Client customization late-join spawner priority for arrivals/cryostorage (#24586)

* Initial commit, requires server restart to take effect

* Exposes callbacks directly instead, takes effect immediately

* Cleaned up control flow, swapped cvar for client customization

* Switched to int, dictionary of callbacks, migration

* Update Content.Shared/Preferences/SpawnPriorityPreference.cs

* krunkle stan

---------

Co-authored-by: metalgearsloth <31366439+metalgearsloth@users.noreply.github.com>
Co-authored-by: metalgearsloth <comedian_vs_clown@hotmail.com>

Content.Client/Preferences/UI/HumanoidProfileEditor.xaml

@@ -96,6 +96,12 @@
                                     <Control HorizontalExpand="True"/>
                                     <OptionButton Name="CBackpackButton" HorizontalAlignment="Right" />
                                 </BoxContainer>
+                                <!-- Spawn Priority -->
+                                <BoxContainer HorizontalExpand="True">
+                                    <Label Text="{Loc 'humanoid-profile-editor-spawn-priority-label'}" />
+                                    <Control HorizontalExpand="True"/>
+                                    <OptionButton Name="CSpawnPriorityButton" HorizontalAlignment="Right" />
+                                </BoxContainer>
                             </BoxContainer>
                             <!-- Skin -->
                             <BoxContainer Margin="10" HorizontalExpand="True" Orientation="Vertical">

Content.Client/Preferences/UI/HumanoidProfileEditor.xaml.cs

@@ -72,6 +72,7 @@ namespace Content.Client.Preferences.UI
         private Slider _skinColor => CSkin;
         private OptionButton _clothingButton => CClothingButton;
         private OptionButton _backpackButton => CBackpackButton;
+        private OptionButton _spawnPriorityButton => CSpawnPriorityButton;
         private SingleMarkingPicker _hairPicker => CHairStylePicker;
         private SingleMarkingPicker _facialHairPicker => CFacialHairPicker;
         private EyeColorPicker _eyesPicker => CEyeColorPicker;
@@ -340,6 +341,21 @@ namespace Content.Client.Preferences.UI
 
             #endregion Backpack
 
+            #region SpawnPriority
+
+            foreach (var value in Enum.GetValues<SpawnPriorityPreference>())
+            {
+                _spawnPriorityButton.AddItem(Loc.GetString($"humanoid-profile-editor-preference-spawn-priority-{value.ToString().ToLower()}"), (int) value);
+            }
+
+            _spawnPriorityButton.OnItemSelected += args =>
+            {
+                _spawnPriorityButton.SelectId(args.Id);
+                SetSpawnPriority((SpawnPriorityPreference) args.Id);
+            };
+
+            #endregion SpawnPriority
+
             #region Eyes
 
             _eyesPicker.OnEyeColorPicked += newColor =>
@@ -799,6 +815,12 @@ namespace Content.Client.Preferences.UI
             IsDirty = true;
         }
 
+        private void SetSpawnPriority(SpawnPriorityPreference newSpawnPriority)
+        {
+            Profile = Profile?.WithSpawnPriorityPreference(newSpawnPriority);
+            IsDirty = true;
+        }
+
         public void Save()
         {
             IsDirty = false;
@@ -974,6 +996,16 @@ namespace Content.Client.Preferences.UI
             _backpackButton.SelectId((int) Profile.Backpack);
         }
 
+        private void UpdateSpawnPriorityControls()
+        {
+            if (Profile == null)
+            {
+                return;
+            }
+
+            _spawnPriorityButton.SelectId((int) Profile.SpawnPriority);
+        }
+
         private void UpdateHairPickers()
         {
             if (Profile == null)
@@ -1113,6 +1145,7 @@ namespace Content.Client.Preferences.UI
             UpdateSpecies();
             UpdateClothingControls();
             UpdateBackpackControls();
+            UpdateSpawnPriorityControls();
             UpdateAgeEdit();
             UpdateEyePickers();
             UpdateSaveButton();

