mining

direction=1
floors=25
rows=25
blocks=25
x=0
y=0
z=0

function turnLeft()
  position(-1)
  turtle.turnLeft()
end

function turnRight()
  position(1)
  turtle.turnRight()
end

function dig()
  while turtle.detect() == true do
    turtle.attack()
    turtle.dig()
    os.sleep(0.5)
  end
end

function digUp()
  while turtle.detectUp() == true do
    turtle.digUp()
    os.sleep(0.5)
  end
end

function digDown()
  while turtle.detectDown() == true do
    turtle.digDown()
    os.sleep(0.5)
  end
end

function down(times)
  if times==nil then times=1 end
  for i=1,times do
    turtle.digDown()
    turtle.down()
    turtle.digDown()
    turtle.down()
    turtle.digDown()
    turtle.down()
    z=z-1
  end
end

function up(times)
  if times == nil then times=1 end
  for i=1,times do
    digUp()
    turtle.up()
    digUp()
    turtle.up()
    digUp()
    turtle.up()
    z=z+1
  end
end

function forward(times)
  if times == nil then times=1 end
  for i=1, times do
    dig()
    turtle.forward()
    if direction == 1 then x=x-1 elseif
      direction == 2 then y=y+1 elseif
      direction == 3 then x=x+1 elseif
      direction == 4 then y=y-1 end
  end
end

function position(x,h)
  if x<0 then
    if direction == 1 then
      direction = 4
    else
      direction = direction - 1
    end
  elseif x>0 then
    if direction == 4 then
      direction = 1
    else
      direction = direction + 1
    end
  end
end

function default_direction()
  while direction > 1 do
    turnLeft()
  end
end

function drop()
  for i=2,16 do
    turtle.select(i)
    turtle.drop()
  end
  turtle.select(1)
end

function spaceAviable()
  turtle.select(15)
  if turtle.getItemDetail() then
    return false
  else
    turtle.select(1)
    return true
  end
end

function checkChest()
  turtle.select(1)
  if turtle.compare() == false then
    dig()
    digUp()
    forward()
    digUp()
    turnLeft()
    turnLeft()
    forward()
    turnLeft()
    turnLeft()
    turtle.place()
  end
  turnLeft()
  forward()
  turnRight()
  if turtle.compare() == false then
    dig()
    digUp()
    forward()
    digUp()
    turnLeft()
    turnLeft()
    forward()
    turnLeft()
    turnLeft()
    turtle.place()
  end
  turnRight()
  forward()
  turnLeft()
end

function emptyTurtle(finish, start)
  if spaceAviable() and finish==nil then
    return false
  else
    local curx=x
    local cury=y
    local curz=z
    default_direction()
    if start == nil or start == false then
      if finish == true then
        up(-z)
      end
    end
    forward(x)
    turnLeft()
    forward(y)
    default_direction()
    checkChest()
    drop()
    if finish==nil or finish==false then
      turnRight()
      forward(cury)
      turnRight()
      forward(curx)
      turnLeft()
      down(-curz)
    end
    if start==true then
      turnRight()
      forward(cury)
      -- down(-curz)
    end
  end
end


turnRight()
forward(2)
for h=1, floors do
  for i=1, rows do
    for j=1, blocks do
      emptyTurtle()
      dig()
      digUp()
      digDown()
      forward()
      digUp()
      digDown()
    end
    turnLeft()
    turnLeft()
    for j=1, blocks do
      dig()
      forward()
    end
    if i~=rows then
      turnLeft()
      dig()
      forward()
      digUp()
      turnLeft()
    end
  end
  if h~=floors then
    emptyTurtle(true, true)
    down()
  end
end
emptyTurtle(true)
term.write(direction)
term.write(" ")
term.write('x: ')
term.write(x)
term.write(' y: ')
term.write(y)