Make fuel tanks explodey again (#4670)

* make fuel tanks explodey again

* tanks now take damage from lit welders,

Content.Server/Damage/Components/DamageOnToolInteractComponent.cs

@@ -13,19 +13,18 @@ namespace Content.Server.Damage.Components
     [RegisterComponent]
     public class DamageOnToolInteractComponent : Component, IInteractUsing
     {
-
         public override string Name => "DamageOnToolInteract";
 
         [DataField("tools")]
         private List<ToolQuality> _tools = new();
 
-        [DataField("weldingDamage", required: true)]
+        [DataField("weldingDamage")]
         [ViewVariables(VVAccess.ReadWrite)]
-        public DamageSpecifier WeldingDamage = default!;
+        public DamageSpecifier? WeldingDamage;
 
-        [DataField("defaultDamage", required: true)]
+        [DataField("defaultDamage")]
         [ViewVariables(VVAccess.ReadWrite)]
-        public DamageSpecifier DefaultDamage = default!;
+        public DamageSpecifier? DefaultDamage;
 
         async Task<bool> IInteractUsing.InteractUsing(InteractUsingEventArgs eventArgs)
         {
@@ -33,7 +32,7 @@ namespace Content.Server.Damage.Components
             {
                 foreach (var toolQuality in _tools)
                 {
-                    if (tool.HasQuality(ToolQuality.Welding) && toolQuality == ToolQuality.Welding)
+                    if (WeldingDamage != null && tool.HasQuality(ToolQuality.Welding) && toolQuality == ToolQuality.Welding)
                     {
                         if (eventArgs.Using.TryGetComponent(out WelderComponent? welder) && welder.WelderLit)
                         {
@@ -43,7 +42,7 @@ namespace Content.Server.Damage.Components
                         break; //If the tool quality is welding and its not lit or its not actually a welder that can be lit then its pointless to continue.
                     }
 
-                    if (tool.HasQuality(toolQuality))
+                    if (DefaultDamage != null && tool.HasQuality(toolQuality))
                     {
                         EntitySystem.Get<DamageableSystem>().TryChangeDamage(eventArgs.Target.Uid, DefaultDamage);
                         return true;

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

@@ -0,0 +1,21 @@
+using Content.Server.Explosion;
+using Content.Server.Explosion.Components;
+using JetBrains.Annotations;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Serialization.Manager.Attributes;
+
+namespace Content.Server.Destructible.Thresholds.Behaviors
+{
+    /// <summary>
+    ///     This behavior will trigger entities with <see cref="ExplosiveComponent"/> to go boom.
+    /// </summary>
+    [UsedImplicitly]
+    [DataDefinition]
+    public class ExplodeBehavior : IThresholdBehavior
+    {
+        public void Execute(IEntity owner, DestructibleSystem system)
+        {
+            owner.SpawnExplosion();  
+        }
+    }
+}

Content.Server/Explosion/Components/ExplosiveComponent.cs

@@ -1,11 +1,21 @@
+using Content.Server.Destructible.Thresholds.Behaviors;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Serialization.Manager.Attributes;
 
 namespace Content.Server.Explosion.Components
 {
     /// <summary>
-    /// Specifies an explosion range should this entity be exploded.
+    ///     Specifies an explosion range should this entity be exploded.
     /// </summary>
+    /// <remarks>
+    ///     Explosions can be caused by:
+    ///     <list type="bullet">
+    ///         <item>Reaching a damage threshold that causes a <see cref="ExplodeBehavior"/></item>
+    ///         <item>Being triggered via the <see cref="ExplodeOnTriggerComponent"/></item>
+    ///         <item>Manually by some other system via functions in <see cref="ExplosionHelper"/> (for example, chemistry's
+    ///         <see cref="ExplosionReactionEffect"/>).</item>
+    ///     </list>
+    /// </remarks>
     [RegisterComponent]
     public class ExplosiveComponent : Component
     {

Content.Server/Explosion/TriggerSystem.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using Content.Server.Explosion.Components;
 using Content.Server.Flash;
 using Content.Server.Flash.Components;
@@ -43,16 +43,9 @@ namespace Content.Server.Explosion
             SubscribeLocalEvent<SoundOnTriggerComponent, TriggerEvent>(HandleSoundTrigger);
             SubscribeLocalEvent<ExplodeOnTriggerComponent, TriggerEvent>(HandleExplodeTrigger);
             SubscribeLocalEvent<FlashOnTriggerComponent, TriggerEvent>(HandleFlashTrigger);
-
-            SubscribeLocalEvent<ExplosiveComponent, DestructionEventArgs>(HandleDestruction);
         }
 
         #region Explosions
-        private void HandleDestruction(EntityUid uid, ExplosiveComponent component, DestructionEventArgs args)
-        {
-            Explode(uid, component);
-        }
-
         private void HandleExplodeTrigger(EntityUid uid, ExplodeOnTriggerComponent component, TriggerEvent args)
         {
             if (!EntityManager.TryGetComponent(uid, out ExplosiveComponent? explosiveComponent)) return;

Content.Server/Tools/Components/WelderComponent.cs

@@ -301,13 +301,6 @@ namespace Content.Server.Tools.Components
                     .TryGetDrainableSolution(eventArgs.Target.Uid, out var targetSolution)
                 && WelderSolution != null)
             {
-                if (WelderLit && targetSolution.DrainAvailable > 0)
-                {
-                    // Oh no no
-                    eventArgs.Target.SpawnExplosion();
-                    return true;
-                }
-
                 var trans = ReagentUnit.Min(WelderSolution.AvailableVolume, targetSolution.DrainAvailable);
                 if (trans > 0)
                 {