Content.IntegrationTests/Tests/Preferences/ServerDbSqliteTests.cs

@@ -56,6 +56,7 @@ namespace Content.IntegrationTests.Tests.Preferences
                 ),
                 ClothingPreference.Jumpskirt,
                 BackpackPreference.Backpack,
+                SpawnPriorityPreference.Arrivals,
                 new Dictionary<string, JobPriority>
                 {
                     {SharedGameTicker.FallbackOverflowJob, JobPriority.High}

Content.Server.Database/Migrations/Postgres/20240201091301_SpawnPriorityPreference.cs

@@ -0,0 +1,29 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace Content.Server.Database.Migrations.Postgres
+{
+    /// <inheritdoc />
+    public partial class SpawnPriorityPreference : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<int>(
+                name: "spawn_priority",
+                table: "profile",
+                type: "integer",
+                nullable: false,
+                defaultValue: 0);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "spawn_priority",
+                table: "profile");
+        }
+    }
+}

Content.Server.Database/Migrations/Postgres/PostgresServerDbContextModelSnapshot.cs

@@ -7,6 +7,7 @@ using Microsoft.EntityFrameworkCore;
 using Microsoft.EntityFrameworkCore.Infrastructure;
 using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
 using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
+using NpgsqlTypes;
 
 #nullable disable
 
@@ -19,7 +20,7 @@ namespace Content.Server.Database.Migrations.Postgres
         {
 #pragma warning disable 612, 618
             modelBuilder
-                .HasAnnotation("ProductVersion", "7.0.4")
+                .HasAnnotation("ProductVersion", "8.0.0")
                 .HasAnnotation("Relational:MaxIdentifierLength", 63);
 
             NpgsqlModelBuilderExtensions.UseIdentityByDefaultColumns(modelBuilder);
@@ -803,6 +804,10 @@ namespace Content.Server.Database.Migrations.Postgres
                         .HasColumnType("integer")
                         .HasColumnName("slot");
 
+                    b.Property<int>("SpawnPriority")
+                        .HasColumnType("integer")
+                        .HasColumnName("spawn_priority");
+
                     b.Property<string>("Species")
                         .IsRequired()
                         .HasColumnType("text")
@@ -879,7 +884,7 @@ namespace Content.Server.Database.Migrations.Postgres
 
                     NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("Id"));
 
-                    b.Property<ValueTuple<IPAddress, int>?>("Address")
+                    b.Property<NpgsqlInet?>("Address")
                         .HasColumnType("inet")
                         .HasColumnName("address");
 
@@ -1021,7 +1026,7 @@ namespace Content.Server.Database.Migrations.Postgres
 
                     NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("Id"));
 
-                    b.Property<ValueTuple<IPAddress, int>?>("Address")
+                    b.Property<NpgsqlInet?>("Address")
                         .HasColumnType("inet")
                         .HasColumnName("address");
 

Content.Server.Database/Migrations/Sqlite/20240201091254_SpawnPriorityPreference.cs

@@ -0,0 +1,29 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace Content.Server.Database.Migrations.Sqlite
+{
+    /// <inheritdoc />
+    public partial class SpawnPriorityPreference : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<int>(
+                name: "spawn_priority",
+                table: "profile",
+                type: "INTEGER",
+                nullable: false,
+                defaultValue: 0);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "spawn_priority",
+                table: "profile");
+        }
+    }
+}

Content.Server.Database/Migrations/Sqlite/SqliteServerDbContextModelSnapshot.cs

@@ -15,7 +15,7 @@ namespace Content.Server.Database.Migrations.Sqlite
         protected override void BuildModel(ModelBuilder modelBuilder)
         {
 #pragma warning disable 612, 618
-            modelBuilder.HasAnnotation("ProductVersion", "7.0.4");
+            modelBuilder.HasAnnotation("ProductVersion", "8.0.0");
 
             modelBuilder.Entity("Content.Server.Database.Admin", b =>
                 {
@@ -757,6 +757,10 @@ namespace Content.Server.Database.Migrations.Sqlite
                         .HasColumnType("INTEGER")
                         .HasColumnName("slot");
 
