"""
CoinGecko client (public free endpoints) to fetch BTC/ETH prices for plotting.

Rules:
- No synthetic data. Return empty structures or None when unavailable.
- Use shared RateLimiter for polite access and retries.
- Default to public endpoints that do not require API key; if a key is provided via env, include it.
"""

from __future__ import annotations

import logging
import os
from typing import Any, Dict, List, Optional, Tuple

from .api_rate_limiter import get_rate_limiter


logger = logging.getLogger(__name__)


class CoinGeckoClient:
    def __init__(self,
                 api_base_url: str = "https://api.coingecko.com/api/v3",
                 api_key_env: str = "COINGECKO_API_KEY",
                 user_agent: str = "gogo2-dashboard/1.0") -> None:
        self.api_base_url = api_base_url.rstrip("/")
        self.api_key = os.environ.get(api_key_env) or ""
        self.user_agent = user_agent
        self._rl = get_rate_limiter()

    def get_simple_price(self, ids: List[str], vs_currency: str = "usd") -> Dict[str, Any]:
        if not ids:
            return {}
        url = f"{self.api_base_url}/simple/price"
        params = {
            "ids": ",".join(ids),
            "vs_currencies": vs_currency,
        }
        headers = {"User-Agent": self.user_agent}
        # Optional key
        if self.api_key:
            params["x_cg_pro_api_key"] = self.api_key
        resp = self._rl.make_request("coingecko_api", url, method="GET", params=params, headers=headers)
        if resp is None:
            return {}
        try:
            return resp.json()  # type: ignore
        except Exception as ex:
            logger.error("CoinGecko simple price JSON error: %s", ex)
            return {}

    def get_market_chart(self, coin_id: str, vs_currency: str = "usd", days: int = 5, interval: str = "hourly") -> Dict[str, Any]:
        if not coin_id:
            return {}
        url = f"{self.api_base_url}/coins/{coin_id}/market_chart"
        params = {
            "vs_currency": vs_currency,
            "days": str(max(1, int(days))),
            "interval": interval,
        }
        headers = {"User-Agent": self.user_agent}
        if self.api_key:
            params["x_cg_pro_api_key"] = self.api_key
        resp = self._rl.make_request("coingecko_api", url, method="GET", params=params, headers=headers)
        if resp is None:
            return {}
        try:
            return resp.json()  # type: ignore
        except Exception as ex:
            logger.error("CoinGecko market_chart JSON error: %s", ex)
            return {}