Play time tracking: Job timers 3: more titles: when the (#9978)

Co-authored-by: Veritius <veritiusgaming@gmail.com>
Co-authored-by: metalgearsloth <comedian_vs_clown@hotmail.com>

Content.Server/Afk/AFKSystem.cs

@@ -0,0 +1,96 @@
+using System.Linq;
+using Content.Server.Afk.Events;
+using Content.Server.GameTicking;
+using Content.Shared.CCVar;
+using Robust.Server.Player;
+using Robust.Shared.Configuration;
+using Robust.Shared.Enums;
+using Robust.Shared.Player;
+
+namespace Content.Server.Afk;
+
+/// <summary>
+/// Actively checks for AFK players regularly and issues an event whenever they go afk.
+/// </summary>
+public sealed class AFKSystem : EntitySystem
+{
+    [Dependency] private readonly IAfkManager _afkManager = default!;
+    [Dependency] private readonly IConfigurationManager _configManager = default!;
+    [Dependency] private readonly IPlayerManager _playerManager = default!;
+    [Dependency] private readonly GameTicker _ticker = default!;
+
+    private float _checkDelay;
+    private float _accumulator;
+
+    private readonly HashSet<IPlayerSession> _afkPlayers = new();
+
+    public override void Initialize()
+    {
+        base.Initialize();
+        _playerManager.PlayerStatusChanged += OnPlayerChange;
+        _configManager.OnValueChanged(CCVars.AfkTime, SetAfkDelay, true);
+    }
+
+    private void SetAfkDelay(float obj)
+    {
+        _checkDelay = obj;
+    }
+
+    private void OnPlayerChange(object? sender, SessionStatusEventArgs e)
+    {
+        switch (e.NewStatus)
+        {
+            case SessionStatus.Disconnected:
+                _afkPlayers.Remove(e.Session);
+                break;
+        }
+    }
+
+    public override void Shutdown()
+    {
+        base.Shutdown();
+        _afkPlayers.Clear();
+        _accumulator = 0f;
+        _playerManager.PlayerStatusChanged -= OnPlayerChange;
+        _configManager.UnsubValueChanged(CCVars.AfkTime, SetAfkDelay);
+    }
+
+    public override void Update(float frameTime)
+    {
+        base.Update(frameTime);
+
+        if (_ticker.RunLevel != GameRunLevel.InRound)
+        {
+            _afkPlayers.Clear();
+            _accumulator = 0f;
+            return;
+        }
+
+        _accumulator += frameTime;
+
+        // TODO: Should also listen to the input events for more accurate timings.
+        if (_accumulator < _checkDelay) return;
+
+        _accumulator -= _checkDelay;
+
+        foreach (var session in Filter.GetAllPlayers())
+        {
+            var pSession = (IPlayerSession) session;
+            var isAfk = _afkManager.IsAfk(pSession);
+
+            if (isAfk && _afkPlayers.Add(pSession))
+            {
+                var ev = new AFKEvent(pSession);
+                RaiseLocalEvent(ref ev);
+                continue;
+            }
+
+            if (!isAfk && _afkPlayers.Remove(pSession))
+            {
+                var ev = new UnAFKEvent(pSession);
+                RaiseLocalEvent(ref ev);
+                continue;
+            }
+        }
+    }
+}