+                    b.Property<int>("SpawnPriority")
+                        .HasColumnType("INTEGER")
+                        .HasColumnName("spawn_priority");
+
                     b.Property<string>("Species")
                         .IsRequired()
                         .HasColumnType("TEXT")

Content.Server.Database/Model.cs

@@ -338,6 +338,7 @@ namespace Content.Server.Database
         public string SkinColor { get; set; } = null!;
         public string Clothing { get; set; } = null!;
         public string Backpack { get; set; } = null!;
+        public int SpawnPriority { get; set; } = 0;
         public List<Job> Jobs { get; } = new();
         public List<Antag> Antags { get; } = new();
         public List<Trait> Traits { get; } = new();

Content.Server/Database/ServerDbBase.cs

@@ -186,6 +186,8 @@ namespace Content.Server.Database
             if (Enum.TryParse<BackpackPreference>(profile.Backpack, true, out var backpackVal))
                 backpack = backpackVal;
 
+            var spawnPriority = (SpawnPriorityPreference) profile.SpawnPriority;
+
             var gender = sex == Sex.Male ? Gender.Male : Gender.Female;
             if (Enum.TryParse<Gender>(profile.Gender, true, out var genderVal))
                 gender = genderVal;
@@ -225,6 +227,7 @@ namespace Content.Server.Database
                 ),
                 clothing,
                 backpack,
+                spawnPriority,
                 jobs,
                 (PreferenceUnavailableMode) profile.PreferenceUnavailable,
                 antags.ToList(),

Content.Server/Shuttles/Systems/ArrivalsSystem.cs

@@ -12,7 +12,6 @@ using Content.Server.Screens.Components;
 using Content.Server.Shuttles.Components;
 using Content.Server.Shuttles.Events;
 using Content.Server.Spawners.Components;
-using Content.Server.Spawners.EntitySystems;
 using Content.Server.Station.Components;
 using Content.Server.Station.Systems;
 using Content.Shared.Administration;
@@ -82,7 +81,6 @@ public sealed class ArrivalsSystem : EntitySystem
     {
         base.Initialize();
 
-        SubscribeLocalEvent<PlayerSpawningEvent>(OnPlayerSpawn, before: new[] { typeof(SpawnPointSystem), typeof(ContainerSpawnPointSystem) });
         SubscribeLocalEvent<StationArrivalsComponent, ComponentStartup>(OnArrivalsStartup);
 
         SubscribeLocalEvent<ArrivalsShuttleComponent, ComponentStartup>(OnShuttleStartup);
@@ -314,7 +312,7 @@ public sealed class ArrivalsSystem : EntitySystem
         }
     }
 
-    private void OnPlayerSpawn(PlayerSpawningEvent ev)
+    public void HandlePlayerSpawning(PlayerSpawningEvent ev)
     {
         if (ev.SpawnResult != null)
             return;

Content.Server/Spawners/EntitySystems/ContainerSpawnPointSystem.cs

@@ -1,5 +1,4 @@
 using Content.Server.GameTicking;
-using Content.Server.Shuttles.Systems;
 using Content.Server.Spawners.Components;
 using Content.Server.Station.Systems;
 using Robust.Server.Containers;
@@ -16,12 +15,7 @@ public sealed class ContainerSpawnPointSystem : EntitySystem
     [Dependency] private readonly StationSystem _station = default!;
     [Dependency] private readonly StationSpawningSystem _stationSpawning = default!;
 
-    public override void Initialize()
+    public void HandlePlayerSpawning(PlayerSpawningEvent args)
-    {
-        SubscribeLocalEvent<PlayerSpawningEvent>(OnSpawnPlayer, before: new[] { typeof(SpawnPointSystem) }, after: new[] { typeof(ArrivalsSystem) });
-    }
-
-    private void OnSpawnPlayer(PlayerSpawningEvent args)
     {
         if (args.SpawnResult != null)
             return;

