local tgs = nil
transitionGameSpeed = function(value, duration, callback)
    if tgs ~= nil then
        outputDebugString("Error: transitionGameSpeed is already active", 1, 255, 0, 0)
        return false
    end

    if value == nil then
        outputDebugString("Error: transitionGameSpeed expected atleast 1 parameter", 1, 255, 0, 0)
        return false
    end

    tgs = {
        startTick = getTickCount(),
        initialSpeed = getGameSpeed(),
        targetSpeed = value,
        duration = duration or 1000,
        callback = callback or nil
    }
    addEventHandler("onClientRender", root, doGameSpeedEasing)
end

doGameSpeedEasing = function()
    local progress = (getTickCount() - tgs.startTick) / ((tgs.startTick + tgs.duration) - tgs.startTick)
    local currentSpeed = math.round(getGameSpeed(), 1, (tgs.initialSpeed > tgs.targetSpeed and "ceil" or "floor"))
    local newSpeed, _, _ = interpolateBetween(currentSpeed, 0.0, 0.0, tgs.targetSpeed, 0.0, 0.0, progress, "InOutQuad")

    newSpeed = math.round(newSpeed, 4, (tgs.initialSpeed > tgs.targetSpeed and "floor" or "ceil"))
    if tgs.initialSpeed > tgs.targetSpeed and newSpeed <= tgs.targetSpeed then
        newSpeed = math.round(newSpeed, 1, "ceil")
    elseif tgs.initialSpeed < tgs.targetSpeed and newSpeed >= tgs.targetSpeed then
        newSpeed = math.round(newSpeed, 1, "floor")
    end

    setGameSpeed(newSpeed)
    if newSpeed == tgs.targetSpeed then
        removeEventHandler("onClientRender", root, doGameSpeedEasing)
        if type(tgs.callback) == "function" then tgs.callback() end
        tgs = nil
    end
end

math.round = function(number, decimals, method)
    decimals = decimals or 0
    local factor = 10 ^ decimals
    if (method == "ceil" or method == "floor") then return math[method](number * factor) / factor
    else return tonumber(("%."..decimals.."f"):format(number)) end
end