local function isGrown()
    local inspected, data = turtle.inspectDown()
    return (inspected and data["state"]["age"] == 7)
end

local function farmTile()
    turtle.digDown()
    turtle.select(1)
    turtle.placeDown()
end

local function empty()
    for i = 2, 15, 1 do
        turtle.select(i)
        turtle.drop(turtle.getItemCount(i))
    end
    turtle.select(1)
end

local function orientTurtle()
    local count = 0
    while count < 2 do
        if turtle.detect() then
            if peripheral.hasType("front", "inventory") then
                empty()
            end
            count = count + 1
        end
        if count >= 2 then
            break
        end
        turtle.turnRight()
    end

    turtle.turnLeft()
    turtle.turnLeft()
end


local function farmField()
    local direction = true
    local function turn(update)
        update = update or false
        if direction then
            turtle.turnLeft()
            if update then
                direction = false
            end
        else
            turtle.turnRight()
            if update then
                direction = true
            end
        end
    end

    local function farmWhenGrown()
        if isGrown() then
            print("found grown tile")
            farmTile()
        end
    end

    while true do
        farmWhenGrown()
        while not turtle.detect() do
            turtle.forward()
            farmWhenGrown()
        end
        turn()
        if not turtle.forward() then
            break
        end
        turn(true)
    end
end

local function refuel()
    turtle.select(16)
    local count = turtle.getItemCount(16)
    turtle.refuel(count)
    turtle.select(1)
end

while true do
    print("farming field")
    refuel()
    orientTurtle()
    farmField()
    print("waiting for 120 seconds")
    sleep(120)
end