# ====================================================
# web_search.py
# ====================================================

"""
Minimal Tavily wrapper: run a web search and return a list of UDISE codes.

Enhancement:
- Optional village support for more precise queries
"""

import os
import re
from typing import List, Optional

# optional Tavily SDK
try:
    from tavily import TavilyClient
except Exception:
    TavilyClient = None

# ----------------------------------------------------
# State → UDISE prefix mapping
# ----------------------------------------------------
STATE_TO_UDISE_CODE = {
    "Jammu & Kashmir": "01", "Himachal Pradesh": "02", "Punjab": "03",
    "Chandigarh": "04", "Uttarakhand": "05", "Haryana": "06", "Delhi": "07",
    "Rajasthan": "08", "Uttar Pradesh": "09", "Bihar": "10", "Sikkim": "11",
    "Arunachal Pradesh": "12", "Nagaland": "13", "Manipur": "14", "Mizoram": "15",
    "Tripura": "16", "Meghalaya": "17", "Assam": "18", "West Bengal": "19",
    "Jharkhand": "20", "Odisha": "21", "Chhattisgarh": "22",
    "Madhya Pradesh": "23", "Gujarat": "24", "Daman & Diu": "25",
    "Dadra & Nagar Haveli": "26", "Maharashtra": "27",
    "Andhra Pradesh": "28", "Karnataka": "29", "Goa": "30",
    "Lakshadweep": "31", "Kerala": "32", "Tamil Nadu": "33",
    "Puducherry": "34", "Andaman & Nicobar Islands": "35",
    "Telangana": "36", "Ladakh": "37",
}

# strict 11-digit UDISE match
_UDISE_RE = re.compile(r"(?<!\d)(\d{11})(?!\d)")


# ----------------------------------------------------
# Query builder (Village-aware)
# ----------------------------------------------------
def _build_query(
    school_name: Optional[str],
    state_name: Optional[str],
    district: Optional[str],
    village: Optional[str] = None,
) -> str:
    parts = ["UDISE code of"]

    if school_name:
        parts.append(f"School {school_name.strip()}")

    if village:
        parts.append(f"in village {village.strip()}")

    if district:
        parts.append(f"district {district.strip()}")

    if state_name:
        parts.append(f"state {state_name.strip()}")

    return " ".join(parts).strip()


def _call_tavily(api_key: Optional[str], query: str):
    key = api_key or os.getenv("TAVILY_API_KEY")
    if not key:
        return {"ok": False, "error": "No Tavily API key provided."}
    if TavilyClient is None:
        return {"ok": False, "error": "tavily package not installed."}
    try:
        client = TavilyClient(key)
        print(query)
        resp = client.search(query=query, country="india")
        print(resp)
        return {"ok": True, "data": resp}
    except Exception as e:
        return {"ok": False, "error": str(e)}


def _normalize_state_key(state_name: Optional[str]) -> Optional[str]:
    if not state_name:
        return None

    cleaned = re.sub(r"[^A-Za-z]", "", state_name).lower()
    for k in STATE_TO_UDISE_CODE:
        if re.sub(r"[^A-Za-z]", "", k).lower() == cleaned:
            return k
    return None


# ----------------------------------------------------
# Public API
# ----------------------------------------------------
def tavily_search_codes(
    school_name: Optional[str],
    state_name: Optional[str] = None,
    district: Optional[str] = None,
    village: Optional[str] = None,
    api_key: Optional[str] = None,
    enforce_state_prefix: bool = True,
) -> List[str]:
    """
    Perform a Tavily search and return a list of unique UDISE codes.

    Village is used only to improve search precision.
    """

    if not school_name:
        return []

    query = _build_query(school_name, state_name, district, village)
    call = _call_tavily(api_key, query)

    if not call.get("ok"):
        return []

    raw = call.get("data") or {}
    snippets = []

    if isinstance(raw, dict):
        candidates = (
            raw.get("results")
            or raw.get("data", {}).get("results")
            or raw.get("items")
            or []
        )
        for item in candidates:
            if isinstance(item, dict):
                snippets.append(
                    " ".join(
                        [
                            str(item.get("title", "")),
                            str(item.get("content", "")),
                            str(item.get("text", "")),
                            str(item.get("url", "")),
                        ]
                    )
                )
            else:
                snippets.append(str(item))
    elif isinstance(raw, list):
        snippets = [str(x) for x in raw]
    else:
        snippets = [str(raw)]

    allowed_prefix = None
    state_key = _normalize_state_key(state_name)
    if enforce_state_prefix and state_key:
        allowed_prefix = STATE_TO_UDISE_CODE.get(state_key)

    found, seen = [], set()
    for text in snippets:
        for m in _UDISE_RE.finditer(text):
            code = m.group(1)
            if code in seen:
                continue

            prefix = code[:2]
            if prefix not in STATE_TO_UDISE_CODE.values():
                continue
            if allowed_prefix and prefix != allowed_prefix:
                continue

            seen.add(code)
            found.append(code)

    return found