[xOS] Startup

--[[
Startup File
Written by TheShadow989
]]--

os.pullEvent = os.pullEventRaw
os.loadAPI("xos/api/sha256")

local verNumber = "Alpha 1.24"
local tries = 1

rRead = fs.open("xos/.usertable", "r")
users = textutils.unserialize(rRead.readAll())
rRead.close()

local x = term.getSize()

local function cPrint(string)
        x, _ = term.getSize()
        _, y = term.getCursorPos()
        term.setCursorPos((x-#string)/2,y)
        textutils.slowPrint(string)
end

--if users[5] == nil and users[8] == nil and users[11] == nill then
    --shell.run("xos/.firsttime")
--end

term.clear()
term.setCursorPos(1,19)

term.write("xOS "..verNumber.." by TheShadow989")

term.setCursorPos(1,2)

cPrint("xOS "..verNumber)
sleep(1)

while true do
    if tries == 4 then
        term.setCursorPos(1,8)
        term.clearLine()
        term.setCursorPos(22,10)
        term.clearLine()
        write("LOCKED")
        sleep(120)
        tries = 1
        term.clearLine()
    end

    term.setCursorPos(17,8)
    term.clearLine()
    write("Username: ")
    term.setCursorPos(17,10)
    term.clearLine()
    write("Password: ")
    term.setCursorPos(27,8)
    user = read()
    term.setCursorPos(27,10)
    pass = read('*')

    pass = sha256.sha256(pass)

    for i=2, #users, 3 do
        if user == users[i] and pass == users[i + 2] then
            users[1] = ""..i..""
            access = true
        end
    end

    tries = tries + 1

    if access == true then
        break
    end

    if tries ~= 4 then
        term.setCursorPos(5,14)
        term.setTextColor( colors.red )
        write("Incorrect username and password combination.")
        term.setTextColor( colors.white )
        sleep(3)
        term.clearLine()
    end
end


term.setCursorPos(19,14)
write("Logging in...")
term.setCursorPos(16,15)
write("[                ]")
term.setCursorPos(17,15)
write("###")
sleep(0.5)
term.setCursorPos(20,15)
write("###")
sleep(1)
term.setCursorPos(23,15)
write("#####")
sleep(0.2)
term.setCursorPos(28,15)
write("##")
sleep(1)
term.setCursorPos(30,15)
write("###")
sleep(0.5)

rWrite = fs.open("xos/.usertable", "w")
rWrite.write(textutils.serialize(users))
rWrite.close()
shell.run(".menu")