cords = {}
cords["x"] = 0
cords["z"] = 0
itemInfo = {}

function distance()
return cords["x"] + cords["z"]
end

function checkFuel()
	if turtle.getFuelLevel() < cords["x"] then
		for i = 1,16 do
		itemInfo = turtle.getItemDetail(i)
			if itemInfo["name"] == "minecraft:coal" then
			turtle.select(i)
			turtle.refuel(itemInfo["count"])
		    end
		end
	end
end

function forward(blocksF)
turtle.digDown()
for repeats = 1,blocksF do
checkFuel()
turtle.dig()
turtle.forward()
turtle.digDown()
turtle.digUp()
logCordX(1)
end
end

function back(blocksB)
turtle.turnLeft()
turtle.turnLeft()
for repeats = 1,blocksB do
turtle.dig()
turtle.forward()
if turtle.inspectUp() == "minecraft:chest" then
print("Chest above")
else
turtle.digUp()
end
turtle.digDown()
logCordX(-1)
end
turtle.turnLeft()
turtle.turnLeft()
end

function logCordX(changeX)
cords["x"] = cords["x"] + changeX
end

function right()
turtle.turnRight()
turtle.dig()
turtle.forward()
turtle.digUp()
turtle.digDown()
turtle.turnLeft()
logCordZ(-1)
end

function left()
turtle.turnLeft()
turtle.dig()
turtle.forward()
turtle.digUp()
turtle.digDown()
turtle.turnRight()
logCordZ(1)
end

function logCordZ(changeZ)
cords["z"] = cords["z"] + changeZ
end

function sRight(blocksR)
turtle.turnRight()
for repeats = 1,blocksR do
turtle.dig()
turtle.forward()
if turtle.inspectUp() == "minecraft:chest" then
print("Chest above")
else
turtle.digUp()
end
turtle.digDown()
logCordZ(-1)
end
turtle.turnLeft()
end

function sLeft(blocksL)
turtle.turnLeft()
for repeats = 1,blocksL do
turtle.dig()
turtle.forward()
if turtle.inspectUp() == "minecraft:chest" then
print("Chest above")
else
turtle.digUp()
end
turtle.digDown()
logCordZ(1)
end
turtle.turnRight()
end

function goHome()
	if cords["x"] > 0 then
       	back(cords["x"])
		elseif cords["x"] < 0 then
		Travelx = -1 * cords["x"]
		forward(Travelx)
	end
		if cords["z"] > 0 then
		sRight(cords["z"])
			elseif cords["z"] < 0 then
			Travelz = -1 * cords["z"]
			sLeft(Travelz)
		end
 for i = 1,16 do
 turtle.select(i)
 turtle.dropUp()
end
end


function checkInv(row)
for i = row,16 do
turtle.select(i)
if turtle.getItemDetail ~= nil then
status = true
end
end
if status then
goHome()
end
end