Could Use A Hand With Some Code

-- Preset Variables
server_id = 6 -- The ID of the server computer
modem_side = "right" -- The side your modem is on

-- Crap that has to be done first
rednet.open(modem_side)

-- Debug (Just in case I need to pre-set some variables)
debug = false
if debug == true then
end

-- Commands

function printstats()
term.clear()
term.setCursorPos(1,1)
print(" ============================================")
print("=   Class: ".. class .."   HP: "..hp.."   MP: "..mp.."   =")
print(" ============================================")
print("")
end

-- Start of Commands

function command_help()
term.clear()
term.setCursorPos(1,1)
printstats()
print("Help Page")
end

function command_inventory()
term.clear()
term.setCursorPos(1,1)
printstats()
print("Inventory Page")
end

-- end of commands

-- start of command handler
function commands()
if command == "/help" then
  command_help()
elseif command == "/inventory" then
  command_inventory()
else userexists("unknowncommand")
end
end
-- end of command handler



function getstats()
rednet.send(server_id, "getstats")
rednet.send(server_id, email)

id, email = rednet.receive()
id, username = rednet.receive()
id, class = rednet.receive()
id, maxhp = rednet.receive()
id, hp = rednet.receive()
id, maxmp = rednet.receive()
id, mp = rednet.receive()
id, age = rednet.receive()

printstats()
end

function userexists(error)
term.clear()
term.setCursorPos(1,1)
getstats()
print("Welcome Back!")
print("Type /help if you need help with anything")
print("")
if error == "unknowncommand" then
print("Unknown Command")
print("")
end
command = read()
commands()
end

-- start register function(s)

function writeplayer()
-- Line 1: Minecraft Email
-- Line 2: Game Username
-- Line 3: Class
-- Line 4: Max HP
-- Line 5: HP
-- Line 6: Max MP
-- Line 7: MP
-- Line 8: Age
print(email)
print(username)
print(class)
print(maxhp)
print(hp)
print(maxmp)
print(mp)
print(age)

rednet.send(server_id, "write_player_info")
rednet.send(server_id, email)
rednet.send(server_id, username)
rednet.send(server_id, class)
rednet.send(server_id, maxhp)
rednet.send(server_id, hp)
rednet.send(server_id, maxmp)
rednet.send(server_id, mp)
rednet.send(server_id, age)
end

function confirmplayer(error)
term.clear()
term.setCursorPos(1,1)
print("Is all of this correct? y/n")
print("")
print("Username: "..username)
print("Class: "..class)
print("Age: "..age)
print("")
if error == "unknowncommand" then
print("Unknown Command")
print("")
end
answer = io.read()
  if answer == "y" then
	writeplayer()
  elseif answer == "n" then
	register()
  else
	confirmplayer("unknowncommand")
  end
end

function chooseage()
term.clear()
term.setCursorPos(1,1)
print("How old is your player?")
age = read()
confirmplayer()
end

function rollstats()
  -- I need to work out a way to add HP to the base HP randomly. The end HP must be a number
  -- rounded to the nearest 50 (150, 200, 250, 300 etc). Any ideas?
  if class == "Warrior" then
	maxhp = 250 -- + math.random(1, 250) rounded to the nearest 50
  end
  if class == "Mage" then
	maxhp = 150
  end

  -- I need to do the same thing with MP as well.
  if class == "Warrior" then
	maxmp = 50
  end
  if class == "Mage" then
	maxmp = 150
  end

  hp = maxhp
  chooseage()
end

function classhelp()
term.clear()
term.setCursorPos(1,1)
print("======================================================== ")
print("=	 Warrior	 =   Base HP: 250   =   Base MP: 50   = ")
print("======================================================== ")
print("=	  Mage	   =   Base HP: 150   =   Base MP: 150  = ")
print("======================================================== ")
print("")
print("Press ENTER to continue")
answer = read()
chooseclass()
end

