Core/Group: implement automatic party/raid leader change when the leader has been offline for two minutes (#23398)

* Core/Group: implement automatic party/raid leader change when the leader has been offline for two minutes.

* Add #23396 to make testing easier.

* Prioritize assistants in raids.

* Fix dumb mistake and apply suggested change, thanks VincentVanclef and jackpoz!

(cherry picked from commit e906a2fe7d71fc17de9f7ea4778970beb3f9265e)

1 files changed, 63 insertions, 6 deletions

diff --git a/src/server/game/Groups/Group.cpp b/src/server/game/Groups/Group.cpp
index b69beb76ebe..7cbcbecc934 100644
--- a/src/server/game/Groups/Group.cpp
+++ b/src/server/game/Groups/Group.cpp
@@ -62,7 +62,7 @@ Loot* Roll::getLoot()
 Group::Group() : m_leaderGuid(), m_leaderName(""), m_groupFlags(GROUP_FLAG_NONE), m_groupCategory(GROUP_CATEGORY_HOME),
 m_dungeonDifficulty(DIFFICULTY_NORMAL), m_raidDifficulty(DIFFICULTY_NORMAL_RAID), m_legacyRaidDifficulty(DIFFICULTY_10_N),
 m_bgGroup(nullptr), m_bfGroup(nullptr), m_lootMethod(FREE_FOR_ALL), m_lootThreshold(ITEM_QUALITY_UNCOMMON), m_looterGuid(),
-m_masterLooterGuid(), m_subGroupsCounts(nullptr), m_guid(), m_maxEnchantingLevel(0), m_dbStoreId(0),
+m_masterLooterGuid(), m_subGroupsCounts(nullptr), m_guid(), m_maxEnchantingLevel(0), m_dbStoreId(0), m_isLeaderOffline(false),
 m_readyCheckStarted(false), m_readyCheckTimer(Milliseconds::zero()), m_activeMarkers(0)
 {
     for (uint8 i = 0; i < TARGET_ICONS_COUNT; ++i)
@@ -102,6 +102,57 @@ Group::~Group()
     delete[] m_subGroupsCounts;
 }
 
+void Group::Update(uint32 diff)
+{
+    if (m_isLeaderOffline)
+    {
+        m_leaderOfflineTimer.Update(diff);
+        if (m_leaderOfflineTimer.Passed())
+        {
+            SelectNewPartyOrRaidLeader();
+            m_isLeaderOffline = false;
+        }
+    }
+
+    UpdateReadyCheck(diff);
+}
+
+void Group::SelectNewPartyOrRaidLeader()
+{
+    Player* newLeader = nullptr;
+
+    // Attempt to give leadership to main assistant first
+    if (isRaidGroup())
+    {
+        for (Group::MemberSlot const& memberSlot : m_memberSlots)
+        {
+            if ((memberSlot.flags & MEMBER_FLAG_ASSISTANT) == MEMBER_FLAG_ASSISTANT)
+                if (Player* player = ObjectAccessor::FindPlayer(memberSlot.guid))
+                {
+                    newLeader = player;
+                    break;
+                }
+        }
+    }
+
+    // If there aren't assistants in raid, or if the group is not a raid, pick the first available member
+    if (!newLeader)
+    {
+        for (Group::MemberSlot const& memberSlot : m_memberSlots)
+            if (Player* player = ObjectAccessor::FindPlayer(memberSlot.guid))
+            {
+                newLeader = player;
+                break;
+            }
+    }
+
+    if (newLeader)
+    {
+        ChangeLeader(newLeader->GetGUID());
+        SendUpdate();
+    }
+}
+
 bool Group::Create(Player* leader)
 {
     ObjectGuid leaderGuid = leader->GetGUID();
@@ -2265,11 +2316,6 @@ uint8 Group::GetLfgRoles(ObjectGuid guid)
     return slot->roles;
 }
 
-void Group::Update(uint32 diff)
-{
-    UpdateReadyCheck(diff);
-}
-
 void Group::UpdateReadyCheck(uint32 diff)
 {
     if (!m_readyCheckStarted)
@@ -2681,6 +2727,17 @@ void Group::ToggleGroupMemberFlag(member_witerator slot, uint8 flag, bool apply)
         slot->flags &= ~flag;
 }
 
+void Group::StartLeaderOfflineTimer()
+{
+    m_isLeaderOffline = true;
+    m_leaderOfflineTimer.Reset(2 * MINUTE * IN_MILLISECONDS);
+}
+
+void Group::StopLeaderOfflineTimer()
+{
+    m_isLeaderOffline = false;
+}
+
 void Group::SetEveryoneIsAssistant(bool apply)
 {
     if (apply)