MazeBuilder

args = {...}

local function Define()
  maze = {1,2,3,4,5,6,7,8,9,10,11,12,13,14}
  maze[1] = {0,0,0,0,0,1,0,0,0,0,0,0,0,0}
  maze[2] = {0,1,1,1,0,1,1,1,0,1,1,1,1,0}
  maze[3] = {0,1,0,0,0,0,0,0,0,1,0,0,0,0}
  maze[4] = {0,1,1,1,1,1,1,0,1,1,0,1,1,0}
  maze[5] = {0,0,0,0,0,0,1,0,0,0,0,0,1,0}
  maze[6] = {1,1,0,1,1,0,1,1,1,1,1,0,1,1}
  maze[7] = {0,1,0,1,0,0,1,0,0,0,0,0,0,0}
  maze[8] = {0,1,0,1,1,1,1,0,1,1,1,1,1,0}
  maze[9] = {0,0,0,0,0,0,1,0,1,0,0,0,0,0}
  maze[10] = {1,1,1,0,1,0,1,0,1,0,1,0,1,0}
  maze[11] = {0,1,0,0,1,0,1,0,0,0,0,0,1,0}
  maze[12] = {0,0,0,1,1,0,1,0,1,1,1,1,1,0}
  maze[13] = {0,1,1,1,1,0,1,0,1,0,0,0,1,0}
  maze[14] = {0,0,0,0,0,0,0,0,0,0,1,0,0,0}
end

local function select(item)
  if item == 1 then
    for i = 1, 4 do
      if turtle.getItemCount(i) > 0 then
        turtle.select(i)
        return
      end
    end
  else
    for i = 1, 4 do
      i = i + 4
      if turtle.getItemCount(i) > 0 then
        turtle.select(i)
        return
      end
    end
  end
end

local function Maze(build)
  turn = 1
  turtle.select(16)
  turtle.digUp()
  turtle.up()
  turtle.digUp()
  turtle.up()
  turtle.placeDown()
  if build then
    turtle.turnRight()
    turtle.turnRight()
    turtle.back()
    turtle.place()
  else
    turtle.select(5)
    turtle.dig()
    turtle.forward()
    turtle.turnLeft()
    turtle.turnLeft()
    turtle.select(16)
    turtle.place()
    turtle.turnLeft()
    turtle.turnLeft()
    turtle.select(5)
  end
  for y = 1, 14 do
    for x = 2, 14 do
      if build then
        turtle.back()
        select(2)
        turtle.place()
        if turn == 2 then x = 15 - x end
        if maze[y][x] == 1 then
          select(1)
          turtle.placeDown()
        end
      else
        turtle.select(5)
        turtle.dig()
        turtle.forward()
        turtle.select(1)
        turtle.digDown()
      end
    end
    if turn == 1 then
      turtle.turnRight()
    else
      turtle.turnLeft()
    end
    if y ~= 14 then
      if build then
        turtle.back()
        select(2)
        turtle.place()
        if y ~= 14 then
          if maze[(y+1)][14] == 1 then
            select(1)
            turtle.placeDown()
          end
        end
      else
        turtle.select(5)
        turtle.dig()
        turtle.forward()
        turtle.select(1)
        if y ~= 14 then
          turtle.digDown()
        end
      end
      if turn == 1 then
        turtle.turnRight()
        turn = 2
      else
        turtle.turnLeft()
        turn = 1
      end
    end
  end
  if build then
    turtle.turnRight()
    turtle.turnRight()
  end
  turtle.select(16)
  turtle.dig()
  turtle.forward()
  turtle.turnRight()
  if build then
    turtle.turnRight()
    select(2)
    turtle.place()
    turtle.turnLeft()
  end
  turtle.select(16)
  turtle.digDown()
  turtle.down()
  turtle.placeUp()
  turtle.down()
  turtle.placeUp()
  turtle.forward()
  turtle.turnRight()
  for i = 1, 15 do
    turtle.forward()
  end
  turtle.turnRight()
end

Define()
if (args[1] == "build") and (turtle.getItemCount(5) > 0) then
  Maze(true)
elseif (args[1] == "destroy") and (turtle.getItemCount(5) == 0) then
  Maze(false)
end