function chooseclass(error)
term.clear()
term.setCursorPos(1,1)
print("Note: nothing is saved in the database yet, so if you quit now you will loose all of your saved work.")
print("Please choose a class. If you need help with a class, type 'help class'.")
print("")
print("[w]arrior, [m]age")
print("")
  if error == "unknowncommand" then
	print("Unknown Command")
	print("")
  end

answer = io.read()
  if answer == "help class" then
	classhelp()
  elseif answer == "w" then
	class = "Warrior"
	rollstats()
  elseif answer == "m" then
	class = "Mage"
	rollstats()
  else
	chooseclass("unknowncommand")
  end
end

function verifyusername()
term.clear()
term.setCursorPos(1,1)
print("Is ".. username .." correct? Note: You may not change this later y/n")
answer = read()
if answer == "y" then
  term.clear()
  term.setCursorPos(1,1)
  print("Welcome to the game "..username..".")
  chooseclass()
elseif answer == "n" then
  register()
else
  function register()
end
end
end

function register()
term.clear()
term.setCursorPos(1,1)
print("Welcome! It appears this is your first time playing. Please enter the name of which you wish to be called. This will be your username when playing the game, and is how other players will identify you, although you will still login with your minecraft email.")
print("")
username = read()
verifyusername()
end

-- end register function

function checkuserexist()
  rednet.send(server_id, "does_user_exist")
  rednet.send(server_id, email)
  senderID, message = rednet.receive()
	if senderID == server_id and message == "true" then
	  userexists()
	elseif senderID == server_id and message == "false" then
	  register()
	else
	userexist()
	end
end

function login()
term.clear()
term.setCursorPos(1,1)
print("Minecraft Email: ")
email = read()

term.clear()
term.setCursorPos(1,1)
print("Minecraft Password: ")
password = read()

local mclogin = http.get("http://login.minecraft.net/?user=".. email .."&password=".. password .. "&version=13")
password = ("null")
mclogin = mclogin.readAll()
  if mclogin == "Bad login" then
	term.clear()
	term.setCursorPos(1,1)
	print("Failed to login: ".. mclogin)
	print("Press enter to continue")
	answer = read()
	login()
  else
  checkuserexist()
  end
end

term.clear()
term.setCursorPos(1,1)
print("Remember: almost everything is CaSe SeNsItIvE")
login()

rednet.open("right")

debug = true

while true do
senderID, message = rednet.receive()
  command = message

  if command == "does_user_exist" then
	senderID, message = rednet.receive()
	if fs.exists("users/"..message) == true then
	rednet.send(senderID, "true")
	else
	rednet.send(senderID, "false")
	end
  end

  if command == "write_player_info" then
	senderID, message = rednet.receive()
	email = message
	senderID, message = rednet.receive()
	username = message
	senderID, message = rednet.receive()
	class = message
	senderID, message = rednet.receive()
	maxhp = message
	senderID, message = rednet.receive()
	hp = message
	senderID, message = rednet.receive()
	maxmp = message
	senderID, message = rednet.receive()
	mp = message

	if debug == true then
	print("")
	print("received player info: ")
	print(email)
	print(username)
	print(class)
	print(maxhp)
	print(hp)
	print(maxmp)
	print(mp)
	end

	file = fs.open("/users/"..email, "w")
	file.writeLine(email)
	file.writeLine(username)
	file.writeLine(class)
	file.writeLine(maxhp)
	file.writeLine(hp)
	file.writeLine(maxmp)
	file.writeLine(mp)
	file.writeLine(age)
	file.close()
  end

  if command == "getstats" then
	senderID, message = rednet.receive()
	email = message

	file = fs.open("/users/"..email, "r")

	rednet.send(senderID, file.readLine(1))
	rednet.send(senderID, file.readLine(2))
	rednet.send(senderID, file.readLine(3))
	rednet.send(senderID, file.readLine(4))
	rednet.send(senderID, file.readLine(5))
	rednet.send(senderID, file.readLine(6))
	rednet.send(senderID, file.readLine(7))
	rednet.send(senderID, file.readLine(8))
  end