Chunk Eater

-- ✅ FINAL CHUNK EATER: Mines 16x16, returns to start to unload/refuel

-- === CONFIG ===
local CHUNK_SIZE = 16
local LAYER_HEIGHT = 3
local FUEL_BUFFER = 100

-- === POSITION TRACKING ===
local x, y, z = 0, 0, 0
local dir = 1 -- 0=north, 1=east, 2=south, 3=west
local startX, startY, startZ, startDir = x, y, z, dir

-- === DIRECTION HELPERS ===
local function turnRight() turtle.turnRight(); dir = (dir + 1) % 4 end
local function turnLeft() turtle.turnLeft(); dir = (dir - 1) % 4 end
local function face(target) while dir ~= target do turnRight() end end
local function faceExact(targetDir) while dir ~= targetDir do turnRight() end end
local function updatePosition(dx, dy, dz) x, y, z = x + dx, y + dy, z + dz end

-- === INVENTORY CHECK ===
local function isFull()
  for i = 1, 16 do
    if turtle.getItemCount(i) == 0 then return false end
  end
  return true
end

-- === GO TO COORDINATES ===
local function goTo(xT, yT, zT)
  while y < yT do turtle.down(); updatePosition(0, 1, 0) end
  while y > yT do turtle.up(); updatePosition(0, -1, 0) end

  face(1) while x < xT do turtle.forward(); updatePosition(1, 0, 0) end
  face(3) while x > xT do turtle.forward(); updatePosition(-1, 0, 0) end

  face(2) while z < zT do turtle.forward(); updatePosition(0, 0, 1) end
  face(0) while z > zT do turtle.forward(); updatePosition(0, 0, -1) end
end

-- === RETURN TO START AND UNLOAD BEHIND ===
local function returnToStartAndUnload()
  print("📦 Returning to original start point to dump items...")

  goTo(startX, startY, startZ)
  faceExact(startDir)

  -- Dump behind
  turnLeft(); turnLeft()
  for i = 1, 16 do
    turtle.select(i)
    turtle.drop()
  end
  turnLeft(); turnLeft()

  print("✅ Dump complete. Returning to work...")
end

-- === REFUELING ===
local function refuelFromInventory()
  for i = 1, 16 do
    turtle.select(i)
    if turtle.refuel(0) then
      turtle.refuel()
      return true
    end
  end
  return false
end

local function checkFuel()
  local estReturn = math.abs(x - startX) + math.abs(y - startY) + math.abs(z - startZ) + FUEL_BUFFER
  if turtle.getFuelLevel() < estReturn then
    local sx, sy, sz, sd = x, y, z, dir
    print("⚠️ Low fuel. Returning to refuel...")
    returnToStartAndUnload()
    while not refuelFromInventory() do
      print("⌛ Waiting for fuel in inventory...")
      sleep(2)
    end
    goTo(sx, sy, sz)
    faceExact(sd)
  end
end

-- === MOVEMENT ===
local function tryForward()
  if isFull() then
    print("📦 Inventory full before move. Returning to dump...")
    local sx, sy, sz, sd = x, y, z, dir
    returnToStartAndUnload()
    checkFuel()
    goTo(sx, sy, sz)
    faceExact(sd)
  end

  checkFuel()
  while not turtle.forward() do
    turtle.dig()
    sleep(0.3)
  end
  turtle.digUp()
  turtle.digDown()
  if dir == 0 then updatePosition(0, 0, -1)
  elseif dir == 1 then updatePosition(1, 0, 0)
  elseif dir == 2 then updatePosition(0, 0, 1)
  elseif dir == 3 then updatePosition(-1, 0, 0)
  end
end

local function tryUp()
  checkFuel()
  while not turtle.up() do
    turtle.digUp()
    sleep(0.3)
  end
  updatePosition(0, -1, 0)
end

local function tryDown()
  checkFuel()
  while not turtle.down() do
    turtle.digDown()
    sleep(0.3)
  end
  updatePosition(0, 1, 0)
end

-- === DIG LAYER ===
local function digLayer()
  for row = 1, CHUNK_SIZE do
    for col = 1, CHUNK_SIZE - 1 do
      tryForward()
    end
    if row < CHUNK_SIZE then
      if row % 2 == 1 then
        turnRight(); tryForward(); turnRight()
      else
        turnLeft(); tryForward(); turnLeft()
      end
    end
  end

  -- Return to origin column
  if x > 0 then face(3) while x > 0 do turtle.forward(); updatePosition(-1, 0, 0) end end
  if x < 0 then face(1) while x < 0 do turtle.forward(); updatePosition(1, 0, 0) end end
  if z > 0 then face(0) while z > 0 do turtle.forward(); updatePosition(0, 0, -1) end end
  if z < 0 then face(2) while z < 0 do turtle.forward(); updatePosition(0, 0, 1) end end
  face(1)
end

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

print("Enter depth to dig:")
local depth = tonumber(read())
if not depth or depth <= 0 then
  print("❌ Invalid depth.")
  return
end

for layer = 1, depth, LAYER_HEIGHT do
  digLayer()
  if layer + LAYER_HEIGHT <= depth then
    print("⬇️ Descending to next layer...")
    for i = 1, LAYER_HEIGHT do tryDown() end
  end
end

returnToStartAndUnload()
print("✅ Chunk excavation complete. Turtle returned to start.")