Robot TreeFarm + Charcoal

-- Request for Project: Always revert back to previous selected slot after changing it
robot = require("robot")
local component = require("component")
local g = component.generator
x=14
z=16
CounterTrees = 0

function hugoCutTree()
  CounterTrees = CounterTrees + 1
  robot.swing()
  while not robot.forward() do robot.swing() end
  robot.swingDown()
  PlaceDownSafe(1)
  local counter = 0
  while robot.detectUp() do
    robot.swingUp()
    if robot.up() then counter = counter + 1 end
  end
  while counter > 0 do
    robot.swingDown()
    if robot.down() then counter = counter - 1 end
  end
  PlaceDownSafe(1)
end

function PlaceDownSafe( Min )
  if robot.count( 16 ) > Min then
    robot.placeDown()
    return true
  else
    return false
  end
end

function TreeTile()
        while robot.detect() == true do robot.swing() end
        robot.swing()
    robot.forward()
    robot.suckDown()
end
function CobbleTile()
  if robot.detect() then hugoCutTree() else robot.forward(); PlaceDownSafe(1) end
  robot.suckDown()
end

function Tile()
  if TileSwitch == true then
    TreeTile()
    TileSwitch = false
  else
    CobbleTile()
    TileSwitch = true
  end
end

while true do
  --print("Let me chop chop trees!")
  --os.pullEvent("char")
  --print("CHOP CHOP nom nom nom....")
  TileSwitch = false
  statsCountTrees = {}
  robot.turnLeft()
  robot.turnLeft()
  robot.select(1)
  robot.suck(64)
  g.insert(64)
  robot.turnLeft()
  robot.turnLeft()
  robot.up()
  robot.turnLeft()
  robot.select(16) -- Careful!
  Tile()
  --TODO: Reful me, feed me, master! (CHECK)

  for i=1,z do
    for j=1,x do Tile() end

    if i < z then
      if i%2 == 0 then robot.turnLeft() else robot.turnRight() end
      Tile()
      if i%2 == 0 then robot.turnLeft() else robot.turnRight() end
    else
      Tile()
      if i%2 == 1 then robot.turnLeft() else robot.turnRight() end
      for j=1,z-1 do Tile() end
    end
  end

  robot.down()
  robot.turnLeft()
  robot.turnLeft()
  for i=1,15 do
    robot.select(i)
    robot.dropDown()
  end
  robot.select(16)
  term.clear()
  print("Finished, Master, chopped ", CounterTrees, " trees :)")
  statsCountTrees[table.maxn(statsCountTrees)+1] = CounterTrees
  CounterTrees = 0
  do
    local sum = 0
    local avg = 0
    for i,v in ipairs(statsCountTrees) do sum = sum + v end
    avg = sum / table.maxn(statsCountTrees)
    print("Statistics for you:")
    print("Total: ",sum)
    print("Average: ",avg)
    print("Fuel: ",robot.getFuelLevel())
  end
  --print("")

  --print("Press anything to pause me in next 10sec...")
  --os.timer(10)
  --local event, param = os.pullEvent()
  --if param < "timer" then
    --print("Paused!!! Press anything to continue...")
    --os.pullEvent()
  --end
end