Level setter

#include "ScriptPCH.h"
#define StartLevel  1
#define MaxLevel    80
#define Increment   i+2

class Level_NPC : public CreatureScript
{
public:
    Level_NPC() : CreatureScript("Level_NPC") {}

    bool OnGossipHello(Player* pPlayer, Creature* _creature)
    {
        pPlayer->ADD_GOSSIP_ITEM(7, "Welcome to the level NPC!", GOSSIP_SENDER_MAIN, 0);
        for (uint32 i = StartLevel; i <= MaxLevel; i = Increment)
            pPlayer->ADD_GOSSIP_ITEM(10, "Level "+i, 10, i);

        pPlayer->PlayerTalkClass->SendGossipMenu(907, _creature->GetGUID());
        return true;
    }

    bool OnGossipSelect(Player* pPlayer, Creature* _creature, uint32 uiSender, uint32 uiAction)
    {
        pPlayer->PlayerTalkClass->ClearMenus();
        if(uiSender == 10 && uiAction >= StartLevel && uiAction <= MaxLevel)
        {
            if(pPlayer->getLevel() < uiAction)
            {
                if(!HandleResetStatsOrLevelHelper(pPlayer))
                {
                    OnGossipHello(pPlayer, _creature);
                    return true;
                }
                pPlayer->_ApplyAllLevelScaleItemMods(false);
                pPlayer->SetLevel(uiAction);
                pPlayer->InitRunes();
                pPlayer->InitStatsForLevel(true);
                pPlayer->InitTaxiNodesForLevel();
                pPlayer->InitGlyphsForLevel();
                pPlayer->InitTalentForLevel();
                pPlayer->SetUInt32Value(PLAYER_XP, 0);
                pPlayer->resetSpells(true);

                pPlayer->_ApplyAllLevelScaleItemMods(true);

                // reset level for pet
                if (Pet* pet = pPlayer->GetPet())
                    pet->SynchronizeLevelWithOwner();
            }
            else
                pPlayer->SetLevel(uiAction);
            pPlayer->GetSession()->SendAreaTriggerMessage("You are now Level %u!", uiAction);
        }

        OnGossipHello(pPlayer, _creature);
        return true;
    }

    bool HandleResetStatsOrLevelHelper(Player* player)
    {
        ChrClassesEntry const* classEntry = sChrClassesStore.LookupEntry(player->getClass());
        if (!classEntry)
        {
            return false;
        }

        uint8 powerType = classEntry->powerType;

        // reset m_form if no aura
        if (!player->HasAuraType(SPELL_AURA_MOD_SHAPESHIFT))
            player->SetShapeshiftForm(FORM_NONE);

        player->SetFloatValue(UNIT_FIELD_BOUNDINGRADIUS, DEFAULT_WORLD_OBJECT_SIZE);
        player->SetFloatValue(UNIT_FIELD_COMBATREACH, DEFAULT_COMBAT_REACH);

        player->setFactionForRace(player->getRace());

        player->SetUInt32Value(UNIT_FIELD_BYTES_0, ((player->getRace()) | (player->getClass() << 8) | (player->getGender() << 16) | (powerType << 24)));

        // reset only if player not in some form;
        if (player->GetShapeshiftForm() == FORM_NONE)
            player->InitDisplayIds();

        player->SetByteValue(UNIT_FIELD_BYTES_2, 1, UNIT_BYTE2_FLAG_PVP);

        player->SetUInt32Value(UNIT_FIELD_FLAGS, UNIT_FLAG_PVP_ATTACKABLE);

        //-1 is default value
        player->SetUInt32Value(PLAYER_FIELD_WATCHED_FACTION_INDEX, uint32(-1));

        //player->SetUInt32Value(PLAYER_FIELD_BYTES, 0xEEE00000);
        return true;
    }
};

void AddSC_Level_NPC()
{
    new Level_NPC();
}