-- argument
local tArgs = { ... }
if #tArgs ~= 1 then
	print( "Usage: farmtree <lenght>" )
	return
end

-- var
length = tonumber( tArgs[1] );

-- test
-- enough fuel
if turtle.getFuelLevel() < length * 9 + length then
    turtle.select(16);
    if turtle.detectUp() and turtle.suckUp() then
        turtle.refuel(turtle.getItemCount(16));
        if turtle.getFuelLevel() < length * 9 + length then
            print("not enough fuel for worst case scenario");
            return;
        end;
   else
        print("not enough fuel for worst case scenario");
        return;
   end;
end;
-- enough sapling + 1
turtle.select(1);
print("first block must contain enough sapling");
if turtle.getItemCount(1) < length+1 then
    print("not enough sapling");
    return;
end;

-- main program
-- keep one space between
turtle.forward();
-- dig all tree in passage
for i=1,length do
    os.run({},"/rom/programs/turtle/lumber");
end;
-- plant all sapling
turtle.up();
turtle.turnLeft();
turtle.turnLeft();
for i=1,length do
    turtle.placeDown();
    turtle.forward();
end;
turtle.down();
-- keep one space
turtle.forward();
-- drop all in chest
for i=2,16 do
    turtle.select(i);
    turtle.drop();
end;
turtle.turnLeft();
turtle.turnLeft();

print("have a nice day");