Stairs + Lights

-- Straight Staircase Miner — Simpler Turtle Program

-- === CONFIG ===
local TORCH_INTERVAL = 10
local TORCH_SLOT = 16
local FUEL_BUFFER = 100

-- === STATE ===
local stepCount = 0
local dir = 1 -- 1 = East
local x, y, z = 0, 0, 0
local startX, startY, startZ, startDir = 0, 0, 0, dir

-- === HELPERS ===
local function update(dx, dy, dz) x, y, z = x + dx, y + dy, z + dz end

local function tryForward()
  while not turtle.forward() do
    turtle.dig()
    sleep(0.2)
  end
  if dir == 0 then update(0, 0, -1)
  elseif dir == 1 then update(1, 0, 0)
  elseif dir == 2 then update(0, 0, 1)
  elseif dir == 3 then update(-1, 0, 0) end
end

local function tryDown()
  while not turtle.down() do
    turtle.digDown()
    sleep(0.2)
  end
  update(0, -1, 0)
end

local function tryUp()
  while not turtle.up() do
    turtle.digUp()
    sleep(0.2)
  end
  update(0, 1, 0)
end

local function face(d)
  while dir ~= d do turtle.turnRight(); dir = (dir + 1) % 4 end
end

local function goTo(tx, ty, tz)
  while y > ty do tryUp() end
  while y < ty do tryDown() end
  if x < tx then face(1) while x < tx do tryForward() end end
  if x > tx then face(3) while x > tx do tryForward() end end
  if z < tz then face(2) while z < tz do tryForward() end end
  if z > tz then face(0) while z > tz do tryForward() end end
end

local function returnToOrigin()
  goTo(startX, startY, startZ)
  face(startDir)
end

-- === INVENTORY ===
local function isFull()
  for i = 1, 15 do
    if turtle.getItemCount(i) == 0 then return false end
  end
  return true
end

local function unloadInventory()
  print("📦 Inventory full. Returning to unload...")
  local ox, oy, oz, od = x, y, z, dir
  returnToOrigin()
  face((startDir + 2) % 4)
  for i = 1, 15 do turtle.select(i); turtle.drop() end
  face(startDir)
  goTo(ox, oy, oz); face(od)
end

-- === FUEL ===
local function refuelIfNeeded()
  if turtle.getFuelLevel() == "unlimited" or turtle.getFuelLevel() > FUEL_BUFFER then return end
  print("🔋 Fuel low. Returning to refuel...")
  local ox, oy, oz, od = x, y, z, dir
  returnToOrigin()
  face((startDir - 1) % 4)
  for i = 1, 16 do
    turtle.select(i)
    if turtle.suck() and turtle.refuel() then break end
  end
  face(startDir)
  goTo(ox, oy, oz); face(od)
end

-- === TORCH ===
local function placeTorch()
  if stepCount % TORCH_INTERVAL == 0 then
    turtle.select(TORCH_SLOT)
    turtle.placeUp()
    print("🕯️ Placed torch.")
  end
end

-- === BEDROCK ===
local function isBedrockBelow()
  local ok, data = turtle.inspectDown()
  return ok and data.name == "minecraft:bedrock"
end

-- === MAIN ===
print("Enter depth to dig (or 'bedrock'):")
local input = read()
input = input:lower()
local toBedrock = (input == "bedrock")
local targetY = tonumber(input)
if not toBedrock and (not targetY or targetY <= 0) then print("❌ Invalid input.") return end

startX, startY, startZ, startDir = x, y, z, dir

print("⛏️ Starting straight staircase...")
while true do
  if toBedrock and isBedrockBelow() then print("🪨 Bedrock reached."); break end
  if not toBedrock and y >= targetY then print("📉 Reached target depth."); break end

  turtle.dig()
  tryForward()
  turtle.digDown()
  tryDown()

  stepCount = stepCount + 1
  placeTorch()
  if isFull() then unloadInventory() end
  refuelIfNeeded()
end

returnToOrigin()
print("✅ Staircase complete. Turtle returned to start.")