GCAPI

--[[

            --*--*--*--*--*--*--*--*--*--*--*--*--*--*--
            --*                GCAPI                 *--
            --*     https://pastebin.com/0uAaAcrW    *--
            --*            by: GravityCube           *--
            --*--*--*--*--*--*--*--*--*--*--*--*--*--*--


    Changelog:
        1.0.0 First release
        1.1.0 Image displayer for monitors added and bugs in the economy fixed
        1.2.0 Tracker of players and chatSpy added, a custom http.get was added and global peripheral.find.
        1.3.0 New listener, chatEvents and local admins for selling programs!
        1.4.0 Various bugs fixed (repited chatEvents, and rgb api changed). Added version changelog and getVersion()
        1.5.0 table.contains added
            1.5.1 ChatEvent Listener little fix
            1.5.2 Split function modified (self) and getChar added
            1.5.3 getCenter added and centered of monitors fixed
            1.5.4 getCenter now supports number and string in the #2 argument
            1.5.5 Added some default "URLs" to the images
            1.5.6 URL Alias updated
            1.5.7 Added password for unfiltered tracker (akaElite request)
        1.6.0 New method for tracking and some minor modifications.
            1.6.1 Some minor changes and bugs fixed
        1.7.0 New method gcapi.customMonitorWrite()
            1.7.1 Added table.isEmpty
            1.7.2 New admin (Freecss).
        1.8.0 New method printAvatar()
            1.8.1 New function getTime added and seed for random numbers changed.
            1.8.2 Added deepCopy function from http://lua-users.org/wiki/CopyTable
            1.8.3 An issue with getCenter was solved.
            1.8.4 The method getPlayersPos was deprecated but patched so the tracker could work
            1.8.5 Added getStaffList and filter_list for getPosPlayers
            1.8.6 Added toLower on filter_list
            1.8.7 Migrate jake endpoint to cc.emx.cl

--]]
--------------------------------------------
-->               Version                <--
--------------------------------------------
local debugAPI = false

local version = "1.8.6"

print("GCAPI Version: " .. version)

function getVersion()
    return version
end
--------------------------------------------
-->              URL ALIAS               <--
--------------------------------------------
local urlAlias = {
    ["emx"] = "http://jake.emx.cl/logo.jpg",
    ["cl"] = "https://i.imgur.com/hslZg4j.png",
    ["deadpool"] = "https://i.imgur.com/BXq9i6w.png"
}
--------------------------------------------
-->                Tools                 <--
--------------------------------------------

function getTime()
    --local response = http.get("http://jake.emx.cl/time.php")
    --if response then
    --  local millis = tonumber(response.readAll())
    --  if millis then
    --      return millis, true
    --  end
    --end
    return os.time(), false
end

local charToColor = {["0"]=0, ["1"]= 1,["2"]= 2, ["3"]=3, ["4"]=4, ["5"]=5, ["6"]=6, ["7"]=7, ["8"]=8, ["9"]=9, ["a"]=10 ,["b"]=11, ["c"]=12, ["d"]=13, ["e"]=14, ["f"]=15}
function customMonitorWrite(mon, text)
    local xi, yi = mon.getCursorPos()
    local chars = {}
    for i = 1, string.len(text) do
        local c = text:sub(i,i)
        table.insert(chars, c)
    end

    --charToColor["g"] = mon.getBackgroundColor()
    local isNumber = false
    for i=1, #chars, 1 do
        local c = chars[i]
        if c == "&" and charToColor[chars[i+1]] then
            color = 2^chars[i+1]
            mon.setBackgroundColor(color)
            isNumber = true
        else
            if not isNumber then
                mon.write(c)
            end
            isNumber = false
        end
    end
end


function verifyVar(rawVar, varType)
    if type(rawVar) ~= varType then
        error( "bad argument (expected " .. varType .. ", got " .. type( rawVar ) .. ")", 2 )
    end
end

-- RANDOM STRING
local charset = {}
-- qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM1234567890
for i = 48,  57 do table.insert(charset, string.char(i)) end
for i = 65,  90 do table.insert(charset, string.char(i)) end
for i = 97, 122 do table.insert(charset, string.char(i)) end

--math.randomseed(getTime())
function randomString(length)
    if length > 0 then
        return string.random(length - 1) .. charset[math.random(1, #charset)]
    else
        return ""
    end
end
string.random = randomString
--END RANDOM STRING

function getRandom(minValue, maxValue)
    return math.random(minValue, maxValue)
end

