--Monitors energy levels on the left side.
--Outputs generator control signal on the back.
--Sends tank procentage with command "tankUpdate".

local r = component.proxy(component.list("redstone")());
local m = component.proxy(component.list("modem")());
local t = component.proxy(component.list("tank_controller")());

local port = 8000;
local address = "lol";

function sleep(time)
  local t = computer.uptime();
  while(computer.uptime() - t <= time) do
    computer.pushSignal("wait");
    computer.pullSignal();
  end
end

function beep()
  computer.beep();
end

function errorBeep()
  computer.beep(1000, 0.2);
  sleep(0.2);
  computer.beep(1000, 0.8);
end

function init()
  if(m) then
    if(r) then
      local portOpen = false;
      if(m.isOpen(port)) then
        portOpen = true;
      else
        portOpen = m.open(port);
      end

      if(portOpen) then
        beep();
        return true;
      end
    end
  end

  errorBeep();
  return false;
end

function getTankInfo()
  local cap = 0;
  local amount = 0;
  for i = 0, 5, 1 do
    local data = t.getFluidInTank(i);
    if(data ~= nil) then
      cap = tonumber(data[1]["capacity"]);
      amount = tonumber(data[1]["amount"]);
    end
  end

  local info = {};
  info["max"] = cap;
  info["amount"] = amount;

  return info;
end


--Main loop.
if(init()) then
  while(true) do
    sleep(10);

    --Check state of energy cell.
    if(r.getInput(5) < 15) then
      --Energy cell is not fully charged.
      r.setOutput(2, 15);
    else
      --Energy cell is fully charged.
      r.setOutput(2, 0);
    end

    --Check lava levels and send it to the mainframe.
    local info = getTankInfo();
    local procentage = math.floor((info["amount"] / info["max"]) * 100);

    m.send(address, port, "tankUpdate", procentage);
  end
end