"""Deep-crawl pełnych katalogów browse-tube'ów (Faza 2a — "ingest-all").

Browse scrapery (ALL_BROWSE_SCRAPERS) mają pełne listingi (np. porndoe >62k scen),
a my mieliśmy ~3% katalogu (search-by-performer + top-N browse). Ten job paginuje
DEEP: per tube trzyma kursor `last_page`, co run crawluje kolejne N stron od kursora,
idempotentnie (resolver pomija znane po raw_hash). Po dojściu do końca katalogu
(pusty listing) tube jest `exhausted`; gdy wszystkie exhausted — reset kursorów i
re-sweep od page 1 (incremental: łapie nowe + potwierdza istniejące).

Pilot 2026-06-03 (porndoe ogon, strony 64-110): 1119 nowych scen, 100% grywalne +
100% otagowane, 0% canonical-overlap (czysto addytywny content, nie duplikuje TPDB/
StashDB). ~1.2s/scenę.

Stan w JSON (mounted `app/_state/deepcrawl_state.json`) — wznawia między runami bez
migracji DB. Round-robin po `updated_at` → wszystkie tube'y postępują równomiernie.
"""
from __future__ import annotations

import json
import logging
import time
from pathlib import Path

from app.config import get_settings
from app.connectors.direct_scrapers import ALL_BROWSE_SCRAPERS
from app.db import session_scope
from app.extractors import browser_get
from app.ingest import _process_scene, get_or_create_source
from app.models.source import SourceKind

log = logging.getLogger(__name__)

_DEFAULT_STATE = Path(__file__).resolve().parent.parent / "_state" / "deepcrawl_state.json"


def _state_path() -> Path:
    return Path(getattr(get_settings(), "deepcrawl_state_path", None) or _DEFAULT_STATE)


def _load_state() -> dict:
    p = _state_path()
    if p.exists():
        try:
            return json.loads(p.read_text(encoding="utf-8"))
        except Exception as e:  # pragma: no cover - obronnie
            log.warning("deep-crawl: bad state file %s: %s — starting fresh", p, e)
    return {}


def _save_state(state: dict) -> None:
    p = _state_path()
    p.parent.mkdir(parents=True, exist_ok=True)
    tmp = p.with_suffix(".tmp")
    tmp.write_text(json.dumps(state, indent=2), encoding="utf-8")
    tmp.replace(p)  # atomic


def _browse_scrapers() -> dict:
    """{sitetag: scraper_cls} dla zarejestrowanych browse-scraperów."""
    out: dict = {}
    for cls in ALL_BROWSE_SCRAPERS:
        try:
            out[cls().sitetag] = cls
        except Exception as e:  # pragma: no cover
            log.warning("deep-crawl: skip scraper %s: %s", cls.__name__, e)
    return out


def _pick_target(state: dict, targets: list[str]) -> str | None:
    """Wybierz tube do crawla: najmniej-ostatnio-crawlowany, pomijając exhausted.
    Gdy wszystkie exhausted → reset (incremental re-sweep od page 1)."""
    live = [t for t in targets if not state.get(t, {}).get("exhausted")]
    if not live:
        if not targets:
            return None
        log.info("deep-crawl: all tubes exhausted → reset cursors for incremental re-sweep")
        for t in targets:
            state.setdefault(t, {})
            state[t]["exhausted"] = False
            state[t]["last_page"] = 0
        live = targets
    live.sort(key=lambda t: state.get(t, {}).get("updated_at", 0))
    return live[0]


def run_deep_crawl(*, pages_per_run: int = 60, sitetags: list[str] | None = None) -> dict:
    """Jeden run: wybierz tube, crawl kolejne `pages_per_run` stron od kursora, ingest.
    Zwraca podsumowanie (sitetag, zakres stron, counters, exhausted)."""
    scrapers = _browse_scrapers()
    targets = [t for t in (sitetags or list(scrapers)) if t in scrapers]
    if not targets:
        log.warning("deep-crawl: no browse scrapers / matching sitetags")
        return {}

    state = _load_state()
    sitetag = _pick_target(state, targets)
    if sitetag is None:
        return {}

    scraper = scrapers[sitetag]()
    start = int(state.get(sitetag, {}).get("last_page", 0)) + 1
    end = start + pages_per_run - 1

    with session_scope() as session:
        src = get_or_create_source(session, kind=SourceKind.scraper, name="pornapp")
        source_id = src.id

    counters = {"seen": 0, "new": 0, "updated": 0, "skipped": 0, "errors": 0}
    t0 = time.time()
    last_done = start - 1
    exhausted = False

    for page in range(start, end + 1):
        try:
            res = browser_get(scraper._listing_url(page), timeout=30)
            html = res.text if hasattr(res, "text") else res
        except Exception as e:
            log.warning("deep-crawl %s listing page %d failed: %s", sitetag, page, e)
            break  # nie awansuj kursora przez błąd sieci — następny run powtórzy
        urls = scraper._extract_scene_urls(html)
        if not urls:
            log.info("deep-crawl %s: empty page %d → catalog end (exhausted)", sitetag, page)
            exhausted = True
            last_done = page
            break
        for u in urls:
            try:
                r = browser_get(u, timeout=30)
                dh = r.text if hasattr(r, "text") else r
                raw = scraper._parse_detail(u, dh)
            except Exception:
                counters["errors"] += 1
                continue
            if raw is None:
                continue
            counters["seen"] += 1
            try:
                _process_scene(source_id=source_id, raw_scene=raw, counters=counters)
            except Exception:
                counters["errors"] += 1
        last_done = page

    st = state.setdefault(sitetag, {})
    st["last_page"] = last_done
    st["exhausted"] = exhausted
    st["updated_at"] = int(time.time())
    _save_state(state)

    log.info(
        "deep-crawl %s pages %d-%d: %s exhausted=%s (%.0fs)",
        sitetag, start, last_done, counters, exhausted, time.time() - t0,
    )
    return {"sitetag": sitetag, "start": start, "end": last_done, "exhausted": exhausted, **counters}