--peripheral.find() in Tekkit
function findPeripheral(pType)
    local pList = {}
    for _,pName in pairs(peripheral.getNames()) do
        if peripheral.getType(pName) == pType then
            table.insert(pList, peripheral.wrap(pName))
        end
    end
    return unpack(pList)
end
peripheral.find = findPeripheral

--Wipe table "t"
function wipeTable(t)
    local listForDeletion = {}
    for k,v in pairs(t) do
        table.insert(listForDeletion, k)
    end

    for _,i in pairs(listForDeletion) do
        t[i] = nil
    end
end
table.wipe = wipeTable

--Split string
function split(self, delimiter)
    result = {};
    for match in (self..delimiter):gmatch("(.-)"..delimiter) do
        table.insert(result, match);
    end
    return result;
end
string.split = split

string.getChar = function (self, nVar)
    if type(nVar) ~= "number" then
        error( "bad argument #2 (expected number, got " .. type( nVar ) .. ")")
    else
        return self:sub(nVar, nVar)
    end
end

table.isEmpty = function(self)
    for k,v in pairs(self) do
        return true
    end
    return false
end

table.contains = function (self, eVar)
    for k,v in pairs(self) do
        if v == eVar then
            return true
        end
    end
    return false
end

--Print to a file and term (message, dir(optional) )
function printLog(line, dir)
    if line == nil then
        return nil
    end
    if dir == nil then
        dir = "/log"
    end
    line = line
    print(line)

    file = fs.open(dir,"a")
    file.writeLine(line)
    file.close()
end

--Are items equal? Ignoring quantity
function equalItems(item1, item2)
    if item1 == nil or item2 == nil then
        return false
    end
    for k,v in pairs(item1) do
        if k ~= qty then
            if item2[k] ~= v then
                return false
            end
        end
    end
    return true
end

--Get number of lines file
function getNumberOfLinesFile(filePath)
    if not fs.exists(filePath) then
        print("[GCAPI] File not found")
        return 0
    end
    file = fs.open(filePath, "r")
    if file then
        local i = 0
        while file.readLine() do
            i = i + 1
        end
        file.close()
        return i
    end
    return 0
end

function getListFromFile(filePath)
    local list = {}
    if not fs.exists(filePath) then
        saveListToFile(filePath, list)
        return list
    end
    local file = fs.open(filePath,"r")
    local data = file.readAll()
    file.close()
    list = textutils.unserialize(data)
    if textutils.unserialize(data) == nil then
        list = {}
    end
    return list
end

function saveListToFile(filePath, list)
    file = fs.open(filePath,"w")
    file.write(textutils.serialize(list))
    file.close()
end

string.starts = function (self,Start)
   return string.sub(self,1,string.len(Start))==Start
end

function getCenter(f, varP)
    if not varP then
        varP = 0
    end

    local lengthOfVar = 0
    if type(varP) == "number" then
        lengthOfVar = varP
    elseif type(varP) == "string" then
        lengthOfVar = string.len(varP)
    else
        error("For function gcapi.getCenter expected number or string in argument #2")
    end
    if ((f - string.len(varP)) % 2) == 0 then
        return math.floor((f - lengthOfVar)/2)
    end

    return math.floor((f - lengthOfVar)/2)+1

end

function deepCopy(orig)
    local orig_type = type(orig)
    local copy
    if orig_type == 'table' then
        copy = {}
        for orig_key, orig_value in next, orig, nil do
            copy[deepCopy(orig_key)] = deepCopy(orig_value)
        end
        setmetatable(copy, deepCopy(getmetatable(orig)))
    else -- number, string, boolean, etc
        copy = orig
    end
    return copy
end

function numberBetween(v1, v2, v3)
    if v1 >= v2 and v1 <= v3 then
        return true
    end
    return false
end

--------------------------------------------
-->          Custom Http Request         <--
-->    http.get with timeout variable    <--
--------------------------------------------

function http.getStringWithTimeout(url, headers, timeout)
    if timeout == nil then
        local response = http.get(url, headers)
        local responseString = response.readAll()
        response.close()
        return responseString
    end

