Adds a new SolutionExplosionBehavior for the benefit of fuel tanks and future exploding canisters (#11260)

Content.Server/Destructible/Thresholds/Behaviors/SolutionExplosionBehavior.cs

@@ -0,0 +1,46 @@
+using Content.Server.Chemistry.EntitySystems;
+using Content.Server.Fluids.Components;
+using Content.Server.Fluids.EntitySystems;
+using Content.Server.Explosion.Components;
+using JetBrains.Annotations;
+
+namespace Content.Server.Destructible.Thresholds.Behaviors
+{
+    /// <summary>
+    /// Works like a SpillBehavior combined with an ExplodeBehavior
+    /// </summary>
+    [UsedImplicitly]
+    [DataDefinition]
+    public sealed class SolutionExplosionBehavior : IThresholdBehavior
+    {
+        [DataField("solution", required: true)]
+        public string Solution = default!;
+
+        public void Execute(EntityUid owner, DestructibleSystem system)
+        {
+            if (system.SolutionContainerSystem.TryGetSolution(owner, Solution, out var explodingSolution)
+                && system.EntityManager.TryGetComponent(owner, out ExplosiveComponent? explosiveComponent))
+            {
+                // Don't explode if there's no solution
+                if (explodingSolution.CurrentVolume == 0)
+                    return;
+
+                // Scale the explosion intensity based on the remaining volume of solution
+                var explosionScaleFactor = (explodingSolution.CurrentVolume.Float() / explodingSolution.MaxVolume.Float());
+
+                // TODO: Perhaps some of the liquid should be discarded as if it's being consumed by the explosion
+
+                // Spill the solution out into the world
+                // Spill before exploding in anticipation of a future where the explosion can light the solution on fire.
+                var coordinates = system.EntityManager.GetComponent<TransformComponent>(owner).Coordinates;
+                system.SpillableSystem.SpillAt(explodingSolution, coordinates, "PuddleSmear", combine: true);
+
+                // Explode
+                // Don't delete the object here - let other processes like physical damage from the
+                // explosion clean up the exploding object(s)
+                var explosiveTotalIntensity = explosiveComponent.TotalIntensity * explosionScaleFactor;
+                system.ExplosionSystem.TriggerExplosive(owner, explosiveComponent, false, explosiveTotalIntensity);
+            }
+        }
+    }
+}