Content.Server/Spawners/EntitySystems/SpawnPointSystem.cs

@@ -1,5 +1,4 @@
 using Content.Server.GameTicking;
-using Content.Server.Shuttles.Systems;
 using Content.Server.Spawners.Components;
 using Content.Server.Station.Systems;
 using Robust.Shared.Map;
@@ -16,10 +15,10 @@ public sealed class SpawnPointSystem : EntitySystem
 
     public override void Initialize()
     {
-        SubscribeLocalEvent<PlayerSpawningEvent>(OnSpawnPlayer, after: new[] { typeof(ContainerSpawnPointSystem), typeof(ArrivalsSystem) });
+        SubscribeLocalEvent<PlayerSpawningEvent>(OnPlayerSpawning);
     }
 
-    private void OnSpawnPlayer(PlayerSpawningEvent args)
+    private void OnPlayerSpawning(PlayerSpawningEvent args)
     {
         if (args.SpawnResult != null)
             return;

Content.Server/Station/Systems/StationSpawningSystem.cs

@@ -4,6 +4,8 @@ using Content.Server.Humanoid;
 using Content.Server.IdentityManagement;
 using Content.Server.Mind.Commands;
 using Content.Server.PDA;
+using Content.Server.Shuttles.Systems;
+using Content.Server.Spawners.EntitySystems;
 using Content.Server.Station.Components;
 using Content.Shared.Access.Components;
 using Content.Shared.Access.Systems;
@@ -44,12 +46,23 @@ public sealed class StationSpawningSystem : SharedStationSpawningSystem
     [Dependency] private readonly IdentitySystem _identity = default!;
     [Dependency] private readonly MetaDataSystem _metaSystem = default!;
 
+    [Dependency] private readonly ArrivalsSystem _arrivalsSystem = default!;
+    [Dependency] private readonly ContainerSpawnPointSystem _containerSpawnPointSystem = default!;
+
     private bool _randomizeCharacters;
 
+    private Dictionary<SpawnPriorityPreference, Action<PlayerSpawningEvent>> _spawnerCallbacks = new();
+
     /// <inheritdoc/>
     public override void Initialize()
     {
         _configurationManager.OnValueChanged(CCVars.ICRandomCharacters, e => _randomizeCharacters = e, true);
+
+        _spawnerCallbacks = new Dictionary<SpawnPriorityPreference, Action<PlayerSpawningEvent>>()
+        {
+            { SpawnPriorityPreference.Arrivals, _arrivalsSystem.HandlePlayerSpawning },
+            { SpawnPriorityPreference.Cryosleep, _containerSpawnPointSystem.HandlePlayerSpawning }
+        };
     }
 
     /// <summary>
@@ -70,6 +83,30 @@ public sealed class StationSpawningSystem : SharedStationSpawningSystem
             throw new ArgumentException("Tried to use a non-station entity as a station!", nameof(station));
 
         var ev = new PlayerSpawningEvent(job, profile, station);
+
+        if (station != null && profile != null)
+        {
+            /// Try to call the character's preferred spawner first.
+            if (_spawnerCallbacks.TryGetValue(profile.SpawnPriority, out var preferredSpawner))
+            {
+                preferredSpawner(ev);
+
+                foreach (var (key, remainingSpawner) in _spawnerCallbacks)
+                {
+                    if (key == profile.SpawnPriority)
+                        continue;
+
+                    remainingSpawner(ev);
+                }
+            }
+            else
+            {
+                /// Call all of them in the typical order.
+                foreach (var typicalSpawner in _spawnerCallbacks.Values)
+                    typicalSpawner(ev);
+            }
+        }
+
         RaiseLocalEvent(ev);
 
         DebugTools.Assert(ev.SpawnResult is { Valid: true } or null);

