--APIs
os.pullEvent = os.pullEventRaw
os.loadAPI("/DZSystem/API/Color")

--Variables
local quit, user, registered = false
local name, pass, passCnfrm = nil
local usersDir = "/DZSystem/users/"
local regStr = "Registration"
local authStr = "Authorization"
local program = "V 1.0"

--Functions
local function clr(color,str)
  term.setBackgroundColor(color)
  term.setCursorPos(1,1)
  term.clear()
  print(str)
  for i=1,50 do
        if i == 50 then
          print("-")
        else
          write("-")
        end
  end
end

repeat
clr(Color.Lime,program)
print("Do you have account?")
print("Y\N")
local event, key = os.pullEvent()
until (key == keys.y) or (key == keys.n)
if key == keys.y then
--Begin Registration
  repeat --begin
        clr(Color.Lime,regStr)
        write("Enter your name: ")
        name = read()
        user = fs.exists(usersDir..name)
        if user == true then
          clr(Color.Lime,regStr)
          print("User already registered!")
          print("Try another name.")
          sleep(1)
        else
          quit = true
        end
  until quit == true --end
        quit = false
        print("Ok!")
        sleep(1)
        quit = true
  repeat --begin
        clr(Color.Lime,regStr)
        write("Enter your password: ")
        pass = read("*")
        write("Confirm your password: ")
        passCnfrm = read("*")
        if pass == passCnfrm then
          print("Ok!")
          sleep(1)
          quit = true
        else
          quit = false
          clr(Color.Lime,regStr)
          print("Incorrect password!")
          sleep(1)
        end
  until quit == true --end
  file = fs.open(usersDir..name,"a")
  --file.writeLine(name)
  file.writeLine(pass)
  file.close()
  sleep(2)
--End Registration
else
--Begin Authorization
  quit = false

  repeat --begin
        clr(Color.Lime,authStr)
        write("Enter your name: ")
        name = read()
        user = fs.exists(usersDir..name)
        if user == true then
          print("Ok!")
          file = fs.open(usersDir..name,"r")
          passCnfrm = file.readLine()
          file.close()
          sleep(1)
          quit = true
        else
          clr(Color.Lime,authStr)
          print("User is not exists! Try again.")
          sleep(1)
        end
  until quit == true --end
  quit = false
  repeat
        clr(Color.Lime,authStr)
        write("Enter your password: ")
        pass = read()
        if pass == passCnfrm then
          print("Ok!")
          sleep(3)
          quit = true
        else
          clr(Color.Lime,authStr)
          print("Incorrect password!")
          sleep(1)
        end
  until quit == true
end