add igniter (#20962)

Co-authored-by: deltanedas <@deltanedas:kde.org>

Content.Server/IgnitionSource/IgniteOnTriggerSystem.cs

@@ -0,0 +1,55 @@
+using Content.Server.Explosion.EntitySystems;
+using Content.Shared.Timing;
+using Robust.Shared.Audio;
+using Robust.Shared.Timing;
+
+namespace Content.Server.IgnitionSource;
+
+/// <summary>
+/// Handles igniting when triggered and stopping ignition after the delay.
+/// </summary>
+public sealed class IgniteOnTriggerSystem : EntitySystem
+{
+    [Dependency] private readonly IGameTiming _timing = default!;
+    [Dependency] private readonly IgnitionSourceSystem _source = default!;
+    [Dependency] private readonly SharedAudioSystem _audio = default!;
+    [Dependency] private readonly UseDelaySystem _useDelay = default!;
+
+    public override void Initialize()
+    {
+        base.Initialize();
+
+        SubscribeLocalEvent<IgniteOnTriggerComponent, TriggerEvent>(OnTrigger);
+    }
+
+    public override void Update(float deltaTime)
+    {
+        base.Update(deltaTime);
+
+        var query = EntityQueryEnumerator<IgniteOnTriggerComponent, IgnitionSourceComponent>();
+        while (query.MoveNext(out var uid, out var comp, out var source))
+        {
+            if (!source.Ignited)
+                continue;
+
+            if (_timing.CurTime < comp.IgnitedUntil)
+                continue;
+
+            _source.SetIgnited(uid, false, source);
+        }
+    }
+
+    private void OnTrigger(EntityUid uid, IgniteOnTriggerComponent comp, TriggerEvent args)
+    {
+        // prevent spamming sound and ignition
+        TryComp<UseDelayComponent>(uid, out var delay);
+        if (_useDelay.ActiveDelay(uid, delay))
+            return;
+
+        _source.SetIgnited(uid);
+        _audio.PlayPvs(comp.IgniteSound, uid);
+
+        _useDelay.BeginDelay(uid, delay);
+        comp.IgnitedUntil = _timing.CurTime + comp.IgnitedTime;
+    }
+}