--require("follow_rail")

--PROGRESS_FILE = "torment_progress.txt"
PROGRESS_FILE = "oilrig.txt"

function turnCW(dir)
	if dir == 1 then
		turtle.turnRight()
	elseif dir == -1 then
		turtle.turnLeft()
	else
		error("bad dir " .. tostring(dir))
	end
end

function station_wheels()
	print("beginning wheel building step")
	local file = fs.open(PROGRESS_FILE, "r")
	local progress = tonumber(file.readAll())
	file.close()

	turtle.turnRight()
	turtle.forward()
	turtle.forward()
	turtle.turnLeft()

	print(progress, "levels already done")
	for i = 1,(progress*4) do
		turtle.down()
	end

	print("right gear gutter")
	for i = 1,4 do
		turtle.digDown()
		turtle.down()
		turtle.dig()
	end
	turtle.forward()
	-- currently under gears, at the bottom of the layer
	turtle.dig()
	turtle.forward()
	turtle.turnRight()
	turtle.dig()
	turtle.forward()
	turtle.digUp()
	turtle.up()
	turtle.turnLeft()
	turtle.turnLeft()
	-- cunter right side of wheel section
	print("cutting wheel section")
	local dir = 1
	for slice = 1,16 do
		for x = 1,6 do
			turtle.digUp()
			turtle.digDown()
			turtle.dig()
			turtle.forward()
		end
		turtle.digUp()
		turtle.digDown()
		turnCW(dir)
		turtle.dig()
		turtle.forward()
		turnCW(dir)
		dir = -dir
	end

	print("placing right wheels")
	turtle.turnLeft()
	turtle.forward()
	turtle.turnRight()
	turtle.forward()
	turtle.turnRight()
	-- TODO select wheels
	turtle.select(1)
	for w = 1,16 do
		turtle.back()
		turtle.place()
	end
	print("placing right cogs")
	-- TODO select cogs
	turtle.select(2)
	turtle.back()
	turtle.place()
	turtle.up()
	turtle.place()
	turtle.up()
	turtle.place()
	turtle.down()
	turtle.down()
	turtle.down()
	turtle.place()
	turtle.up()
	print("moving to left gutter")
	turtle.turnLeft()
	for i = 1, 4 do
		turtle.dig()
		turtle.forward()
	end
	turtle.turnRight()
	turtle.dig()
	turtle.forward()
	turtle.forward()
	-- now in a wheel center
	print("digging water gutter")
	turtle.turnRight()
	turtle.forward()
	turtle.forward()
	turtle.turnLeft()
	turtle.down()
	turtle.digDown()
	for i = 1,15 do
		turtle.forward()
		turtle.digDown()
	end
	print("placing left wheels")
	turtle.up()
	turtle.turnLeft()
	turtle.forward()
	turtle.forward()
	turtle.turnRight()
	-- TODO select wheels
	turtle.select(1)
	for i = 1,16 do
		turtle.back()
		turtle.place()
	end
	turtle.back()
	-- TODO select cogs
	turtle.select(2)
	turtle.digDown()
	turtle.down()
	print("placing left cogs")
	for y = 1,4 do
		turtle.dig()
		turtle.place()
		turtle.digUp()
		turtle.up()
	end

	print("returning to start")
	for i = 1,(progress*4) do
		turtle.up()
	end

	turtle.turnRight()
	turtle.forward()
	turtle.forward()
	turtle.turnLeft()

	file = fs.open(PROGRESS_FILE, "w")
	file.write(tostring(progress + 1))
	file.close()
end
function station_wood() end
function station_andesite() end

function run()
	--station_wood()
	--follow_rail()
	station_wheels()
	--follow_rail()
	--station_andesite()r
	--follow_rail()
end

run()