import urllib.parse
from pydantic import ValidationError
import requests
import pandas as pd
from utils.logger import setup_logger

logger = setup_logger()


def os_places_results_to_dataframe(data: dict) -> pd.DataFrame:
    """
    Flatten the OS Places API response results into a DataFrame.
    Each result contains either a DPA or LPI record.
    """
    results = data.get("results", [])
    rows = []
    for r in results:
        if "DPA" in r:
            rows.append(r["DPA"])
        elif "LPI" in r:
            rows.append(r["LPI"])
    return pd.DataFrame(rows)


def lookup_os_places(postcode: str, api_key: str) -> dict:
    """
    Lookup a postcode using the OS Places API.
    Returns the full API response data or an error dict.
    """
    if not api_key:
        return {"error": "Ordnance Survey API key not specified", "status": 400}

    encoded_postcode = urllib.parse.quote(postcode)
    url = (
        f"https://api.os.uk/search/places/v1/postcode?postcode={encoded_postcode}"
        f"&dataset=DPA,LPI&key={api_key}"
    )

    response = requests.get(url)
    if response.status_code != 200:
        logger.error(
            f"OS Places API error for postcode {postcode}: {response.status_code}"
        )
        return {"error": "Failed to fetch address data", "status": response.status_code}

    data = response.json()
    return {"data": data, "status": 200}