--DO NOT EDIT
local FUEL_SLOT = 1
local CHEST_FUEL_SLOT = 1
local ENDER_CHEST_SLOT = 2
local DIG_SLOT = 3

--save movments
function move(move, detect, dig, attack)
	if needsPitstop() then
		doPitstop()
	end

	local first = true
	while not move() do
		if detect() then
			turtle.select(DIG_SLOT)
			dig()
		else
			attack()
		end

		if not first then
			sleep(0.5)
		end
		first = false
	end
end

function moveForward()
	move(turtle.forward, turtle.detect, turtle.dig, turtle.attack)
end

function moveBack()
	if not turtle.back() then
		turn180()
		moveForward()
		turn180()
	end
end

function moveUp()
	move(turtle.up, turtle.detectUp, turtle.digUp, turtle.attackUp)
end

function moveDown()
	move(turtle.down, turtle.detectDown, turtle.digDown, turtle.attackDown)
end

function turn180()
	turtle.turnLeft()
	turtle.turnLeft()
end

--pitstop
function doPitstop()
	if turtle.getItemDetail(ENDER_CHEST_SLOT) == nil then
		if peripheral.getType("top") ~= "ender_chest" then
			error("No ender chest found.")
		end
	else
		if turtle.detectUp() then
			turtle.select(DIG_SLOT)
			turtle.digUp()
		end

		turtle.select(ENDER_CHEST_SLOT)
		turtle.placeUp()
		sleep(0.5)
	end

	local enderChest = peripheral.wrap("top")

	if enderChest == nil then
		error("Failed to wrap ender chest.")
	end


	if (not hasSpace()) or getMovingHome() then
		for i = 3, 16, 1 do
			while turtle.getItemCount(i) > 0 do
				local moved = false
				for j = 2, enderChest.getInventorySize(), 1 do
					if enderChest.pullItem("down", i, 64, j) ~= 0 then
						moved = true
					end
				end
				sleep(0.5)

				if not moved then
					sleep(2)
				end
			end
		end
	end

	while turtle.getFuelLevel() < 5 do
		local success = false

		local currentItem = turtle.getItemDetail(FUEL_SLOT)

		turtle.select(FUEL_SLOT)
		if currentItem ~= nil and not turtle.refuel(0) then
			turtle.dropUp()
		end

		currentItem = turtle.getItemDetail(FUEL_SLOT)

		if currentItem == nil then
			success = false
			local chestItem = enderChest.getStackInSlot(1)

			if chestItem ~= nil then
				if chestItem["burn_time"] == nil or chestItem["burn_time"] < 1 then
					if chestItem["id"] ~= "minecraft:bucket" then
						for i = 1, enderChest.getInventorySize(), 1 do
							local otherItem = enderChest.getStackInSlot(i)
							if otherItem == nil then
								enderChest.swapStacks(CHEST_FUEL_SLOT, i)
								success = true
								break
							end
						end
					end
				else
					enderChest.pushItem("down", 1, 64, FUEL_SLOT)
				end
			end
		else
			local fuelLevel = turtle.getFuelLevel()
			turtle.refuel(1)
			success = true

			if turtle.refuel(0) then
				local burnTime = turtle.getFuelLevel() - fuelLevel
				currentItem = turtle.getItemDetail(FUEL_SLOT)

				local burnCount = currentItem["count"]
				local availableBurn = turtle.getFuelLimit() - turtle.getFuelLevel()

				while burnCount * burnTime > availableBurn and burnCount > 0 do
					burnCount = burnCount - 1
				end

				turtle.refuel(burnCount)
			end
		end

		if not success then
			sleep(2)
		else
			currentItem = turtle.getItemDetail()
			if currentItem ~= nil and currentItem["name"] == "minecraft:bucket" then
				turtle.dropUp()
			end
		end
	end

	turtle.select(ENDER_CHEST_SLOT)
	turtle.digUp()
end

function needsPitstop()
	return (not hasSpace()) or turtle.getFuelLevel() < 5
end

function hasSpace()
	local count = 0
	for i = 3, 16, 1 do
		if turtle.getItemCount(i) == 0 then
			count = count + 1
		end
	end
	return count > 1
end

function readNumber(minVal)
	local num = -1
	repeat
		if num ~= -1 then
			print("Text is not a number.")
		end
		num = tonumber(read())

		if num ~= nil and num < minVal then
			print("Number is out of bound.")
			num = nil
		end

	until num ~= nil
	return num
end

--ore stuff
function isOre()
	local success, data = turtle.inspect()
	return checkOre(success, data)
end

