#!/usr/bin/env python3
import json, os
from datetime import datetime, timezone
from pathlib import Path
from common import request,store,state_file

ROOT=Path(__file__).resolve().parents[1]
URL='https://errata.almalinux.org/{major}/errata.full.json'

def check(payload):
    # Source can be a JSON object or an array; reject HTML/errors.
    value=json.loads(payload)
    if not isinstance(value,(dict,list)) or not value:
        raise ValueError('Unexpected empty AlmaLinux errata response')
    return value

def main():
    for major in (8,9,10):
        dest=ROOT/f'data/almalinux/{major}/errata.full.json'
        state=ROOT/f'state/{major}.json'
        meta=json.loads(state.read_text()) if state.exists() else {}
        headers={}
        if dest.exists():
            if meta.get('etag'): headers['If-None-Match']=meta['etag']
            if meta.get('last_modified'): headers['If-Modified-Since']=meta['last_modified']
        status,raw,h=request(URL.format(major=major),headers)
        if status==304:
            print(f'AlmaLinux {major}: unchanged (HTTP 304)'); continue
        check(raw)
        changed=store(dest,raw)
        state_file(state,{
            'source':URL.format(major=major),
            'etag':h.get('ETag',meta.get('etag','')),
            'last_modified':h.get('Last-Modified',meta.get('last_modified','')),
            'last_success_utc':datetime.now(timezone.utc).isoformat(),
            'sha256':__import__('hashlib').sha256(raw).hexdigest(),
        })
        print(f'AlmaLinux {major}: {len(raw)} bytes, changed={changed}')

if __name__=='__main__': main()