local user=""
local locked=false
-- functions for making read only values

function version()
	return "1.21"
end

function sprint(text)
  textutils.slowPrint(text)
end

function waitForKey()
	while true do
		event, param = os.pullEvent()
		if event == "key" then
            break
		end
	end
	return param
end

function setUser(sUser)
	if not locked then user=sUser end
	locked=true
end

function getUser()
	return user
end

function reading()
  sleep(0.5)
  write "."
end

function showLogo()
	term.clear()
	term.setCursorPos(1,1)
	print("   " .. os.version() .. " with Redworks "..redworks.version().." Terminal ID# " .. os.getComputerID())
	print("   _ \\            |                    |        ")
	print("     /   -_)   _' | \\ \\  \\ /  _ \\   _| | / (_-< ")
	print("  _|_\\ \\___| \\__,_|  \\_/\\_/ \\___/ _|  _\\_\\ ___/ ")
	print("    Development Team at http://redworksos.com")
end

function showLogo2()
    term.clear()
    print"@@@@@@@  @@@@@@@@ @@@@@@@"
	print"@@!  @@@ @@!      @@!  @@@"
	print"@!@!!@!  @!!!:!   @!@  !@!"
	print"!!: :!!  !!:      !!:  !!!"
	print"::   : : : :: ::  :: :::"
	print"@@@  @@@  @@@  @@@@@@  @@@@@@@  @@@  @@@  @@@@@@"
	print"@@!  @@!  @@! @@!  @@@ @@!  @@@ @@!  !@@ !@@"
	print"@!!  !!@  @!@ @!@  !@! @!@!!@!  @!@@!@!   !@@!!"
	print" !:  !!:  !!  !!:  !!! !!: :!!  !!: :!!      !:!"
	print"  ::.:  :::    : :. :   :   : :  :   ::: ::.: : "
end

function doLogin() --returns true if login succeeds, false if it fails
	local sPasswdPath = "ACCOUNTS.F"
	--check we have a login path, if not, what we enter will create the account instead of log in
	if fs.exists( sPasswdPath ) then--Password exists so this is not the first run
		local loginCount=0
		while loginCount < 3 do
			local tPasswd={}
			local file = fs.open(sPasswdPath,"r")
			local sLine = file:readLine()
			while sLine do
				for k, v in string.gmatch(sLine, "(%w+)%s(%w+)") do
					tPasswd[k]=v
				end
				sLine = file:readLine()
			end
			file:close()
			numItems = 0
			for k,v in pairs(tPasswd) do
				numItems = numItems + 1
			end

			if (numItems==0) then
				--no passwords, not first run, so exit with out login.
				print(" ")
				print("To secure this terminal use:\n\nadduser username password")
				sleep(3)
				return "",true
			end
			local ux,uy,px,py=8,8,8,10
			local size,len = 2,10
			rawWriteLoc(ux,uy,"Username:")
			rawWriteLoc(px,py,"Password:")
			textBox(ux+10,uy-1,len,size,false,false,"",true)
			textBox(px+10,py-1,len,size,false,true,"",true)
			local enterPressed = false
			local username,password="",""
			while not enterPressed do
				username, enterPressed=textBox(ux+10,uy-1,len,size,true,false,username,true)
				password, enterPressed=textBox(px+10,py-1,len,size,true,true,"",true)
			end
			if (tPasswd[username]==password) then --Login ok
				return username,true
			else --invalid login
				loginCount=loginCount+1
				rawWriteLoc(ux+10,7,"Invalid login")
			end
		end
		return "",false
	else--This is the first run, ask if they want to secure this box.
		local iSelected, sText = selectWindow(nil,nil,"Lock Terminal",{"Yes","No"})
		clearArea(16,6,17,7)
		local userFocus=true
		if (sText=="Yes") then
			local passwordMatch=false
			local username,password,password2="",""
			while not passwordMatch do
				local ux,uy=12,8
				local px,py=ux,10
				local size,len = 2,10
				rawWriteLoc(ux,uy,"Username:")
				rawWriteLoc(px,py,"Password:")
				rawWriteLoc(px,py+2,"Re-enter:")
				textBox(ux+10,uy-1,len,size,false,false,"xlilcasper",true)
				textBox(px+10,py-1,len,size,false,true,"",true)
				textBox(px+10,py+1,len,size,false,true,"",true)
				local enterPressed = false

