local reactor = peripheral.wrap("back")
local monitor = peripheral.wrap("monitor_0")

if reactor == nil then
	error("No reactor found")
end
if monitor == nil then
	error("No monitor found")
end

local energyStored = 0
local energyProduced = 0
local energyCapacity = 0
local fillPercentage = 0
local controlRodLevel = 0

-- CONSTANTS
local BT_X = 2
local BT_Y = 2
local CR_X = 10
local CR_Y = 2
local WIN_HEIGHT = 25
local WIN_WIDTH = 5

-- Initialize Battery Window
local batteryWindowBG = window.create(monitor, BT_X, BT_Y, WIN_WIDTH, WIN_HEIGHT, true)
local batteryWindowFG = window.create(monitor, BT_X, BT_Y, WIN_WIDTH, WIN_HEIGHT/2, true)

batteryWindowBG.setBackgroundColor(colours.red)
batteryWindowBG.clear()
batteryWindowBG.redraw()

batteryWindowFG.setBackgroundColor(colours.green)
batteryWindowFG.clear()
batteryWindowFG.redraw()

-- Initialize Controll Rod Window
local cRodWindowBG = window.create(monitor, CR_X, CR_Y, WIN_WIDTH, WIN_HEIGHT, true)
local cRodWindowFG = window.create(monitor, CR_X, CR_Y, WIN_WIDTH, WIN_HEIGHT/2, true)

cRodWindowBG.setBackgroundColor(colours.grey)
cRodWindowBG.clear()
cRodWindowBG.redraw()

cRodWindowFG.setBackgroundColor(colours.yellow)
cRodWindowFG.clear()
cRodWindowFG.redraw()


local function round(num, numDecimalPlaces)
  local mult = 10^(numDecimalPlaces or 2)
  return math.floor(num * mult + 0.5) / mult
end

local function getAvgControlRodLevel()
	local levelTotal = 0
	for i=1, reactor.getNumberOfControlRods()-1 do
			levelTotal = levelTotal + reactor.getControlRodLevel(i)
	end
	local avglvl = levelTotal / reactor.getNumberOfControlRods()
	return avglvl
end

local function UpdateReactorStats()
	local stats = reactor.getEnergyStats()
	energyStored = stats["energyStored"]
	energyProduced = stats["energyProducedLastTick"]
	energyCapacity = stats["energyCapacity"]
	controlRodLevel = getAvgControlRodLevel()
	if energyStored == 0 then
		fillPercentage = 0
	else
		fillPercentage = energyStored / energyCapacity * 100
	end
end

local function ClearScreen()
	term.setBackgroundColor(colours.black)
	term.clear()
	term.setCursorPos(1,1)
end

local function ClearMonitor()
	monitor.setBackgroundColor(colours.black)
	monitor.clear()
	monitor.setCursorPos(1,1)
end

local function UpdateMonitorStats()
	batteryWindowFG.reposition(BT_X, BT_Y, WIN_WIDTH, fillPercentage/10)

	batteryWindowBG.redraw()
	batteryWindowFG.redraw()


	cRodWindowFG.reposition(CR_X, CR_Y, WIN_WIDTH, controlRodLevel/10)
	cRodWindowBG.redraw()
	cRodWindowFG.redraw()
end

ClearScreen()
ClearMonitor()
UpdateReactorStats()

while true do
	os.sleep(0.1)
	UpdateReactorStats()
	ClearScreen()
	ClearMonitor()
	UpdateMonitorStats()
end