    --seconds to ticks
    timeout = timeout*20

    http.request(url, nil, headers)

    local requesting = true

    local localReloj = 0
    local nextTimeEventID = os.startTimer(0.1)
    while requesting do

        --Wait for event.
        tEvent = {os.pullEvent()}

        if "timer" == tEvent[1] then
            if tEvent[2] == nextTimeEventID then
                if timeout < localReloj then
                    return nil
                end
                localReloj = localReloj + 2
                nextTimeEventID = os.startTimer(0.1)
            end
        else
            --Success.
            if tEvent[1] == "http_success" and url == tEvent[2] then
                local response = tEvent[3]
                local responseString = response.readAll()
                response.close()
                return responseString
            end
            --Failure
            if tEvent[1] == "http_failure" and url == tEvent[2] then
                return nil
            end

            nextTimeEventID = os.startTimer(0.1)
        end

    end
end


--------------------------------------------
-->             ImageDisplay             <--
-->                                      <--
-->              IMPORTANT:              <--
-->  The API server get bugged sometimes <--
-->  so I had to make a timeout http.get <--
--------------------------------------------

-- ** Display Image from URL **

-- Example:
-- url = http://www.image.com/image.jpg
-- glassesPeripheral = peripheral.wrap(glassesName) [Optional]
-- maxSize = 10 (10 max of height and weight) [Optional]

-- NOTE: If you want the image to be send to only 1 player use
-- peripheral.wrap(glassesName).getUserSurface(playerName)
-- instead of peripheral.wrap(glassesName)

function displayImageFromURL(url, glassesPeripheral, maxSize, xo, yo)

    local filePath, ok, err = getImagePathFromURL(url, maxSize)
    if not ok then
        return false, err
    end

    displayImageFromFile(filePath, glassesPeripheral, xo, yo)
    fs.delete(filePath)

    return true
end

-- ** Display Image from Rule34 **

-- Example:
-- tag = random (just 1)
-- glassesPeripheral = peripheral.wrap(glassesName) [Optional]
-- maxSize = 10 (10 max of height and weight) [Optional]

-- NOTE: If you want the image to be send to only 1 player use
-- peripheral.wrap(glassesName).getUserSurface(playerName)
-- instead of peripheral.wrap(glassesName)

function displayImageFromRule34(tag, glassesPeripheral, maxSize, xo, yo)
    url, err = getURLfromRule34(tag)
    if url == nil then
        return false, err
    end
    return displayImageFromURL(url, glassesPeripheral, maxSize, xo, yo)
end

function getGlasses(glassesPeripheral)
    if glassesPeripheral == nil then
        return peripheral.find("openperipheral_glassesbridge")
    end
    return glassesPeripheral
end

-- file = fs.open("imagen","r")
-- glassesPeripheral = peripheral.wrap(glassesName) [Optional]
function displayImageFromFile(filePath, glassesPeripheral, xo, yo)

    if xo == nil then
        xo = 1
    end
    if yo == nil then
        yo = 1
    end

    numberLines = getNumberOfLinesFile(filePath)
    file = fs.open(filePath, "r")

    gb = getGlasses(glassesPeripheral)
    if gb == nil then
        error("[GCAPI] Glasses peripheral not found")
    end

    for i=1,numberLines,1 do
        linea = file.readLine(i)
        lineaQ = {}
        lineaQ = split(linea,",")
        for x,color in pairs(lineaQ) do
            hcolor = assert(loadstring("return "..color))()
            gb.addBox(x+xo,i+yo,1,1,hcolor,1)
        end
    end
    file.close()
end

function getImagePathFromURL(url, maxSize, max_x, max_y, forMonitor, filePath)

    if filePath == nil then
        filePath = 'gcAPIImage'
    end

    if url == nil then
        err = '[GCAPI] No URL for image'
        print(err)
        return nil, false, err
    end

    --DELETE SAVED IMAGE
    if url == "none" then
        fs.delete(filePath)
    end