Content.Shared/Preferences/HumanoidCharacterProfile.cs

@@ -41,6 +41,7 @@ namespace Content.Shared.Preferences
             HumanoidCharacterAppearance appearance,
             ClothingPreference clothing,
             BackpackPreference backpack,
+            SpawnPriorityPreference spawnPriority,
             Dictionary<string, JobPriority> jobPriorities,
             PreferenceUnavailableMode preferenceUnavailable,
             List<string> antagPreferences,
@@ -55,6 +56,7 @@ namespace Content.Shared.Preferences
             Appearance = appearance;
             Clothing = clothing;
             Backpack = backpack;
+            SpawnPriority = spawnPriority;
             _jobPriorities = jobPriorities;
             PreferenceUnavailable = preferenceUnavailable;
             _antagPreferences = antagPreferences;
@@ -67,7 +69,7 @@ namespace Content.Shared.Preferences
             Dictionary<string, JobPriority> jobPriorities,
             List<string> antagPreferences,
             List<string> traitPreferences)
-            : this(other.Name, other.FlavorText, other.Species, other.Age, other.Sex, other.Gender, other.Appearance, other.Clothing, other.Backpack,
+            : this(other.Name, other.FlavorText, other.Species, other.Age, other.Sex, other.Gender, other.Appearance, other.Clothing, other.Backpack, other.SpawnPriority,
                 jobPriorities, other.PreferenceUnavailable, antagPreferences, traitPreferences)
         {
         }
@@ -88,11 +90,12 @@ namespace Content.Shared.Preferences
             HumanoidCharacterAppearance appearance,
             ClothingPreference clothing,
             BackpackPreference backpack,
+            SpawnPriorityPreference spawnPriority,
             IReadOnlyDictionary<string, JobPriority> jobPriorities,
             PreferenceUnavailableMode preferenceUnavailable,
             IReadOnlyList<string> antagPreferences,
             IReadOnlyList<string> traitPreferences)
-            : this(name, flavortext, species, age, sex, gender, appearance, clothing, backpack, new Dictionary<string, JobPriority>(jobPriorities),
+            : this(name, flavortext, species, age, sex, gender, appearance, clothing, backpack, spawnPriority, new Dictionary<string, JobPriority>(jobPriorities),
                 preferenceUnavailable, new List<string>(antagPreferences), new List<string>(traitPreferences))
         {
         }
@@ -112,6 +115,7 @@ namespace Content.Shared.Preferences
             new HumanoidCharacterAppearance(),
             ClothingPreference.Jumpsuit,
             BackpackPreference.Backpack,
+            SpawnPriorityPreference.Arrivals,
             new Dictionary<string, JobPriority>
             {
                 {SharedGameTicker.FallbackOverflowJob, JobPriority.High}
@@ -139,6 +143,7 @@ namespace Content.Shared.Preferences
                 HumanoidCharacterAppearance.DefaultWithSpecies(species),
                 ClothingPreference.Jumpsuit,
                 BackpackPreference.Backpack,
+                SpawnPriorityPreference.Arrivals,
                 new Dictionary<string, JobPriority>
                 {
                     {SharedGameTicker.FallbackOverflowJob, JobPriority.High}
@@ -180,7 +185,7 @@ namespace Content.Shared.Preferences
 
             var name = GetName(species, gender);
 
-            return new HumanoidCharacterProfile(name, "", species, age, sex, gender, HumanoidCharacterAppearance.Random(species, sex), ClothingPreference.Jumpsuit, BackpackPreference.Backpack,
+            return new HumanoidCharacterProfile(name, "", species, age, sex, gender, HumanoidCharacterAppearance.Random(species, sex), ClothingPreference.Jumpsuit, BackpackPreference.Backpack, SpawnPriorityPreference.Arrivals,
                 new Dictionary<string, JobPriority>
                 {
                     {SharedGameTicker.FallbackOverflowJob, JobPriority.High},
@@ -206,6 +211,7 @@ namespace Content.Shared.Preferences
         public HumanoidCharacterAppearance Appearance { get; private set; }
         public ClothingPreference Clothing { get; private set; }
         public BackpackPreference Backpack { get; private set; }
+        public SpawnPriorityPreference SpawnPriority { get; private set; }
         public IReadOnlyDictionary<string, JobPriority> JobPriorities => _jobPriorities;
         public IReadOnlyList<string> AntagPreferences => _antagPreferences;
         public IReadOnlyList<string> TraitPreferences => _traitPreferences;
@@ -255,6 +261,10 @@ namespace Content.Shared.Preferences
         {
             return new(this) { Backpack = backpack };
         }
+        public HumanoidCharacterProfile WithSpawnPriorityPreference(SpawnPriorityPreference spawnPriority)
+        {
+            return new(this) { SpawnPriority = spawnPriority };
+        }
         public HumanoidCharacterProfile WithJobPriorities(IEnumerable<KeyValuePair<string, JobPriority>> jobPriorities)
         {
             return new(this, new Dictionary<string, JobPriority>(jobPriorities), _antagPreferences, _traitPreferences);
@@ -344,6 +354,7 @@ namespace Content.Shared.Preferences
             if (PreferenceUnavailable != other.PreferenceUnavailable) return false;
             if (Clothing != other.Clothing) return false;
             if (Backpack != other.Backpack) return false;
+            if (SpawnPriority != other.SpawnPriority) return false;
             if (!_jobPriorities.SequenceEqual(other._jobPriorities)) return false;
             if (!_antagPreferences.SequenceEqual(other._antagPreferences)) return false;
             if (!_traitPreferences.SequenceEqual(other._traitPreferences)) return false;
@@ -457,6 +468,13 @@ namespace Content.Shared.Preferences
                 _ => BackpackPreference.Backpack // Invalid enum values.
             };
 
