"""Sub-Issue A — Live Adapter Tests gegen die echten Landtag-Backends.

Pro aktivem Bundesland aus ``aktive_bundeslaender()`` werden die folgenden
Eigenschaften geprüft:

1. Reachability — ``adapter.search("", limit=5)`` läuft erfolgreich durch
2. Result-Anzahl > 0 (0 Treffer ist Indikator für Schema-Drift)
3. Drucksachen-ID-Format ``\\d+/\\d+``
4. Type-Filter — kein Result hat einen ``typ``, der eindeutig kein Antrag
   ist (Substring-Match auf "Antrag" weil TH "Antrag gemäß § 79 GO" nutzt)
5. Datum-Plausibilität — wenn gesetzt, dann zwischen ``wahlperiode_start``
   und heute
6. Fraktionen-Plausibilität — falls gesetzt, müssen sie in
   ``landtagsfraktionen ∪ {"Landesregierung", "BSW", "FREIE WÄHLER", "SSW"}``
   liegen
7. PDF-Link erreichbar (markiert als ``slow``)

Bug-Klassen aus den letzten Sessions, die diese Datei abdeckt:
- 2 (LSA WEV01-vs-WEV06 Format-Drift)
- 6 (TH composite type "Antrag gemäß § 79 GO")
- 7 (HE Card-Layout — sobald HE wieder im aktiven Set ist)
- 8 (NI Login-Page → xfail)
- 13 (Datum leer trotz BE-Format mit "vom")
- 16 (Pagination liefert 0 Anträge)
- 18 (PDF-Download-Link kaputt)

Issue: #51 (Sub-Issue A des Umbrella #50)
"""
import re
from datetime import date

import httpx
import pytest

from app.bundeslaender import BUNDESLAENDER, aktive_bundeslaender
from app.parlamente import ADAPTERS, Drucksache


pytestmark = pytest.mark.integration


# ─────────────────────────────────────────────────────────────────────────────
# Setup
# ─────────────────────────────────────────────────────────────────────────────

# All currently active state codes, parametrised so each BL appears as its
# own test entry in the pytest output. NI is xfailed because nilas/portal
# is login-protected (see issue #22 for the deferred state).
_ACTIVE_CODES = [bl.code for bl in aktive_bundeslaender()]

_BL_PARAMS = [
    pytest.param(
        code,
        marks=pytest.mark.xfail(
            reason="nilas.niedersachsen.de/portal/ ist Login-protected, deferred (Issue #22)",
            strict=False,
        ),
    )
    if code == "NI"
    else code
    for code in _ACTIVE_CODES
]


# Whitelist of acceptable hit-typ values. Strict-Match would fail TH because
# its types look like "Antrag gemäß § 79 GO". Substring "Antrag" is the
# pragmatic invariant. The blacklist below is the explicit anti-marker.
_ACCEPTABLE_TYP_SUBSTRING = "antrag"

# Hits with these typ-substrings are clearly NOT Anträge — if any of these
# appears in the result list the type-filter has drifted.
_FORBIDDEN_TYP_SUBSTRINGS = (
    "kleine anfrage",
    "große anfrage",
    "grosse anfrage",
    "plenarprotokoll",
    "sitzung",
    "ausschussvorlage",
    "beschlussempfehlung",
    "gesetz- und verordnungsblatt",
    "tagesordnung",
)

# Wahltermin-Insensitive Whitelist of fraction codes that may appear in
# any active Bundesland's hit list, on top of the BL-specific
# landtagsfraktionen.
_UNIVERSAL_FRAKTIONEN = {
    "Landesregierung",  # synthetic from _normalize_fraktion
}


# ─────────────────────────────────────────────────────────────────────────────
# 1. Reachability + 2. Result-Anzahl
# ─────────────────────────────────────────────────────────────────────────────


@pytest.mark.parametrize("code", _BL_PARAMS, ids=lambda c: c)
async def test_adapter_search_reachable(code: str):
    """The adapter must answer ``search('', limit=5)`` with at least 1 hit
    without raising or returning empty.

    A 0-hit response is the strongest indicator of schema-drift, e.g. when
    a Landtag changes their backend HTML structure or moves their endpoint.
    """
    adapter = ADAPTERS[code]
    results = await adapter.search("", limit=5)
    assert isinstance(results, list)
    assert len(results) > 0, (
        f"{code} adapter ({type(adapter).__name__}) returned 0 hits for "
        "an unfiltered browse — likely schema-drift in the live backend"
    )


# ─────────────────────────────────────────────────────────────────────────────
# 3. Drucksachen-ID-Format
# ─────────────────────────────────────────────────────────────────────────────

_RE_DRUCKSACHE_ID = re.compile(r"^\d+/\d+(?:\(neu\))?$")


