summary>
+    public void AdjustPointValue(NetUserId userId, FixedPoint2 value, EntityUid uid, PointManagerComponent? component = null)
+    {
+        if (!Resolve(uid, ref component))
+            return;
+
+        if (!component.Points.TryGetValue(userId, out var current))
+            current = 0;
+
+        SetPointValue(userId, current + value, uid, component);
+    }
+
+    /// <summary>
+    /// Sets the amount of points for a player
+    /// </summary>
+    public void SetPointValue(NetUserId userId, FixedPoint2 value, EntityUid uid, PointManagerComponent? component = null)
+    {
+        if (!Resolve(uid, ref component))
+            return;
+
+        if (component.Points.TryGetValue(userId, out var current) && current == value)
+            return;
+
+        component.Points[userId] = value;
+        component.Scoreboard = GetScoreboard(uid, component);
+        Dirty(uid, component);
+
+        var ev = new PlayerPointChangedEvent(userId, value);
+        RaiseLocalEvent(uid, ref ev, true);
+    }
+
+    /// <summary>
+    /// Gets the amount of points for a given player
+    /// </summary>
+    public FixedPoint2 GetPointValue(NetUserId userId, EntityUid uid, PointManagerComponent? component = null)
+    {
+        if (!Resolve(uid, ref component))
+            return FixedPoint2.Zero;
+
+        return component.Points.TryGetValue(userId, out var value)
+            ? value
+            : FixedPoint2.Zero;
+    }
+
+    /// <summary>
+    /// Ensures that a player is being tracked by the PointManager, giving them a default score of 0.
+    /// </summary>
+    public void EnsurePlayer(NetUserId userId, EntityUid uid, PointManagerComponent? component = null)
+    {
+        if (!Resolve(uid, ref component))
+            return;
+
+        if (component.Points.ContainsKey(userId))
+            return;
+        SetPointValue(userId, FixedPoint2.Zero, uid, component);
+    }
+
+    /// <summary>
+    /// Returns a formatted message containing a ranking of all the currently online players and their scores.
+    /// </summary>
+    public virtual FormattedMessage GetScoreboard(EntityUid uid, PointManagerComponent? component = null)
+    {
+        return new FormattedMessage();
+    }
+}
+
+/// <summary>
+/// Event raised on the point manager entity and broadcasted whenever a player's points change.
+/// </summary>
+/// <param name="Player"></param>
+/// <param name="Points"></param>
+[ByRefEvent]
+public readonly record struct PlayerPointChangedEvent(NetUserId Player, FixedPoint2 Points);