89 240sx FB Wont start, Blinking interior, Clicking sound

[shortstackk]

I bout a 89 240 about a month ago and have been driving it since, Ive done seafoam, changed oil, spark plugs, errythang like that and it drove amazing until last night,

I parked it at a friends house and came out 2 hours later and it wouldnt start. I can pull my key out while car is on and i think i turned the car off and somehow it stayed on "on" or it moved.. This morning i try to start it and i heard a clicking noise idk from where, and when i open my door my interior lights blink when i put the key to "start" everything dies (interior lights, dash/clock), Help?!

When i bought the car it already had a wired push start (proabaly cause the starter was dead) but he lived in the city so he said "so people cant steal it", I have googled like a mofo and cant figure what it is. Battery reads 12.4v, let me know if anyone has suggestions.