CCGames: terminalGlasses

--Initialising Variables
local users = {} --All
local num = 0
local p = peripheral.wrap("top")
local welcomeText = {{"Welcome to the"},{"ComputerCraft Games!"},{""},{"type $$next in chat to"},{"go to next screen"}}
local nextText = {{"This is the second"},{"page"},{""},{"Success!"}}

function displayText(text,surface)
    surface.clear()
    local longestString = 0
    for i = 1, #text do
        text[i][2] = p.getStringWidth(text[i][1])
        if text[i][2] > longestString then
            longestString = text[i][2]
        end
    end
    longestString = longestString + 2
    surface.addBox(0,0,longestString,1000,0xFFFFFF,0.5)
    local line = 1
    for i = 1, #text do
        local textX = math.floor((longestString - text[i][2])/2)
        surface.addText(textX,line,text[i][1],0x000000)
        line = line + 9
    end
end

function newUser()
    num = #p.getUsers()
    users[num] = {}
    users[num].name = p.getUsers()[num]
    users[num].surface = p.getUserSurface(p.getUsers()[num])
    displayText(welcomeText,users[num].surface)
end

function nextScreen(player)
    for i = 1, #users do
        if player == users[i].name then
            displayText(nextText,users[i].surface)
        end
    end
end

while true do
    os.queueEvent("wait")
    evt, p1, p2, p3 = os.pullEvent()
    if #p.getUsers() ~= #users then
        newUser()
    elseif evt =="chat_command" and #users > 0 and cmd == "sleep" then
        nextScreen(p2)
    else
        sleep(0)
        os.queueEvent("wait")
    end
end