import random
import re
from html import unescape
from html.parser import HTMLParser
from urllib.parse import urljoin
from urllib.request import Request, urlopen


CHEFKOCH_TODAY_URL = "https://www.chefkoch.de/rezepte/was-koche-ich-heute/"

FALLBACK_RECIPES = [
    {
        "title": "Cremige Pasta mit Tomaten",
        "url": "https://www.chefkoch.de/",
        "image_url": "",
        "meta": "ca. 25 Minuten",
    },
    {
        "title": "Kartoffel-Brokkoli-Auflauf",
        "url": "https://www.chefkoch.de/",
        "image_url": "",
        "meta": "vegetarisch",
    },
    {
        "title": "Schnelle Reispfanne",
        "url": "https://www.chefkoch.de/",
        "image_url": "",
        "meta": "einfach",
    },
    {
        "title": "Wraps mit Hähnchen",
        "url": "https://www.chefkoch.de/",
        "image_url": "",
        "meta": "schnell",
    },
    {
        "title": "Gemüse-Curry",
        "url": "https://www.chefkoch.de/",
        "image_url": "",
        "meta": "würzig",
    },
    {
        "title": "Ofenkartoffeln mit Dip",
        "url": "https://www.chefkoch.de/",
        "image_url": "",
        "meta": "günstig",
    },
    {
        "title": "Gnocchi-Pfanne",
        "url": "https://www.chefkoch.de/",
        "image_url": "",
        "meta": "15 Minuten",
    },
    {
        "title": "Pizza-Toast",
        "url": "https://www.chefkoch.de/",
        "image_url": "",
        "meta": "MVP-Klassiker",
    },
]


class ChefkochTodayParser(HTMLParser):
    def __init__(self):
        super().__init__()
        self.recipes = []
        self._current_link = None
        self._current_text = []
        self._current_image_url = ""

    def handle_starttag(self, tag, attrs):
        attrs = dict(attrs)
        if tag == "a":
            href = attrs.get("href", "")
            if re.search(r"/rezepte/\d+/.+\.html", href):
                self._current_link = urljoin(CHEFKOCH_TODAY_URL, href)
                self._current_text = []
                self._current_image_url = ""
        elif tag == "img" and self._current_link:
            self._current_image_url = attrs.get("src") or attrs.get("data-src") or ""

    def handle_data(self, data):
        if self._current_link:
            self._current_text.append(data)

    def handle_endtag(self, tag):
        if tag != "a" or not self._current_link:
            return

        title, meta = parse_recipe_text(" ".join(self._current_text))
        if title and not any(recipe["url"] == self._current_link for recipe in self.recipes):
            self.recipes.append(
                {
                    "title": title,
                    "url": self._current_link,
                    "image_url": self._current_image_url,
                    "meta": meta,
                }
            )

        self._current_link = None
        self._current_text = []
        self._current_image_url = ""


def parse_recipe_text(text):
    text = unescape(re.sub(r"\s+", " ", text)).strip()
    text = text.replace("rating_star", "").strip()

    rating_match = re.match(r"(?P<rating>\d+[,.]\d)\s*/?\s*5?\s*\((?P<count>\d+)\)\s*(?P<title>.+)", text)
    if rating_match:
        rating = rating_match.group("rating")
        count = rating_match.group("count")
        title = clean_recipe_title(rating_match.group("title"))
        return title, f"{rating}/5 ({count})"

    return clean_recipe_title(text), ""


def clean_recipe_title(title):
    title = re.sub(r"\s+von\s+essen\s*&\s*trinken.*$", "", title, flags=re.IGNORECASE)
    title = re.sub(r"[^\w\sÄÖÜäöüß.,&'’:/()\-]", "", title)
    return re.sub(r"\s+", " ", title).strip()


def fetch_chefkoch_today_recipes():
    cache_buster = random.randint(100000, 999999)
    request = Request(
        f"{CHEFKOCH_TODAY_URL}?rf={cache_buster}",
        headers={
            "User-Agent": "Mozilla/5.0 (compatible; RezeptFinder/1.0)",
            "Cache-Control": "no-cache",
        },
    )
    with urlopen(request, timeout=8) as response:
        html = response.read().decode("utf-8", errors="replace")

    parser = ChefkochTodayParser()
    parser.feed(html)
    return parser.recipes[:8]


def get_recipes():
    try:
        recipes = fetch_chefkoch_today_recipes()
    except Exception:
        return FALLBACK_RECIPES

    return recipes or FALLBACK_RECIPES