lavarefuel

-- This program was written by Reizel.

local distanceX = 0
local distanceY = 0
local distanceZ = 0

local directionZ = "right"
local directionX = "front"
local finished = false

function refuel()
  while not turtle.detectDown() do
    turtle.placeDown()
    turtle.refuel()
    turtle.down()
    distanceY = distanceY + 1
  end
  for i = 1, distanceY, 1 do
    turtle.up()
  end
  distanceY = 0
end

function distanceCount()
  if (directionX == "front") then
    distanceX = distanceX + 1
  else
    distanceX = distanceX - 1
  end
end

function moveX()
  while not turtle.detect() do
    refuel()
    turtle.forward()
    distanceCount()
  end
  refuel()
  if (directionX == "front") then
    directionX = "back"
  else
    directionX = "front"
  end
end

function moveZ()
  local needToCheck = true
  local newDistance = 0
  turnTo()
  while turtle.detect() do
    turnTo()
    if turtle.detect() then
      finished = true
      return
    else
      turtle.forward()
      distanceCount()
    end
    turnTo("inverted")
    needToCheck = false
  end
  turtle.forward()
  if needToCheck then
    turnTo("inverted")
    while not turtle.detect() do
      turtle.forward()
      refuel()
      newDistance = newDistance + 1
    end
    turnTo()
    turnTo()
    for i = 1, newDistance, 1 do
      turtle.forward()
    end
  else
    turnTo()
  end
  distanceZ = distanceZ + 1
  if (directionZ == "right") then
    directionZ = "left"
  else
    directionZ = "right"
  end
end

function turnTo(type)
  if (type == nill) then
    if (directionZ == "right") then
      turtle.turnRight()
    else
      turtle.turnLeft()
    end
  elseif (type == "inverted") then
    if (directionZ == "right") then
      turtle.turnLeft()
    else
      turtle.turnRight()
    end
  end
end

-- --------------------------------- --
-- STARTING THE PROGRAM...           --
-- --------------------------------- --

term.clear()
term.setCursorPos(1,1)

if turtle.getFuelLevel() <= 5 then
  print("Not enought fuel, please place any kind of fuel on the first slot.")
  print()
  while turtle.getItemCount(1) == 0 do
    os.sleep(0.1)
  end
  turtle.refuel()
end

if turtle.getItemCount(1) == 0 then
  print("Please place a bucket on the first slot.")
  while turtle.getItemCount(1) == 0 do
    os.sleep(0.1)
  end
end

term.clear()
term.setCursorPos(1,1)

write("Starting Fuel Level: ")
print(turtle.getFuelLevel())

while turtle.detectDown() do
  turtle.forward()
  distanceX = distanceX + 1
end
turtle.placeDown()
turtle.refuel()
turtle.down()

while not finished do
  moveX()
  moveZ()
end

turtle.up()
turtle.turnRight()
turtle.turnRight()
for i = 1, distanceX, 1 do
  turtle.forward()
end
turnTo("inverted")
for i = 1, distanceZ, 1 do
  turtle.forward()
end
turnTo("inverted")

--//home
fw=5
up=5
while up > 0 do
  turtle.up()
  up=up -1
end

while fw > 0 do
turtle.forward()
fw=fw -1
end
--\\home

write("Ending Fuel Level: ")
print(turtle.getFuelLevel())