Master Elven

--[[
Changes:
Turtles no longer monitor how many rows they've gone forward (no more rowsProgressed file)
Master turtle simply waits for (numberSlaves) 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.
--]]

-- Number of neighbouring turtles
numberSlaves = 15

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

-- Wait until neighbouring turtles are ready
function waitForSlaves()
  local IDsOfWaitingTurtles = {}
  local remoteTurtleID, rednetMessage
  local newTurtleIsReportingReady

  -- Wait for (numberNeighbours) unique turtles to send ready messages
  repeat
    remoteTurtleID, rednetMessage, _ = rednet.receive()

    if rednetMessage == "I am ready and waiting master" then
      -- Check if turtle has replied already
      newTurtleIsReportingReady = true

      for i=1, table.getn(IDsOfWaitingTurtles) do
        if remoteTurtleID == IDsOfWaitingTurtles[i] then
          newTurtleIsReportingReady = false
          break
        end
      end

      if newTurtleIsReportingReady then
        table.insert(IDsOfWaitingTurtles, remoteTurtleID)
      end
    end
  until table.getn(IDsOfWaitingTurtles) >= numberSlaves

  rednet.broadcast("You are authorised to proceed")
end

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=66

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

turtle.select(1)
turtle.dig()
turtle.select(3)
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(2)
        turtle.place()
        turtle.suck()
        turtle.refuel()
        turtle.dig()

        turtle.select(3)

    end

    print ("Dropping off items")

        turtle.dig()
        turtle.attack()


    turtle.select(1)
    while not turtle.place() do
      turtle.select(3)
      turtle.attack()
      turtle.select(1)
    end

    for dropslot = 3, 16 do
      turtle.select(dropslot)
      turtle.drop()
    end

    waitForSlaves()

    turtle.select(1)

    turtle.dig()

    turtle.select(3)

  end
end