ValuableFinderv3

depth = 0
maxOperations = 1
fuelThreshold = 30
abortDueToFuel = false
useChests = true
descending = true
ascending = true
dropJunk = true

function forceMove(direction)
	if direction == "up" then
		while not turtle.up() do
			turtle.digUp()
		end
	end
	if direction == "down" then
		while not turtle.down() do
			turtle.digDown()
		end
	end
	if direction == "forward" then
		while not turtle.forward() do
			turtle.dig()
		end
	end
end

function forcePlace(direction)
	if direction == "up" then
		while not turtle.placeUp() do
			turtle.digUp()
		end
	end
	if direction == "down" then
		while not turtle.placeDown() do
			turtle.digDown()
		end
	end
	if direction == "forward" then
		while not turtle.place() do
			turtle.dig()
		end
	end
end

function fuel()
	print("Attempting to refuel with something in inventory...")
	local fuelTable = {"minecraft:coal", "minecraft:lava_bucket"}
	local successfulRefuel = false
	for i = 1, 16, 1 do
		local itemData = turtle.getItemDetail(i)
		if itemData then
			for k, v in ipairs(fuelTable) do
				if itemData.name == v then
					turtle.select(i)
					turtle.refuel()
					turtle.select(1)
					successfulRefuel = true
				end
			end
		end
	end

	return successfulRefuel
end

function isValuable()
	local junkTable = {"minecraft:stone", "minecraft:dirt", "minecraft:gravel", "minecraft:sand", "minecraft:torch"}
	local valuable = true

	local isBlock, blockData = turtle.inspect()
		if isBlock == true then
			--print("There's something here. Block data:")
			--print(blockData.name)
			--print(blockData.metadata)
			for k, v in ipairs(junkTable) do
				if blockData.name == v then
					--print("This is junk.")
					valuable = false
					break
				end
			end
		else
			--print("There isn't anything here.")
			valuable = false
		end
	if valuable then
		--print("There's something valuable here!")
		return true

	else
		--print("Nothing interesting here. Moving on")
		return false
	end
end

function checkFreeSlot()
	for i = 1, 16, 1 do
		if turtle.getItemCount(i) <= 0 then
			return i
		end
	end
	return -1
end

function throwAwayJunk() --Finds junk in inventory and throws it away
	local junkTable = {"minecraft:stone", "minecraft:dirt", "minecraft:gravel", "minecraft:sand"}
	local successful = false
	for i = 1, 16, 1 do
		local itemData = turtle.getItemDetail(i)
		if itemName then
			for k, v in ipairs(fuelTable) do
				if itemData.name == v then
					print("Throwing away ", itemData.name)
					turtle.select(i)
					turtle.dropDown()
					turtle.select(1)
					successful = true
				end
				if successful then break end
			end
		end
	end
	return successful
end



function checkSides()
	for i = 0, 3, 1 do
		if isValuable() then
			turtle.dig()
		end
		turtle.turnRight()
	end
end

function isBottomEmpty()
	local isBlock, blockData = turtle.inspect()
	if isBlock then
		return true
	else
		return false
	end
end

function isBottomBedrock()
	local isBlock, blockData = turtle.inspectDown()
	if isBlock then
		if blockData.name == "minecraft:bedrock" then
			print("We've hit bedrock!")
			return true
		else
			return false
		end
	else
		return false
	end
end

function knightMove()
	print("Knight move")
	forceMove("forward")
	forceMove("forward")

	turtle.turnRight()

	forceMove("forward")
	turtle.turnLeft()
end

function findChestInInventory()
	local chestSlot = -1
	for i = 1, 16, 1 do
		local data = turtle.getItemDetail(i)
		if data then
			if data.name == "minecraft:chest" then
				chestSlot = i
				print("Chest found in slot: " , chestSlot)
				break
			end
		end
	end
	return chestSlot
end

function isChestInInventory()
	local foundChest = false
	for i = 1, 16, 1 do
		local data = turtle.getItemDetail(i)
		if data then
			if data.name == "minecraft:chest" then
				foundChest = true
				break
			end
		end
	end
	return foundChest
end

function returnToSurface()
	print("Let's go back up...")

