"""쿠팡 검색 어댑터.

쿠팡은 Akamai Bot Manager 의 JS 행동 챌린지를 걸어 curl_cffi 단독으로는 통과 못 한다.
→ Patchright(스텔스 Playwright) + 실제 Chrome 으로 챌린지를 통과한다.
persistent context 로 브라우저를 재사용하므로 챌린지는 (쿠키 만료 전까지) 1회만 풀린다.

향후 최적화(하이브리드): 검증된 Akamai 쿠키를 curl_cffi 로 넘겨 대량 후속 요청을
브라우저 없이 처리 가능. 현재는 브라우저 재사용만으로도 후속 검색이 충분히 빠르다.
"""

import asyncio
from urllib.parse import quote

from patchright.async_api import async_playwright

from common.logger import LOG
from services.search.contract import SearchAdapter, NormalizedProduct, AdapterError, AdapterHealth
from services.search.rate_limiter import RateLimiter
from services.search.coupang.parser import parse_search_html
from services.search.coupang.selectors import SELECTORS

_SEARCH_URL = "https://www.coupang.com/np/search?q={q}&channel=user&listSize={n}"
_BLOCK_MARKERS = ("sec-if-cpt-container", "Powered and protected", "/akam/")


class CoupangAdapter(SearchAdapter):
    source = "coupang"

    def __init__(self, headless: bool = False, user_data_dir: str = "/tmp/lps_coupang_profile", rate_limiter: RateLimiter | None = None):
        self._headless = headless
        self._user_data_dir = user_data_dir
        self._rl = rate_limiter or RateLimiter()
        self._pw = None
        self._ctx = None
        self._lock = asyncio.Lock()
        self._ok = 0
        self._blocked = 0

    async def _ensure_browser(self):
        if self._ctx is not None:
            return
        self._pw = await async_playwright().start()
        self._ctx = await self._pw.chromium.launch_persistent_context(
            user_data_dir=self._user_data_dir,
            channel="chrome",
            headless=self._headless,
            no_viewport=True,
        )

    async def search(self, query: str, limit: int = 40) -> list[NormalizedProduct]:
        async with self._lock:  # 인스턴스 내 검색은 직렬화(브라우저 컨텍스트 공유)
            await self._rl.wait()
            await self._ensure_browser()
            page = self._ctx.pages[0] if self._ctx.pages else await self._ctx.new_page()
            url = _SEARCH_URL.format(q=quote(query), n=limit)
            try:
                await page.goto(url, wait_until="domcontentloaded", timeout=40000)
                # Akamai 센서 실행 + 상품 렌더 대기
                try:
                    await page.wait_for_selector(SELECTORS.card, timeout=20000)
                except Exception:
                    pass
                html = await page.content()
            except Exception as ex:
                raise AdapterError(f"쿠팡 검색 실패: {ex}", source=self.source) from ex

            products = parse_search_html(html, source=self.source)
            if not products:
                blocked = any(m in html for m in _BLOCK_MARKERS)
                self._blocked += 1
                LOG.w(f"[coupang] 결과 0건 (blocked={blocked}) query={query!r} len={len(html)}")
                raise AdapterError(f"쿠팡 결과 없음/차단 (query={query!r})", source=self.source, blocked=blocked)

            self._ok += 1
            LOG.d(f"[coupang] query={query!r} → {len(products)}건 (limit {limit})")
            return products[:limit]

    async def health(self) -> AdapterHealth:
        total = self._ok + self._blocked
        rate = (self._ok / total) if total else 0.0
        return AdapterHealth(
            source=self.source,
            ok=self._blocked == 0 or rate > 0.5,
            recent_success_rate=rate,
            blocked_rate=(self._blocked / total) if total else 0.0,
        )

    async def close(self):
        if self._ctx is not None:
            await self._ctx.close()
            self._ctx = None
        if self._pw is not None:
            await self._pw.stop()
            self._pw = None