Minecraft ComputerCraft Reactor Monitor

--Mekanism Fission Reactor Remote Status Monitor
--v0.91 by SemlerPDX Aug27 2021

--Reactor Control & Monitor Scripts
-- Control PC: https://pastebin.com/2VrXwGNH
--  and
-- Emergency Monitor PC:  https://pastebin.com/uxE2jE2B
--  and
-- Remote Status Monitor PC (this script): https://pastebin.com/59EWW86J
--
-- example image of setup:  https://imgur.com/a/nrKeBcH

--Peripheral Sides
monitorSide = "back"
modemSide = "left"

--id of rednet protocols
protocol = "PowerSys"
protocolCMD = "PowerCMD"

controlPC = 20 --id of reactor control PC
remotePC = 21 --id of (this) remote display status monitor PC
hazardPC = 22 --id of critical shutdown monitor PC

--Remote Command Keywords
msgOpenComms = "opencomms"
msgConfirmed = "copycopy"
commandON = "on"
commandOFF = "off"
remoteClear = "clear"
sysOnline = "Systems Online"
sysOffline = "Systems Offline"
--Remote Command Receive Timeout (in seconds)
timeout = 5

--Init
online = false
monitor = peripheral.wrap(monitorSide)
modem = peripheral.wrap(modemSide)
rednet.open(modemSide)

local function fSet()
  term.clear()
  monitor.clear()
  term.setCursorPos(1,1)
  monitor.setCursorPos(1,1)
  y = 1
end

local function fWrite(msg)
  y = y + 1
  term.write(msg)
  monitor.write(msg)
  term.setCursorPos(1,y)
  monitor.setCursorPos(1,y)
end

local function fToggleTxt(state)
  monitor.setCursorPos(1,5)
  monitor.write("                  ")
  monitor.setCursorPos(1,5)
  if state == commandON then
    monitor.write(" -Tap to Disable- ")
    online = true
  elseif state == commandOFF then
    monitor.write(" -Tap to Enable- ")
    online = false
  end
  monitor.setCursorPos(1,y)
end

--Rednet Recieve Requested Message
local function fRcv(msg)
  id,message = rednet.receive(protocolCMD,timeout)
  if message ~= nil then
    if msg == message then
      return true
    else
      return false
    end
  end
end

--Rednet Send with Receipt Confirmation
local function fSend(toID,msg,rcv,ccode)
  rednet.send(toID,msg,protocolCMD)
  if rcv then
    returnReceipt = fRcv(ccode)
    if returnReceipt then
      return true
    else
      return false
    end
  end
end

--Rednet Send Remote Toggle Command and Return Confirmation
local function fRemoteToggle(state)
  while true do
    commsOpen = fSend(controlPC,msgOpenComms,true,msgConfirmed)
    if commsOpen then
      commsOut = fSend(controlPC,state,true,msgConfirmed)
      return commsOut
    end
    sleep(1)
  end
end


--MAIN LOOP
while true do

  --Rednet Remote System Status Update
  local function fReactorStatus()
    while true do
      id,message = rednet.receive(protocol)
      if stateNew and stateChange then
        fToggleTxt(stateNew)
        stateChange = nil
      end
      if id == controlPC then
        if message == remoteClear then
          fSet()
        else
          if message == commandON then
            online = true
            fToggleTxt(commandON)
          elseif message == commandOFF then
            online = false
            fToggleTxt(commandOFF)
          else
            fWrite(message)
          end
        end
      end
    end
  end

  --Touchscreen Systems Online Toggle
  local function fTouch()
    while true do
      sleep(6)
      event,side,xPos,yPos = os.pullEvent("monitor_touch")
      if not online then
        stateNew = commandON
      elseif online then
        stateNew = commandOFF
      end
      stateChange = fRemoteToggle(stateNew)
    end
  end

  --Main Function should loop indefinitely
  monitorStatus = parallel.waitForAny(fReactorStatus,fTouch)

end