I made a big mistake

I own a royal enfield bullet 350. Recently I went away for a while so I unplugged my battery and put it on a charger. After returning out of excitement to ride again I connected the battery without checking the terminals and put the negative lead on the positive terminal and the positive lead on the negative terminal when I went to plug in the positive terminal connector there was a big spark and something started making a buzzing noise. After realizing my mistake I switched the leads to the correct position. Now there is no power to the electronics. The bike does not start. Did I just fry my ecu? I feel so stupid for making this mistake.