Lua Increase mana cost with each cast

[Albanon]

I'd like to take a simple spell like energy strike

local combat = createCombatObject()
setCombatParam(combat, COMBAT_PARAM_TYPE, COMBAT_ENERGYDAMAGE)
setCombatParam(combat, COMBAT_PARAM_EFFECT, CONST_ME_ENERGYAREA)
setCombatParam(combat, COMBAT_PARAM_DISTANCEEFFECT, CONST_ANI_ENERGY)
setCombatFormula(combat, COMBAT_FORMULA_LEVELMAGIC, -1, -10, -1, -20, 5, 5, 1.4, 2.1)

function onCastSpell(cid, var)
    return doCombat(cid, combat, var)
end

and make it so that if you do not wait 5 seconds before casting it again it will drain twice as much mana the second time you cast it, and then, twice as much mana again the third, and then the fourth, and fifith ect

but I am not sure how to go about doing something like that


so, lets say it costs 2 mana to cast the first time, you cast it....then you decide to spam it over and over - 2 becomes 4, 4 becomes 8, 8 becomes 16, 16 becomes 32, and it just keeps adding up - then after 5 seconds, it goes back down to 2 mana again

 

[StreamSide]

use storages

 

[Albanon]

Im not sure what you mean

local combat = createCombatObject()
setCombatParam(combat, COMBAT_PARAM_TYPE, COMBAT_ENERGYDAMAGE)
setCombatParam(combat, COMBAT_PARAM_EFFECT, CONST_ME_ENERGYAREA)
setCombatParam(combat, COMBAT_PARAM_DISTANCEEFFECT, CONST_ANI_ENERGY)
setCombatFormula(combat, COMBAT_FORMULA_LEVELMAGIC, -1, -10, -1, -20, 5, 5, 1.4, 2.1)

function onCastSpell(cid, var)
local cast = 0
local mana = doCreatureAddMana(cid, -20 )



if cast == 0 then
doCreatureAddMana(cid, -20 )
cast = cast + 1
return doCombat(cid, combat, var)

elseif cast == 1 then
cast = cast + 1
doCreatureAddMana(cid, -40 )
doBroadcastMessage(cast, type)
return doCombat(cid, combat, var)










end

This doesn't really work, im not sure of a better way to do it though, maybe with a loop?

but how would I Factor in time?

would you explain how I would use storages?