SLAVE_BETA

--[[
Changes:
Turtles no longer monitor how many rows they've gone forward (no more rowsProgressed file)
Master turtle simply waits for (numberNeighbours) unique turtles to send messages saying
they are ready and waiting. Slave turtles repeatedly send ready and waiting signals to prevent
the sync problems we were having before.
--]]

-- Open up modem to receive wireless broadcasts
rednet.open("right")

-- Wait until neighbouring turtles are ready
function waitForMaster()
  local event, param1, param2

  rednet.broadcast("I am ready and waiting master")
  os.startTimer(1)

  while true do
    event, param1, param2 = os.pullEvent()

    -- Resend ready message every second, in case master is not yet ready
    if event == "timer" then
      rednet.broadcast("I am ready and waiting master")
      os.startTimer(1)

    -- Wait for master turtle to give the OK to proceed before continuing digging
    elseif event == "rednet_message" then
      local message = param2
      if message == "You are authorised to proceed" then
        break
      end -- if message
    end -- if event
  end -- while
end -- function

bool=true

while bool==true do
  if rs.getInput("back", true) then
      print ("Waiting")
      sleep (1)
  else
    print ("Let's Roll!")
    bool=false
  end
end

X=3

print ("Startup Functions Activating")
print ("Going to lowest point")

turtle.select(4)
turtle.back()

while true do
  local mobsPresent = turtle.attackDown()
  local digSuccess = turtle.digDown()
  local movementSuccess = turtle.down()

  if not mobsPresent and not digSuccess and not movementSuccess then
    break
  end
end

for b = 1, X do
  turtle.digUp()
    while not turtle.up() do
      turtle.attackUp()
    end
  end

  print ("Calibrated level for a flat bedrock world.")
  print ("---------------------------")
  print ("Starting World Eating Scripts!")
  print ("---------------------------")

  turtle.dig()

  while not turtle.forward() do
    turtle.attack()
  end

  while true do

    for i = 1, 2 do

      for c = 1, X do
        turtle.dig()
        turtle.digDown()
        while not turtle.down() do
          turtle.attackDown()
        end
      end

      for d = 1, X do
        turtle.dig()
        turtle.digUp()
        while not turtle.up() do
          turtle.attackUp()
        end
      end

      for r = 1, 2 do
        turtle.dig()
        while not turtle.forward() do
          turtle.attack()
        end

      end

      Fuel = turtle.getFuelLevel()

      print ("Fuel level is: "..Fuel)

      if Fuel >= 8192 then

        print ("Fuel level is above minimum safe limit.")

      else

        print ("Fuel is below safe limit! Refueling!")

        turtle.select(3)
        turtle.place()
        turtle.suck()
        turtle.refuel()
        turtle.dig()

        turtle.select(4)

    end

    print ("Dropping off items")

    turtle.dig()
    turtle.attack()

    turtle.select(2)
    while not turtle.place() do
      turtle.select(4)
      turtle.attack()
      turtle.select(2)
    end

    for dropslot = 4, 16 do
      turtle.select(dropslot)
      turtle.drop()
    end

    waitForMaster()

    turtle.select(2)

    turtle.dig()

    turtle.select(4)

  end
end