Add EmoteOnDamage comp/system for zombies (#14371)

Content.Server/Chat/Systems/EmoteOnDamageSystem.cs

@@ -0,0 +1,82 @@
+namespace Content.Server.Chat.Systems;
+
+using Content.Shared.Chat.Prototypes;
+using Content.Shared.Damage;
+using Robust.Shared.Prototypes;
+using Robust.Shared.Random;
+using Robust.Shared.Timing;
+using Robust.Shared.Utility;
+
+public sealed class EmoteOnDamageSystem : EntitySystem
+{
+    [Dependency] private readonly IGameTiming _gameTiming = default!;
+    [Dependency] private readonly IPrototypeManager _prototypeManager = default!;
+    [Dependency] private readonly IRobustRandom _random = default!;
+    [Dependency] private readonly ChatSystem _chatSystem = default!;
+
+    public override void Initialize()
+    {
+        base.Initialize();
+
+        SubscribeLocalEvent<EmoteOnDamageComponent, EntityUnpausedEvent>(OnUnpaused);
+        SubscribeLocalEvent<EmoteOnDamageComponent, DamageChangedEvent>(OnDamage);
+    }
+
+    private void OnUnpaused(EntityUid uid, EmoteOnDamageComponent emoteOnDamage, ref EntityUnpausedEvent args)
+    {
+        emoteOnDamage.LastEmoteTime += args.PausedTime;
+    }
+
+    private void OnDamage(EntityUid uid, EmoteOnDamageComponent emoteOnDamage, DamageChangedEvent args)
+    {
+        if (!args.DamageIncreased)
+            return;
+
+        if (emoteOnDamage.LastEmoteTime + emoteOnDamage.EmoteCooldown > _gameTiming.CurTime)
+            return;
+
+        if (emoteOnDamage.Emotes.Count == 0)
+            return;
+
+        if (!_random.Prob(emoteOnDamage.EmoteChance))
+            return;
+
+        var emote = _random.Pick(emoteOnDamage.Emotes);
+        if (emoteOnDamage.WithChat)
+        {
+            _chatSystem.TryEmoteWithChat(uid, emote, emoteOnDamage.HiddenFromChatWindow);
+        }
+        else
+        {
+            _chatSystem.TryEmoteWithoutChat(uid,emote);
+        }
+
+        emoteOnDamage.LastEmoteTime = _gameTiming.CurTime;
+    }
+
+    /// <summary>
+    /// Try to add an emote to the entity, which will be performed at an interval.
+    /// </summary>
+    public bool AddEmote(EntityUid uid, string emotePrototypeId, EmoteOnDamageComponent? emoteOnDamage = null)
+    {
+        if (!Resolve(uid, ref emoteOnDamage, logMissing: false))
+            return false;
+
+        DebugTools.Assert(_prototypeManager.HasIndex<EmotePrototype>(emotePrototypeId), "Prototype not found. Did you make a typo?");
+
+        return emoteOnDamage.Emotes.Add(emotePrototypeId);
+    }
+
+    /// <summary>
+    /// Stop preforming an emote.
+    /// </summary>
+    public bool RemoveEmote(EntityUid uid, string emotePrototypeId, EmoteOnDamageComponent? emoteOnDamage = null)
+    {
+        if (!Resolve(uid, ref emoteOnDamage, logMissing: false))
+            return false;
+
+        DebugTools.Assert(_prototypeManager.HasIndex<EmotePrototype>(emotePrototypeId), "Prototype not found. Did you make a typo?");
+
+        return emoteOnDamage.Emotes.Remove(emotePrototypeId);
+    }
+}