"""Rentman API client wrapper for equipment import and request submission."""
import httpx
import logging
import re
from typing import Any

from app.config import get_settings

logger = logging.getLogger(__name__)
settings = get_settings()

RENTMAN_BASE_URL = "https://api.rentman.net"


class RentmanService:
    """Wrapper around the Rentman REST API using httpx."""

    def __init__(self, token: str | None = None) -> None:
        self._token = token or settings.rentman_api_token
        self._base_url = RENTMAN_BASE_URL

    def _headers(self) -> dict[str, str]:
        return {
            "Authorization": f"Bearer {self._token}",
            "Content-Type": "application/json",
        }

    async def get_equipment_page(self, limit: int = 100, offset: int = 0) -> dict[str, Any]:
        """Fetch a single page of equipment from Rentman.

        Returns the raw JSON response dict with 'data' and optional 'itemCount'.
        """
        url = f"{self._base_url}/equipment"
        params = {"limit": limit, "offset": offset}
        async with httpx.AsyncClient(timeout=30.0) as client:
            resp = await client.get(url, headers=self._headers(), params=params)
            resp.raise_for_status()
            return resp.json()

    async def get_all_equipment(self, limit: int = 100) -> list[dict[str, Any]]:
        """Paginate through all equipment pages until data is empty."""
        all_items: list[dict[str, Any]] = []
        offset = 0
        while True:
            page = await self.get_equipment_page(limit=limit, offset=offset)
            data = page.get("data", [])
            if not data:
                break
            all_items.extend(data)
            offset += limit
        return all_items


    async def get_all_folders(self) -> list[dict[str, Any]]:
        """Paginate through all folders until data is empty."""
        all_folders: list[dict[str, Any]] = []
        offset = 0
        while True:
            url = f"{self._base_url}/folders"
            params = {"limit": 100, "offset": offset}
            async with httpx.AsyncClient(timeout=30.0) as client:
                resp = await client.get(url, headers=self._headers(), params=params)
                resp.raise_for_status()
                page = resp.json()
            data = page.get("data", [])
            if not data:
                break
            all_folders.extend(data)
            offset += 100
        return all_folders

    async def get_folder_map(self) -> dict[str, dict[str, str]]:
        """Build a map: folder path -> {category: top-level name, subcategory: folder name}.

        Walks the parent chain so every folder resolves to its top-level ancestor.
        """
        folders = await self.get_all_folders()
        by_path = {f"/folders/{f.get('id')}": f for f in folders}

        def top_ancestor(folder: dict) -> dict:
            current = folder
            seen = set()
            while current.get("parent") and current["parent"] not in seen:
                seen.add(current["parent"])
                parent = by_path.get(current["parent"])
                if not parent:
                    break
                current = parent
            return current

        folder_map: dict[str, dict[str, str]] = {}
        for path, folder in by_path.items():
            ancestor = top_ancestor(folder)
            folder_map[path] = {
                "category": ancestor.get("name", ""),
                "subcategory": folder.get("name", ""),
            }
        return folder_map

    async def get_file_url(self, file_id: str | int) -> str | None:
        """Fetch the S3 URL for a file from Rentman.

        GET /files/{file_id} → response contains 'url' field with S3 link.
        """
        url = f"{self._base_url}/files/{file_id}"
        try:
            async with httpx.AsyncClient(timeout=30.0) as client:
                resp = await client.get(url, headers=self._headers())
                resp.raise_for_status()
                data = resp.json()
                file_data = data.get("data", data)
                file_url = file_data.get("url")
                if file_url:
                    return file_url
                logger.warning("No url field in file response for file_id=%s", file_id)
                return None
        except Exception as exc:
            logger.warning("Failed to fetch file URL for file_id=%s: %s", file_id, exc)
            return None

    # Well-known rental brands for extraction from equipment names
    KNOWN_BRANDS = [
        "d&b audiotechnik", "d&b", "L-Acoustics", "Shure", "Sennheiser", "Pioneer",
        "RCF", "Soundcraft", "Cameo", "Eurolite", "Globaltruss", "Klotz",
        "Martin", "JBL", "QSC", "Yamaha", "Behringer", "ROBE", "Chauvet",
        "PL-Audio", "Showtec", "American DJ", "ADJ", "GLP", "Wireless Solution",
        "Sennheiser", "AKG", "Rode", "Audix", "Palmer", "Neutrik", "Layher",
    ]

    @staticmethod
    def _strip_html(text: str) -> str:
        """Remove HTML tags and normalize whitespace in description fields."""
        if not text:
            return ""
        text = re.sub(r"<br\s*/?>", "\n", text, flags=re.IGNORECASE)
        text = re.sub(r"</p>", "\n", text, flags=re.IGNORECASE)
        text = re.sub(r"<[^>]+>", "", text)
        text = text.replace("&nbsp;", " ").replace("&amp;", "&")
        text = text.replace("&lt;", "<").replace("&gt;", ">").replace("&quot;", '"')
        text = re.sub(r"[ \t]+", " ", text)
        text = re.sub(r"\n\s*\n+", "\n\n", text)
        return text.strip()

    def _extract_brand(self, name: str) -> str:
        """Extract a known brand from the equipment name, if present."""
        lowered = (name or "").lower()
        for brand in self.KNOWN_BRANDS:
            if lowered.startswith(brand.lower() + " ") or lowered.startswith(brand.lower() + "-"):
                return brand
        return ""

    def _resolve_category(self, folder_path: str | None, folder_map: dict[str, dict[str, str]] | None) -> tuple[str, str]:
        """Resolve (category, subcategory) from the Rentman folder path.

