Add EmoteOnDamage comp/system for zombies (#14371)

Content.Server/Chat/EmoteOnDamageComponent.cs

@@ -0,0 +1,51 @@
+namespace Content.Server.Chat;
+
+using Content.Server.Chat.Systems;
+using Content.Shared.Chat.Prototypes;
+using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom;
+using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom.Prototype.Set;
+
+/// <summary>
+/// Causes an entity to automatically emote when taking damage.
+/// </summary>
+[RegisterComponent, Access(typeof(EmoteOnDamageSystem))]
+public sealed class EmoteOnDamageComponent : Component
+{
+    /// <summary>
+    /// Chance of preforming an emote when taking damage and not on cooldown.
+    /// </summary>
+    [DataField("emoteChance"), ViewVariables(VVAccess.ReadWrite)]
+    public float EmoteChance = 0.5f;
+
+    /// <summary>
+    /// A set of emotes that will be randomly picked from.
+    /// <see cref="EmotePrototype"/>
+    /// </summary>
+    [DataField("emotes", customTypeSerializer: typeof(PrototypeIdHashSetSerializer<EmotePrototype>)), ViewVariables(VVAccess.ReadWrite)]
+    public HashSet<string> Emotes = new();
+
+    /// <summary>
+    /// Also send the emote in chat.
+    /// <summary>
+    [DataField("withChat"), ViewVariables(VVAccess.ReadWrite)]
+    public bool WithChat = false;
+
+    /// <summary>
+    /// Hide the chat message from the chat window, only showing the popup.
+    /// This does nothing if WithChat is false.
+    /// <summary>
+    [DataField("hiddenFromChatWindow")]
+    public bool HiddenFromChatWindow = false;
+
+    /// <summary>
+    /// The simulation time of the last emote preformed due to taking damage.
+    /// </summary>
+    [DataField("lastEmoteTime", customTypeSerializer: typeof(TimeOffsetSerializer)), ViewVariables(VVAccess.ReadWrite)]
+    public TimeSpan LastEmoteTime = TimeSpan.Zero;
+
+    /// <summary>
+    /// The cooldown between emotes.
+    /// </summary>
+    [DataField("emoteCooldown"), ViewVariables(VVAccess.ReadWrite)]
+    public TimeSpan EmoteCooldown = TimeSpan.FromSeconds(2);
+}