Did i ruin my diet or will i gain ?

The nuts, nor the mccy D's "ruined" your diet. Yes, you ate some extra unneeded calories.. but what's done is done. You are getting plenty of workout so extra HEALTHY calories are fine. The Mccy D's is worse than the nuts because of that. Make sure to spread calories out over the day... not just in lump sums... and see your doctor if you believe your are a binger