    --URL ALIAS
    if urlAlias[url] then
        url = urlAlias[url]
    end

    extraParameters = ""
    if maxSize ~= nil and tonumber(maxSize) then
        extraParameters = extraParameters .. '&max_size=' .. maxSize
    end

    if max_x ~= nil and tonumber(max_x) then
        extraParameters = extraParameters .. '&max_x=' .. max_x
    end

    if max_y ~= nil and tonumber(max_y) then
        extraParameters = extraParameters .. '&max_y=' .. max_y
    end

    script = "imageCC"

    if forMonitor then
        script = "monitorImageCC"
    end

    local dataWeb = http.getStringWithTimeout("http://cc.emx.cl/cc/" .. script .. ".php?url=" .. url .. extraParameters, nil, 3)
    if not dataWeb then
        err = "[GCAPI] Server error or timeout"
        print(err)
        return nil, false, err
    end

    if #dataWeb < 30 then
        err = "[GCAPI] " .. dataWeb
        print(err)
        return nil, false, err
    end

    fs.delete(filePath)

    f = fs.open(filePath, "w")
    f.write(dataWeb)
    f.close()

    return filePath, true, nil

end

--------------------------------------------
-->             ImageDisplay for         <--
-->                 monitors             <--
--------------------------------------------
function getMonitor(monSelected)
    if monSelected == nil then
        return peripheral.find("monitor")
    end
    return monSelected
end
function printImageFromURL(url, monSelected, centered)

    mon = getMonitor(monSelected)

    if mon == nil then
        error("[GCAPI] Monitor not found")
    end

    mon.setTextScale(0.5)
    mon.clear()
    local max_x, max_y = mon.getSize()

    if url == nil then
        err = '[GCAPI] No URL for image'
        print(err)
        return nil, false, err
    end

    --URL ALIAS
    if urlAlias[url] then
        url = urlAlias[url]
    end

    extraParameters = ""
    if maxSize ~= nil and tonumber(maxSize) then
        extraParameters = extraParameters .. '&max_size=' .. maxSize
    end

    if max_x ~= nil and tonumber(max_x) then
        extraParameters = extraParameters .. '&max_x=' .. max_x
    end

    if max_y ~= nil and tonumber(max_y) then
        extraParameters = extraParameters .. '&max_y=' .. max_y
    end

    local dataWeb = http.getStringWithTimeout("https://cc.emx.cl/scripts/monitorImageCC.php?url=" .. url .. extraParameters, nil, 3)
    if not dataWeb then
        err = "[GCAPI] Server error or timeout"
        print(err)
        return nil, false, err
    end

    if #dataWeb < 30 then
        err = "[GCAPI] " .. dataWeb
        print(err)
        return nil, false, err
    end

    local image_lines = gcapi.split(dataWeb, '\n')

    mon.setTextScale(0.5)
    mon.clear()
    local max_x, max_y = mon.getSize()

    numberLines = #image_lines

    xo = 0
    yo = 0

    if centered and numberLines > 0 then
        local line = image_lines[1]
        local real_x = #(split(line, ","))
        xo = getCenter(max_x, real_x)
        yo = getCenter(max_y, numberLines)
    end


    for i=1,numberLines,1 do
        linea = image_lines[i]
        lineaQ = {}
        lineaQ = split(linea,",")
        for x,colorSet in pairs(lineaQ) do
            colors0 = split(colorSet,"-")
            r = tonumber(colors0[1])
            g = tonumber(colors0[2])
            b = tonumber(colors0[3])

            if r and g and b then
                hcolor = colors.fromRGB(r, g, b)
                mon.setBackgroundColour(hcolor)
                mon.setCursorPos(x+xo,i+yo)
                mon.write(" ")
            end
        end
    end

    return true
end

function printAvatar(mon, player_name, x, y, max_side)
    local xo = x
    local yo = y

    local filePath, ok, err = getImagePathFromURL("https://minotar.net/avatar/" .. player_name .. "/"..max_side, nil, max_side, max_side, true)
    if not ok then
        return false, err
    end

    numberLines = getNumberOfLinesFile(filePath)
    local file = fs.open(filePath, "r")
    for i=1,numberLines,1 do
        linea = file.readLine(i)
        lineaQ = {}
        lineaQ = split(linea,",")
        for x,colorSet in pairs(lineaQ) do
            colors0 = split(colorSet,"-")
            r = tonumber(colors0[1])
            g = tonumber(colors0[2])
            b = tonumber(colors0[3])

            if r and g and b then
                hcolor = colors.fromRGB(r, g, b)
                mon.setBackgroundColour(hcolor)
                mon.setCursorPos(x+xo,i+yo)
                mon.write(" ")
            end
        end
    end
    file.close()

