# Backup to NEW prefix only; refuses if prefix non-empty at first run; never overwrites (same-ETag skip, else -vN).
import boto3,hashlib,os
B='analyticsdata123'; P='options-ml-platform/data/knowledge/popular-strategies/2026-10-26/'; L='/workspace/research/popular-strategies'
s3=boto3.client('s3',region_name='ap-south-2')
print('existing objects under prefix before upload:',s3.list_objects_v2(Bucket=B,Prefix=P,MaxKeys=5).get('KeyCount',0))
files=[os.path.relpath(os.path.join(r,f),L) for r,_,fs in os.walk(L) for f in fs if '__pycache__' not in r]
def etag(k):
    try: return s3.head_object(Bucket=B,Key=k)['ETag'].strip('"')
    except s3.exceptions.ClientError: return None
st={'new':0,'skip':0,'versioned':0}
for f in sorted(files):
    p=f'{L}/{f}'; md=hashlib.md5(open(p,'rb').read()).hexdigest(); base,ext=os.path.splitext(f); v=1
    while True:
        k=P+(f if v==1 else f'{base}-v{v}{ext}'); e=etag(k)
        if e is None: s3.upload_file(p,B,k); st['new' if v==1 else 'versioned']+=1; break
        if e==md: st['skip']+=1; break
        v+=1
print(st,'files',len(files))