Lua function for TableTop Simulator to figure out which player gets an extra card

13card.lua

--[[
This lua script is for a TableTop Simulator game I'm working on called
"May I" that is similar to Rummy. In the game 12 cards are dealt to
all the players, with the player to the left of the dealer getting an
extra card. This is my solution at getting it working, and also as 
a way to learn more Lua.
--]]

-- Fixed color array
colors = {}
colors[1] = "white"
colors[2] = "brown"
colors[3] = "red"
colors[4] = "orange"
colors[5] = "yellow"
colors[6] = "green"
colors[7] = "teal"
colors[8] = "blue"
colors[9] = "purple"

-- This is the order of players
players = {}
players[1] = "purple" 
players[2] = "orange"
players[3] = "white"
players[4] = "green"

--[[
        O
    W       G
        P

 purple should give extra to white
 white should give extra to orange
 orange should give extra to green
 green should give extra to purple
--]]

local function isempty(s)
    return s == nil or s == ''
end

local player = "purple"

local totalColorCount = 0
for k,v in pairs(colors) do
    totalColorCount = totalColorCount + 1
end
print("There are " .. totalColorCount .. " colors")

local playerColorPos = 1
for k,v in pairs(colors) do
    if v == player then
        break
    else
        playerColorPos = playerColorPos + 1
    end
end
print("start num is " .. playerColorPos)

-- now we need to know where to start for the next pass
local nextNum = 0
if playerColorPos == totalColorCount then
    nextNum = 1
else
    nextNum = playerColorPos + 1
end

print("Next num is " .. nextNum)

local skipNum = 1
local nextColor

for k, v in pairs(colors) do
    if skipNum >= nextNum then
        for pk, pv in pairs(players) do
            if v == pv then
                nextColor = pv
                break
            end
        end

        if isempty(nextColor) == false then
            break
        end
    else
        skipNum = skipNum + 1
    end
end

print("the next color should be " .. nextColor)