import re
import httpx
from datetime import date, timedelta
from .base import BaseProfile

API_BASE = "https://api.travelclick.com"
TOKEN_URL = f"{API_BASE}/oauth/token-referer?grant_type=client_credentials"

HEADERS_BASE = {
    "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36",
    "Accept": "application/json",
    "Content-Type": "application/json",
}


async def _get_token(client, referer: str) -> str:
    r = await client.post(TOKEN_URL, headers={**HEADERS_BASE, "Referer": referer}, timeout=20)
    r.raise_for_status()
    return r.json()["access_token"]


def _auth_headers(token: str, referer: str) -> dict:
    return {**HEADERS_BASE, "Authorization": f"Bearer {token}", "Referer": referer}


class TravelClickProfile(BaseProfile):
    name = "travelclick"
    label = "TravelClick / Amadeus"
    required_params = [
        {"key": "hotel_code", "label": "Hotel Code",
         "help": "Numeric hotel ID, e.g. 77346 — visible in the booking engine network requests"},
        {"key": "booking_url", "label": "Booking URL Base",
         "help": "e.g. https://reservations.bespokehotels.com/noelarmshotel/book/dates-of-stay"},
    ]

    @classmethod
    def detect(cls, url: str) -> dict | None:
        m = re.search(r'(https://reservations\.bespokehotels\.com/[^/]+/book/[^?#\s]+)', url)
        if not m:
            return None
        booking_url = m.group(1)
        # hotel_code is in inline JS as bookingEngineHotelId: '77346' on the booking page
        hotel_code = ""
        try:
            r = httpx.get(booking_url, timeout=10, follow_redirects=True,
                          headers={"User-Agent": "Mozilla/5.0"})
            hm = re.search(r'bookingEngineHotelId\s*:\s*[\'"](\d+)[\'"]', r.text)
            if hm:
                hotel_code = hm.group(1)
        except Exception:
            pass
        return {"booking_url": booking_url, "hotel_code": hotel_code}

    async def fetch_category_names(self, client, params: dict) -> tuple[dict[str, str], dict[str, str]]:
        hotel_code = params["hotel_code"]
        referer = params["booking_url"]
        token = await _get_token(client, referer)
        r = await client.get(
            f"{API_BASE}/be5-entity/v2/hotels/{hotel_code}/content",
            params={"include": "roomtypes,rateplans", "lang": "EN_US"},
            headers=_auth_headers(token, referer),
            timeout=30,
        )
        r.raise_for_status()
        data = r.json()
        # roomtypes[].roomTypeId (numeric, used as roomId in avail) -> roomTypeName
        room_labels = {
            str(rt["roomTypeId"]): rt.get("roomTypeName", str(rt["roomTypeId"]))
            for rt in data.get("roomtypes", [])
        }
        # ratePlans[].rateplanId (numeric, used as rateId in avail) -> rateplanName
        rate_labels = {
            str(rp["rateplanId"]): rp.get("rateplanName", str(rp["rateplanId"]))
            for rp in data.get("ratePlans", [])
        }
        return room_labels, rate_labels

    async def fetch_arrival_dates(self, client, params: dict) -> list[str]:
        hotel_code = params["hotel_code"]
        referer = params["booking_url"]
        token = await _get_token(client, referer)
        today = date.today()
        end = today + timedelta(days=365)
        body = {
            "hotelCode": int(hotel_code),
            "currency": "GBP",
            "lang": "EN_US",
            "dateIn": today.isoformat(),
            "dateOut": end.isoformat(),
            "multiRoomOccupancy": [{"adults": 2, "infant": 0, "children": 0}],
            "bookerIdentifier": "",
            "partnerIdentifier": "",
        }
        r = await client.post(
            f"{API_BASE}/be5-shop/v1/hotel/{hotel_code}/basicavail/multi-room",
            json=body,
            headers=_auth_headers(token, referer),
            timeout=30,
        )
        r.raise_for_status()
        data = r.json()
        return [
            d["date"]
            for d in data.get("dates", [])
            if d.get("isAvailable") and d["date"] >= today.isoformat()
        ]

    async def fetch_night_rates(self, client, params: dict, arrival: str, nights: int = 1) -> list[dict]:
        hotel_code = params["hotel_code"]
        referer = params["booking_url"]
        token = await _get_token(client, referer)
        departure = (date.fromisoformat(arrival) + timedelta(days=nights)).isoformat()
        body = {
            "roomStay": {
                "startDate": arrival,
                "endDate": departure,
                "guestCount": {"adults": 2, "infants": 0, "children": {"ages": None, "count": 0}},
                "roomQuantity": 1,
                "productSearchCriteria": {
                    "sortingPreference": "SORT_BY_ORDER",
                    "includeUnavailable": False,
                },
            },
            "languageCode": "EN_US",
            "disableLocaitonSharing": False,
            "currencyCode": "GBP",
            "tpaExtension": [],
            "includeMemberRate": True,
            "includeNightlyRates": True,
        }
        r = await client.post(
            f"{API_BASE}/be5-shop/v2/hotels/{hotel_code}/avail",
            json=body,
            headers=_auth_headers(token, referer),
            timeout=30,
        )
        if r.status_code == 404:
            return []
        r.raise_for_status()

        data = r.json()
        # Response: roomStays[0].roomtypes[].products[] (both Regular rates and Packages)
        room_stay = (data.get("roomStays") or [{}])[0]
        rooms = []
        for rt in room_stay.get("roomtypes", []):
            room_id = str(rt["roomtypeId"])
            for product in rt.get("products", []):
                rate_id = str(product["productId"])
                nightly = product.get("nightlyRates", [])
                if not nightly:
                    continue
                avail = nightly[0].get("inventoryCount", 0)
                prices = [
                    {"amountBeforeTax": n["amountBeforeTax"], "amountAfterTax": n.get("amountTotal", n["amountBeforeTax"])}
                    for n in nightly
                ]
                rooms.append({
                    "roomId": room_id,
                    "rateId": rate_id,
                    "availability": avail,
                    "prices": prices,
                    "min_stay_nights": None,  # min-stay comes from basicavail per date
                    "currencyCode": "GBP",
                })

        return rooms