Add tip about unpurchased RA TLs

Source/RP0/Addons/GameplayTips.cs

@@ -12,6 +12,8 @@ public class GameplayTips : MonoBehaviour
         private static bool _isInterplanetaryWarningShown;
 
         private bool _subcribedToPAWEvent;
+        private bool _hasNewPurchasableRATL;
+        private int _highestUnlockableRALvl;
 
         public static GameplayTips Instance { get; private set; }
 
@@ -56,7 +58,9 @@ internal void Start()
             }
             else if (HighLogic.LoadedSceneIsEditor)
             {
-                if (!rp0Settings.RealChuteTipShown)
+                LoadRAUpgradeStatus(rp0Settings);
+
+                if (_hasNewPurchasableRATL || !rp0Settings.RealChuteTipShown)
                 {
                     GameEvents.onPartActionUIShown.Add(OnPartActionUIShown);
                     _subcribedToPAWEvent = true;
@@ -75,6 +79,11 @@ private void OnPartActionUIShown(UIPartActionWindow paw, Part part)
             {
                 ShowRealChuteTip();
             }
+
+            if (_hasNewPurchasableRATL && part.Modules.Contains("ModuleRealAntenna"))
+            {
+                ShowRATechAvailableTip();
+            }
         }
 
         public void ShowInterplanetaryAvionicsReminder()
@@ -135,6 +144,23 @@ private void ShowRealChuteTip()
                                          HighLogic.UISkin).HideGUIsWhilePopup();
         }
 
+        private void ShowRATechAvailableTip()
+        {
+            var rp0Settings = HighLogic.CurrentGame.Parameters.CustomParams<RP0Settings>();
+            rp0Settings.RATLTipShown = _highestUnlockableRALvl;
+            _hasNewPurchasableRATL = false;
+
+            string msg = $"Communications Tech Level {_highestUnlockableRALvl} has been researched but not purchased. Purchase it in the R&D building to use higher-tech comms.";
+            PopupDialog.SpawnPopupDialog(new Vector2(0.5f, 0.5f),
+                                         new Vector2(0.5f, 0.5f),
+                                         "ShowRATLTip",
+                                         "New comms tech available",
+                                         msg,
+                                         KSP.Localization.Localizer.GetStringByTag("#autoLOC_190905"),
+                                         false,
+                                         HighLogic.UISkin).HideGUIsWhilePopup();
+        }
+
         private IEnumerator CheckLandedWhileActuallyFlying()
         {
             while (true)
@@ -254,5 +280,28 @@ public void ShowHSFProgramTip()
                 KSP.Localization.Localizer.Format("#rp0_GameplayTip_LaunchUntrainedPart_Title"), null, 300, options);
             PopupDialog.SpawnPopupDialog(diag, false, HighLogic.UISkin).HideGUIsWhilePopup();
         }
+
+        private void LoadRAUpgradeStatus(RP0Settings rp0Settings)
+        {
+            _highestUnlockableRALvl = rp0Settings.RATLTipShown;
+            const int tlUpgradeCount = 9;
+            for (int i = rp0Settings.RATLTipShown + 1; i <= tlUpgradeCount; i++)
+            {
+                string upgradeName = "commsTL" + i;
+                if (PartUpgradeManager.Handler.IsEnabled(upgradeName))
+                {
+                    rp0Settings.RATLTipShown = i;
+                    continue;
+                }
+
+                if (PartUpgradeManager.Handler.IsAvailableToUnlock(upgradeName))
+                {
+                    _highestUnlockableRALvl = i;
+                    _hasNewPurchasableRATL = true;
+                    continue;
+                }
+                break;
+            }
+        }
     }
 }

Source/RP0/Settings/GameParameters.cs

@@ -85,6 +85,7 @@ public class RP0Settings : GameParameters.CustomParameterNode
         public bool AvionicsWindow_ShowInfo3 = true;
         public bool NeverShowUntrainedReminders = false;
         public bool NeverShowHSFProgramReminders = false;
+        public int RATLTipShown = 0;
 
         public string CareerLog_URL;
         public string CareerLog_Token;