local robot = require("robot")
local computer = require("computer")

local rEnergy = computer.maxEnergy() - computer.energy()
local passable, state = robot.detect()
local args = {...} -- ... gets the program's arguments somehow
local rowsToDig = args[1] -- getting the first argument in the argument table


local function digHollow3x3()

  while true do
      for i = 1, rowsToDig do
        if rEnergy < 200  then
            robot.select()
            robot.turnLeft()
            robot.place()
            robot.suck()
            os.sleep(20)
            robot.swing()
            robot.turnRight()
        end
          robot.detectDown()
        if state == "liquid" or "air" then robot.select() -- dev/ null
          robot.placeDown()
        end
          robot.select() -- rails
          robot.placeDown()
          robot.detect()
        if state == "solid" then robot.select() -- mining tool
          robot.swing() -- swing at block 2
        end
          robot.forward()
          robot.turnLeft() -- face left
          robot.detect() -- check for solid block
        if state == "solid" then robot.select()
          robot.swing() -- swing at block 1
        end
          robot.forward() -- under block 4
          robot.detectDown() -- detect under block 1
        if state == "liquid" or "air" then robot.select() -- dev/ null
          robot.placeDown()
        end
          robot.detect() -- detect left side of block 1
        if state == "liquid" or "air" then robot.select() -- dev/ null
          robot.place()
        end
          robot.turnAround() -- face right
          robot.forward() -- under block 5
          robot.detect()
        if state == "solid" then robot.select() -- mining tool
          robot.swing()-- swing at block 3
        end
          robot.forward() -- under block 6
          robot.detect() -- detect right side of block 3
        if state == "liquid" or "air" then robot.select() -- dev/ null
          robot.place()
        end
          robot.detectDown() -- detect under block block 3
        if state == "liquid" or "air" then robot.select() -- dev/ null
          robot.place()
        end
          robot.detectUp
        if state == "solid" then robot.select() -- mining tool
          robot.swing()-- swing at block 6
        end
          robot.up() -- under block 9
          robot.detect() -- detect block right of block 6
        if state == "liquid" or "air" then robot.select() -- dev/ null
          robot.place()
        end
          robot.turnAround() -- face left
          robot.detect()
        if state == "solid" then robot.select() -- mining tool
          robot.swing() -- swing at block 5
        end
          robot.forward() -- under block 8
          robot.detect()
        if state == "solid" then robot.select() -- mining tool
          robot.swing()          -- swing at block 4
        end
          robot.forward() -- under block 7
          robot.detect() -- detect block at right of block 4
        if state == "liquid" or "air" then robot.select() -- dev/ null
          robot.place()
        end
          robot.detectUp()
        if state == "solid" then robot.select() -- mining tool
          robot.swing() -- swing at block 7
        end
          robot.up() -- at block 7 position
          robot.detect() -- detect block on left side of block 7
        if state == "liquid" or "air" then robot.select() -- dev/ null
          robot.place()
        end
          robot.detectUp() -- detect block above block 7
        if state == "liquid" or "air" then robot.select() -- dev/null
          robot.placeUp()
        end
          robot.turnAround() -- face right
          robot.detect()
        if state == "solid" then robot.select() -- mining tool
          robot.swing() -- swing at block 8
        end
          robot.forward() -- at block 8 position
          robot.detectUp() -- detect block above block 8
        if state == "liquid" or "air" then robot.select()
          robot.placeUp()
        end
          robot.forward() -- at block 9 position
          robot.detectUp() -- detect block above block 9
        if state == "liquid" or "air" then robot.select()
          robot.placeUp()
        end
          robot.detect() -- detect block on the right of block 9
        if state == "liquid" or "air" then robot.select()
          robot.place()
        end
          robot.back()
          robot.turnLeft() -- face toward next layer
          robot.down(2)
        end
    end
end