@pytest.mark.parametrize("code", _BL_PARAMS, ids=lambda c: c)
async def test_drucksache_id_format(code: str):
    """Every result must have a Drucksache-Nummer in the canonical
    ``<wp>/<num>`` form (e.g. ``8/6390``). Some adapters annotate
    re-issued documents with ``(neu)`` — that's allowed too."""
    adapter = ADAPTERS[code]
    results = await adapter.search("", limit=10)
    invalid = [r.drucksache for r in results if not _RE_DRUCKSACHE_ID.match(r.drucksache)]
    assert not invalid, (
        f"{code}: Drucksachen-IDs verletzen das ``<wp>/<num>``-Format: {invalid}"
    )


# ─────────────────────────────────────────────────────────────────────────────
# 4. Type-Filter-Wirksamkeit
# ─────────────────────────────────────────────────────────────────────────────


@pytest.mark.parametrize("code", _BL_PARAMS, ids=lambda c: c)
async def test_type_filter_returns_only_antraege(code: str):
    """No hit may have a ``typ`` that's clearly NOT an Antrag.

    The whitelist is permissive (substring "antrag", to allow TH-style
    "Antrag gemäß § 79 GO"). The blacklist below is the explicit
    anti-marker — if any forbidden substring appears, the type filter
    has drifted.
    """
    adapter = ADAPTERS[code]
    results = await adapter.search("", limit=10)
    bad: list[tuple[str, str]] = []
    for r in results:
        typ_lower = (r.typ or "").lower()
        for forbidden in _FORBIDDEN_TYP_SUBSTRINGS:
            if forbidden in typ_lower:
                bad.append((r.drucksache, r.typ))
                break
    assert not bad, (
        f"{code}: hit list contains non-Antrag entries: {bad}"
    )


# ─────────────────────────────────────────────────────────────────────────────
# 5. Datum-Plausibilität
# ─────────────────────────────────────────────────────────────────────────────


@pytest.mark.parametrize("code", _BL_PARAMS, ids=lambda c: c)
async def test_datum_within_wahlperiode_window(code: str):
    """If a hit has a ``datum``, it must lie between ``wahlperiode_start``
    and today. Hits with empty ``datum`` are not asserted (some adapters
    legitimately can't always extract one)."""
    adapter = ADAPTERS[code]
    bl = BUNDESLAENDER[code]
    wp_start = bl.wahlperiode_start
    today_iso = date.today().isoformat()

    results = await adapter.search("", limit=10)
    bad: list[str] = []
    for r in results:
        if not r.datum:
            continue
        if not (wp_start <= r.datum <= today_iso):
            bad.append(f"{r.drucksache} datum={r.datum} not in [{wp_start}..{today_iso}]")
    assert not bad, (
        f"{code}: implausible Drucksachen-Datümer: " + "; ".join(bad)
    )


# ─────────────────────────────────────────────────────────────────────────────
# 6. Fraktionen-Plausibilität
# ─────────────────────────────────────────────────────────────────────────────


@pytest.mark.parametrize("code", _BL_PARAMS, ids=lambda c: c)
async def test_fraktionen_in_landtag(code: str):
    """If a hit has Fraktionen, every entry must be either a known
    Landtagsfraktion or one of the universal extras (Landesregierung)."""
    adapter = ADAPTERS[code]
    bl = BUNDESLAENDER[code]
    allowed = set(bl.landtagsfraktionen) | _UNIVERSAL_FRAKTIONEN

    results = await adapter.search("", limit=10)
    bad: list[tuple[str, list[str]]] = []
    for r in results:
        if not r.fraktionen:
            continue
        unknown = [f for f in r.fraktionen if f not in allowed]
        if unknown:
            bad.append((r.drucksache, unknown))
    assert not bad, (
        f"{code}: unknown Fraktionen in hit list (allowed={sorted(allowed)}): {bad}"
    )


# ─────────────────────────────────────────────────────────────────────────────
# 7. PDF-Link erreichbar (slow)
# ─────────────────────────────────────────────────────────────────────────────


@pytest.mark.slow
@pytest.mark.parametrize("code", _BL_PARAMS, ids=lambda c: c)
async def test_first_result_pdf_link_reachable(code: str):
    """HEAD-probe against the first hit's PDF link. Server must answer
    200, 301, 302 or 303 (redirects to a real file)."""
    adapter = ADAPTERS[code]
    results = await adapter.search("", limit=1)
    assert len(results) > 0, f"{code}: no hit to probe"

    link = results[0].link
    assert link, f"{code}: first hit has no link"

    async with httpx.AsyncClient(
        timeout=30,
        follow_redirects=False,
        headers={"User-Agent": "Mozilla/5.0 GWOE-Antragspruefer-Test"},
    ) as client:
        resp = await client.head(link)
    assert resp.status_code in (200, 301, 302, 303), (
        f"{code}: PDF link HEAD returned {resp.status_code}: {link}"
    )