local tArgs = { ... }

local digDownAmount
local digDeepAmount
local stripeAmount

local fuelSlot = 1

local stripeIndex = 1
local digDeepIndex = 1

local inventoryFull = false

if not (#tArgs == 3) then
  print ("You need exactly three parameter!")
  return
else
  digDownAmount = tonumber(tArgs[1])
  digDeepAmount = tonumber(tArgs[2])
  stripeAmount = tonumber(tArgs[3])
end

local function forward()
  while not turtle.forward() do
    if not turtle.dig() then
      turtle.attack()
      sleep(0.5)
    end
  end
end

local function up()
  while not turtle.up() do
    if not turtle.digUp() then
      turtle.attackUp()
      sleep(0.5)
    end
  end
end

local function down()
  while not turtle.down() do
    if not turtle.digDown() then
      turtle.attackDown()
      sleep(0.5)
    end
  end
end

local function CheckFuel()
  if (turtle.getFuelLevel() >= 100) then
    return true
  else
    local oldSlot = turtle.getSelectedSlot()
    turtle.select(FuelSlot)
    if turtle.refuel(100) then
      turtle.select(oldSlot)
      return true
    else
      turtle.select(oldSlot)
      return false
    end
  end
end

local function FindChest()
  while not ChestFound do
    for i = 1, 4 do
      if turtle.detect() then
        print("Chest found... starting mine operation!")
        return
      else
        turtle.turnRight()
      end
    end
    print("No Chest found.. place a chest near turtle to start mining")
    sleep(3)
  end
end

local function mineToBase(amount)
  turtle.select(fuelSlot + 1)
  for i = 1, amount do
    if CheckFuel() then
      down()
    else
      print("No fuel available! :(")
      return
    end
    turtle.placeUp()
  end
  print("Reached target y-level.. start mining")
end

local function moveToTop(amount)
  turtle.select(fuelSlot + 1)
  for i = 1, amount do
    if CheckFuel() then
      up()
    else
      print("No fuel available! :(")
      return
    end
    turtle.placeDown()
  end
  print("Reached start level.. empting inventory")
end

-- Returns false if inventory full
local function ContinueDigging()
  -- Check inventory
  if (turtle.getItemCount(16) > 0) then
    return false
  end

  return true
end

local function DigRow()
  turtle.dig()
  forward()
  turtle.digDown()
  turtle.digUp()
end

local function EmptyInventory()
  if not turtle.detect() then
    print("No Block to place items into")
    return
  end
  -- Fuel is in slot 1, never empty this
  for i = 2, 16 do
    turtle.select(i)
    turtle.drop()
  end
  print("Inventory successfully emptied")
end

local function FirstMining(amount)
  for i = 1, amount do
    if ContinueDigging() and CheckFuel() then
      DigRow()
      digDeepIndex = digDeepIndex + 1
      -- print("digDeepIndex = "..digDeepIndex)
    else
      break
    end
  end

  turtle.turnLeft()
  turtle.turnLeft()
  while (digDeepIndex > 1) do
    forward()
    digDeepIndex = digDeepIndex - 1
  end
  turtle.turnLeft()
  turtle.turnLeft()
end

local function MiningLoop(amount)
  for i = 1, amount do
    stripeIndex = i
    FirstMining(digDeepAmount)
    if ContinueDigging() and CheckFuel() then
      -- print("Successfully mined stripe #"..i)
    else
      print("Full inventory or out of fuel, aborted mining stripe #"..i)
      inventoryFull = true
      break
    end

    if (i < amount) then
      turtle.turnRight()
      for j = 1, 3 do
          forward()
      end
    turtle.turnLeft()
    end
  end

  turtle.turnLeft()
  for i = 1, (stripeIndex - 1) * 3 do
    forward()
  end
  turtle.turnRight()
end

local function Main()
  inventoryFull = false
  FindChest()
  mineToBase(digDownAmount)
  MiningLoop(stripeAmount)
  moveToTop(digDownAmount)
  EmptyInventory()
  if not inventoryFull then
    print ("Run successfully!")
    return
  else
    print ("Run partially, another iteration starting...")
    Main()
  end
end

print("Place fuel reserves in slot 1 (upper left) if desired and hit any key to start")
os.pullEvent("key")
Main()