"""
24 小时行情 WebSocket 流：订阅 !ticker@arr，维护全市场 ticker 缓存。
供 market_scanner 优先使用，避免批量 REST get_all_tickers_24h，减少请求与超时。
文档：仅发生变化的交易对会出现在推送数组中，约 1 秒一次。
"""
import asyncio
import json
import logging
import time
from typing import Dict, Optional, Any

logger = logging.getLogger(__name__)

# 全市场 24h ticker 缓存：symbol -> { symbol, price, volume, changePercent, ts }
_ticker_24h_cache: Dict[str, Dict[str, Any]] = {}
_ticker_24h_updated_at: float = 0.0


def get_tickers_24h_cache() -> Dict[str, Dict[str, Any]]:
    """返回当前 24h ticker 缓存（与 get_all_tickers_24h 结构兼容）。"""
    return dict(_ticker_24h_cache)


def get_tickers_24h_cache_updated_at() -> float:
    """返回缓存最后更新时间（monotonic）。未更新过为 0。"""
    return _ticker_24h_updated_at


def is_ticker_24h_cache_fresh(max_age_sec: float = 120.0) -> bool:
    """缓存是否在 max_age_sec 秒内更新过且非空。"""
    if not _ticker_24h_cache:
        return False
    return (time.monotonic() - _ticker_24h_updated_at) <= max_age_sec


class Ticker24hStream:
    """订阅合约 !ticker@arr，持续更新 _ticker_24h_cache。无需 listenKey，公开行情。"""

    def __init__(self, testnet: bool = False):
        self.testnet = testnet
        self._ws = None
        self._task: Optional[asyncio.Task] = None
        self._running = False

    def _ws_url(self) -> str:
        if self.testnet:
            return "wss://stream.binancefuture.com/ws/!ticker@arr"
        return "wss://fstream.binance.com/ws/!ticker@arr"

    async def start(self) -> bool:
        if self._running:
            return True
        self._running = True
        self._task = asyncio.create_task(self._run_ws())
        logger.info("Ticker24hStream: 已启动（!ticker@arr），扫描将优先使用 WS 缓存")
        return True

    async def stop(self):
        self._running = False
        if self._task:
            self._task.cancel()
            try:
                await self._task
            except asyncio.CancelledError:
                pass
            self._task = None
        if self._ws:
            try:
                await self._ws.close()
            except Exception:
                pass
            self._ws = None
        logger.info("Ticker24hStream: 已停止")

    async def _run_ws(self):
        import aiohttp
        while self._running:
            url = self._ws_url()
            try:
                async with aiohttp.ClientSession() as session:
                    async with session.ws_connect(
                        url, heartbeat=50, timeout=aiohttp.ClientTimeout(total=15)
                    ) as ws:
                        self._ws = ws
                        logger.info("Ticker24hStream: WS 已连接")
                        async for msg in ws:
                            if not self._running:
                                break
                            if msg.type == aiohttp.WSMsgType.TEXT:
                                self._handle_message(msg.data)
                            elif msg.type in (aiohttp.WSMsgType.ERROR, aiohttp.WSMsgType.CLOSED, aiohttp.WSMsgType.CLOSE):
                                break
            except asyncio.CancelledError:
                break
            except Exception as e:
                err_msg = getattr(e, "message", str(e)) or repr(e)
                err_type = type(e).__name__
                logger.warning(
                    "Ticker24hStream: WS 异常 %s: %s，10s 后重连",
                    err_type, err_msg,
                    exc_info=logger.isEnabledFor(logging.DEBUG),
                )
                await asyncio.sleep(10)
            self._ws = None
            if not self._running:
                break

    def _handle_message(self, raw: str):
        global _ticker_24h_cache, _ticker_24h_updated_at
        try:
            data = json.loads(raw)
        except Exception:
            return
        # 可能是单条对象（stream 名）或数组；文档说是数组
        if isinstance(data, list):
            arr = data
        elif isinstance(data, dict):
            # 组合流格式 { "stream": "!ticker@arr", "data": [ ... ] }
            arr = data.get("data") if isinstance(data.get("data"), list) else [data]
        else:
            return
        now_ms = int(time.time() * 1000)
        for t in arr:
            if not isinstance(t, dict):
                continue
            s = (t.get("s") or t.get("symbol") or "").strip()
            if not s or not s.endswith("USDT"):
                continue
            try:
                price = float(t.get("c") or t.get("lastPrice") or 0)
                change_pct = float(t.get("P") or t.get("priceChangePercent") or 0)
                # 成交量：优先 quoteVolume（USDT），文档可能为 q 或 quoteVolume
                vol = float(t.get("quoteVolume") or t.get("q") or t.get("v") or 0)
            except (TypeError, ValueError):
                continue
            _ticker_24h_cache[s] = {
                "symbol": s,
                "price": price,
                "volume": vol,
                "changePercent": change_pct,
                "ts": now_ms,
            }
        _ticker_24h_updated_at = time.monotonic()
        logger.debug(f"Ticker24hStream: 已更新 {len(arr)} 条，缓存共 {len(_ticker_24h_cache)} 个交易对")