"""
Alpha Vantage financial API client.

Stock and cryptocurrency quotes.
https://www.alphavantage.co/documentation/

Requires API key (free tier available).
"""

import httpx
import logging
from datetime import datetime
from typing import Optional

from .base import FinancialProvider, StockQuote

logger = logging.getLogger(__name__)


class AlphaVantageProvider(FinancialProvider):
    """Alpha Vantage financial API implementation."""

    BASE_URL = "https://www.alphavantage.co/query"

    def __init__(self, api_key: str, timeout: int = 10):
        """
        Initialize Alpha Vantage client.

        Args:
            api_key: Alpha Vantage API key
            timeout: HTTP request timeout in seconds
        """
        self.api_key = api_key
        self.timeout = timeout
        self._client: Optional[httpx.AsyncClient] = None

    @property
    def client(self) -> httpx.AsyncClient:
        """Lazy-initialize HTTP client."""
        if self._client is None or self._client.is_closed:
            self._client = httpx.AsyncClient(timeout=self.timeout)
        return self._client

    async def close(self):
        """Close HTTP client."""
        if self._client and not self._client.is_closed:
            await self._client.aclose()
            self._client = None

    async def get_quote(self, symbol: str) -> Optional[StockQuote]:
        """
        Get current quote for a stock symbol.

        Args:
            symbol: Stock ticker symbol (e.g., "AAPL", "MSFT")

        Returns:
            StockQuote with current price info or None if not found
        """
        try:
            response = await self.client.get(
                self.BASE_URL,
                params={
                    "function": "GLOBAL_QUOTE",
                    "symbol": symbol.upper(),
                    "apikey": self.api_key
                }
            )
            response.raise_for_status()
            data = response.json()

            # Check for API errors
            if "Error Message" in data:
                logger.warning(f"Alpha Vantage error for {symbol}: {data['Error Message']}")
                return None

            if "Note" in data:
                # Rate limit warning
                logger.warning(f"Alpha Vantage rate limit: {data['Note']}")
                return None

            quote = data.get("Global Quote", {})
            if not quote:
                logger.warning(f"No quote data for symbol: {symbol}")
                return None

            # Parse quote data
            price = float(quote.get("05. price", 0))
            change = float(quote.get("09. change", 0))
            change_percent_str = quote.get("10. change percent", "0%")
            change_percent = float(change_percent_str.rstrip('%'))

            return StockQuote(
                symbol=symbol.upper(),
                name=None,  # Global Quote doesn't include company name
                price=price,
                currency="USD",  # Alpha Vantage returns USD for US stocks
                change=change,
                change_percent=change_percent,
                timestamp=datetime.now()
            )

        except httpx.HTTPError as e:
            logger.error(f"Alpha Vantage request failed for {symbol}: {e}")
            return None
        except (KeyError, ValueError) as e:
            logger.error(f"Failed to parse Alpha Vantage response for {symbol}: {e}")
            return None

    async def get_quotes(self, symbols: list[str]) -> list[StockQuote]:
        """
        Get quotes for multiple stock symbols.

        Note: Alpha Vantage free tier has rate limits (5 calls/min, 500 calls/day).
        Consider using batch endpoints or caching for production use.

        Args:
            symbols: List of stock ticker symbols

        Returns:
            List of StockQuote objects (may be less than input if some fail)
        """
        quotes = []
        for symbol in symbols:
            quote = await self.get_quote(symbol)
            if quote:
                quotes.append(quote)
        return quotes

    async def get_crypto_quote(
        self,
        symbol: str,
        market: str = "USD"
    ) -> Optional[StockQuote]:
        """
        Get current quote for a cryptocurrency.

        Args:
            symbol: Crypto symbol (e.g., "BTC", "ETH")
            market: Market currency (default: USD)

        Returns:
            StockQuote with current price info or None if not found
        """
        try:
            response = await self.client.get(
                self.BASE_URL,
                params={
                    "function": "CURRENCY_EXCHANGE_RATE",
                    "from_currency": symbol.upper(),
                    "to_currency": market.upper(),
                    "apikey": self.api_key
                }
            )
            response.raise_for_status()
            data = response.json()

            # Check for API errors
            if "Error Message" in data:
                logger.warning(f"Alpha Vantage error for {symbol}: {data['Error Message']}")
                return None

            if "Note" in data:
                logger.warning(f"Alpha Vantage rate limit: {data['Note']}")
                return None

            rate_data = data.get("Realtime Currency Exchange Rate", {})
            if not rate_data:
                logger.warning(f"No exchange rate data for: {symbol}/{market}")
                return None

            price = float(rate_data.get("5. Exchange Rate", 0))

            return StockQuote(
                symbol=f"{symbol.upper()}/{market.upper()}",
                name=rate_data.get("2. From_Currency Name"),
                price=price,
                currency=market.upper(),
                change=None,  # Exchange rate endpoint doesn't provide change
                change_percent=None,
                timestamp=datetime.now()
            )

        except httpx.HTTPError as e:
            logger.error(f"Alpha Vantage crypto request failed for {symbol}: {e}")
            return None
        except (KeyError, ValueError) as e:
            logger.error(f"Failed to parse Alpha Vantage crypto response for {symbol}: {e}")
            return None

    async def search_symbol(self, keywords: str) -> list[dict]:
        """
        Search for stock symbols by keywords.

        Args:
            keywords: Search keywords (company name or partial symbol)

        Returns:
            List of matching symbols with metadata
        """
        try:
            response = await self.client.get(
                self.BASE_URL,
                params={
                    "function": "SYMBOL_SEARCH",
                    "keywords": keywords,
                    "apikey": self.api_key
                }
            )
            response.raise_for_status()
            data = response.json()

            matches = data.get("bestMatches", [])
            return [
                {
                    "symbol": m.get("1. symbol"),
                    "name": m.get("2. name"),
                    "type": m.get("3. type"),
                    "region": m.get("4. region"),
                    "currency": m.get("8. currency"),
                }
                for m in matches
            ]

        except httpx.HTTPError as e:
            logger.error(f"Alpha Vantage search failed for '{keywords}': {e}")
            return []