/*
 * Copyright (C) 2016+ AzerothCore <www.azerothcore.org>, released under GNU GPL v2 license, you may redistribute it and/or modify it under version 2 of the License, or (at your option), any later version.
 */

#include "ItemForSpellValue.h"
#include "Playerbots.h"

#ifndef WIN32
inline int strcmpi(char const* s1, char const* s2)
{
    for (; *s1 && *s2 && (toupper(*s1) == toupper(*s2)); ++s1, ++s2);
        return *s1 - *s2;
}
#endif

Item* ItemForSpellValue::Calculate()
{
    uint32 spellid = atoi(qualifier.c_str());
    if (!spellid)
        return nullptr;

    SpellInfo const *spellInfo = sSpellMgr->GetSpellInfo(spellid);
    if (!spellInfo)
        return nullptr;

    Item* itemForSpell = nullptr;
    Player* trader = bot->GetTrader();
    if (trader)
    {
        itemForSpell = trader->GetTradeData()->GetItem(TRADE_SLOT_NONTRADED);
        if (itemForSpell && itemForSpell->IsFitToSpellRequirements(spellInfo))
            return itemForSpell;
    }

    Player* master = botAI->GetMaster();
    if (master)
    {
        trader = master->GetTrader();
        if (trader)
        {
            itemForSpell = trader->GetTradeData()->GetItem(TRADE_SLOT_NONTRADED);
            if (itemForSpell && itemForSpell->IsFitToSpellRequirements(spellInfo))
                return itemForSpell;
        }
    }

    // Workaround as some spells have no item mask (e.g. shaman weapon enhancements)
    if (!strcmpi(spellInfo->SpellName[0], "rockbiter weapon") || !strcmpi(spellInfo->SpellName[0], "flametongue weapon") || !strcmpi(spellInfo->SpellName[0], "earthliving weapon") ||
        !strcmpi(spellInfo->SpellName[0], "frostbrand weapon") || !strcmpi(spellInfo->SpellName[0], "windfury weapon"))
    {
        itemForSpell = GetItemFitsToSpellRequirements(EQUIPMENT_SLOT_MAINHAND, spellInfo);
        if (itemForSpell && itemForSpell->GetTemplate()->Class == ITEM_CLASS_WEAPON)
            return itemForSpell;

        itemForSpell = GetItemFitsToSpellRequirements(EQUIPMENT_SLOT_OFFHAND, spellInfo);
        if (itemForSpell && itemForSpell->GetTemplate()->Class == ITEM_CLASS_WEAPON)
            return itemForSpell;

        return nullptr;
    }

    if (!(spellInfo->Targets & TARGET_FLAG_ITEM))
        return nullptr;

    if (!strcmpi(spellInfo->SpellName[0], "disenchant"))
        return nullptr;

    for (uint8 slot = EQUIPMENT_SLOT_START; slot < EQUIPMENT_SLOT_END; slot++ )
    {
        itemForSpell = GetItemFitsToSpellRequirements(slot, spellInfo);
        if (itemForSpell)
            return itemForSpell;
    }

    return nullptr;
}

Item* ItemForSpellValue::GetItemFitsToSpellRequirements(uint8 slot, SpellInfo const *spellInfo)
{
    Item* const itemForSpell = bot->GetItemByPos( INVENTORY_SLOT_BAG_0, slot );
    if (!itemForSpell || itemForSpell->GetEnchantmentId(TEMP_ENCHANTMENT_SLOT))
        return nullptr;

    if (itemForSpell->IsFitToSpellRequirements(spellInfo))
        return itemForSpell;

    return nullptr;
}