print("Enter desired length of tunnels")

local branchLength = read()

print("Is this turtle on the right:r or left:l")

local turtleSide = read()

print("How many branches?")

local branches = read()

local shaftLength = 1

local totalLength = shaftLength * 2 + branchLength * 2

local fuelStuff = 0
 
function diggyDiggy()
  turtle.forward()
  turtle.digUp()
  turtle.digDown()
  turtle.dig()
end

function gravel()
  turtle.detect()
  if turtle.detect() == true then
    diggyDiggy()
    gravelception()
  end
end

function gravelception()
  turtle.detect()
  if turtle.detect() == true then
    diggyDiggy()
    gravel()
  end
end

function awYiss()
  totalLength = branchLength * 2 + shaftLength * 2
  turtle.getFuelLevel() 
  fuelStuff = (totalLength - turtle.getFuelLevel()) / 96
  if fuelStuff < turtle.getItemCount(1) then
    if fuelStuff < 5 then
      if fuelStuff < 4 then
        if fuelStuff < 3 then
          if fuelStuff < 2 then
            if fuelStuff < 1 then
              if fuelStuff < 0 then
              print ("requires no fuel")
              else   
              turtle.refuel(1)
              end
            else
            turtle.refuel(2)
            end
          else
          turtle.refuel(3)
          end
        else
        turtle.refuel(4)
        end
      else
      turtle.refuel(5)
      end
      turtle.dig()
      for i = 1,shaftLength do
        diggyDiggy()
        turtle.detect()
        if turtle.detect() == true then
          gravelception()
        end
      end
      if turtleSide == "r" then
        turtle.turnRight()
      end
      if turtleSide == "l" then
        turtle.turnLeft()
      end
      turtle.dig()
      for i = 1,branchLength do
        diggyDiggy()
        turtle.detect()
        if turtle.detect() == true then
          gravelception()
        end
      end
      turtle.turnRight()
      turtle.turnRight()
      for i = 1,branchLength do
        turtle.forward()
      end 
      if turtleSide == "r" then
        turtle.turnLeft()
      end
      if turtleSide == "l" then
        turtle.turnRight()
      end
      for i = 1,shaftLength do
        turtle.forward()
      end
      shaftLength = shaftLength + 3
    else
    print("I declare the distance I must travel to be far too long!")
    end
  else
  print("not enough fuel to continue")
  end
end

for i = 1,branches do
  awYiss()
  if turtleSide == "r" then
    turtle.turnLeft()
  end
  if turtleSide == "l" then
    turtle.turnRight()
  end
  turtle.select(2)
  turtle.drop()
  turtle.select(3)
  turtle.drop()
  turtle.select(4)
  turtle.drop()
  turtle.select(5)
  turtle.drop()
  turtle.select(6)
  turtle.drop()
  turtle.select(7)
  turtle.drop()
  turtle.select(8)
  turtle.drop()
  turtle.select(9)
  turtle.drop()
  turtle.select(10)
  turtle.drop()
  turtle.select(11)
  turtle.drop()
  turtle.select(12)
  turtle.drop()
  turtle.select(13)
  turtle.drop()
  turtle.select(14)
  turtle.drop()
  turtle.select(15)
  turtle.drop()
  turtle.select(16)
  turtle.drop()
  turtle.select(1)
  if turtleSide == "r" then
    turtle.turnLeft()
  end
  if turtleSide == "l" then
    turtle.turnRight()
  end
end