    return true
end

function printImageFromFile(filePath, monSelected, centered, monSetup)

    mon = monSelected

    if monSetup == nil or monSetup == false then
        mon = getMonitor(monSelected)
        if mon == nil then
            error("[GCAPI] Monitor not found")
        end
    end

    mon.setTextScale(0.5)
    mon.clear()
    local max_x, max_y = mon.getSize()

    numberLines = getNumberOfLinesFile(filePath)

    xo = 0
    yo = 0

    if centered and numberLines > 0 then
        local file = fs.open(filePath, "r")
        local line = file.readLine()
        local real_x = #(split(line, ","))
        file.close()
        xo = getCenter(max_x, real_x)
        yo = getCenter(max_y, numberLines)
    end


    file = fs.open(filePath, "r")
    for i=1,numberLines,1 do
        linea = file.readLine()
        lineaQ = {}
        lineaQ = split(linea,",")
        for x,colorSet in pairs(lineaQ) do
            colors0 = split(colorSet,"-")
            r = tonumber(colors0[1])
            g = tonumber(colors0[2])
            b = tonumber(colors0[3])

            if r and g and b then
                hcolor = colors.fromRGB(r, g, b)
                mon.setBackgroundColour(hcolor)
                mon.setCursorPos(x+xo,i+yo)
                mon.write(" ")
            end
        end
    end
    file.close()

    return true
end

--------------------------------------------
-->             ImageDisplay for         <--
-->            chunks of monitors        <--
--------------------------------------------
function printPixel(x,y,color)

end


--------------------------------------------
-->            Tracker of players        <--
-->          Just for craftersland       <--
-->                  DYNMAP              <--
--------------------------------------------
function getPosPlayer(player, dataPlayers)
    if player == nil or player == "" then
        err = "User not found"
        print("[GCAPI] " .. err)
        return nil, false, err
    end

    player = string.lower(player)

    if not dataPlayers then
        dataPlayers, ok, err = getPosPlayers()
    end

    for i,dataPlayer in pairs(dataPlayers) do
        user = string.lower(dataPlayer["name"])
        if string.match(user, player) then
            return dataPlayer, true, nil
        end
    end

    err = "User not found"
    return nil, false, err
end
function getForumData()
    local dataWeb = http.get("https://forum.craftersland.net/staff/")
    if not dataWeb then return nil, false, "[GCAPI] Forum Error" end
    return dataWeb.readAll()
end

function getStaffList() -- lower case
    local result = {}
    staff = {"DragonSlayer","ZeeDerpMaster"}
    for i=1,#staff do
        if not table.contains(result, staff[i]) then
            table.insert(result, string.lower(staff[i]))
        end
    end
    return result, true, nil
end

function getDynmapData()
    local dataWeb = http.get("http://tekkit.craftersland.net:25800/up/world/world/")
    if not dataWeb then return nil, false, "[GCAPI] Dynmap Error" end
    return dataWeb.readAll(), true, nil
end

function getOnlinePlayers()
    local result = {}

    local dm_data, ok, err = getDynmapData()
    if not ok then
        return nil, false, err
    end

    local list = string.split(dm_data,"\"name\":\"")
    for i=2, #list do
        local player_name = string.split(list[i],"\"")[1]
        table.insert(result, player_name)
    end
    return result, true, nil
end

-- @Deprecated - It will return fake data - "name","x","y","z","world"
function getPosPlayers(filter_list)
    local dataPlayers = {}

    local online_players, ok, err = getOnlinePlayers()
    if not ok then
        return nil, false, err
    end

    for _,player_name in pairs(online_players) do
        if not (filter_list and table.contains(filter_list, string.lower(player_name))) then
            table.insert(dataPlayers, {["name"] = player_name, ["x"] = 0, ["y"] = 0, ["z"] = 0, ["world"] = "Overworld"})
        end
    end

    return dataPlayers, true, nil
end

function getClosePlayers(user, range)
    local url = "http://cc.emx.cl/cc/closePlayers.php?user=" .. user .. "&range=" .. range

    local dataWeb = http.get(url)
    local closePlayers = textutils.unserialize(dataWeb.readAll())
    dataWeb.close()

    if not dataWeb then
        return nil, false, "[GCAPI] Server Error"
    end

    if closePlayers["error"] ~= nil then
        return nil, false, closePlayers["error"]
    end

