Projectile spells + fireball spell (#9058)

* Projectile spells + fireball spell

* say it with some gumption

Content.Server/Magic/Events/ProjectileSpellEvent.cs

@@ -0,0 +1,20 @@
+using Content.Shared.Actions;
+using Content.Shared.Sound;
+using Robust.Shared.Prototypes;
+using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom.Prototype;
+
+namespace Content.Server.Magic.Events;
+
+public sealed class ProjectileSpellEvent : WorldTargetActionEvent
+{
+    /// <summary>
+    /// What entity should be spawned.
+    /// </summary>
+    [DataField("prototype", required: true, customTypeSerializer: typeof(PrototypeIdSerializer<EntityPrototype>))]
+    public string Prototype = default!;
+
+    /// <summary>
+    /// Gets the targeted spawn positions; may lead to multiple entities being spawned.
+    /// </summary>
+    [DataField("posData")] public MagicSpawnData Pos = new TargetCasterPos();
+}

Content.Server/Magic/MagicSystem.cs

@@ -4,7 +4,9 @@ using Content.Server.Decals;
 using Content.Server.DoAfter;
 using Content.Server.Doors.Components;
 using Content.Server.Magic.Events;
+using Content.Server.Popups;
 using Content.Server.Spawners.Components;
+using Content.Server.Weapon.Ranged.Systems;
 using Content.Shared.Actions;
 using Content.Shared.Actions.ActionTypes;
 using Content.Shared.Doors.Components;
@@ -33,6 +35,7 @@ public sealed class MagicSystem : EntitySystem
     [Dependency] private readonly SharedDoorSystem _doorSystem = default!;
     [Dependency] private readonly SharedActionsSystem _actionsSystem = default!;
     [Dependency] private readonly DoAfterSystem _doAfter = default!;
+    [Dependency] private readonly GunSystem _gunSystem = default!;
 
     public override void Initialize()
     {
@@ -47,7 +50,7 @@ public sealed class MagicSystem : EntitySystem
         SubscribeLocalEvent<TeleportSpellEvent>(OnTeleportSpell);
         SubscribeLocalEvent<KnockSpellEvent>(OnKnockSpell);
         SubscribeLocalEvent<WorldSpawnSpellEvent>(OnWorldSpawn);
-
+        SubscribeLocalEvent<ProjectileSpellEvent>(OnProjectileSpell);
     }
 
     private void OnInit(EntityUid uid, SpellbookComponent component, ComponentInit args)
@@ -142,6 +145,20 @@ public sealed class MagicSystem : EntitySystem
         args.Handled = true;
     }
 
+    private void OnProjectileSpell(ProjectileSpellEvent ev)
+    {
+        if (ev.Handled)
+            return;
+
+        var xform = Transform(ev.Performer);
+
+        foreach (var pos in GetSpawnPositions(xform, ev.Pos))
+        {
+            var ent = Spawn(ev.Prototype, pos.SnapToGrid(EntityManager, _mapManager));
+            _gunSystem.ShootProjectile(ent,ev.Target.Position - Transform(ent).MapPosition.Position, ev.Performer);
+        }
+    }
+
     private List<EntityCoordinates> GetSpawnPositions(TransformComponent casterXform, MagicSpawnData data)
     {
         switch (data)

Content.Server/Weapon/Ranged/Systems/GunSystem.cs

@@ -154,7 +154,7 @@ public sealed partial class GunSystem : SharedGunSystem
         }, false);
     }
 
-    private void ShootProjectile(EntityUid uid, Vector2 direction, EntityUid? user = null)
+    public void ShootProjectile(EntityUid uid, Vector2 direction, EntityUid? user = null)
     {
         var physics = EnsureComp<PhysicsComponent>(uid);
         physics.BodyStatus = BodyStatus.InAir;