[Port] BackStab / Удар В Спину (#30)

* add: BackStab

* test

Content.Shared/_White/BackStab/BackStabComponent.cs

@@ -0,0 +1,11 @@
+namespace Content.Shared._White.BackStab;
+
+[RegisterComponent]
+public sealed partial class BackStabComponent : Component
+{
+    [DataField, ViewVariables(VVAccess.ReadWrite)]
+    public float DamageMultiplier = 2f;
+
+    [DataField, ViewVariables(VVAccess.ReadWrite)]
+    public Angle Tolerance = Angle.FromDegrees(45d);
+}

Content.Shared/_White/BackStab/BackStabSystem.cs

@@ -0,0 +1,58 @@
+using Content.Shared.Damage;
+using Content.Shared.Damage.Prototypes;
+using Content.Shared.Mobs.Components;
+using Content.Shared.Popups;
+using Content.Shared.Weapons.Melee.Events;
+using Robust.Shared.Network;
+using Robust.Shared.Prototypes;
+
+namespace Content.Shared._White.BackStab;
+
+public sealed class BackStabSystem : EntitySystem
+{
+    [Dependency] private readonly IPrototypeManager _prototypeManager = default!;
+    [Dependency] private readonly INetManager _net = default!;
+    [Dependency] private readonly SharedTransformSystem _transform = default!;
+    [Dependency] private readonly SharedPopupSystem _popup = default!;
+
+    public override void Initialize()
+    {
+        base.Initialize();
+
+        SubscribeLocalEvent<BackStabComponent, MeleeHitEvent>(HandleHit);
+    }
+
+    private void HandleHit(Entity<BackStabComponent> ent, ref MeleeHitEvent args)
+    {
+        if (args.HitEntities.Count != 1)
+            return;
+
+        var target = args.HitEntities[0];
+
+        if (target == args.User
+            || !HasComp<MobStateComponent>(target)
+            || !TryComp(target, out TransformComponent? xform))
+        {
+            return;
+        }
+
+        var userXform = Transform(args.User);
+        var v1 = (_transform.GetWorldRotation(xform) + MathHelper.PiOver2).ToVec(); // Flipped WorldVec
+        var v2 = _transform.GetWorldPosition(userXform) - _transform.GetWorldPosition(xform);
+        var angle = Vector3.CalculateAngle(new Vector3(v1), new Vector3(v2));
+
+        if (angle > ent.Comp.Tolerance.Theta)
+            return;
+
+        var damage = args.BaseDamage.GetTotal() * ent.Comp.DamageMultiplier;
+
+        args.BonusDamage = new DamageSpecifier(_prototypeManager.Index<DamageTypePrototype>("Slash"),
+            damage - args.BaseDamage.GetTotal());
+
+        if (!_net.IsServer)
+            return;
+
+        var message = Loc.GetString("backstab-damage-betrayal-dagger", ("damage", damage));
+        _popup.PopupEntity(message, args.User, args.User, PopupType.MediumCaution);
+    }
+}

Resources/Locale/en-US/_white/backstab/backstab.ftl

@@ -0,0 +1 @@
+backstab-damage-betrayal-dagger = A stab in the back: {$damage}!

Resources/Locale/en-US/_white/store/uplink-catalog.ftl

@@ -1,2 +1,5 @@
 uplink-emp-flashlight-name = Emp Flashlight
 uplink-emp-flashlight-desc = A rechargeable device disguised as a flashlight designed to disrupt electronic systems. Useful for disrupting communications, security's energy weapons, and APCs when you're in a tight spot.
+
+uplink-betrayal-knife-name = Betrayal dagger
+uplink-betrayal-knife-desc = The betrayal dagger allows the user to teleport a short distance, and also causes significant damage when stabbed in the back.

Resources/Locale/ru-RU/_white/backstab/backstab.ftl

@@ -0,0 +1 @@
+backstab-damage-betrayal-dagger = Удар в спину: {$damage}!

Resources/Locale/ru-RU/_white/store/uplink-catalog.ftl

@@ -1,2 +1,5 @@
 uplink-emp-flashlight-name = Электромагнитный фонарик
 uplink-emp-flashlight-desc = Замаскированное под фонарик устройство. При ударе выпускает ЭМИ, поражающий электрические устройства.
+
+uplink-betrayal-knife-name = Предательский кинжал
+uplink-betrayal-knife-desc = Предательский кинжал позволяет пользователю телепортироваться на короткое расстояние, а также наносит значительные повреждения при ударе в спину.

Resources/Prototypes/_White/Catalog/uplink_catalog.yml

@@ -7,3 +7,20 @@
     Telecrystal: 3
   categories:
     - UplinkUtility
+
+- type: listing
+  id: UplinkBetrayalKnife
+  name: uplink-betrayal-knife-name
+  description: uplink-betrayal-knife-desc
+  icon: { sprite: /Textures/_White/Objects/Weapons/Melee/Daggers/betrayal_knife.rsi, state: icon }
+  productEntity: BetrayalKnife
+  cost:
+    Telecrystal: 10
+  categories:
+  - UplinkWeapons
+  conditions:
+  - !type:StoreWhitelistCondition
+    blacklist:
+      tags:
+      - NukeOpsUplink
+  saleLimit: 1

Resources/Prototypes/_White/Entities/Objects/Weapons/Melee/daggers.yml

@@ -28,5 +28,6 @@
           Slash: 20
     - type: DisarmMalus
       malus: 0.225
+    - type: BackStab
     - type: Blink
       blinkRate: 0.33