function isOreUp()
	local success, data = turtle.inspectUp()
	return checkOre(success, data)
end

function isOreDown()
	local success, data = turtle.inspectDown()
	return checkOre(success, data)
end

function checkOre(success, data)
	if success then
		local name = data["name"]
		if name ~= nil then
			--Alternative name bypass
			if name == "Forestry:resources" or name == "TConstruct:SearedBrick"
					or name == "denseores:block0" or name == "rftools:dimensionalShardBlock"
					or name == "harvestcraft:salt" then
				return true
			end

			local index = string.find(name, ":")
			if index ~= nil then
				local part = string.lower(string.sub(name, index))
				local isOre = string.find(part, "ore")
				return isOre ~= nil
			end
		end
	end
	return false
end

--vein stuff
function mineVein()
	while true do
		if isOre() then
			veinMoveForward()
		elseif isOreUp() then
			veinMoveUp()
		elseif isOreDown() then
			veinMoveDown()
		else
			local success = false
			for i = 1, 3, 1 do
				veinMoveLeft()
				if isOre() then
					veinMoveForward()
					success = true
					break
				end
			end

			if not success then
				if not popVeinMovment() then
					return
				end
			end
		end
		sleep(0.5)
	end
end

function veinMoveForward()
	moveForward()
	pushToVeinStack(1)
end

function veinMoveUp()
	moveUp()
	pushToVeinStack(2)
end

function veinMoveDown()
	moveDown()
	pushToVeinStack(3)
end

function veinMoveLeft()
	turtle.turnLeft()
	pushToVeinStack(4)
end

function veinMoveRight()
	turtle.turnRight()
	pushToVeinStack(5)
end

function veinMoveBack()
	moveBack()
	pushToVeinStack(6)
end

function popVeinMovment()
	local direction = getFromVeinStack()

	if direction == nil then
		return false
	end

	if direction == 1 then
		moveBack()
	elseif direction == 2 then
		moveDown()
	elseif direction == 3 then
		moveUp()
	elseif direction == 4 then
		turtle.turnRight()
		removeLastVeinStack()
		return popVeinMovment()
	elseif direction == 5 then
		turtle.turnLeft()
		removeLastVeinStack()
		return popVeinMovment()
	elseif direction == 6 then
		moveForward()
	end

	removeLastVeinStack()

	return true;
end

function pushToVeinStack(direction)
	local stack = getVeinStack()

	if stack == nil then
		stack = {}
	end

	stack[#stack + 1] = direction

	stack = optimizeVeinStack(stack)
	saveVeinStack(stack, #stack)
end

function getFromVeinStack()
	local data = getVeinStack()

	if data ~= nil then
		return data[#data]
	end
	return nil
end

function optimizeVeinStack(data)
	local lastAction = 0
	local actionCount = 0

	local i = 1
	while i <= #data do
		--turn right and then left is somewhat useless
		if (data[i] == 4 and lastAction == 5) or
			(data[i] == 5 and lastAction == 4) then
			data = moveArrayContent(data, i + 1, 2)
			if #data < 1 then
				break
			end

			i = 1
			lastAction = 0
			actionCount = 0
		end

		if data[i] ~= lastAction then
			lastAction = 0
			actionCount = 0
		end

		if data[i] == 4 then
			lastAction = 4
			actionCount = actionCount + 1
		elseif data[i] == 5 then
			lastAction = 5
			actionCount = actionCount + 1
		end

		if actionCount == 3 then
			local newAction = 4
			if lastAction == 4 then
				newAction = 5
			end
			data = moveArrayContent(data, i + 1, 2)
			data[i - 2] = newAction

			i = 0
			lastAction = 0
			actionCount = 0
		end
		i = i + 1
	end
	return data
end

function moveArrayContent(array, startIndex, amount)
	local size = #array
	for i = startIndex, size + amount, 1 do
		array[i - amount] = array[i]
		array[i] = nil
	end
	return array
end

function removeLastVeinStack()
	local data = getVeinStack()
	saveVeinStack(data, #data - 1)
end

function saveVeinStack(data, length)
	if data ~= nil then
		local dataLeng = #data
		for i = length + 1, dataLeng, 1 do
			data[i] = nil
		end
	end

	if #data < 1 then
		data = nil
	end
	setVeinStack(data)
end

function getVeinStack()
	return getVariable("veinStack")
end

function setVeinStack(value)
	setVariable("veinStack", value)
end

function getVariable(name)
	local vars = getVariables()
	if vars ~= nil then
		return vars[name]
	end
	return nil
end

function setVariable(name, value)
	local vars = getVariables()

