local version = 1.0

write("Welcome to miner v"..version.."\n")

write("Enter how wide the mine should be: ")
local width = tonumber(io.read())

write("Enter how deep the mine should be: ")
local depth = tonumber(io.read())

write("Enter 1 to go left or 0 to go right: ")
local direction = tonumber(io.read())

if direction ~= 0 and direction ~= 1 then
  error("Invalid direction: "..direction)
end

write("Beginning miner!\n")

function forward()
  while not turtle.forward() do
    turtle.dig()
    sleep(0.5)
  end
end

function up()
  while not turtle.up() do
    turtle.digUp()
    sleep(0.5)
  end
end

function turn(dir)
  if dir == 0 then
    turtle.turnRight()
  else
    turtle.turnLeft()
  end
end

function mineLayer(dir)
  forward()
  up()
  turtle.digUp()
  turn(dir)

  for i=2,width do
    forward()
    turtle.digDown()
    turtle.digUp()
  end

  turtle.down()
  if dir == 0 then
    turn(1)
  else
    turn(0)
  end
end

for i=1,depth do
  checkFuel()
  if i % 2 == 1 then
    mineLayer(direction)
  else
    if direction == 1 then
      mineLayer(0)
    else
      mineLayer(1)
    end
  end
end

turtle.turnRight()
turtle.turnRight()
for i=1,depth do
  forward()
end

write("Finished mining\n")