-- mJ1S30HC
-- slots: seeds, fuel
-- maybe use glass slabs and an ender chest


local plotLength = 8
local plotWidth = 8
local harvestTime = 15
local growTime = 900

local useChest = false

local function wait(secs)
	for sec = secs, 0, -5 do
		term.clear()
		term.setCursorPos(1,1)
		print(sec)
		if turtle.getItemCount(1) == 0 then
			break
		end
		sleep(5)
	end
	term.clear()
end

local function resetPosition()
	repeat until not turtle.up()
	repeat until not turtle.forward()
	while turtle.detect() do turtle.turnRight() end

	while not rs.getInput("left") do
		if not turtle.forward() then
			turtle.turnRight()
		end
	end
end

local function dropExcess()
	for slot = 1, 16 do
		if turtle.getItemCount(slot) ~= 0 then
			turtle.select(slot)
			if slot == 1 then
				turtle.drop(turtle.getItemCount(slot) - 1)
			elseif slot ~= 2 then
				turtle.drop()
			end
		end
		sleep(0)
	end
	turtle.select(1)
end

local function harvest()
	rs.setOutput("top", true)
	wait(harvestTime)
	rs.setOutput("top", false)

	if useChest then
		repeat until turtle.forward()
		turtle.turnLeft()
		dropExcess()
		turtle.turnRight()
	end

	repeat until not turtle.forward()
	turtle.down()
	repeat until not turtle.suckDown()
	turtle.up()
	turtle.back()
	turtle.turnRight()
end

local function plant()

	turtle.select(1)
	local curX
	local curY

	curY = 1
	while curY <= plotLength do
	curX = 1
	while curX <= plotWidth do

		if turtle.getItemCount(1) > 1 then
			turtle.placeDown()
		end

		if curX == plotWidth then
			if curY < plotLength then
				if curY % 2 == 1 then
					turtle.turnRight()
					repeat until turtle.forward()
					turtle.turnRight()
				else
					turtle.turnLeft()
					repeat until turtle.forward()
					turtle.turnLeft()
				end
			end
		else
			repeat until turtle.forward()
		end

	curX = curX + 1
	end
	curY = curY + 1
	end

end

while turtle.getItemCount(1) ~= 0 do

	turtle.select(1)
	while turtle.getFuelLevel() < 128 do
		while turtle.getItemCount(2) < 2 do
			print("Out of Fuel")
			sleep(1)
		end
		turtle.select(2)
		turtle.refuel(1)
		turtle.select(1)
	end

	resetPosition()
	harvest()
	plant()
	wait(growTime)


end