[xOS] Accounts

--[[
Accounts File
Written by TheShadow989
]]--

os.pullEvent = os.pullEventRaw

local verNumber = "Alpha 1.24"
local nOption = 1
local z = 1
userfinal = {}
userlenght = {}

rRead = fs.open("xos/.usertable", "r")
users = textutils.unserialize(rRead.readAll())
rRead.close()
cu = tonumber(users[1])
cs = tonumber(users[cu+1])
cp = tonumber(users[cu+2])

if users[5] == nil then
    users[5] = "Empty"
end
if users[8] == nil then
    users[8] = "Empty"
end
if users[11] == nil then
    users[11] = "Empty"
end

userlenght[1] = string.len(users[2])
userlenght[2] = string.len(users[5])
userlenght[3] = string.len(users[8])
userlenght[4] = string.len(users[11])

for i=2, 11, 3 do
    if userlenght[z] == 9 then
        userfinal[z] = ""..users[i]..""
    elseif userlenght[z] == 8 then
        userfinal[z] = ""..users[i].." "
    elseif userlenght[z] == 7 then
        userfinal[z] = " "..users[i].." "
    elseif userlenght[z] == 6 then
        userfinal[z] = " "..users[i].."  "
    elseif userlenght[z] == 5 then
        userfinal[z] = "  "..users[i].."  "
    elseif userlenght[z] == 4 then
        userfinal[z] = "  "..users[i].."   "
    elseif userlenght[z] == 3 then
        userfinal[z] = "   "..users[i].."   "
    elseif userlenght[z] == 2 then
        userfinal[z] = "   "..users[i].."    "
    elseif userlenght[z] == 1 then
        userfinal[z] = "    "..users[i].."    "
    end
    z = z + 1
end

local w,h = term.getSize()

local function drawMenu()
    local time = os.time()
    local formattedTime = textutils.formatTime(time, false)

    term.clear()
    term.setCursorPos(1,1)
    term.write("Logged in as: ")
    term.setTextColor( colors.red )
    term.write(""..users[cu].."")
    term.setTextColor( colors.white )
    term.setCursorPos(1,2)
    write(formattedTime)
    term.setCursorPos(1,19)
    term.write("xOS "..verNumber.." by TheShadow989")

    term.setCursorPos(w-11,1)

    if nOption == 1 then
        term.write(""..users[2].."")
    elseif nOption == 2 then
        term.write(""..users[5].."")
    elseif nOption == 3 then
        term.write(""..users[8].."")
    elseif nOption == 4 then
        term.write(""..users[11].."")
    elseif nOption == 5 then
        term.write("Remove")
    elseif nOption == 6 then
        term.write("Back")
    end
end

function printCentered(y,s)
    local x = math.floor((w - string.len(s)) / 2)
    term.setCursorPos(x,y)
    term.clearLine()
    term.write( s )
end

term.clear()

local function drawFrontend()
    printCentered( math.floor(h/2) - 4, "")
    printCentered( math.floor(h/2) - 3, "Accounts" )
    printCentered( math.floor(h/2) - 2, "")
    printCentered( math.floor(h/2) - 1, ((nOption == 1) and "["..userfinal[1].."]") or userfinal[1] )
    printCentered( math.floor(h/2) + 0, ((nOption == 2) and "["..userfinal[2].."]") or userfinal[2] )
    printCentered( math.floor(h/2) + 1, ((nOption == 3) and "["..userfinal[3].."]") or userfinal[3] )
    printCentered( math.floor(h/2) + 2, ((nOption == 4) and "["..userfinal[4].."]") or userfinal[4] )
    printCentered( math.floor(h/2) + 3, "")
    printCentered( math.floor(h/2) + 4, ((nOption == 5) and "[ Remove  ]") or " Remove  " )
    printCentered( math.floor(h/2) + 5, ((nOption == 6) and "[  Back   ]") or "  Back   " )
end

local function errormsg()
    local time = os.time()
    local formattedTime = textutils.formatTime(time, false)

    term.setCursorPos(1,1)
    term.write("Logged in as: ")
    term.setTextColor( colors.red )
    term.write(""..users[cu].."")
    term.setTextColor( colors.white )
    term.setCursorPos(1,2)
    write(formattedTime)
    term.setCursorPos(1,19)
    term.write("xOS "..verNumber.." by TheShadow989")
    term.setCursorPos(w-11,1)


     if nOption == 1 then
        term.write(""..users[2].."")
    elseif nOption == 2 then
        term.write(""..users[5].."")
    elseif nOption == 3 then
        term.write(""..users[8].."")
    elseif nOption == 4 then
        term.write(""..users[11].."")
    end

    term.setCursorPos(11,8)
    term.setTextColor( colors.red )
    write("This slot is already occupied!")
    term.setTextColor( colors.white )
    sleep(2)
    shell.run("xos/.accounts")
end

drawMenu()
drawFrontend()

while true do
    local e,p = os.pullEvent()
    if e == "key" then
        local key = p
        if key == 17 or key == 200 then
            if nOption > 1 then
                nOption = nOption - 1
                drawMenu()
                drawFrontend()
            end
        elseif key == 31 or key == 208 then
            if nOption < 6 then
                nOption = nOption + 1
                drawMenu()
                drawFrontend()
            end
        elseif key == 28 then
            break
        end
    end
end

term.clear()

if nOption  == 1 then
    errormsg()
elseif nOption == 2 then
    if users[5] == "Empty" then
        shell.run("xos/.addaccounts")
    else
        errormsg()
    end
elseif nOption == 3 then
    if users[8] == "Empty" then
        shell.run("xos/.addaccounts")
    else
        errormsg()
    end
elseif nOption == 4 then
    if users[11] == "Empty" then
        shell.run("xos/.addaccounts")
    else
        errormsg()
    end
elseif nOption == 5 then
    shell.run("xos/.removeaccounts")
elseif nOption == 6 then
    shell.run("back")

end