	if vars == nil then
		vars = {}
	end

	vars[name] = value

	local handle = fs.open("Vars.dat", "w")
	handle.writeLine(textutils.serialize(vars))
	handle.close()
end

function getVariables()
	local handle = fs.open("Vars.dat", "r")

	if handle ~= nil then
		local raw = handle.readAll()
		handle.close()

		if raw ~= nil then
			return textutils.unserialize(raw)
		end
	end
	return nil
end

function getStripLength()
	return getVariable("stripLength")
end

function setStripLength(value)
	setVariable("stripLength", value)
end

function getStripPos()
	return getVariable("stripPos")
end

function setStripPos(value)
	setVariable("stripPos", value)
end

function getStripOnGround()
	return getVariable("stripGround")
end

function setStripOnGround(value)
	return setVariable("stripGround", value)
end

function getStripHasDug()
	return getVariable("stripHasDug")
end

function setStripHasDug(value)
	return setVariable("stripHasDug", value)
end

function getStripHasFinished()
	return getVariable("stripHasFinished")
end

function setStripHasFinished(value)
	return setVariable("stripHasFinished", value)
end

function digStrip(gotoStart)
	local length = getStripLength()

	if not getStripHasFinished() then
		while getStripPos() <= length or (not getStripHasDug()) do
			mineVein()

			if getStripHasDug() then

				moveForward()
				setStripPos(getStripPos() + 1)
				setStripHasDug(false)
			else
				if getStripOnGround() then
					moveUp()
					setStripOnGround(false)
				else
					moveDown()
					setStripOnGround(true)
				end
				setStripHasDug(true)
			end
		end
		setStripHasFinished(true)
	end

	mineVein()

	if not getStripOnGround() then
		moveDown()
		setStripOnGround(true)
		mineVein()
	end

	if gotoStart then
		while getStripPos() > 1 do
			moveBack()
			setStripPos(getStripPos() - 1)
			sleep(0.5)
		end
	end
end

function clearStripParams()
	setStripLength(0)
	setStripPos(1)
	setStripOnGround(true)
	setStripHasDug(false)
	setStripHasFinished(false)
end

function getIsPreparing()
	return getVariable("isPreparing")
end

function setIsPreparing(value)
	return setVariable("isPreparing", value)
end

function getSpacing()
	return getVariable("spacing")
end

function setSpacing(value)
	return setVariable("spacing", value)
end

function getDepth()
	return getVariable("depth")
end

function setDepth(value)
	return setVariable("depth", value)
end

function getStripCount()
	return getVariable("stripCount")
end

function setStripCount(value)
	return setVariable("stripCount", value)
end

function getRemainingStripCount()
	return getVariable("remainStripCount")
end

function setRemainingStripCount(value)
	return setVariable("remainStripCount", value)
end

function getMovingHome()
	return getVariable("movHome")
end

function setMovingHome(value)
	return setVariable("movHome", value)
end

function prepareNextStrip()
	if not getIsPreparing() then
		turtle.turnRight()
		setIsPreparing(true)

		clearStripParams()
	end

	setStripLength(getSpacing() + 1)
	digStrip(false)

	clearStripParams()

	turtle.turnLeft()
	setIsPreparing(false)
	setStripHasFinished(false)
end

function goHome()
	if not getMovingHome() then
		turtle.turnLeft()
		setMovingHome(true)
		setStripPos(1)
	end

	local length = ((getStripCount() - 1) * (getSpacing() + 1))

	while getStripPos() <= length do
		moveForward()
		setStripPos(getStripPos() + 1)
	end

	doPitstop()

	turtle.turnRight()

	fs.delete("Vars.dat")

	print("All strips cleared.")
	error()
end

function initVars()
	clearStripParams()
	setIsPreparing(false)
	setMovingHome(false)

	print("Enter the spacing between the strips.")
	setSpacing(readNumber(0))

	print("Enter the depth of each strip.")
	setDepth(readNumber(1))

	print("Enter the amount of strips.")
	local stripCount = readNumber(1)
	setStripCount(stripCount)
	setRemainingStripCount(stripCount)
end

if getSpacing() == nil then
	initVars()
end

while true do
	if getMovingHome() then
		goHome()
	end

	if getIsPreparing() then
		prepareNextStrip()
	elseif not getStripHasFinished() then
		setStripLength(getDepth())
		digStrip(true)
		clearStripParams()

		local remStrips = getRemainingStripCount() - 1
		setRemainingStripCount(remStrips)
		if remStrips < 1 then
			goHome()
		end

		prepareNextStrip()
	end
end