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(5)
              robot.drop()
              robot.select(6)
              robot.drop()
              robot.select(7)
              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.swing()
              robot.select(2)
              robot.transferTo(14)
              os.sleep(20)
              robot.turnRight()
              os.sleep(60)
            end
          end


local function placeRails()
  local hasRails = inventory.getStackInInternalSlot(4)
              robot.select(4)
           if robot.count() <=2 then
              robot.select(8)
              robot.turnRight()
              robot.place()
              robot.select(2)
              robot.drop()
              robot.select(3)
              robot.drop()
              robot.select(5)
              robot.drop()
              robot.select(6)
              robot.drop()
              robot.select(7)
              robot.drop()
              robot.select(9)
              robot.drop()
              robot.select(10)
              robot.drop()
              robot.select(11)
              robot.drop()
    for slot = 1, inventory.getInventorySize(3) do
           if hasRails = inventory.getStackInSlot(slot) then
              repeat
              inventory.suckFromSlot(3, slot)
              until robot.count(4) >= 3
          return slot
              robot.swing()
              robot.select(2)
              robot.transferTo(8)
              robot.select(4)
              robot.turnLeft()
            end
          end
        end
              robot.turnAround()
              robot.place()
              robot.turnAround()
end




--[[local function checkTool()
        if not robot.durability(0.2) and robot.count(1) <= 0 then
              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)
           end
        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


          placeRails()

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

          repeat
          robot.detect()
          if state == "solid" then robot.swing()
          until state == "liquid" or "air" then robot.forward() -- moving forward
          end


          robot.turnLeft() -- face left

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


          repeat
          robot.detect()
          if state == "solid" then robot.swing()
          until state == "liquid" or "air" then robot.forward() -- moving forward under block 4
          end

          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

          repeat
          robot.detect()
          if state == "solid" then robot.swing()
          until state == "liquid" or "air" then robot.forward() -- moving forward under block 5
          end

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

          repeat
          robot.detect()
          if state == "solid" then robot.swing()
          until state == "liquid" or "air" then robot.forward() -- moving forward under block 6
          end

          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.swingUp()-- swing at block 6
        end
        --  checkTool()


        repeat
        robot.detectUp()
        if state == "solid" then robot.swing()
        until state == "liquid" or "air" then robot.up() -- moving up under block 9
        end

          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
          end

          repeat
          robot.detect()
          if state == "solid" then robot.swing()
          until state == "liquid" or "air" then robot.forward() -- moving forward under block 8
          end

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

          repeat
          robot.detect()
          if state == "solid" then robot.swing()
          until state == "liquid" or "air" then robot.forward() -- moving forward under block 7
          end

          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.swingUp() -- swing at block 7
          checkTool()
        end

          repeat
        robot.detectUp()
        if state == "solid" then robot.swing()
        until state == "liquid" or "air" then robot.up() -- moving up at block 7 position
        end

          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

          repeat
          robot.detect()
          if state == "solid" then robot.swing()
          until state == "liquid" or "air" then robot.forward() -- moving forward at block 8 position
          end

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

          robot.detect()
        if state == "solid" then robot.swing()
         end

          repeat
          robot.detect()
          if state == "solid" then robot.swing()
          until state == "liquid" or "air" then robot.forward() -- moving forward at block 9 position
          end

          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.turnAround()

          repeat
          robot.detect()
          if state == "solid" then robot.swing()
          until state == "liquid" or "air" then robot.forward() -- moving forward
          end

          robot.turnRight() -- face toward next layer

          repeat
          robot.detectDown()
          if state == "solid" then robot.swing()
          until state == "liquid" or "air" then robot.down()
          end

          repeat
          robot.detectDown()
          if state == "solid" then robot.swing()
          until state == "liquid" or "air" then robot.down()
          end


digHollow3x3()