mega_mine

local command_arguments= {...}

local command_right_meters= tonumber(command_arguments[1])
local command_forward_meters= tonumber(command_arguments[2])

local k_max_depth= 3
local k_refueling_level= 10000

function travel_forward(
	forward_meters)

	for index= 1,forward_meters do
		repeat
			while turtle.dig() do
				-- NOTE: We're potentially clearing stuff as it's falling in front of us.
			end

			local moved_forward= turtle.forward() -- NOTE: We might fail if something just now fell in front of us.

			if not moved_forward then
				sleep(0.5) -- Make sure we're not tight-looping the server.
			end
		until moved_forward
	end
end

function travel_down(
	down_meters)

	local result_moved_meters= 0

	for index= 1,down_meters do

		local below_is_filled, below_data= turtle.inspectDown()

		if (below_is_filled and (below_data.name == "minecraft:bedrock")) then
			print("Found bedrock!")
			break
		end

		turtle.digDown()
		local moved_down= turtle.down()

		if (moved_down) then
			result_moved_meters= (result_moved_meters + 1)
		end
	end

	return result_moved_meters
end

function travel_up(
	up_meters)

	for index= 1,up_meters do
		repeat
			while turtle.digUp() do
				-- NOTE: We're potentially clearing stuff as it's falling on our head.
			end

			local moved_up= turtle.up() -- NOTE: We might fail if something just now fell onto us.

			if not moved_up then
				sleep(0.5) -- Make sure we're not tight-looping the server.
			end
		until moved_up
	end
end

function mega_mine(
	right_meters,
	forward_meters)

	for right_index= 1,right_meters do

		for bore_index= 1,math.ceil(forward_meters / 2) do

			local forward_index= (((bore_index - 1) * 2) + 1)

			-- Move to the bore hole.
			do
				travel_forward(forward_index-1)
				turtle.turnRight()
				travel_forward(right_index-1)
				turtle.turnLeft()
			end

			-- Bore a two-column tunnel (or just one column if we're at the end).
			do
				local moved_down_meters= travel_down(k_max_depth)

				if (forward_index < forward_meters) then
					travel_forward(1)
					forward_index= (forward_index + 1)
				end

				travel_up(moved_down_meters)
			end

			-- Return to the depot.
			do
				turtle.turnLeft()
				travel_forward(right_index - 1)
				turtle.turnLeft()
				travel_forward(forward_index - 1)
			end

			-- Empty the entire inventory into the depot.
			for slot_index= 1,16 do
				turtle.select(slot_index)
				turtle.drop()
			end

			turtle.turnRight()

			-- Refuel.
			while (turtle.getFuelLevel() < k_refueling_level) do

				local original_fuel_level= turtle.getFuelLevel()

				turtle.suck(1)
				local refuel_success= turtle.refuel(1)

				if refuel_success then
					print("Fueling +" .. (turtle.getFuelLevel() - original_fuel_level) .. ", now " .. turtle.getFuelLevel() .. "/" .. k_refueling_level .. ".")
				else
					print("Failed to refuel, waiting for fuel to arrive.")
					sleep(3.0)
				end
			end

			turtle.turnRight()
		end
	end
end

mega_mine(command_right_meters, command_forward_meters)