				while not enterPressed do
					username, enterPressed=textBox(ux+10,uy-1,len,size,userFocus,false,username,true)
					password, enterPressed=textBox(px+10,py-1,len,size,true,true,"",true)
					password2, enterPressed=textBox(px+10,py+1,len,size,true,true,"",true)
				end
				if (password == password2) then
					passwordMatch = true
				else
					userFocus=false
					rawWriteLoc(ux+1,7,"Passwords do not match")
				end
			end
			--Our passwords match, store them for later.
				tPasswd={}
				tPasswd[username]=password

				local file = io.open(sPasswdPath,"w")
				for user,pass in pairs(tPasswd) do
					file:write(user .. " " .. pass .."\n")
				end
				file:close()
				return username,true
		else --Do not secure
			local file = io.open(sPasswdPath,"w")
			file:close()
			return "",true
		end
	end
end

--Helper functions

--XLC (XLilCaspers) Windows libary included with permissions. Access with redworks.showWindow, redworks.textBox, redworks.selectWindow...
function rawWriteLoc(x,y,sText)
	term.setCursorPos(x,y)
	term.write(sText)
end

function textBox(x,y,len,size,focus,hideChar,default,disableTerm)
	local h=2
	local w=len+3
	local char=""
	local line=""
	if size==1 then
		y=y
		w=len
		for tx=0,w do
			rawWriteLoc(x+tx,y,"_")
		end
	elseif size==2 then
		for tx=0,w do
			rawWriteLoc(x+tx,y+2,"-")
		end
	else
		for ty=0,h do
			for tx=0,w do
				char=" "
				if (ty==0) or (ty==h) then --horizonal line
					if (tx==0 or tx==w) then
						char="+"
					else
						char="-"
					end
				elseif (ty==1) then
					if (tx==0 or tx==w) then
						char="|"
					end
				else--normal line
					if (tx==0 or tx==w) then
						char="|"
					end
				end
			line=line..char
			end
			rawWriteLoc(x,y+ty,line)
			line=""
		end
	end

	if (focus) then
		if size==2 then
			y=y+1
			len=len+3
		elseif size==3 then
			x=x+2
			y=y+1
		end
		term.setCursorPos(x,y)
		term.setCursorBlink(true)
		sText=default or ""
		rawWriteLoc(x,y,sText)
		bExit = false
		local dispText=""
		local clearChar=" "
		if size==1 then clearChar="_" end
		local falt, sEvent, param = nil,nil,nil
		while not bExit do
			if disableTerm then
				falt, sEvent, param = pcall(os.pullEvent)
			else
				sEvent, param = os.pullEvent()
				falt=false
			end

			if sEvent == "key" then
				if param == 28 then
					return sText,true
				elseif param==15 then
					return sText,false
				elseif param == 14 then
					sText = string.sub(sText,1,string.len(sText)-1)
				end
			end

			if sEvent == "char" then
				sText = sText .. param
			end

			local dispChars=string.len(sText)
			if dispChars > len then dispChars=len end
			if not hideChar then
				dispText = string.sub(sText,-len)
			else
				dispText=""
				for n=1,dispChars do
					dispText=dispText.."*"
				end
				dispText = string.sub(dispText,-len)
			end
			dispChars=string.len(dispText)
			for n=dispChars,len do
				dispText=dispText..clearChar
			end
			rawWriteLoc(x,y,dispText)
			term.setCursorPos(x+dispChars,y)
		end
	else
		return sText,true
	end
end

