startup

local x=0
local y=0
local z=0

local targx
local targy
local targz

--local sides = {"left","front","right","back"}

modem = peripheral.wrap("right")

modem.open(1)
modem.open(2)

if modem.isOpen(1) ~= true then
  print("Modem cannot open on channel 1")
  error()
end

if modem.isOpen(2) ~= true then
  print("Modem cannot open on channel 2")
  error()
end

modem.transmit(1,2,"Turtle's Modem is alive")

print("Insert how many blocks to dig in the X direction")
targx=tonumber(read())
print("Insert how many blocks to dig in the Y direction")
targy=tonumber(read())
print("Insert how many blocks to dig in the Z direction")
targz=tonumber(read())

print("The desired hole is " ..targx "x" ..targy "x" ..targz " in size")
print("Place the turtle on the BOTTOM RIGHT corner of the area you want to dig")
print("Then place a redstone torch behind the turtle. The turtle will face the correct direction automatically")

print("Press any key when torch is placed")
read()
while redstone.getInput("back")~=true do
  turtle.turnLeft()
end

if turtle.getFuelLevel()<64 then
  print("Place fuel on the first turtle slot")
  while turtle.refuel() == false do
    turtle.refuel()
    os.sleep(1)
  end
end

print("Press enter to start")
read()
print("Starting in 5 seconds")
modem.transmit(1,2,"Starting in 5 seconds")
os.sleep(5)
modem.transmit(1,2,"Starting")

for x=0,targx-1,1 do
  for y=0,targy-1,1 do
    for z=0,targz-1,1 do
      modem.transmit(1,2,z)
      turtle.dig()
      modem.transmit(1,2,"Dig")
      if z~= (targz-1) then
        turtle.forward()
      end
    end
    for z=targy-1,0,-1 do
      turtle.back()
      modem.transmit(1,2,z)
    end
    if y~=(targy-1) then
      turtle.turnLeft()
      turtle.forward()
      turtle.turnRight()
    end
  end
  turtle.turnLeft()
  for y=targy-1,0,-1 do
    turtle.back()
    modem.transmit(1,2,y)
  end
  turtle.turnRight()
  if x~=(targx-1) then
    turtle.up()
  end
end
for x=targx-1,0,-1 do
  turtle.down()
end
modem.transmit(1,2,"Done")