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

local c = component.crafting
local inventory = component.inventory_controller
local g = component.generator
local passable, state = robot.detect() -- return values for robot.detect()
local args = {...} -- ... gets the program's arguments somehow
local rowsToDig = args[1] -- getting the first argument in the argument table


local function checkEnergy()

        if     computer.energy() <= 200 then
              robot.select(15)
              g.insert()
              robot.select(2)
              robot.drop()
              robot.select(3)
              robot.drop()
              robot.select(4)
              robot.drop()
              robot.select(5)
              robot.drop()
              robot.select(6)
              robot.drop()
              robot.select(7)
              robot.drop()
              robot.select(8)
              robot.drop()
              robot.select(9)
              robot.drop()
              robot.select(10)
              robot.drop()
              robot.select(11)
              robot.drop()
              robot.select(14)
              robot.turnLeft()
              robot.place()
              robot.select(15)
              inventory.suckFromSlot(3, 1)
              g.insert()
              inventory.suckFromSlot(3, 1)
              robot.select(2)
              robot.transferTo(14)
              os.sleep(20)
              robot.swing()
              robot.turnRight()
              os.sleep(60)
        until computer.energy() >= 201
          else  computer.shutdown()
            end





local function checkTool()
        if not robot.durability() <= 0.2 and robot.count(1) <= 0 then
          repeat
              robot.select(2)
              robot.drop()
              robot.select(3)
              robot.drop()
              robot.select(4)
              robot.drop()
              robot.select(5)
              robot.drop()
              robot.select(6)
              robot.drop()
              robot.select(7)
              robot.drop()
              robot.select(8)
              robot.drop()
              robot.select(9)
              robot.drop()
              robot.select(10)
              robot.drop()
              robot.select(11)
              robot.drop()
              robot.select(17)
              robot.transferTo(2)
              c.craft(1)
              robot.select(2)
              robot.transferTo(17)
      until    robot.durability() == 1 or robot.count(1) <= 0 and robot.durability() >= 0.2
        else  computer.shutdown()
      end


local function digHollow3x3()

      for i = 1, rowsToDig do


          checkEnergy()
          checkTool()


          robot.detectDown()
        if state == "liquid" or "air" then robot.select(13) -- dev/ null
          robot.placeDown()
        end

          robot.select(4) -- rails
          robot.placeDown()

          robot.detect()
        if state == "solid" then robot.swing() -- swing at block 2
          checkTool()
        end

          robot.forward()
          robot.turnLeft() -- face left

          robot.detect() -- check for solid block
        if state == "solid" then robot.swing() -- swing at block 1
          checkTool()
        end

          robot.forward() -- under block 4

          robot.detectDown() -- detect under block 1
        if state == "liquid" or "air" then robot.select(13) -- dev/ null
          robot.placeDown()
        end

          robot.detect() -- detect left side of block 1
        if state == "liquid" or "air" then robot.select(13) -- dev/ null
          robot.place()
        end

          robot.turnAround() -- face right
          robot.forward() -- under block 5

          robot.detect()
        if state == "solid" then robot.swing()-- swing at block 3
          checkTool()
        end

          robot.forward() -- under block 6

          robot.detect() -- detect right side of block 3
        if state == "liquid" or "air" then robot.select(13) -- dev/ null
          robot.place()
        end

          robot.detectDown() -- detect under block block 3
        if state == "liquid" or "air" then robot.select(13) -- dev/ null
          robot.place()
        end

          robot.detectUp()
        if state == "solid" then robot.swing()-- swing at block 6
          checkTool()
        end

          robot.up() -- under block 9

          robot.detect() -- detect block right of block 6
        if state == "liquid" or "air" then robot.select(13) -- dev/ null
          robot.place()
        end

          robot.turnAround() -- face left

          robot.detect()
        if state == "solid" then robot.swing() -- swing at block 5
          checkTool()
        end

          robot.forward() -- under block 8

          robot.detect()
        if state == "solid" then robot.swing()          -- swing at block 4
          checkTool()
        end

          robot.forward() -- under block 7

          robot.detect() -- detect block at right of block 4
        if state == "liquid" or "air" then robot.select(13) -- dev/ null
          robot.place()
        end

          robot.detectUp()
        if state == "solid" then robot.swing() -- swing at block 7
          checkTool()
        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(13) -- dev/ null
          robot.place()
        end

          robot.detectUp() -- detect block above block 7
        if state == "liquid" or "air" then robot.select(13) -- dev/null
          robot.placeUp()
        end

          robot.turnAround() -- face right

          robot.detect()
        if state == "solid" then robot.swing() -- swing at block 8
          checkTool()
        end

          robot.forward() -- at block 8 position

          robot.detectUp() -- detect block above block 8
        if state == "liquid" or "air" then robot.select(13)
          robot.placeUp()
        end

          robot.forward() -- at block 9 position

          robot.detectUp() -- detect block above block 9
        if state == "liquid" or "air" then robot.select(13)
          robot.placeUp()
        end

          robot.detect() -- detect block on the right of block 9
        if state == "liquid" or "air" then robot.select(13)
          robot.place()
        end

          robot.back()
          robot.turnLeft() -- face toward next layer
          robot.down(2)
  end

digHollow3x3()