import os
import re
from urllib.parse import urlsplit, urlunsplit

from playwright.sync_api import TimeoutError as PlaywrightTimeoutError
from playwright.sync_api import sync_playwright


ALLOWED_HOSTS = {
    "maps.app.goo.gl", "goo.gl", "google.com", "www.google.com",
    "maps.google.com", "google.pl", "www.google.pl", "maps.google.pl",
}
MAX_URL_LENGTH = 1200


class ScrapeError(RuntimeError):
    pass


def validate_maps_url(raw_url: str) -> str:
    """Przepuszcza wyłącznie zwykłe linki HTTPS do Google Maps."""
    url = raw_url.strip()
    if not url:
        raise ValueError("Wklej link do miejsca w Google Maps.")
    if len(url) > MAX_URL_LENGTH or any(ord(char) < 32 for char in url):
        raise ValueError("Link jest nieprawidłowy albo zbyt długi.")
    try:
        parsed = urlsplit(url)
        host = (parsed.hostname or "").lower().rstrip(".")
        port = parsed.port
    except ValueError:
        raise ValueError("Link ma nieprawidłowy format.") from None
    if parsed.scheme.lower() != "https" or not host or parsed.username or parsed.password:
        raise ValueError("Dozwolony jest wyłącznie bezpieczny link HTTPS do Google Maps.")
    if port not in (None, 443) or host not in ALLOWED_HOSTS:
        raise ValueError("To nie jest obsługiwany link Google Maps.")

    path = parsed.path or "/"
    if host == "maps.app.goo.gl":
        valid_path = re.fullmatch(r"/[A-Za-z0-9_-]{5,100}/?", path)
    elif host == "goo.gl":
        valid_path = re.fullmatch(r"/maps/[A-Za-z0-9_-]{5,100}/?", path)
    else:
        valid_path = path == "/maps" or path.startswith("/maps/")
    if not valid_path:
        raise ValueError("Link musi prowadzić do miejsca w Google Maps.")
    return urlunsplit(("https", host, path, parsed.query, ""))


def _number(text: str) -> int | None:
    compact = re.sub(r"[\s\u00a0\u202f.,]", "", text)
    return int(compact) if compact.isdigit() else None


def parse_distribution_labels(labels: list[str]) -> dict[int, int]:
    """Czyta np. '5 gwiazdek, 123 opinie' — nie mierzy szerokości paska."""
    result = {}
    for label in labels:
        clean = " ".join(label.lower().split())
        if not re.search(r"gwiazd|star", clean) or not re.search(r"opini|recenz|review", clean):
            continue
        rating_match = re.search(r"(?:^|\D)([1-5])(?:\D|$)", clean)
        if not rating_match:
            continue
        candidates = re.findall(r"\d[\d\s\u00a0\u202f.,]*", clean[rating_match.end():])
        values = [_number(item) for item in candidates]
        values = [item for item in values if item is not None]
        if values:
            result[int(rating_match.group(1))] = values[-1]
    return result


def _accept_cookies(page):
    for text in ("Zaakceptuj wszystko", "Odrzuć wszystko", "Accept all", "Reject all"):
        try:
            button = page.get_by_role("button", name=re.compile(f"^{re.escape(text)}$", re.I)).first
            if button.is_visible(timeout=700):
                button.click(timeout=2_000)
                page.wait_for_timeout(500)
                return
        except Exception:
            pass


def _open_reviews(page):
    candidates = page.locator("button, [role=button]")
    for index in range(min(candidates.count(), 250)):
        element = candidates.nth(index)
        try:
            label = " ".join(filter(None, [
                element.get_attribute("aria-label"), element.inner_text(timeout=100)
            ]))
            if re.search(r"\d", label) and re.search(r"opini|recenz|review", label, re.I):
                element.click(timeout=2_000)
                page.wait_for_timeout(800)
                return
        except Exception:
            pass


def get_rating_distribution(url: str) -> dict:
    """Pobiera pięć zbiorczych liczników. Treści opinii nie są odczytywane ani zapisywane."""
    try:
        with sync_playwright() as playwright:
            headless = os.environ.get("CHROMIUM_HEADLESS", "1").lower() not in {"0", "false", "no"}
            launch = {
                "headless": headless,
                "ignore_default_args": ["--enable-automation"],
                "args": [
                    "--disable-dev-shm-usage",
                    "--no-first-run",
                    "--disable-gpu",
                    "--disable-blink-features=AutomationControlled",
                ],
            }
            if os.environ.get("CHROMIUM_PATH"):
                launch["executable_path"] = os.environ["CHROMIUM_PATH"]
            profile_path = os.environ.get("CHROMIUM_PROFILE_PATH")
            browser = None
            if profile_path:
                # A headless systemd service has no desktop keyring. Use this only
                # with the dedicated, permission-restricted application profile.
                launch["args"].append("--password-store=basic")
                context = playwright.chromium.launch_persistent_context(
                    user_data_dir=profile_path,
                    locale="pl-PL",
                    viewport={"width": 1100, "height": 800},
                    **launch,
                )
            else:
                browser = playwright.chromium.launch(**launch)
                context = browser.new_context(locale="pl-PL", viewport={"width": 1100, "height": 800})
            try:
                page = context.pages[0] if context.pages else context.new_page()
                context.add_init_script(
                    "Object.defineProperty(navigator, 'webdriver', {get: () => undefined})"
                )
                page.goto(url, wait_until="domcontentloaded", timeout=30_000)
                _accept_cookies(page)
                _open_reviews(page)
                page.wait_for_timeout(700)
                labels = page.locator("[aria-label]").evaluate_all(
                    "els => els.map(el => el.getAttribute('aria-label')).filter(Boolean)"
                )
                counts = parse_distribution_labels(labels)
                if len(counts) != 5:
                    body_text = page.locator("body").inner_text().lower()
                    if "ograniczonego widoku" in body_text or "limited view" in body_text:
                        raise ScrapeError("Google włączyło ograniczony widok i ukryło opinie. Spróbuj później lub z innego łącza.")
                    raise ScrapeError("Nie udało się odczytać dokładnych pięciu liczników. Sprawdź link do miejsca.")
                ratings = {str(stars): counts[stars] for stars in range(5, 0, -1)}
                total = sum(ratings.values())
                average = round(sum(int(stars) * count for stars, count in ratings.items()) / total, 2) if total else 0
                return {"total": total, "average": average, "ratings": ratings}
            finally:
                context.close()
                if browser:
                    browser.close()
    except ScrapeError:
        raise
    except PlaywrightTimeoutError:
        raise ScrapeError("Google Maps nie odpowiedziało w wyznaczonym czasie.") from None
    except Exception as exc:
        if "Executable doesn't exist" in str(exc):
            raise ScrapeError("Chromium nie jest zainstalowane na serwerze.") from None
        raise