chore(Core/Instance): add check boss states for Naxxramas (to frostwy…

…rm lair)

data/sql/custom/db_world/2020_07_06_00_nax_teleport.sql

@@ -0,0 +1,3 @@
+-- Add areatrigger_scripts for nax tp
+DELETE FROM `areatrigger_scripts` WHERE `entry` = 4156;
+INSERT INTO `areatrigger_scripts`(`entry`, `ScriptName`) VALUES (4156, 'nax_frostwyrm_lair');

src/server/scripts/World/areatrigger_scripts.cpp

@@ -488,6 +488,34 @@ class AreaTrigger_at_area_52_entrance : public AreaTriggerScript
         std::map<uint32, time_t> _triggerTimes;
 };
 
+class AreaTrigger_nax_frostwyrm_lair : public AreaTriggerScript
+{
+public: AreaTrigger_nax_frostwyrm_lair() : AreaTriggerScript("nax_frostwyrm_lair") { }
+
+    bool OnTrigger(Player* player, AreaTrigger const* /*trigger*/)
+    {
+        if (!player)
+            return true;
+
+        auto instanceScript = player->GetInstanceScript();
+        if (instanceScript->GetBossState(BOSS_LOATHEB) != EncounterState::DONE ||
+            instanceScript->GetBossState(BOSS_MAEXXNA) != EncounterState::DONE ||
+            instanceScript->GetBossState(BOSS_THADDIUS) != EncounterState::DONE ||
+            instanceScript->GetBossState(BOSS_HORSEMAN) != EncounterState::DONE)
+            return true;
+
+        return false;
+    }
+private:
+    enum NaxBosses
+    {
+        BOSS_LOATHEB   = 5,
+        BOSS_MAEXXNA   = 8,
+        BOSS_THADDIUS  = 9,
+        BOSS_HORSEMAN  = 12
+    };
+};
+
 void AddSC_areatrigger_scripts()
 {
     // Ours
@@ -504,4 +532,6 @@ void AddSC_areatrigger_scripts()
     new AreaTrigger_at_sentry_point();
     new AreaTrigger_at_brewfest();
     new AreaTrigger_at_area_52_entrance();
+
+    new AreaTrigger_nax_frostwyrm_lair();
 }