	while depth ~= 0 do
		if turtle.up() then
			depth = depth - 1
		else
			print("Obstruction detected...")
			turtle.digUp()
		end
	end
end

function closeHole()
	local junkTable = {"minecraft:stone", "minecraft:dirt"}
	local successful = false
	for i = 1, 16, 1 do
		local itemData = turtle.getItemDetail(i)
		if itemData then
			for k, v in ipairs(junkTable) do
				if itemData.name == v then
					turtle.select(i)
					turtle.placeDown()
					turtle.select(1)
					successful = true
				end
			end
		end
	end

	return successful
end

function closeHoleAbove()
	local junkTable = {"minecraft:stone", "minecraft:dirt"}
	local successful = false
	for i = 1, 16, 1 do
		local itemData = turtle.getItemDetail(i)
		if itemData then
			for k, v in ipairs(junkTable) do
				if itemData.name == v then
					turtle.select(i)
					turtle.placeUp()
					turtle.select(1)
					successful = true
				end
			end
		end
	end

	return successful
end

function chestDump()
	local itemsDeposited = 0
	print("Chest dumping")
	turtle.select(findChestInInventory())
	forcePlace("down")
	for a = 1, 16 do
		turtle.select(a)
		local data = turtle.getItemDetail()
		if data then
			if data.name ~= "minecraft:chest" then
				turtle.dropDown()
				itemsDeposited = itemsDeposited + 1
			end
		end
	end

	print(itemsDeposited, " different items deposited.")
	if not isChestInInventory() then
		printError("That was the last chest! I won't use anymore for the rest of the operation")
		useChests = false
	end

	turtle.select(1)
end

----------------Program Starts Here----------------

print("Checking Fuel")
print("Fuel level is ", turtle.getFuelLevel())
if turtle.getFuelLevel() <= fuelThreshold then
	print("Fuel low (", turtle.getFuelLevel(), ")! Attempting refuel")
		if not fuel() then
			repeat
				printError("There is not enough fuel to run an operation. Please add more and press enter")
				print("Or, type a to abort")
				local decision = io.read()
				if decision == "a" then error("Aborted") end
			until fuel()
		else
			print("Refuel successful: ", turtle.getFuelLevel())
		end
else
	print("Fuel level OK")
end

print("Checking for chests")
if not isChestInInventory() then
	repeat
		printError("No chests found! Please add chests to inventory and press enter to continue.")
		print("Type c to continue without using chests, or a to abort")

		local decision = io.read()
		if decision == "c" then
			useChests = false
			break
		end
		if decision == "a" then
			error("Aborted")
		end
	until findChestInInventory() ~= -1
else
	print("Chest found in ", findChestInInventory())
end



print("Please specify number of operations. It must be a positive number")
repeat
maxOperations = io.read()
maxOperations = tonumber(maxOperations)
if maxOperations == nil or maxOperations <= 0 then
	print("Invalid entry!")
end
until maxOperations ~= nil and maxOperations > 0

print("Let's go!")

for operations = 1, maxOperations do
	print("Current operation: ", operations)
	while descending do
		if depth == 2 then
			print("Closing Hole")
			if not closeHoleAbove() then
				print("I could not close the hole for some reason.")
			end
		end
		checkSides()

		if isBottomBedrock() then
			descending = false
			break
		end

		turtle.digDown()

		if turtle.getFuelLevel() <= fuelThreshold then
				print("Fuel low (", turtle.getFuelLevel(), ")! Attempting refuel")
				if not fuel() then
					abortDueToFuel = true
					returnToSurface()
					break
				else
					abortDueToFuel = false
					print("Refuel successful")
				end
			end

		if dropJunk then
			if checkFreeSlot() == -1 then throwAwayJunk() end
		end
		turtle.down()
		depth = depth + 1
	end

	if not abortDueToFuel then
		knightMove()

		while ascending do
			if turtle.getFuelLevel() <= fuelThreshold then
				print("Fuel low (", turtle.getFuelLevel(), ")! Attempting refuel")
				if not fuel() then
					abortDueToFuel = true
					print("No fuel to refuel with! Stopping after this ascent operation")
				else
					abortDueToFuel = false
					print("Refuel successful")
				end
			end

			checkSides()

			if depth <= 0 then
				ascending = false
				break
			end

			turtle.digUp()
			if turtle.up() then
				depth = depth - 1
			else
				print("Obstruction detected...")
				turtle.digUp()
			end
		end
	end

	if not closeHole() then
		print("Uh oh, I have nothing to close the hole with")
	end



	if operations >= maxOperations or abortDueToFuel == true then
		if useChests then
			forceMove("up")
			chestDump()
			break
		else
			break
		end
	else
		if useChests then
			forceMove("up")
			chestDump()
			knightMove()
			forceMove("down")
		else
			knightMove()
		end
	end

	descending = true
	ascending = true
end

print("Done! Remaining fuel: ", turtle.getFuelLevel())

if abortDueToFuel then
	print("The operation may be incomplete due to lack of fuel.")
end