Earth woodfarm

--DONE: Check Fuel level
--DONE: Pickup Fuel
--DONE: Refuel
--DONE: Pickup Saplings
--DONE: Pickup Bonemeal
--DONE: Left or Right orientation
--TODO: Plant Saplings
--TODO: Use Bonemeal
--TODO: Chop bottom blocks
--TODO: Chop till top
--TODO: Return to start
--DONE: Drop-off everything
--DONE: Wait x minutes
--TODO: Restart after server down

function printUsage()
    print("Usage:")
    print("WoodFarm")
    print("Everyting else will be done automatically..")
    print("If there is a 10x10 fenced area, and all chests are sitting where they should.")
    print("Drop-off chest, Fuel chest, Saplings chest, Bonemeal chest.")
end

function turnRight()
    turtle.turnRight()
    o = o + 1

    -- we want to stay between 0 and 4
    if o > 3 then
        o = o % 4
    end
end

function turnLeft()
    turtle.turnLeft()
    o = o - 1

    if o < 0 then
        o = o + 4
    end
end

function forward()
    turtle.forward()

    o = o % 4
    if o == 0 then
        x = x + 1
    elseif o == 1 then
        y = y + 1
    elseif o == 2 then
        x = x - 1
    elseif o == 3 then
        y = y - 1
    else
        -- Not good
        error()
    end
end

function goToCenter()

end

function returnHome()
    print("Returning home...")
    print("x = " .. x)
    print("y = " .. y)
    print("z = " .. z)
    print("o = " .. o)

    if x > 0 then
    print("1")
        while o ~= 2 do
            turnRight()
        end
    elseif x < 0 then
    print("2")
        while o ~= 0 do
            turnRight()
        end
    else
    print("3")
        --nothing?
    end

    while x ~= 0 do
    print("4")
        forward()
    end

    if y > 0 then
    print("5")
        print("Go left")
        while o ~= 3 do
    print("6")
turnRight()
        end
    elseif y < 0 then
    print("7")
        print("Go right")
        while o ~= 1 do
    print("8")
turnRight()
        end
    else
    print("9")
        --nothing?
    end

    while y ~= 0 do
    print("10")
        forward()
    end

    while o ~= 0 do
    print("11")
        turnRight()
    end
end

function moveToSide()
    if orientation == "right" then
        turnRight()
        forward()
        turnLeft()
        return
    elseif orientation == "left" then
        turnLeft()
        forward()
        turnRight()
        return
    else
        print("Shouldn't be here!")
    end
    error()
end

-- check if fuel is below 10000, and add fuel if so
function checkAndReFuel()
    -- go to fuel chest
    moveToSide()

    if turtle.getFuelLevel() >= 10000 then
        return
    end

    -- we should be by the fuel chesst
    if not turtle.detect() then
        print("Nothing to get fuel from")
        error()
    end

    while turtle.getFuelLevel() < 20000 do
        pickup = false
        turtle.select(1)
        while not pickup do -- let's try untill we get something
            pickup = turtle.suck()
        end

        turtle.select(1)
        if not turtle.refuel() then
            print("No fuel in the fuel chest!")
            error()
        end
    end
end

-- find out if we go left or right
function checkOrientation()
    if not orientation == nil then
        return
    end

    turnRight()
    if turtle.detect() then
        print("There is something to the right.. Let's try left.")
    else
        print("The right is free! We found our orientation!")
        orientation = "right"
        turnLeft()
        return
    end

    turnLeft()
    turnLeft()
    if turtle.detect() then
        print("There is something to the left aswell.. WTF!")
    else
        print("The left is free! We found our orientation!")
        orientation = "left"
        turnRight()
        return
    end

    -- if we get here we are lost
    error()
end

-- place items in chest
function dropOff()
    if not turtle.detect() then
        print("There is nothing in front..! Halp!")
        error()
    end

    for slot = 1, 16 do
        dropped = false
        turtle.select(slot)
        if turtle.getItemCount(slot) > 0 then
            while not dropped do -- lets try this untill success
                dropped = turtle.drop()
            end
        end
    end
end

function pickup(something, slot, needed)
    -- go to next chest
    moveToSide()

    -- we should be by a chesst
    if not turtle.detect() then
        print("Nothing to get " .. something .. "from")
        error()
    end

    while turtle.getItemCount(slot) < needed do
        pickuped = false
        turtle.select(slot)
        while not pickuped do -- let's try untill we get something
            pickuped = turtle.suck()
        end
    end
end

function pickupSaplings()
    pickup("Sapling", 1, 4)
end

function pickupBonemeal()
    pickup("Bonemeal", 2, 1)
end

-- main fuction that stands for one cycle
function woodFarm()
    dropOff() -- nice clean start
    checkOrientation() -- where do we want to go today
    checkAndReFuel() -- check fuel level and refill
    pickupSaplings() -- get some saplings
    pickupBonemeal() -- get some bonemeal
--  goToCenter() -- walk to center
    returnHome() -- go to the start
end

-- ---------- Running programm ----------
-- Check argument usage
tArgs = { ... }
if #tArgs ~= 0 then
    printUsage()
    return
end

-- Set params
orientation = nil

x = 0
y = 0
z = 0
o = 0

repeat
    if pcall(woodFarm) then
        -- nothing to report, sleep and start over.
        os.sleep(900)
    else
        print("Horrible nasty stuff happened.. Stopping program.")
        return
    end
until false