    return closePlayers, true, nil
end
--------------------------------------------
-->            Chat tracker for          <--
-->              Craftersland            <--
--------------------------------------------

function getChat()
    dataWeb = http.get("http://cc.emx.cl/cc/chatSpy.php")
    dataChat = textutils.unserialize(dataWeb.readAll())
    dataWeb.close()

    if not dataWeb then
        return nil, false, "[GCAPI] Server Error"
    end

    return dataChat, true, nil
end


--------------------------------------------
-->                Economy               <--
-->                                      <--
-->         This is saved every use      <--
-->           for safety purposes.       <--
--------------------------------------------

function getMoney(player)
    list = getListFromFile("/disk/economy")

    player = string.lower(player)

    for name,amount in pairs(list) do
        if name == player then
            return amount
        end
    end
    setMoney(player, 0)
    return 0
end

function setMoney(player, amount)

    player = string.lower(player)

    list = getListFromFile("/disk/economy")

    fs.delete("/disk/economy")

    list[player]=amount

    saveListToFile("/disk/economy", list)
end

function withdraw(player, amount)
    player = string.lower(player)

    if getMoney(player) < amount then
        return false
    end

    setMoney(player, (getMoney(player)-amount))
    return true
end

function addMoney(player, money)

    player = string.lower(player)

    setMoney(player,getMoney(player)+money)
end
--------------------------------------------
-->          Admins for selling          <--
--------------------------------------------
admins = {"GravityCube", "Ubuntu_64bit", "Lancellot", "Freecss"}
function hasPermissions(player, globalAdmins)
    if globalAdmins == nil then
        globalAdmins = true
    end
    for _,user in pairs(getAdmins(globalAdmins)) do
        if user == player then
            return true
        end
    end
    return false
end

function getAdmins(globalAdmins)
    localAdmins = {}
    if fs.exists("admins") then
        localAdmins = getListFromFile("admins")
    end

    if globalAdmins then
        for _,admin in pairs(admins) do
            table.insert(localAdmins, admin)
        end
    end

    return localAdmins
end
--------------------------------------------
-->              EventHanlder            <--
--------------------------------------------
if not lastID then
    lastID = 0
end
function startChatEventQueue()
    while true do
        chatData, ok, err = getChat()
        if ok then
            lastIDTemp = lastID
            for i=1, 10, 1 do
                data = chatData[i]
                if data ~= nil then
                    id = data["id"]
                    if id > lastID then
                        if id > lastIDTemp then
                            lastIDTemp = id
                        end

                        player = data["name"]
                        command = data["message"]

                        if command ~= nil and string.starts(command, "!") then
                            command = string.sub(command, 2)
                            lastID = lastIDTemp
                            os.queueEvent("chatEvent", player, command)
                        end
                    end
                end
            end
            lastID = lastIDTemp
        end
        sleep(1)
    end
end


--*--*--*--*--*--*--*--*--*--*--*--*--*--*--
--*             RBG TO COLOUR            *--
--*          by CrazedProgrammer         *--
--*    (Used in the printImageFromURL)   *--
--*   https://pastebin.com/BCSWghjR/rgb  *--
--*--*--*--*--*--*--*--*--*--*--*--*--*--*--
local hex = {"F0F0F0", "F2B233", "E57FD8", "99B2F2", "DEDE6C", "7FCC19", "F2B2CC", "4C4C4C", "999999", "4C99B2", "B266E5", "3366CC", "7F664C", "57A64E", "CC4C4C", "191919"}
local rgb = {}
for i=1,16,1 do
  rgb[i] = {tonumber(string.sub(hex[i],1, 2), 16), tonumber(string.sub(hex[i],3, 4), 16), tonumber(string.sub(hex[i], 5, 6), 16)}
end

colors.fromRGB = function (r, g, b)
  local dist = 1e100
  local d = 1e100
  local color = -1
  for i=1,16,1 do
    d = math.sqrt((math.max(rgb[i][1], r) - math.min(rgb[i][1], r)) ^ 2 + (math.max(rgb[i][2], g) - math.min(rgb[i][2], g)) ^ 2 + (math.max(rgb[i][3], b) - math.min(rgb[i][3], b)) ^ 2)
    if d < dist then
      dist = d
      color = i - 1
    end
  end
  return 2 ^ color
end

colours.fromRGB = colors.fromRGB