function tCopy (tOrig, tTwin)
if not tTwin then tTwin = { } end
local tStack = {{tOrig, tTwin}}
local function copy (tTable, tTarget)
if not getmetatable(tTarget) then setmetatable(tTarget, getmetatable(tTable)) end
for k, v in pairs(tTable) do
if type(v)~='table' then
tTarget[k] = v
else
tTarget[k] = { }
table.insert(tStack, {tTable[k], tTarget[k]})
end
end
end
while #tStack>0 do
copy(tStack[1][1], tStack[1][2])
table.remove(tStack, 1)
end
return tTwin
end

function showWindow(x,y,w,h,title,text)
	local sTitle = title or ""
	local sText = text or ""
	width, height = term.getSize()
	sTitle = string.sub(sTitle,1,w-2)
	iTitleStart = ((w/2)-1)-((#sTitle-1)/2)
	if (not x) then
		x=(width-w)/2
	end
	if (not y) then
		y=(height-h)/2
	end
	if (w > width) then w = width end
	if (h > height) then h = height end
	local line=""
	local char=""
	local curChar=1
	local waitForLine=1
	if (sTitle ~= "") then waitForLine = 2 end
	for ty=0,h do
		for tx=0,w do
			char=" "
			if (ty==0) or ((ty==2) and (sTitle ~= "")) or (ty==h) then --horizonal line
				if (tx==0 or tx==w) then
					char="+"
				else
					char="-"
				end
			elseif (ty==1) then
				if (tx==0 or tx==w) then
					char="|"
				else
					--if (tx-iTitleStart < #sTitle+1) and (tx > iTitleStart) then
					--	char = string.sub(sTitle,tx-iTitleStart,tx-iTitleStart)
					--end
				end
			else--normal line
				if (tx==0 or tx==w) then
					char="|"
				end
			end
		line=line..char
		end
		rawWriteLoc(x,y+ty,line)
		line=""
	end
	if (sTitle ~= "") then
		rawWriteLoc(x+iTitleStart+1,y+1,sTitle)
	end
	if (sText ~= "") then
		term.setCursorPos(x+1,y+3)
		local wrapedText = getWrapedText(x+1,y+2,x+w-2,y+h-1,sText)
		local offset = 0
		if (sTitle ~= "") then offset=2 end
		for ty=1,#wrapedText do
			rawWriteLoc(x+1,ty+y+offset,wrapedText[ty])
			if (ty>h-offset-2) then break end
		end
	end
end

function getWrapedText(sx,sy,w,h, sText )
	local x,y = sx,sy
	local line = ""
	local wraped = { }
	local function newLine()
		table.insert(wraped,line)
		line=""
		x=sx
	end

	local function storeText(text)
		line=line..text
		return #text
	end

	-- Print the line with proper word wrapping
	while string.len(sText) > 0 do
		local whitespace = string.match( sText, "^[ \t]+" )
		if whitespace then
			-- Print whitespace
			x = x + storeText(whitespace)
			sText = string.sub( sText, string.len(whitespace) + 1 )
		end

		local newline = string.match( sText, "^\n" )
		if newline then
			-- Print newlines
			newLine()
			sText = string.sub( sText, 2 )
		end

		local text = string.match( sText, "^[^ \t\n]+" )
		if text then
			sText = string.sub( sText, string.len(text) + 1 )
			if string.len(text) > w then
				-- Print a multiline word
				while string.len( text ) > 0 do
				if x > w then
					newLine()
				end
					x = x + storeText( text )
					text = string.sub( text, (w-x) + 2 )
				end
			else
				-- Print a word normally
				if x + string.len(text) > w then
					newLine()
				end
				x = x + storeText( text )
			end
		end
	end
	newLine()
	return wraped
end

function selectWindow(x,y,title,tOptions,iSelected)
	local w=#title
	local h=1
	local selected=iSelected or 1
	local tOptionsOrg=tCopy(tOptions)
	local width, height = term.getSize()
	for n=1,#tOptions do
		tOptions[n]=" "..tOptionsOrg[n].."  "
		if (string.len(tOptions[n])>w) then w=string.len(tOptions[n]) end
	end
	w=w+2
	local sTitle = title or ""
	if (sTitle ~= "") then h = h + 2 end
	h = h + #tOptions
	tOptions[selected]="*"..tOptionsOrg[selected].."*"
	if (not x) then
		x=(width-w)/2
	end
	if (not y) then
		y=(height-h)/2
	end
	showWindow(x,y,w,h,sTitle,table.concat(tOptions,"\n"))

