os.loadAPI("modules.lua")

function mine_line(length, height)
  local front = true
  -- Check if the user enters only 1 length or height.
  -- This is too short
  if length == 1 or height == 1 then
    print('Please choose a number higher than 1 for length and height.')
    return false
  end

  for i = 1, height do
    for j = 1, length do
      modules.check_fuel()
      turtle.dig()
      turtle.forward()
    end

    -- Check if this is the last round to prevent digging up
    if i ~= height then
      modules.check_fuel()
      turtle.digUp()
      turtle.up()
    end

    turtle.turnLeft()
    turtle.turnLeft()
    front = not front
  end

  -- Everything finisehd, go back to start
  if not front then
    for i = 1, length do
      turtle.forward()
    end
  end
  for i = 1, height - 1 do
    turtle.down()
  end
end

print("How long should I dig?")
local length = read()
print("How wide should I dig?")
local width = read()
print("How high should I dig?")
local height = read()

mine_line(length, height)