os.loadAPI("try")
os.loadAPI("check")

local dir = true
local slot = 1
local inv = 0
local tArgs = { ... }
if # tArgs ~= 2 then
	print("Usage: patch <width> <height>")
	return
end

width = tonumber(tArgs[1])
height = tonumber(tArgs[1])

local maxBlocks = width * height

for i = 1,16 do
	inv = inv + turtle.getItemCount(i)
end

if maxBlocks > inv then
	print("Running this script may require more blocks than are available. Are you sure you want to continue? (Y/N)")
end

while true do
	local event, char = os.pullEvent("char")
	if char == "y" then
		break
	elseif char == "n" then
		return
	else
		sleep(0.2)
	end
end

local function slotCheck()
	while turtle.getItemCount(slot) == 0 do
		slot = slot + 1
	end
	turtle.select(slot)
end

for i = 1,width do
	for j = 1,height do
		slotCheck()
		if not turtle.place() and not turtle.detect() then
			turtle.attack()
		end
		if j ~= height then
			if dir then
				if not try.up() then
					print("Cannot move up! Exiting script...")
					return
				end
			elseif not try.down() then 
				print("Cannot move down! Exiting script...")
				return
			end
		end
	end
	if i ~= width then
		turtle.turnRight()
		if not try.forward() then
			print("Cannot move forward! Exiting script...")
			return
		end
		turtle.turnLeft()
	end
end