+            var spawnPriority = SpawnPriority switch
+            {
+                SpawnPriorityPreference.Arrivals => SpawnPriorityPreference.Arrivals,
+                SpawnPriorityPreference.Cryosleep => SpawnPriorityPreference.Cryosleep,
+                _ => SpawnPriorityPreference.Arrivals // Invalid enum values.
+            };
+
             var priorities = new Dictionary<string, JobPriority>(JobPriorities
                 .Where(p => prototypeManager.HasIndex<JobPrototype>(p.Key) && p.Value switch
                 {
@@ -483,6 +501,7 @@ namespace Content.Shared.Preferences
             Appearance = appearance;
             Clothing = clothing;
             Backpack = backpack;
+            SpawnPriority = spawnPriority;
 
             _jobPriorities.Clear();
 
@@ -526,6 +545,7 @@ namespace Content.Shared.Preferences
                     Clothing,
                     Backpack
                 ),
+                SpawnPriority,
                 PreferenceUnavailable,
                 _jobPriorities,
                 _antagPreferences,

Content.Shared/Preferences/SpawnPriorityPreference.cs

@@ -0,0 +1,15 @@
+namespace Content.Shared.Preferences
+{
+    /// <summary>
+    /// The spawn priority preference for a profile. Stored in database!
+    /// </summary>
+    public enum SpawnPriorityPreference
+    {
+        ///////////////////////
+        /// DO NOT TOUCH!!! ///
+        ///////////////////////
+        None = 0,
+        Arrivals = 1,
+        Cryosleep = 2,
+    }
+}

Resources/Locale/en-US/preferences/ui/humanoid-profile-editor.ftl

@@ -21,6 +21,7 @@ humanoid-profile-editor-export-button = Export
 humanoid-profile-editor-save-button = Save
 humanoid-profile-editor-clothing-label = Clothing:
 humanoid-profile-editor-backpack-label = Backpack:
+humanoid-profile-editor-spawn-priority-label = Spawn priority:
 humanoid-profile-editor-eyes-label = Eye color:
 humanoid-profile-editor-jobs-tab = Jobs
 humanoid-profile-editor-preference-unavailable-stay-in-lobby-button = Stay in lobby if preference unavailable.
@@ -30,6 +31,12 @@ humanoid-profile-editor-preference-jumpskirt = Jumpskirt
 humanoid-profile-editor-preference-backpack = Backpack
 humanoid-profile-editor-preference-satchel = Satchel
 humanoid-profile-editor-preference-duffelbag = Duffelbag
+
+# Spawn priority
+humanoid-profile-editor-preference-spawn-priority-none = None
+humanoid-profile-editor-preference-spawn-priority-arrivals = Arrivals
+humanoid-profile-editor-preference-spawn-priority-cryosleep = Cryosleep
+
 humanoid-profile-editor-jobs-amount-in-department-tooltip = Jobs in the {$departmentName} department
 humanoid-profile-editor-department-jobs-label = {$departmentName} jobs
 humanoid-profile-editor-antags-tab = Antags