// Vanilla caches are tied to the original game mode. Release its exact
// components before takeover. Some vanilla destructors unconditionally clear
// their static cache later; resolve those getters from the current takeover
// owner so delayed destruction cannot invalidate the replacement.
modded class SCR_ArsenalManagerComponent
{
 static void ERR_ReleaseTerrainSingleton(SCR_ArsenalManagerComponent expected)
 {
  if (s_Instance == expected) s_Instance = null;
 }
}

modded class SCR_GroupsManagerComponent
{
 static void ERR_ReleaseTerrainSingleton(SCR_GroupsManagerComponent expected)
 {
  if (s_Instance == expected) s_Instance = null;
 }
}

modded class SCR_SupportStationManagerComponent
{
 static void ERR_ReleaseTerrainSingleton(SCR_SupportStationManagerComponent expected)
 {
  if (s_Instance == expected) s_Instance = null;
 }
}

modded class SCR_TaskFinishHistoryManagerComponent
{
 static void ERR_ReleaseTerrainSingleton(SCR_TaskFinishHistoryManagerComponent expected)
 {
  if (s_Instance == expected) s_Instance = null;
 }
 override static SCR_TaskFinishHistoryManagerComponent GetInstance()
 {
  ERR_TerrainTakeoverMode mode;
  if (GetGame()) mode = ERR_TerrainTakeoverMode.Cast(GetGame().GetGameMode());
  if (mode) return SCR_TaskFinishHistoryManagerComponent.Cast(mode.FindComponent(SCR_TaskFinishHistoryManagerComponent));
  return super.GetInstance();
 }
}

modded class SCR_TaskManagerUIComponent
{
 static void ERR_ReleaseTerrainSingleton(SCR_TaskManagerUIComponent expected)
 {
  if (s_Instance == expected) s_Instance = null;
 }
 override static SCR_TaskManagerUIComponent GetInstance()
 {
  ERR_TerrainTakeoverMode mode;
  if (GetGame()) mode = ERR_TerrainTakeoverMode.Cast(GetGame().GetGameMode());
  if (mode) return SCR_TaskManagerUIComponent.Cast(mode.FindComponent(SCR_TaskManagerUIComponent));
  return super.GetInstance();
 }
}

modded class SCR_TextsTaskManagerComponent
{
 static void ERR_ReleaseTerrainSingleton(SCR_TextsTaskManagerComponent expected)
 {
  if (s_Instance == expected) s_Instance = null;
 }
 override static SCR_TextsTaskManagerComponent GetInstance()
 {
  ERR_TerrainTakeoverMode mode;
  if (GetGame()) mode = ERR_TerrainTakeoverMode.Cast(GetGame().GetGameMode());
  if (mode) return SCR_TextsTaskManagerComponent.Cast(mode.FindComponent(SCR_TextsTaskManagerComponent));
  return super.GetInstance();
 }
}

modded class SCR_MapMarkerManagerComponent
{
 override static SCR_MapMarkerManagerComponent GetInstance()
 {
  ERR_TerrainTakeoverMode mode;
  if (GetGame()) mode = ERR_TerrainTakeoverMode.Cast(GetGame().GetGameMode());
  if (mode) return SCR_MapMarkerManagerComponent.Cast(mode.FindComponent(SCR_MapMarkerManagerComponent));
  return super.GetInstance();
 }
}

modded class SCR_RespawnSystemComponent
{
 override static SCR_RespawnSystemComponent GetInstance()
 {
  ERR_TerrainTakeoverMode mode;
  if (GetGame()) mode = ERR_TerrainTakeoverMode.Cast(GetGame().GetGameMode());
  if (mode) return SCR_RespawnSystemComponent.Cast(mode.FindComponent(SCR_RespawnSystemComponent));
  return super.GetInstance();
 }
}

// Standalone global nodes otherwise have no delivery-order relationship. During
// a connected restart a faction delegate can arrive before its new mode and
// faction manager. Express that dependency to replication before publishing the
// newly spawned hierarchy, rather than relying on an arbitrary frame delay.
class ERR_TerrainTakeoverReplication
{
 static void CollectDelegates(SCR_DelegateFactionManagerComponent manager, array<IEntity> entities)
 {
  if (!manager) return;
  map<Faction, SCR_EditableFactionComponent> delegates = new map<Faction, SCR_EditableFactionComponent>();
  manager.GetFactionDelegates(delegates);
  for (int i = 0; i < delegates.Count(); i++)
  {
   SCR_EditableFactionComponent delegate = delegates.GetElement(i);
   if (delegate && delegate.GetOwner() && !entities.Contains(delegate.GetOwner())) entities.Insert(delegate.GetOwner());
  }
 }
 protected static bool Parent(IEntity entity, IEntity parent)
 {
  RplComponent childRpl = SCR_EntityHelper.GetEntityRplComponent(entity);
  RplComponent parentRpl = SCR_EntityHelper.GetEntityRplComponent(parent);
  if (!childRpl || !parentRpl) return false;
  RplNode childNode = childRpl.GetNode();
  RplNode parentNode = parentRpl.GetNode();
  if (!childNode || !parentNode || childNode == parentNode) return false;
  if (childNode.GetParent() != parentNode) childNode.SetParent(parentNode);
  return childNode.GetParent() == parentNode;
 }
 static bool Link(ERR_GameMode mode)
 {
  IEntity factions = GetGame().GetFactionManager();
  if (!factions || !Parent(factions, mode)) return false;
  if (!Parent(GetGame().GetLoadoutManager(), mode) || !Parent(GetGame().GetChat(), mode)) return false;
  SCR_DelegateFactionManagerComponent manager = SCR_DelegateFactionManagerComponent.GetInstance();
  if (!manager) return false;
  map<Faction, SCR_EditableFactionComponent> delegates = new map<Faction, SCR_EditableFactionComponent>();
  manager.GetFactionDelegates(delegates);
  for (int i = 0; i < delegates.Count(); i++)
  {
   SCR_EditableFactionComponent delegate = delegates.GetElement(i);
   if (!delegate || !Parent(delegate.GetOwner(), factions)) return false;
  }
  return !delegates.IsEmpty();
 }
}