"""Market data utilities."""

from __future__ import annotations

import logging
import time

import pyupbit
import requests

logger = logging.getLogger(__name__)

TOP_N = 20  # 거래량 상위 N개 종목만 스캔
_TICKER_URL = "https://api.upbit.com/v1/ticker"

# 티커 목록 캐시 (5분 TTL — API rate limit 방지)
_ticker_cache: list[str] = []
_ticker_cache_time: float = 0.0
_TICKER_CACHE_TTL = 300  # 5분


def get_top_tickers() -> list[str]:
    """24시간 거래대금 상위 KRW 마켓 티커 반환 (5분 캐시)."""
    global _ticker_cache, _ticker_cache_time
    if _ticker_cache and (time.time() - _ticker_cache_time) < _TICKER_CACHE_TTL:
        return _ticker_cache
    try:
        all_tickers = pyupbit.get_tickers(fiat="KRW")
        if not all_tickers:
            return []

        # 100개씩 나눠서 조회 (URL 길이 제한)
        chunk_size = 100
        ticker_data = []
        for i in range(0, len(all_tickers), chunk_size):
            chunk = all_tickers[i:i + chunk_size]
            params = {"markets": ",".join(chunk)}
            resp = requests.get(_TICKER_URL, params=params, timeout=5)
            resp.raise_for_status()
            ticker_data.extend(resp.json())

        # 스테이블코인 제외
        EXCLUDE = {"KRW-USDT", "KRW-USDC", "KRW-DAI", "KRW-BUSD"}
        ticker_data = [t for t in ticker_data if t["market"] not in EXCLUDE]

        # 24h 거래대금 기준 정렬
        ticker_data.sort(key=lambda x: x.get("acc_trade_price_24h", 0), reverse=True)
        top = [t["market"] for t in ticker_data[:TOP_N]]
        _ticker_cache = top
        _ticker_cache_time = time.time()
        logger.debug(f"상위 {TOP_N}개: {top[:5]}...")
        return top
    except Exception as e:
        logger.error(f"get_top_tickers 실패: {e}")
        return _ticker_cache  # 실패 시 이전 캐시 반환


def get_ohlcv(ticker: str, count: int = 21):
    """일봉 OHLCV 데이터 반환."""
    try:
        return pyupbit.get_ohlcv(ticker, interval="day", count=count)
    except Exception as e:
        logger.error(f"get_ohlcv({ticker}) 실패: {e}")
        return None


def get_current_price(ticker: str) -> float | None:
    """현재가 반환."""
    try:
        return pyupbit.get_current_price(ticker)
    except Exception as e:
        logger.error(f"get_current_price({ticker}) 실패: {e}")
        return None