reactor_display

ReactorScreen = {}
ReactorScreen.__index = ReactorScreen

function ReactorScreen:new(periph_name, reactor)
  local self = setmetatable({}, ReactorScreen)
  
  self.periph_name = periph_name
  self.periph = peripheral.wrap(self.periph_name)
  self.reactor = reactor
  
  return self
end

function ReactorScreen:get_x_centre()
  local w, h = self.periph.getSize()
  
  return w / 2
end

function ReactorScreen:get_y_centre()
  local w, h = self.periph.getSize()
  
  return h / 2
end

function ReactorScreen:clear()
  self.periph.clear()
end

function ReactorScreen:print_centred(text, y)
  local length = string.len(text)
  local start = self:get_x_centre() - (length / 2)
  
  local orig_x, orig_y = self.periph.getCursorPos()
  self.periph.setCursorPos(start, y)
  self.periph.write(text)
  self.periph.setCursorPos(orig_x, orig_y)
end

function ReactorScreen:set_print_colour(c)
  self.periph.setTextColour(c)
end

function ReactorScreen:reset_colour()
  self.periph.setTextColour(colours.white)
end

function ReactorScreen:update()
  -- do stuff with self.reactor to pretty-print status
  local y_centre = self:get_y_centre()
  
  self:clear()
  
  if self.reactor:is_active() then
    self:set_print_colour(colours.green)
    self:print_centred("Reactor active", y_centre - 3)
    self:print_centred("[ STOP ]", y_centre + 3)
    self:reset_colour()
  else
    self:set_print_colour(colours.red)
    self:print_centred("Reactor inactive", y_centre - 3)
    self:print_centred("[ START ]", y_centre + 3)
    self:reset_colour()
  end
  
  self:print_centred("Storage: " .. tostring(self.reactor:get_stored_amount()) .. " RF (" .. tostring(self.reactor:get_stored_percentage()) .. "%)", y_centre - 2)
  self:print_centred("Efficiency: " .. tostring(self.reactor:get_efficiency()) .. " RF/mB", y_centre - 1)
  self:print_centred("Fuel: " .. tostring(self.reactor:get_fuel_level()) .. " mB (" .. tostring(self.reactor:get_fuel_percentage()) .. "%)", y_centre)
  self:print_centred("Control: " .. tostring(self.reactor:get_control_level()) .. "%", y_centre + 1)
  
end

-- callback is a function that accepts a ReactorScreen and a string explaining
-- the reason for the callback triggering.
function ReactorScreen:start_event_loop(callback)
  local refresh_rate = 3

  while true do
    local timer_id = os.startTimer(refresh_rate)
    local event, button, x, y
    
    repeat
      event, button, x, y = os.pullEvent()
    until event == "monitor_touch" or (event == "timer" and button == timer_id)
        
    if event == "timer" then
        self:update()
        callback(self, "timer")
    elseif event == "monitor_touch" then
      self.reactor:toggle_active_state()
      self:update()
    
      -- then must handle click event
      callback(self, "monitor_touch")
    end
  end
end