"""Auto-Learning für Cookies: nach jedem Audit alle deklarierten +
beobachteten Cookies in compliance.cookie_behavior_audits loggen.

Cross-Site-Konsens (≥3 Sites mit ähnlichem declared_purpose) macht
einen unbekannten Cookie zum Promotion-Kandidaten für die kuratierte
BreakPilot-KB. Diese Logik lebt im `cookie_library_lookup._load_auto_learning`.

Best-Effort: jeder DB-Fehler wird geloggt aber nicht propagiert —
ein Logging-Fail soll keinen Audit abbrechen.
"""

from __future__ import annotations

import logging
from urllib.parse import urlparse

logger = logging.getLogger(__name__)


def _site_url_from_state(state: dict) -> str:
    req = state.get("req")
    if req is None:
        return ""
    for d in getattr(req, "documents", []) or []:
        url = getattr(d, "url", "") or ""
        if url and "://" in url:
            p = urlparse(url)
            return f"{p.scheme}://{p.netloc}"
    return ""


def log_observations(state: dict) -> dict:
    """Persist every (cookie, site, declared) tuple into
    cookie_behavior_audits. Returns stats dict for logging."""
    try:
        from database import SessionLocal
        from sqlalchemy import text
    except Exception:
        return {"logged": 0, "skipped": "no_db"}

    check_id = state.get("check_id") or ""
    site_url = _site_url_from_state(state)
    if not site_url:
        return {"logged": 0, "skipped": "no_site_url"}

    cmp_vendors = state.get("cmp_vendors") or []
    if not cmp_vendors:
        return {"logged": 0, "skipped": "no_cmp_vendors"}

    db = SessionLocal()
    inserted = 0
    skipped = 0
    try:
        for v in cmp_vendors:
            vendor_name = (v.get("name") or "").strip()
            for c in (v.get("cookies") or []):
                cname = (c.get("name") or "").strip()
                if not cname:
                    skipped += 1
                    continue
                declared_cat = (c.get("category")
                                or v.get("category") or "").strip()[:50]
                try:
                    db.execute(
                        text(
                            "INSERT INTO compliance.cookie_behavior_audits "
                            "(check_id, site_url, cookie_name, "
                            "cookie_domain, declared_category, "
                            "observed_max_age_seconds) "
                            "VALUES (:cid, :site, :name, :dom, :cat, :age)"
                        ),
                        {
                            "cid": check_id,
                            "site": site_url,
                            "name": cname,
                            "dom": (v.get("domain")
                                    or v.get("name") or "")[:200],
                            "cat": declared_cat,
                            "age": None,
                        },
                    )
                    inserted += 1
                except Exception as e:
                    logger.info("cookie_observations insert skipped %s: %s",
                                 cname, str(e)[:120])
                    skipped += 1
        db.commit()
    except Exception as e:
        logger.warning("cookie_observations commit failed: %s", e)
    finally:
        db.close()
    return {"logged": inserted, "skipped": skipped, "site_url": site_url}