-----------------------------------
-- Ability: Modus Veritas
-- Increases damage done by helix spells while lowering spell duration by 50%.
-- Obtained: Scholar Level 65
-- Recast Time: 3:00
-- Duration: Instant
-----------------------------------
---@type TAbility
local abilityObject = {}

abilityObject.onAbilityCheck = function(player, target, ability)
    return 0, 0
end

abilityObject.onUseAbility = function(player, target, ability)
    local helix = target:getStatusEffect(xi.effect.HELIX)
    if not helix then
        ability:setMsg(xi.msg.basic.JA_NO_EFFECT_2) -- No effect
        return 0
    end

    local mvPower = helix:getSubPower()
    local params  = { skillType = xi.skill.ELEMENTAL_MAGIC }
    local resist  = xi.combat.magicHitRate.calculateResistRate(player, target, params)

    -- Doesn't work against NMs apparently
    if mvPower > 0 or resist < 0.25 or target:isNM() then -- Don't let Modus Veritas stack to prevent abuse
        ability:setMsg(xi.msg.basic.JA_MISS) --Miss
        return 0
    end

    -- Double power and halve remaining time
    local durationMultiplier = 0.5 + 0.05 * player:getMerit(xi.merit.MODUS_VERITAS_DURATION)
    local helixPower         = 2 * helix:getPower() + 3 * player:getJobPointLevel(xi.jp.MODUS_VERITAS_EFFECT)
    local duration           = helix:getDuration()
    local remaining          = math.floor(helix:getTimeRemaining() / 1000) -- from milliseconds

    duration = duration - remaining + math.floor(remaining * durationMultiplier)
    helix:setSubPower(mvPower + 1)
    helix:setPower(helixPower)
    helix:setDuration(duration * 1000) -- back to milliseconds
end

return abilityObject