	--loop and capture arrow keys for selecting output.
	bExit = false
	while not bExit do
		event, param = os.pullEvent()
		if event == "key" then
			if param == 197 then --Exit on pause/break
				bExit = true
			elseif param == 208 then
				tOptions[selected]=" "..tOptionsOrg[selected].."  " --Clear selection
				selected=selected+1
				if (selected>#tOptions) then selected=1 end
				tOptions[selected]="*"..tOptionsOrg[selected].."*"
				showWindow(x,y,w,h,sTitle,table.concat(tOptions,"\n"))
			elseif param == 200 then
				tOptions[selected]=" "..tOptionsOrg[selected].."  " --Clear selection
				selected=selected-1
				if (selected<1) then selected=#tOptions end
				tOptions[selected]="*"..tOptionsOrg[selected].."*"
				showWindow(x,y,w,h,sTitle,table.concat(tOptions,"\n"))
			elseif param == 28 then
				return selected,tOptionsOrg[selected]
			end
		end

	end
end

function clearArea(x,y,w,h,char)
	local sChar = char or " "
	for yy=0,h do
		for xx=0,w do
			rawWriteLoc(x+xx,y+yy,sChar)
		end
	end
end

--End of windows libary

function class(base, init)
   local c = {}    -- a new class instance
   if not init and type(base) == 'function' then
      init = base
      base = nil
   elseif type(base) == 'table' then
    -- our new class is a shallow copy of the base class!
      for i,v in pairs(base) do
         c[i] = v
      end
      c._base = base
   end
   -- the class will be the metatable for all its objects,
   -- and they will look up their methods in it.
   c.__index = c

   -- expose a constructor which can be called by <classname>(<args>)
   local mt = {}
   mt.__call = function(class_tbl, ...)
   local obj = {}
   setmetatable(obj,c)
   if init then
      init(obj,...)
   else
      -- make sure that any stuff from the base class is initialized!
      if base and base.init then
      base.init(obj, ...)
      end
   end
   return obj
   end
   c.init = init
   c.is_a = function(self, klass)
      local m = getmetatable(self)
      while m do
         if m == klass then return true end
         m = m._base
      end
      return false
   end
   setmetatable(c, mt)
   return c
end
-----------EXTRA----------

--[[ (( Rin API ))

Usage: Just use the following information to utilize the available commands

:::Functions:::

 ENTITY

[entity.new( Name, X, Y, Text, Visibility, Physical )] returns Integer ID
Creates a new entity
Name;String -- Entity Name -- Currently only usable via entity.getvar() and entity.setvar()
X;Integer -- Entity X Position
Y;Integer -- Entity Y Position
Text;String -- The text on-screen that represents the entity
Visibility;Bool -- Whether or not the entity is drawn
Physical;Bool -- Whether or not the entity is a physical entity -- Currently only changeable via entity.getvar() and entity.setvar()
Note: Physical entities are unable to move to the position of other physical entities, but can be created at the same position, watch out.

[entity.setpos(ID, x, y, r)] -- ID is the returned value of entity.new()
Sets the position of entity ID to position x, y
Or, if r is set to true, sets position relative to current position
entity.setpos(ID, 3, 0, r) would add 3 to ID's x position, and 0 to ID's y position

[entity.setchar(ID, Text)]
Changes the character, or group of characters, that represent the entity on-screen

[entity.setvis(ID, Bool)]
Sets whether the entity is visible on-screen

[entity.setabs(ID, Bool)]
Sets whether the entity's position is absolute( x:1 y:1 remains the same regardless of screen position. Useful for GUI )

[entity.addvar(ID, Var, Value)]
Creates a new variable named Var of value Value to the entity ID
Var:String -- Variable Name
Value:Any -- Variable Value

[entity.setvar(ID, Var, Value)]
Sets the value of the variable Var to the value Value on the entity ID

