"""Parser for Volunteer Storage — Maryville 2, TN.

The page uses the Osprey Storage / StorEdge "vapor-unit-table" WordPress
plugin which loads unit data via client-side API. The server-rendered HTML
contains only loading skeletons, but the page embeds a JSON-LD ``@graph``
block with a ``SelfStorage`` entity whose ``hasOfferCatalog`` lists all
unit groups as ``Product`` objects.

This facility has storage units and vehicle parking spaces. The ``name``
field encodes dimensions and category (e.g. "10x10 - Uncovered Parking",
"8x10 - Small").
"""

from __future__ import annotations

import json
import re

from bs4 import BeautifulSoup

from src.parsers.base import BaseParser, ParseResult, UnitResult

_SIZE_RE = re.compile(r"(\d+(?:\.\d+)?)\s*[xX]\s*(\d+(?:\.\d+)?)")


class Facility112073Parser(BaseParser):
    """Extract storage units from Volunteer Storage Maryville 2 (JSON-LD)."""

    platform = "custom_facility_112073"

    def parse(self, html: str, url: str = "") -> ParseResult:
        soup = BeautifulSoup(html, "lxml")
        result = ParseResult(platform=self.platform, parser_name=self.__class__.__name__)

        products = self._find_products(soup)
        if not products:
            result.warnings.append("No SelfStorage hasOfferCatalog found in JSON-LD")
            return result

        seen: set[tuple[str, float | None]] = set()
        for product in products:
            offers = product.get("offers", {})
            raw_price = offers.get("price")

            # Skip products with no price
            if raw_price is None:
                continue

            price: float | None = None
            try:
                price = float(raw_price)
            except (TypeError, ValueError):
                price = self.normalize_price(str(raw_price))

            name = product.get("name", "")
            availability = offers.get("availability", "")

            # Parse size from name like "10x10 - Uncovered Parking"
            m = _SIZE_RE.search(name)
            if not m:
                continue

            width = float(m.group(1))
            length = float(m.group(2))
            size = f"{m.group(1)}x{m.group(2)}"

            key = (size, price)
            if key in seen:
                continue
            seen.add(key)

            # Determine category from name suffix
            category = ""
            if " - " in name:
                category = name.split(" - ", 1)[1].strip()

            is_available = "OutOfStock" not in availability

            metadata: dict = {
                "width": width,
                "length": length,
                "sqft": width * length,
            }
            if category:
                metadata["category"] = category
            if not is_available:
                metadata["available"] = False

            unit = UnitResult(
                size=size,
                price=price,
                description=name,
                url=url,
                metadata=metadata,
            )
            result.units.append(unit)

        if not result.units:
            result.warnings.append("No valid units found in JSON-LD")

        return result

    @staticmethod
    def _find_products(soup: BeautifulSoup) -> list[dict]:
        """Locate Product items from SelfStorage JSON-LD."""
        for script in soup.find_all("script", type="application/ld+json"):
            raw = script.string or ""
            if not raw.strip():
                continue
            try:
                data = json.loads(raw)
            except (json.JSONDecodeError, ValueError):
                continue

            # Check @graph for SelfStorage entity
            if isinstance(data, dict) and "@graph" in data:
                for item in data["@graph"]:
                    if not isinstance(item, dict):
                        continue
                    item_type = item.get("@type", "")
                    if isinstance(item_type, list):
                        item_type = " ".join(item_type)
                    if "SelfStorage" in str(item_type):
                        catalog = item.get("hasOfferCatalog", {})
                        products = catalog.get("itemListElement", [])
                        if products:
                            return products

            # Direct SelfStorage at top level
            if isinstance(data, dict):
                item_type = data.get("@type", "")
                if isinstance(item_type, list):
                    item_type = " ".join(item_type)
                if "SelfStorage" in str(item_type):
                    catalog = data.get("hasOfferCatalog", {})
                    products = catalog.get("itemListElement", [])
                    if products:
                        return products

        return []