"""
Vendor record extraction from captured CMP payloads.

Mirrors the per-CMP `extract_vendors()` functions in consent-tester's
cmp_library/ — duplicated here because the backend cannot import the
consent-tester package (different containers). Schemas are stable per CMP
vendor, so this is acceptable. When a new CMP is added in consent-tester,
add the matching extractor here.

Returned vendor record schema:
    {
      "name": str,                   # e.g. "Adobe Systems Software Ireland Limited"
      "country": str,                # ISO 2-letter (DE/US/...) when known
      "purpose": str,                # short description of what they do
      "category": str,               # marketing/analytics/functional/necessary
      "opt_out_url": str,            # link to opt out (Art. 7(3) DSGVO)
      "privacy_policy_url": str,     # link to vendor's privacy policy
      "persistence": str,            # human-readable retention text
      "cookies": [                   # cookies this vendor sets
        {"name": str, "purpose": str, "expiry": str, "is_third_party": bool}
      ],
      # Compliance scoring (filled after vendor_compliance.evaluate())
      "compliance_score": int,       # 0-100
      "compliance_flags": list[str], # e.g. ["no_opt_out", "broken_opt_out"]
    }
"""

from __future__ import annotations

import logging
import re

logger = logging.getLogger(__name__)

_TAG_RE = re.compile(r"<[^>]+>")
_WS_RE = re.compile(r"\s+")


def _clean(s: object) -> str:
    text = "" if s is None else str(s)
    no_tags = _TAG_RE.sub(" ", text)
    return _WS_RE.sub(" ", no_tags).strip()


def extract_vendors_from_payloads(payloads: list[dict]) -> list[dict]:
    """Walk every captured CMP payload, dispatch to per-CMP extractor.

    Deduplicates vendors across payloads by name (preserves richer record).
    """
    all_vendors: dict[str, dict] = {}
    for payload in payloads or []:
        kind = payload.get("kind", "")
        data = payload.get("data", {})
        if not isinstance(data, dict):
            continue
        try:
            if kind == "epaas":
                vendors = _extract_epaas(data)
            elif kind == "onetrust":
                vendors = _extract_onetrust(data)
            else:
                # Generic fallback: walk data for vendor-like dicts
                vendors = _extract_generic(data)
        except Exception as e:
            logger.warning("vendor extractor failed for %s: %s", kind, e)
            continue
        for v in vendors:
            name = (v.get("name") or "").strip()
            if not name:
                continue
            existing = all_vendors.get(name)
            if existing:
                # Merge cookies + fill empty fields
                for k, v_val in v.items():
                    if not existing.get(k) and v_val:
                        existing[k] = v_val
                existing.setdefault("cookies", []).extend(v.get("cookies", []))
            else:
                all_vendors[name] = v
    return list(all_vendors.values())


# ── ePaaS (BMW Group) ───────────────────────────────────────────────

def _extract_epaas(d: dict) -> list[dict]:
    out: list[dict] = []
    providers = d.get("providers", []) or []
    cookies_by_provider: dict[str, list[dict]] = {}

    for c in d.get("cookies", []) or []:
        pid = str(c.get("providerId") or c.get("provider") or c.get("vendor") or "")
        if pid:
            cookies_by_provider.setdefault(pid, []).append({
                "name": c.get("name") or c.get("id") or "",
                "purpose": _clean(c.get("purpose") or c.get("description")),
                "expiry": _clean(c.get("expiry") or c.get("retention") or c.get("persistence")),
                "is_third_party": bool(c.get("isThirdParty") or c.get("third_party")),
            })

    for p in providers:
        pid = str(p.get("id") or p.get("vendorId") or p.get("name") or "")
        cookies = cookies_by_provider.get(pid, []) or [{
            "name": c.get("name", ""),
            "purpose": _clean(c.get("purpose")),
            "expiry": _clean(c.get("expiry") or c.get("persistence")),
            "is_third_party": True,
        } for c in (p.get("cookies", []) or [])]
        out.append({
            "name": p.get("name") or pid or "",
            "country": (p.get("country") or "").strip(),
            "purpose": _clean(p.get("purpose")),
            "category": (p.get("category") or "").strip(),
            "opt_out_url": (p.get("optOutUrl") or p.get("optoutUrl")
                            or p.get("opt_out_url") or "").strip(),
            "privacy_policy_url": (p.get("policyUrl") or p.get("policy_url")
                                   or p.get("privacyPolicyUrl") or "").strip(),
            "persistence": _clean(p.get("persistencePurposeDescription")),
            "cookies": cookies,
        })
    return out


# ── OneTrust ────────────────────────────────────────────────────────

def _extract_onetrust(d: dict) -> list[dict]:
    out_by_name: dict[str, dict] = {}
    for g in d.get("Groups") or d.get("groups") or []:
        category = g.get("GroupName") or g.get("name") or ""
        for c in g.get("Cookies") or g.get("cookies") or []:
            provider = (c.get("Provider") or c.get("provider")
                        or c.get("Host") or c.get("host") or "").strip()
            if not provider:
                continue
            cookie_entry = {
                "name": c.get("Name") or c.get("name") or "",
                "purpose": _clean(c.get("description") or c.get("Description")),
                "expiry": _clean(c.get("Length") or c.get("expires")),
                "is_third_party": bool(c.get("IsThirdParty") or c.get("isThirdParty")),
            }
            if provider in out_by_name:
                out_by_name[provider]["cookies"].append(cookie_entry)
            else:
                out_by_name[provider] = {
                    "name": provider,
                    "country": "",
                    "purpose": _clean(g.get("GroupDescription") or c.get("description")),
                    "category": category,
                    "opt_out_url": "",
                    "privacy_policy_url": (c.get("PolicyUrl") or c.get("policyUrl") or ""),
                    "persistence": "",
                    "cookies": [cookie_entry],
                }
    return list(out_by_name.values())


# ── Generic fallback (other CMPs / heuristic captures) ──────────────

def _extract_generic(d: dict) -> list[dict]:
    """Best-effort walk for unknown CMP shapes.

    Looks for top-level keys named 'vendors' / 'providers' / 'services' and
    extracts name/purpose/country fields from each entry.
    """
    out: list[dict] = []
    for key in ("vendors", "providers", "services", "dataProcessingServices",
                "Vendors", "Providers"):
        lst = d.get(key)
        if not isinstance(lst, list):
            continue
        for entry in lst:
            if not isinstance(entry, dict):
                continue
            name = (entry.get("name") or entry.get("vendor")
                    or entry.get("dataProcessor") or "").strip()
            if not name:
                continue
            out.append({
                "name": name,
                "country": (entry.get("country") or "").strip(),
                "purpose": _clean(entry.get("purpose") or entry.get("description")
                                  or entry.get("dataPurpose")),
                "category": (entry.get("category") or "").strip(),
                "opt_out_url": (entry.get("optOutUrl") or entry.get("opt_out_url")
                                or "").strip(),
                "privacy_policy_url": (entry.get("policyUrl") or entry.get("privacyPolicyUrl")
                                       or entry.get("privacy_policy_url") or "").strip(),
                "persistence": _clean(entry.get("retentionPeriodDescription")),
                "cookies": [],
            })
    return out