layer_maker

turtle_location = vector.new(0, 0, 0)
area_size = vector.new(0, 0, 0)
turtle_slot = 1

-- Gets user input
function get_size()
 -- Local variables
 local invCount = 0 -- Count of bricks in the turtle's inventory.
 local totalArea = 0 -- Total area to be filled in terms of minecraft bricks.
 print("How long?")
 area_size.x = tonumber(read())
 print("How wide?")
 area_size.y = tonumber(read())

 -- Calculates if there are enough bricks in the inventory to fill the selected area.
 print("Calculating area fill size vs. bricks in inventory...")
 totalArea = area_size.x * area_size.y
 for i=1, 16 do
  invCount = invCount + turtle.getItemCount(i)
 end
 if invCount < totalArea then
  return false
 else
  return true
 end
end

-- Move right.
function move_right()
        turtle.turnRight()
        if turtle.detect() then
                turtle.dig()
        end
        while not turtle.forward() do
          os.sleep(5)
        end
        turtle.turnLeft()
        turtle_location.y = turtle_location.y + 1
end

-- Block placement subroutine
function place_block()
  if not turtle.detectDown() then
    while not turtle.placeDown() do
      turtle_slot = turtle_slot + 1
      turtle.select(turtle_slot)
    end
  end
end
-- X Fill
function x_fill()
  repeat
    -- If it does not detect a block under the turtle, it tries to place a block below.
    place_block()

    while turtle_location.x < area_size.x and not turtle.forward() do
      if turtle.detect() then turtle.dig() end
      os.sleep(5)
    end
    turtle_location.x = turtle_location.x + 1
  until turtle_location.x >= area_size.x-1

  -- Refine logic later; for now this will place the blocks.
  -- Need to alter loop so that the turtle places a block every time it moves forward.
  place_block()

  while turtle_location.x > 0 do
    while not turtle.back() do
      os.sleep(5)
    end
    turtle_location.x = turtle_location.x - 1
  end
end

-- Fills an area
function area_fill()
  if not get_size() then
    print("Insufficient blocks in inventory.")
    return
  end

  x_fill()
  while turtle_location.y < area_size.y-1 and area_size.y ~= 1 do
    move_right()
    x_fill()
  end

  turtle.turnLeft()

  repeat
    while not turtle.forward() do
      os.sleep(5)
    end
    turtle_location.y = turtle_location.y - 1
  until turtle_location.y == 0

  turtle.turnRight()
end

-- Execute the program
area_fill()