Add fax admin panel (#15215)

Content.Server/Fax/AdminUI/AdminFaxEui.cs

@@ -0,0 +1,65 @@
+using Content.Server.DeviceNetwork.Components;
+using Content.Server.EUI;
+using Content.Server.Ghost.Components;
+using Content.Shared.Eui;
+using Content.Shared.Fax;
+using Content.Shared.Follower;
+
+namespace Content.Server.Fax.AdminUI;
+
+public sealed class AdminFaxEui : BaseEui
+{
+    [Dependency] private readonly IEntityManager _entityManager = default!;
+    private readonly FaxSystem _faxSystem;
+    private readonly FollowerSystem _followerSystem;
+
+    public AdminFaxEui()
+    {
+        IoCManager.InjectDependencies(this);
+        _faxSystem = IoCManager.Resolve<IEntitySystemManager>().GetEntitySystem<FaxSystem>();
+        _followerSystem = IoCManager.Resolve<IEntitySystemManager>().GetEntitySystem<FollowerSystem>();
+    }
+
+    public override void Opened()
+    {
+        StateDirty();
+    }
+
+    public override AdminFaxEuiState GetNewState()
+    {
+        var faxes = _entityManager.EntityQueryEnumerator<FaxMachineComponent, DeviceNetworkComponent>();
+        var entries = new List<AdminFaxEntry>();
+        while (faxes.MoveNext(out var uid, out var fax, out var device))
+        {
+            entries.Add(new AdminFaxEntry(uid, fax.FaxName, device.Address));
+        }
+        return new AdminFaxEuiState(entries);
+    }
+
+    public override void HandleMessage(EuiMessageBase msg)
+    {
+        switch (msg)
+        {
+            case AdminFaxEuiMsg.Close:
+            {
+                Close();
+                break;
+            }
+            case AdminFaxEuiMsg.Follow followData:
+            {
+                if (Player.AttachedEntity == null ||
+                    !_entityManager.HasComponent<GhostComponent>(Player.AttachedEntity.Value))
+                    return;
+
+                _followerSystem.StartFollowingEntity(Player.AttachedEntity.Value, followData.TargetFax);
+                break;
+            }
+            case AdminFaxEuiMsg.Send sendData:
+            {
+                var printout = new FaxPrintout(sendData.Content, sendData.Title, null, sendData.StampState, new() { sendData.From });
+                _faxSystem.Receive(sendData.Target, printout);
+                break;
+            }
+        }
+    }
+}