local function getLocals(level)
    local loc = 0
    return function()
        loc = loc + 1
        local i, v = debug.getlocal(level + 1, loc)
        if i then
            return i, v
        end
    end
end

local function getPrice(cid, shopItem)
    if Player(cid):getName() ~= 'Rotanev'  then
        return shopItem.buy, shopItem.sell
    end
    return shopItem.buy / 2, shopItem.sell * 2
end

for k, v in pairs(npcHandler.modules) do
    local getShopItem = v.getShopItem
    if getShopItem then
        v.getShopItem = function(self, itemId, itemSubType)
            local shopItem = getShopItem(self, itemId, itemSubType)
            if not shopItem then return nil end
            for i, v in getLocals(2) do
                if i == 'cid' then
                    local buy, sell = getPrice(v, shopItem)
                    return {id = shopItem.id, buy = buy, sell = sell, subType = shopItem.subType, name = shopItem.name}
                end
            end
            return shopItem
        end
        break
    end
end

local shopItems = npcHandler.shopItems
if shopItems then
    npcHandler.shopItems = newproxy(true)
    local mt = getmetatable(npcHandler.shopItems)
    mt.__index = function(self, index)
        for i, v in getLocals(2) do
            if i == 'cid' then
                local shopItem = rawget(shopItems, index)
                if not shopItem then return nil end
                local buy, sell = getPrice(v, shopItem)
                return {id = shopItem.id, buy = buy, sell = sell, subType = shopItem.subType, name = shopItem.name}
            end
        end

        return rawget(shopItems, index)
    end

    mt.__len = function(self)
        return #shopItems
    end

    local tablenext = next
    next = function(t, ...)
        if type(t) == 'userdata' then
            return #t > 0
        end
        return tablenext(t, ...)
    end
end