--[[
More advanced fuel checking program.
]]

local count = 0
local refueled = false

print("My fuel level is: " .. tostring(turtle.getFuelLevel()))
print("Press E to exit")
print("Press L to refuel using lava")
print("Press C to refuel using coal")

while not refueled do
	local event, key = os.pullEvent("char")
	
	if key == "e" then
		print("Exiting script...")
		sleep(.5)
		break
	elseif key == "l" then
		if turtle.getFuelLimit() ~= "unlimited" then    --Figure out how many buckets are needed
			count = (turtle.getFuelLimit() - turtle.getFuelLevel()) / 1000
			print("I need " .. tostring(count) .. " lava buckets")
		else
			print("How many buckets would you like me to collect?")
			local buckets = ""
			while true do
				local event, key = os.pullEvent("char")
				if key == "enter" then
					if buckets ~= "" then
						break
					end
				elseif tonumber(key) then
					buckets = buckets .. key
				end
			end
			count = tonumber(buckets)
		end
		
		turtle.select(1)
		while true do
			print("Place a bucket in slot 1, then press any key.")
			local event, key = os.pullEvent("char")
			if turtle.getItemCount() ~= 0 then
				local data = turtle.getItemDetail()
				if data.name == "minecraft:bucket" then    --Check if the item is a bucket.
					if data.count == 1 then
						break
					else
						print("Too many buckets!")
					end
				else
					print("Not a bucket!")
				end
			end
			sleep(.5)
		end
		print("Refueling...")
		for i = 1, 2 do
			for j = 1, (count/2 + 1 - math.fmod(count,2)) do    --Round to the nearest whole number
				turtle.forward()
				turtle.placeDown()
				turtle.refuel()
			end
			turtle.turnRight()
			turtle.forward()
			turtle.placeDown()
			turtle.refuel()
			turtle.turnRight()
		end
		refueled = true
	elseif key == "c" then
		if turtle.getFuelLimit() ~= "unlimited" then
			local a = turtle.getFuelLimit() - turtle.getFuelLevel()
			print("I need " .. tostring(a / 80) .. " pieces of coal")
		end
		print("Place fuel in my inventory, then press any key.")
		local event, key = os.pullEvent("char")
		for i = 1,16 do
			turtle.select(i)
			turtle.refuel()
		end
		turtle.select(1)
		refueled = true
	else
		sleep(.5)
	end
end

if refueled then
	print("Done refueling!")
	if (turtle.getFuelLimit() ~= "unlimited") and (turtle.getFuelLevel() ~= turtle.getFuelLimit()) then
		print("My new fuel level is: " .. tostring(turtle.getFuelLevel()))
	else
		print("Fuel limit of " .. tostring(turtle.getFuelLimit()) .. " reached!")
	end
end