Fluid spread refactor (#11908)

Co-authored-by: metalgearsloth <31366439+metalgearsloth@users.noreply.github.com>
Fix undefined

Content.Server/Fluids/Components/FluidMapDataComponent.cs

@@ -0,0 +1,35 @@
+using Content.Server.Fluids.EntitySystems;
+using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom;
+
+namespace Content.Server.Fluids.Components;
+
+[RegisterComponent]
+[Access(typeof(FluidSpreaderSystem))]
+public sealed class FluidMapDataComponent : Component
+{
+    /// <summary>
+    /// At what time will <see cref="FluidSpreaderSystem"/> be checked next
+    /// </summary>
+    [DataField("goalTime", customTypeSerializer:typeof(TimeOffsetSerializer))]
+    public TimeSpan GoalTime;
+
+    /// <summary>
+    /// Delay between two runs of <see cref="FluidSpreaderSystem"/>
+    /// </summary>
+    [DataField("delay")]
+    public TimeSpan Delay = TimeSpan.FromSeconds(2);
+
+    /// <summary>
+    /// Puddles to be expanded.
+    /// </summary>
+    [DataField("puddles")] public HashSet<EntityUid> Puddles = new();
+
+    /// <summary>
+    /// Convenience method for setting GoalTime to <paramref name="start"/> + <see cref="Delay"/>
+    /// </summary>
+    /// <param name="start">Time to which to add <see cref="Delay"/>, defaults to current <see cref="GoalTime"/></param>
+    public void UpdateGoal(TimeSpan? start = null)
+    {
+        GoalTime = (start ?? GoalTime) + Delay;
+    }
+}