A return to foam (foam rework) (#20831)

Content.Shared/Chemistry/Components/SmokeAffectedComponent.cs

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+using Robust.Shared.GameStates;
+using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom;
+
+namespace Content.Shared.Chemistry.Components;
+
+/// <summary>
+/// This is used for entities which are currently being affected by smoke.
+/// Manages the gradual metabolism every second.
+/// </summary>
+[RegisterComponent, NetworkedComponent]
+public sealed partial class SmokeAffectedComponent : Component
+{
+    /// <summary>
+    /// The time at which the next smoke metabolism will occur.
+    /// </summary>
+    [DataField(customTypeSerializer: typeof(TimeOffsetSerializer))]
+    public TimeSpan NextSecond;
+
+    /// <summary>
+    /// The smoke that is currently affecting this entity.
+    /// </summary>
+    [DataField]
+    public EntityUid SmokeEntity;
+}

Content.Shared/Chemistry/Components/SmokeComponent.cs

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+using Content.Shared.FixedPoint;
+using Content.Shared.Fluids.Components;
+using Robust.Shared.GameStates;
+
+namespace Content.Shared.Chemistry.Components;
+
+/// <summary>
+/// Stores solution on an anchored entity that has touch and ingestion reactions
+/// to entities that collide with it. Similar to <see cref="PuddleComponent"/>
+/// </summary>
+[RegisterComponent, NetworkedComponent, AutoGenerateComponentState]
+public sealed partial class SmokeComponent : Component
+{
+    public const string SolutionName = "solutionArea";
+
+    /// <summary>
+    /// The max amount of tiles this smoke cloud can spread to.
+    /// </summary>
+    [DataField, ViewVariables(VVAccess.ReadWrite)]
+    public int SpreadAmount;
+
+    /// <summary>
+    /// The max rate at which chemicals are transferred from the smoke to the person inhaling it.
+    /// Calculated as (total volume of chemicals in smoke) / (<see cref="Duration"/>)
+    /// </summary>
+    [DataField, ViewVariables(VVAccess.ReadWrite)]
+    public FixedPoint2 TransferRate;
+
+    /// <summary>
+    /// The total lifespan of the smoke.
+    /// </summary>
+    [DataField, ViewVariables(VVAccess.ReadWrite), AutoNetworkedField]
+    public float Duration = 10;
+}