import json
import re
from datetime import date, timedelta
from urllib.parse import quote
from .base import BaseProfile

API_BASE = "https://direct-book.com"

SETTINGS_HASH = "52d786f5c45232c8c16022bc3af6dab2e1994f4919b953afafe188095125e9b6"
QUOTESETS_HASH = "1012a6203854357e44786380240eefad6b2ad863aee6ba79748c81a851f29217"
ROOMTYPES_HASH = "8021345a2e1f993717b1960097489b456a6b2dc136990b6f919adba1b1fe2c1f"

HEADERS = {
    "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36",
    "Accept": "application/json",
    # Required to bypass Apollo CSRF protection on the /api/graphql endpoint
    "Content-Type": "application/json",
}


def _graphql_url(operation: str, variables: dict, sha256: str) -> str:
    return (
        f"{API_BASE}/api/graphql"
        f"?operationName={operation}"
        f"&variables={_json_compact(variables)}"
        f"&extensions={_json_compact({'persistedQuery': {'version': 1, 'sha256Hash': sha256}})}"
    )


def _json_compact(obj) -> str:
    return quote(json.dumps(obj, separators=(',', ':')), safe='')


async def _get_property_id(client, channel_code: str) -> str:
    """Fetch numeric propertyId from settings query."""
    url = _graphql_url("settings", {"channelCode": channel_code}, SETTINGS_HASH)
    r = await client.get(url, headers=HEADERS, timeout=20)
    r.raise_for_status()
    return str(r.json()["data"]["settings"]["uuid"])


class DirectBookProfile(BaseProfile):
    name = "directbook"
    label = "SiteMinder Direct Book"
    required_params = [
        {"key": "channel_code", "label": "Channel Code",
         "help": "The property slug in the booking URL, e.g. 'grapevinestowdirect'"},
    ]

    @classmethod
    def detect(cls, url: str) -> dict | None:
        m = re.search(r'direct-book\.com/properties/([^/?#\s]+)', url)
        if m:
            return {"channel_code": m.group(1)}
        return None

    async def fetch_category_names(self, client, params: dict) -> tuple[dict[str, str], dict[str, str]]:
        channel_code = params["channel_code"]
        url = _graphql_url(
            "roomTypes",
            {"channelCode": channel_code, "checkInDate": date.today().isoformat(),
             "checkOutDate": (date.today() + timedelta(days=1)).isoformat(), "locale": "en"},
            ROOMTYPES_HASH,
        )
        r = await client.get(url, headers=HEADERS, timeout=30)
        r.raise_for_status()
        room_types = r.json()["data"]["roomTypes"]

        room_labels = {rt["uuid"]: rt["name"] for rt in room_types}
        rate_labels = {}
        for rt in room_types:
            for rate in rt.get("rates", []):
                rate_labels[rate["uuid"]] = rate["name"]
        return room_labels, rate_labels

    async def fetch_arrival_dates(self, client, params: dict) -> list[str]:
        channel_code = params["channel_code"]
        today = date.today()

        # Fetch 12 months of availability in monthly chunks (API seems to accept wide ranges too)
        end = today.replace(day=1) + timedelta(days=365)
        # Build monthly windows to stay within API limits
        available_dates: list[str] = []
        current = today.replace(day=1)
        while current <= end:
            # Last day of the month
            if current.month == 12:
                month_end = current.replace(year=current.year + 1, month=1, day=1) - timedelta(days=1)
            else:
                month_end = current.replace(month=current.month + 1, day=1) - timedelta(days=1)

            check_from = max(today, current).isoformat()
            check_to = month_end.isoformat()

            url = (
                f"{API_BASE}/api/properties/{channel_code}/availability"
                f"?checkInsFrom={check_from}&checkInsTo={check_to}"
            )
            try:
                r = await client.get(url, headers=HEADERS, timeout=20)
                r.raise_for_status()
                for entry in r.json().get("result", []):
                    if entry.get("canCheckIn"):
                        d = entry["date"][:10]
                        if d >= today.isoformat():
                            available_dates.append(d)
            except Exception:
                pass

            # Advance to next month
            if current.month == 12:
                current = current.replace(year=current.year + 1, month=1)
            else:
                current = current.replace(month=current.month + 1)

        return sorted(set(available_dates))

    async def fetch_night_rates(self, client, params: dict, arrival: str, nights: int = 1) -> list[dict]:
        channel_code = params["channel_code"]

        # Get propertyId (numeric) — cache it on the params dict to avoid repeat fetches
        if "property_id" not in params:
            params["property_id"] = await _get_property_id(client, channel_code)
        property_id = int(params["property_id"])

        departure = (date.fromisoformat(arrival) + timedelta(days=nights)).isoformat()

        url = _graphql_url(
            "quoteSets",
            {
                "propertyId": property_id,
                "promocode": "",
                "checkInDate": arrival,
                "checkOutDate": departure,
                "adults": 2,
                "children": 0,
                "infants": 0,
                "currencyFrom": "GBP",
                "currencyTo": "GBP",
            },
            QUOTESETS_HASH,
        )
        r = await client.get(url, headers=HEADERS, timeout=20)
        if r.status_code == 404:
            return []
        r.raise_for_status()

        rooms = []
        for qs in r.json()["data"].get("quoteSets", []):
            room_id = str(qs["roomTypeId"])
            for quote in qs.get("quotes", []):
                rate_id = str(quote["roomRateId"])
                price = quote["price"]["amount"]
                available = quote.get("available", 0)

                # Build per-night prices from breakdown if multi-night
                breakdown = quote.get("breakdown", [])
                if breakdown:
                    prices = [
                        {"amountBeforeTax": b["price"]["amount"], "amountAfterTax": b["price"]["amount"]}
                        for b in breakdown
                    ]
                else:
                    prices = [{"amountBeforeTax": price, "amountAfterTax": price}]

                rooms.append({
                    "roomId": room_id,
                    "rateId": rate_id,
                    "availability": available,
                    "prices": prices,
                    "min_stay_nights": None,
                    "currencyCode": "GBP",
                })

        return rooms