local keywordHandler = KeywordHandler:new()
local npcHandler = NpcHandler:new(keywordHandler)
NpcSystem.parseParameters(npcHandler)

function onCreatureAppear(cid)            npcHandler:onCreatureAppear(cid)            end
function onCreatureDisappear(cid)        npcHandler:onCreatureDisappear(cid)            end
function onCreatureSay(cid, type, msg)    npcHandler:onCreatureSay(cid, type, msg)    end
function onThink()                        npcHandler:onThink()    end

local vocationCount = 4
local config = {
    ["first"] = { lvl = 20, cost = 20000, id = 1 },
    ["second"] = { lvl = 20, cost = 100000, id = 2 }
}

function creatureSayCallback(cid, type, msg)
    if not npcHandler:isFocused(cid) then
        return false
    end
    local player = Player(cid)
    local pname = msg:lower()
    local getPromotion = config[pname]
    if not getPromotion then
        return selfSay("The promotion you ask for does not exist.", cid)
    end
    local vocid = player:getVocation():getId()
    local count = math.floor(vocid / vocationCount)
    local canPromotion = (count - getPromotion.id)
    if canPromotion < -1 then
        return selfSay("You still can not acquire this promotion.", cid)
    elseif canPromotion == 1 then
        return selfSay("You can not degrade your promotion.", cid)
    elseif canPromotion == 0 then
        return selfSay(string.format("You already have the %s promotion.", pname), cid)
    end
    if player:getLevel() < gwetPromotion.lvl then
        return selfSay(string.format("You need level %u+ for the %s promotion.", getPromotion.lvl, pname), cid)
    end
    if not player:removeMoney(getPromotion.cost) then
        return selfSay("You do not have enough money.", cid)
    end
    local newVocation = Vocation(vocid + vocationCount)
    player:setVocation(newVocation)
    selfSay(string.format("You have been successfully promoted to %s.", newVocation:getName()), cid)
    player:getPosition():sendMagicEffect(CONST_ME_FIREWORK_BLUE)
    return true
end

npcHandler:setCallback(CALLBACK_MESSAGE_DEFAULT, creatureSayCallback)
npcHandler:addModule(FocusModule:new())