Chem guidebook (#17123)

* im good at atomizing. welcome to half-finished chem guides.

* wagh

* e

* save work

* aa

* woweee UI

* finishing the last of it

* don't actually update the engine :(

---------

Co-authored-by: moonheart08 <moonheart08@users.noreply.github.com>

Content.Server/Chemistry/EntitySystems/ChemistryGuideDataSystem.cs

@@ -0,0 +1,67 @@
+using Content.Shared.Chemistry;
+using Content.Shared.Chemistry.Reagent;
+using Robust.Server.Player;
+using Robust.Shared.Enums;
+using Robust.Shared.Prototypes;
+
+namespace Content.Server.Chemistry.EntitySystems;
+
+
+public sealed class ChemistryGuideDataSystem : SharedChemistryGuideDataSystem
+{
+    [Dependency] private readonly IPlayerManager _player = default!;
+
+    /// <inheritdoc/>
+    public override void Initialize()
+    {
+        base.Initialize();
+
+        PrototypeManager.PrototypesReloaded += PrototypeManagerReload;
+
+        _player.PlayerStatusChanged += OnPlayerStatusChanged;
+
+        InitializeServerRegistry();
+    }
+
+    private void InitializeServerRegistry()
+    {
+        var changeset = new ReagentGuideChangeset(new Dictionary<string, ReagentGuideEntry>(), new HashSet<string>());
+        foreach (var proto in PrototypeManager.EnumeratePrototypes<ReagentPrototype>())
+        {
+            var entry = new ReagentGuideEntry(proto, PrototypeManager, EntityManager.EntitySysManager);
+            changeset.GuideEntries.Add(proto.ID, entry);
+            Registry[proto.ID] = entry;
+        }
+
+        var ev = new ReagentGuideRegistryChangedEvent(changeset);
+        RaiseNetworkEvent(ev);
+    }
+
+    private void OnPlayerStatusChanged(object? sender, SessionStatusEventArgs e)
+    {
+        if (e.NewStatus != SessionStatus.Connected)
+            return;
+
+        var sendEv = new ReagentGuideRegistryChangedEvent(new ReagentGuideChangeset(Registry, new HashSet<string>()));
+        RaiseNetworkEvent(sendEv, e.Session);
+    }
+
+    private void PrototypeManagerReload(PrototypesReloadedEventArgs obj)
+    {
+        if (!obj.ByType.TryGetValue(typeof(ReagentPrototype), out var reagents))
+            return;
+
+        var changeset = new ReagentGuideChangeset(new Dictionary<string, ReagentGuideEntry>(), new HashSet<string>());
+
+        foreach (var (id, proto) in reagents.Modified)
+        {
+            var reagentProto = (ReagentPrototype) proto;
+            var entry = new ReagentGuideEntry(reagentProto, PrototypeManager, EntityManager.EntitySysManager);
+            changeset.GuideEntries.Add(id, entry);
+            Registry[id] = entry;
+        }
+
+        var ev = new ReagentGuideRegistryChangedEvent(changeset);
+        RaiseNetworkEvent(ev);
+    }
+}