[entity.getvar(ID, Var)]
Returns the value of the variable Var on the entity ID

[entity.getposx(ID)]
Returns the X position of the entity ID

[entity.getposy(ID)]
returns the Y position of the entity ID

[entity.remvar(ID, Var)]
Removes the variable Var from the entity ID

 GET

[get.locphys(x, y)]
Checks if there is a physical entity at position x,y
returns physical entity's ID, otherwise returns false

 EXECUTABLE

[exec.quit()]
Ends the current execution

[exec.draw()]
Draws the screen -- Runs automatically if a custom exec.update isn't set

[exec.update()]
User defined;
Runs every step, exec.update() overrides exec.defupdate(), which is the default update function
If you update yourself, you need to run exec.draw() or create your own drawing procedure

[exec.start()]
Starts the execution, nothing will be executed beyond this point until exec.stop() is called!

[exec.beginstep()] [exec.step()] [exec.endstep()]
User defined;
These are run every step, and in the order seen above.
This is a good place to put any sort of logic or conditional checks.

[exec.key(k)]
User defined;
This is run when a key is pressed, and the argument k contains the code for the key.
Find the Key Codes here; http://www.minecraftwiki.net/wiki/Key_Codes

[exec.quit]
Ends the execution, returning to the command line.

:::Variables:::

window.w -- Window Width
window.h -- Window Height
window.midw -- Center of the Window Width
window.midh -- Center of the Window Height

screen.x -- Screen x offset
screen.y -- Screen y offset

:::Entity Variables:::
These are the default Entity variables, found with entity.getvar()
'Name' -- String -- Entity's name, which you set when making a new entity
'X Position' -- Integer -- Entity's X Position
'Y Position' -- Integer -- Entity's Y Position
'Character' -- String -- The string that represents the entity on-screen
'Visibility' -- Bool -- Defines whether an entity is drawn on-screen
'Physical' -- Bool -- Defines whether an entity is physical or not
'Absolute' -- Bool -- Defines whether an entity's location is absolute;
Position (1,1) is the top left corner of the screen at all times if this is true for the object
'Variable Count' -- Integer -- Defines how many variables the entity has :::DO NOT CHANGE:::

]]--

window = {}
window.w,window.h = term.getSize()
window.midw = window.w/2
window.midh = window.h/2

screen = {}

screen.x = 0
screen.y = 0

--[[ ENTITY VARIABLES AND FUNCTIONS ]]--
entity = {}
entitynum = 1

function entity.new(a, x, y, t, c, d) -- Adds a new Entity to the execution
	id = entitynum
	entity[id] = {}

	entity[id][1] = {}
	entity[id][1][1] = 'Name'
	entity[id][1][2] = a

	entity[id][2] = {}
	entity[id][2][1] = 'X Position'
	entity[id][2][2] = x -- XPos

	entity[id][3] = {}
	entity[id][3][1] = 'Y Position'
	entity[id][3][2] = y -- YPos

	entity[id][4] = {}
	entity[id][4][1] = 'Character'
	entity[id][4][2] = t -- Text Representing the Entity

	entity[id][5] = {}
	entity[id][5][1] = 'Visibility'
	entity[id][5][2] = c -- Depicts whether the object is visible or not

	entity[id][6] = {}
	entity[id][6][1] = 'Physical'
	entity[id][6][2] = d -- If an object is Physical, it cannot move onto the same spot as a physical object
						 -- WARNING: Objects can still be set to physical using entity.setvar(), or by creating an object at the same spot as another object!

