My first cat ever, Mr. Amber Cat, was like this. I was living in an apartment, fed him, got to pick him up, and finally just brought him in.
When you bring him in, be sure you have a sweatshirt on, and use a blanket. Be prepared for him to freak out being inside. If he has been a pet in the past, he will calm down in less than 10 minutes. Otherwise you may need to keep him in a kennel for a time to let him acclimate. Amber calmed down in that 10 minutes time frame. As soon as you can, get him in to a vet for an evaluation; have him tested for FIV and FeLV, and arranged for neutering.
Mr. Amber Cat learned to walk on a harness and leash. This was our compromise; because he wanted to go out and I insisted he be an indoor only kitty. So after about 6 months, and a week or so of getting him used to the harness, we went out and walked around the building. TWICE. And that was it, we had a routine. Heat, Cold, rain, snow, ice, he didn't care, he INSISTED on having his walk once daily. And we had to go around the building twice. Not once; not 3 times. TWICE.
He was a loving boy, snuggle with me at night in bed, and eventually he also enjoyed sitting out on the balcony (I was in a 3rd floor walk up, he never bothered to jump down. BUT only started him out there well after a year inside). As long as we walked around the building TWICE, daily. For 9.5 YEARS. Well worth it, IMO!
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