Energy status display / Engine control

--[[
	Simple Energy storage display for redstone energy cells
	and on-demand engine control
	The engine control part is optional, don't connect a rednet
	cable if you only want to display energy storage.

	by got_m1lk
--]]

--Specify side of wired modem
-- Valid: "left", "right", "front", "back", "top", "bottom"
local modemside = "left"

--Specify side of rednet cable
local rednetside = "bottom"

--Specify side of monitor
--If the monitor is attached to the modem specify peripheral-ID instead.
local monitorside = "top"

--Adjust the textscale if you have a bigger/smaller monitor
--Increments of 0.5
local textsize = 1

--Specify at what percentage the engines turn on
local min = 25

--Specify at what percentage the engines turn off
local max = 95

--Specify the peripheral-IDs of you redstone cells
--Remove/add units from the table to fit it to the amount
-- of cells you are using
local storageUnits = {
	{
		 ["id"] = "redstone_energy_cell_0",
		 ["name"] = "Cell1"
	},
	  {
		 ["id"] = "redstone_energy_cell_1",
		 ["name"] = "Cell2"
	},
	  {
		 ["id"] = "redstone_energy_cell_2",
		 ["name"] = "Cell3"
	},
	  {
		 ["id"] = "redstone_energy_cell_3",
		 ["name"] = "Cell4"
	}

}

local mon = peripheral.wrap(monitorside)
local net = peripheral.wrap(modemside)


mon.clear()
mon.setTextScale(textsize)
mon.setTextColor(512)
mon.setCursorPos(1,2)
mon.write(" Energy Remaining:")
mon.setCursorPos(1,10)
mon.write("  Engine Status:")
mon.setTextColor(2)
rs.setBundledOutput(rednetside,colors.black)

while true do

	capacity = 0
	amount = 0

	for i=#storageUnits,1,-1 do
		  storageUnit = storageUnits[i]
		  capacity = capacity + net.callRemote(storageUnit["id"], "getMaxEnergyStored")
		  amount = amount + net.callRemote(storageUnit["id"], "getEnergyStored")
	end


	percentage = tonumber((amount / capacity) *100)
	percentage = math.floor(percentage)


	if percentage <= min then
	  rs.setBundledOutput(rednetside,colors.white)
	end

	if percentage >= max then
	 rs.setBundledOutput(rednetside,colors.black)
	end


	percentage = string.match(tostring(percentage),'[^%.]+')
	mon.setCursorPos(8,4)
	mon.clearLine()
	mon.setTextColor(2)
	mon.write(percentage .. "%")
	mon.setCursorPos(1,6)
	mon.clearLine()
	mon.setTextColor(512)
	mon.write("Energy: ")
	mon.setTextColor(2)
	mon.write(string.match(tostring(amount),'[^%.]+') .. " MJ")
	mon.setCursorPos(1,7)
	mon.clearLine()
	mon.setTextColor(512)
	mon.write("  Size: ")
	mon.setTextColor(2)
	mon.write(string.match(tostring(capacity),'[^%.]+') .." MJ")

	if rs.getBundledInput(rednetside) == colors.black then
	     mon.setTextColor(colors.red)
		 mon.setCursorPos(8,11)
		 mon.write("OFF")
	elseif rs.getBundledInput(rednetside) == colors.white then
		 mon.setTextColor(colors.lime)
		 mon.setCursorPos(8,11)
		 mon.write(" ON")
	end


	sleep(1)
end