	entity[id][7] = {}
	entity[id][7][1] = 'Absolute'
	entity[id][7][2] = false -- Sets whether an object has an absolute position(1 = 1 on screen regardless of screen offset) or not

	entity[id][8] = {}
	entity[id][8][1] = 'Variable Count'
	entity[id][8][2] = 7 -- Counts how many variables there are

	entitynum = entitynum+1
	return id
end

function entity.setchar(a, b)
	entity[a][4][2] = b
end

function entity.setphys(a, b)
	entity[a][5][2] = b
end

function entity.setabs(a, b)
	entity[a][7][2] = b
end

function entity.addvar(a, b, c) -- Adds a new variable to an Entity
	varcount = entity[a][8][2] + 1
	entity[a][varcount] = {}
	entity[a][varcount][1] = b
	entity[a][varcount][2] = c
	entity[a][8][2] = varcount
end

function entity.remvar(a, b)
	for i in ipairs(entity[a]) do
		if entity[a][i][1] == b then
			table.remove(entity[a], i)
			entity[a][8][2] = entity[a][8][2] - 1
			break
		end
	end
end

function entity.setvar(a, b, c)
	for i in ipairs(entity[a]) do
		if entity[a][i][1] == b then
			entity[a][i][2] = c
			break
		end
	end
end

function entity.getvar(a, b)
	answer = 0
	for i in ipairs(entity[a]) do
		if entity[a][i][1] == b then
			answer = entity[a][i][2]
			break
		end
	end
	return answer
end


function entity.rem(a) -- Removes Entity from the execution
	--Don't know if this is possible or not. Might just zero out the entity. Reason? table.remove() would shift all the higher index entities down, changing their ID's
end

function entity.getposx(a) return entity[a][2][2] end
function entity.getposy(a) return entity[a][3][2] end

function entity.setpos(a, x, y, r) -- Sets the Entity's Position
	if r ~= nil then
		local resx = entity[a][2][2] + x
		local resy = entity[a][3][2] + y
		if get.locphys(resx,resy) == false then
			entity[a][2][2] = resx
			entity[a][3][2] = resy
		end
	else
		if get.locphys(x,y) == false then
			entity[a][2][2] = x
			entity[a][3][2] = y
		end
	end
end

--[[ GET FUNCTIONS ]]--
get = {}

function get.locphys(x, y)
	answer = false
	for i,v in ipairs(entity) do
		if entity[i][6][2] then
			if entity[i][2][2] == x then
				if entity[i][3][2] == y then
					answer = i
					break
				end
			end
		end
	end
	return answer
end

--[[ SCREEN FUNCTIONS ]]--
function printCenter( y, s ) -- Prints centered text on the screen
	local x = math.floor((w - string.len(s)) / 2)
	term.setCursorPos(x, y)
	term.clearLine()
	term.write( s )
end

--[[ RUNTIME ]]--
--Variables
exec = {}
exec.active = false
--Functions
function exec.quit() -- Ends the current execution
	term.clear()
	exec.active = false
	term.setCursorPos(window.midw-7,window.h)
	term.write('Thanks for using the RinAPI')
	sleep(2)
	term.clear()
	term.setCursorPos(1,1)
end

function exec.draw() -- Draws the screen
	term.clear()
	for i,v in ipairs(entity) do
		if entity[i][5][2] == true and entity[i][7][2] == false then
			local x = entity[i][2][2]
			local y = entity[i][3][2]
			term.setCursorPos(x - screen.x, y - screen.y)
			term.write(entity[i][4][2])
		end
	end
	for i,v in ipairs(entity) do
		if entity[i][5][2] == true and entity[i][7][2] == true then
			local x = entity[i][2][2]
			local y = entity[i][3][2]
			term.setCursorPos(x, y)
			term.write(entity[i][4][2])
		end
	end
end

function exec.defupdate() -- Default Update, can be overridden for custom draw handling
	term.clear()
	exec.draw()
end

function exec.start() -- Starts the current execution
	exec.active = true
	os.startTimer(1/30)
	while exec.active do
		local t,k = os.pullEvent()
		if t == 'timer' then
			if exec.beginstep ~= nil then exec.beginstep() end
			if exec.step ~= nil then exec.step() end
			if exec.endstep ~= nil then exec.endstep() end
			if exec.update ~= nil then exec.update()
			else exec.defupdate() end
			os.startTimer(1/30)
		elseif t == 'key' then
			if k == 14 then
				exec.quit()
			else
				if exec.key ~= nil then exec.key(k) end
			end
		end
	end
end