if posx == nil then posx = 1 end
if posy == nil then posy = 0 end

if fieldx == nil then fieldx = 9 end
if fieldy == nil then fieldy = 9 end

if wait == nil then wait = 5 end
if waitafter == nil then waitafter = true end

function coord()
print("Position: "..posx.." / "..posy)
end

function iposx()
posx = posx + 1
end

function iposy()
posy = posy + 1
end

function dposx()
posx = posx - 1
end

function dposy()
posy = posy - 1
end

function mine()
    print("doing stuff here")
end

function move(dx, dy)
    moveDirX(posx, dx)
    moveDirY(posy, dy)
end

function moveDirX(ax, dx)
    if ax == 0 then step(dx, 1) else
        delta = ax-dx
        step(delta, 0)
    end
end

function moveDirY(ay, dy)
    if ay == 0 then step(dy, 1) else
        delta = ay-dy
        step(delta, 1)
    end
end

function betrag(zahl1)
    if zahl1 < 0 then return zahl1 * -1
    else return zahl1
    end
end

function step(count, axis)
    if axis == 0 then
        if count > 0 then
            moveLeft(betrag(count))
            return true
        elseif count < 0 then
            moveRight(betrag(count))
            return true
        end
    elseif axis == 1 then
        if count > 0 then
            moveBack(betrag(count))
            return true
        elseif count < 0 then
            moveForward(betrag(count))
            return true
        end
    end

end

function moveRight(ci)
    turtle.turnRight(1)
        for i=1, ci do
            print("Moving right. New: "..(posx+1).." / "..posy)
            if not turtle.detect() then
                turtle.forward()
                iposx()
            else print("I crashed right!")
            end
        end
    turtle.turnLeft(1)
end

function moveLeft(ci)
    turtle.turnLeft(1)
        for i=1, ci do
            print("Moving left. New: "..(posx-1).." / "..posy)
            if not turtle.detect() then
                turtle.forward()
                dposx()
            else print("I crashed left!")
            end
        end
    turtle.turnRight(1)
end

function moveForward(ci)
    for i=1, ci do
        print("Moving forward. New: "..posx.." / "..(posy+1))
        if not turtle.detect() then
            turtle.forward()
            iposy()
        else print("I crashed forward!")
        end
    end
end

function moveBack(ci)
    turn180()
    for i=1, ci do
        print("Moving back. New: "..posx.." / "..(posy-1))
        if not turtle.detect() then
            turtle.forward()
            dposy()
        else print("I crashed backward!")
        end
    end
    turn180()
end

function turn180()
turtle.turnRight()
turtle.turnRight()
end


if not waitafter then sleep(wait) end
--.....
move(1,1)
move(1,1)
if waitafter then sleep(wait) end