----
-- Parameters
----
stump_dist = 32
stump_lighting = 3
stump_current = 0
branch_dist = 32
branch_lighting = 7
branch_current = 0
return_dist = 0

function mine()
  while turtle.detect() do
    turtle.dig()
    sleep(0.5)
  end
end

function mine_up()
  while turtle.detectUp() do
    turtle.digUp()
    sleep(0.5)
  end
end

function check_fuel()
  term.clear()
  term.setCursorPos(1,1)
  if turtle.getFuelLevel() <= 0 then
    print("Looking for fuel...")
    for i = 1,16 do
      turtle.select(i)
      turtle.refuel()
      break
    end
  end
  if turtle.getFuelLevel() <= 0 then
    print("Could not fuel up...")
    sleep(30)
    check_fuel()
  end
end

function forward()
  check_fuel()
  if not turtle.forward() then
    for i = 1,16 do
      turtle.select(i)
      item = turtle.getItemDetail()
      if item ~= nil then
        if not string.find(item["name"], "torch") or not string.find(item["name"], "chest") then
          turtle.placeDown()
          break
        end
      end
      forward()
    end
  end
end

function backwards()
  check_fuel()
  turtle.back()
end

function torch()
  s = false
  i = 1
  for i = 1,16 do
    turtle.select(i)
    item = turtle.getItemDetail()
    if item ~= nil then
      if string.find(item["name"], "torch") then
        turtle.select(i)
        turtle.placeUp()
        s = true
        break
      end
    end
  end
  if not s then
    print("Could not place a torch...")
  end
end

function torch_stump()
  if stump_current % stump_lighting == 0 or stump_current == 0 then
    torch()
  end
end

function torch_branch()
  if branch_current % branch_lighting == 0 or branch_current == 0 then
    turtle.turnRight()
    torch()
    turtle.turnLeft()
  end
end

function check_inventory()
  for i = 1,16 do
    if turtle.getItemSpace(i) > 0 then
      return false
    end
  end
  return true
end

function storage_check()
  if not check_inventory() then
    return_dist = branch_current
    return_stump()
    forward()
    turtle.turnRight()
    mine()
    forward()
    turtle.digDown()
    for i = 1,16 do
      turtle.select(i)
      item = turtle.getItemDetail()
      if item ~= nil then
        if string.find(item["name"], "chest") then
          if turtle.getItemCount() > 1 then
            mine()
            forward()
            turtle.digDown()
            turtle.placeDown()
            backwards()
          end
          turtle.placeDown()
        end
      end
    end
    for i = 1,16 do
      turtle.select(i)
      item = turtle.getItemDetail()
      if item ~= nil then
        if not string.find(item["name"], "torch") or not string.find(item["name"], "chest") then
          turtle.dropDown()
        end
      end
    end
    backwards()
    turtle.turnRight()
    branch_current = return_dist - 1
    return_stump()
    turtle.turnRight()
    turtle.turnRight()
    branch_current = return_dist
  end
end  
    
function create_stump()
  mine()
  forward()
  mine_up()
  turtle.turnRight()
  mine()
  forward()
  mine_up()
  torch_stump()
  backwards()
  turtle.turnLeft()
  stump_current = stump_current + 1
end

function return_stump()
  while branch_current ~= 0 do
    backwards()
    branch_current = branch_current - 1
  end
end

function mine_branch()
  while branch_current ~= branch_dist do
    check_inventory()
    mine()
    forward()
    mine_up()
    torch_branch()
    branch_current = branch_current + 1
  end
  return_stump()
  turtle.turnRight()
  turtle.turnRight()
  forward()
  while branch_current ~= branch_dist do
    check_inventory()
    mine()
    forward()
    mine_up()
    torch_branch()
    branch_current = branch_current + 1
  end
  return_stump()
  backwards()
  turtle.turnLeft()
end

function initialize_branch()
  turtle.turnLeft()
  mine_branch()
end

stump_branching = 2
while stump_current ~= stump_dist do
  create_stump()
  if stump_branching == 3 then
    initialize_branch()
    stump_branching = 0
  end
  stump_branching = stump_branching + 1
end