        category = top-level folder name (e.g. "Tontechnik")
        subcategory = direct folder name (e.g. "Mikrofone")
        """
        if not folder_path or not folder_map:
            return "", ""
        info = folder_map.get(folder_path)
        if not info:
            return "", ""
        return info.get("category", ""), info.get("subcategory", "")

    def _build_specifications(self, raw: dict[str, Any]) -> dict[str, Any]:
        """Collect physical specs from flat Rentman fields when set."""
        specs: dict[str, Any] = {}
        field_map = [
            ("Leistung (W)", "power"),
            ("Gewicht (kg)", "empty_weight"),
            ("Hoehe (mm)", "height"),
            ("Breite (mm)", "width"),
            ("Laenge (mm)", "length"),
            ("Volumen (m3)", "volume"),
        ]
        for label, key in field_map:
            value = raw.get(key)
            if isinstance(value, (int, float)) and value > 0:
                specs[label] = value
        return specs

    async def transform_equipment(
        self,
        raw: dict[str, Any],
        folder_map: dict[str, dict[str, str]] | None = None,
    ) -> dict[str, Any]:
        """Map a raw Rentman equipment object to equipment_cache schema.

        Uses the real Rentman field names:
        - price -> rental_price (per day, shop price)
        - folder ("/folders/N") -> category/subcategory via folder_map
        - shop_description_long (fallbacks: shop_description_short,
          external_remark) -> description (HTML stripped)
        - code -> number (article number)
        - in_shop/in_archive -> availability for the public catalog
        """
        image_path = raw.get("image")
        image_urls: list[str] = []

        if image_path and isinstance(image_path, str):
            match = re.search(r"/files/(\d+)", image_path)
            if match:
                file_id = match.group(1)
                s3_url = await self.get_file_url(file_id)
                if s3_url:
                    image_urls = [s3_url]

        category, subcategory = self._resolve_category(raw.get("folder"), folder_map)

        description = self._strip_html(
            raw.get("shop_description_long")
            or raw.get("shop_description_short")
            or raw.get("external_remark")
            or ""
        )

        price = raw.get("price")
        try:
            price = float(price) if price is not None else None
        except (TypeError, ValueError):
            price = None

        available = bool(raw.get("in_shop")) and not bool(raw.get("in_archive")) and not bool(raw.get("temporary"))

        return {
            "rentman_id": str(raw.get("id", "")),
            "name": raw.get("name", "") or raw.get("displayname", ""),
            "number": raw.get("code", "") or raw.get("number", ""),
            "category": category,
            "subcategory": subcategory,
            "description": description,
            "specifications": self._build_specifications(raw) or None,
            "images": image_urls,
            "rental_price": price,
            "brand": self._extract_brand(raw.get("name", "")),
            "available": available,
            "update_hash": raw.get("updateHash", ""),
        }

    async def create_project_request(self, payload: dict[str, Any]) -> dict[str, Any]:
        """POST /projectrequests to create a new project request in Rentman."""
        url = f"{self._base_url}/projectrequests"
        async with httpx.AsyncClient(timeout=30.0) as client:
            resp = await client.post(url, headers=self._headers(), json=payload)
            resp.raise_for_status()
            return resp.json()

    async def add_equipment_to_request(
        self, request_id: str, equipment_payload: dict[str, Any]
    ) -> dict[str, Any]:
        """POST /projectrequests/{id}/projectrequestequipment for a single item."""
        url = f"{self._base_url}/projectrequests/{request_id}/projectrequestequipment"
        async with httpx.AsyncClient(timeout=30.0) as client:
            resp = await client.post(url, headers=self._headers(), json=equipment_payload)
            resp.raise_for_status()
            return resp.json()

    @staticmethod
    def build_project_request_payload(data: dict[str, Any]) -> dict[str, Any]:
        """Map frontend rental request data to Rentman POST /projectrequests payload."""
        date_start = data.get("date_start")
        date_end = data.get("date_end")

        contact_name = data.get("contact_name", "")
        parts = contact_name.strip().split(" ", 1)
        first_name = parts[0] if parts else ""
        last_name = parts[1] if len(parts) > 1 else ""

        street = data.get("contact_street", "")
        house_number = ""
        if street:
            match = re.search(r"(\d+[a-zA-Z]*)", street)
            if match:
                house_number = match.group(1)

        return {
            "name": data.get("event_name", ""),
            "planperiod_start": f"{date_start}T08:00:00+02:00" if date_start else None,
            "planperiod_end": f"{date_end}T02:00:00+02:00" if date_end else None,
            "usageperiod_start": f"{date_start}T18:00:00+02:00" if date_start else None,
            "usageperiod_end": f"{date_end}T23:59:00+02:00" if date_end else None,
            "contact_name": data.get("contact_company") or data.get("contact_name", ""),
            "contact_person_first_name": first_name,
            "contact_person_lastname": last_name,
            "contact_person_email": data.get("contact_email", ""),
            "contact_person_phone": data.get("contact_phone", ""),
            "location_name": data.get("location", ""),
            "location_mailing_street": street,
            "location_mailing_number": house_number,
            "location_mailing_postalcode": data.get("contact_postalcode", ""),
            "location_mailing_city": data.get("contact_city") or data.get("location", ""),
            "remark": data.get("message", ""),
        }

    @staticmethod
    def build_equipment_payload(item: dict[str, Any]) -> dict[str, Any]:
        """Map a single rental request item to Rentman projectrequestequipment payload."""
        return {
            "name": item.get("equipment_name", ""),
            "quantity": item.get("quantity", 1),
            "quantity_total": item.get("quantity", 1),
            "unit_price": item.get("unit_price", 0),
            "linked_equipment": f"/equipment/{item.get('rentman_equipment_id', '')}" if item.get("rentman_equipment_id") else None,
        }