"""Supplemental price feed for HL-native assets not listed on Binance.

Polls HL allMids endpoint every 2 seconds and pumps price_store +
tp_sl_monitor for assets in HL_PRICE_ASSETS. Runs alongside run_binance_ws().

WHY THIS EXISTS:
  tp_sl_monitor.on_price_tick(asset, price) is the sole mechanism that fires
  stop-loss, take-profit, and trailing-stop for live bot trades.
  HL-native assets (HYPE, PURR, …) are not listed on Binance, so the
  Binance WebSocket in binance.py cannot provide their prices.
  Without this feed, any bot trade on an HL-native asset silently loses ALL
  TP/SL protection — only the max_hold asyncio timer remains as an exit.

COVERAGE:
  • Binance WS  → BTC, ETH, SOL, TRUMP, BNB, DOGE, LINK, AAVE  (ASSET_MAP)
  • This feed   → HYPE, PURR  (HL_PRICE_ASSETS)

Adding a new HL-native asset:
  1. Add its symbol (uppercase) to HL_PRICE_ASSETS below.
  2. Verify the symbol appears in HL allMids by running:
       curl -s -X POST https://api.hyperliquid.xyz/info \\
            -H 'Content-Type: application/json' \\
            -d '{"type":"allMids"}' | python3 -m json.tool | grep HYPE
"""

from __future__ import annotations

import asyncio
import logging
import time
from typing import Optional

import httpx

from app.services.price_store import price_store
from app.ws.manager import manager

logger = logging.getLogger(__name__)

HL_API_URL = "https://api.hyperliquid.xyz/info"

# HL-native assets not covered by the Binance WS. Add new ones here as needed.
HL_PRICE_ASSETS: frozenset[str] = frozenset({"HYPE", "PURR"})

# Poll cadence — 2 s gives ~same freshness as a Binance 1-min kline close
# without hammering the free HL REST endpoint (30 req/min well within limit).
_POLL_INTERVAL = 2.0

# Exponential backoff caps: start at 5 s, max at 60 s, reset on clean loop.
_BACKOFF_START = 5
_BACKOFF_MAX   = 60


async def run_hl_price_feed() -> None:
    """Long-running loop. Retries with exponential backoff on connection failure.
    Designed to be created once as an asyncio task at startup and cancelled at
    shutdown — matches the run_binance_ws() lifecycle pattern."""
    logger.info("HL supplemental price feed starting for %s", sorted(HL_PRICE_ASSETS))
    backoff = _BACKOFF_START
    while True:
        try:
            await _poll_loop()
        except asyncio.CancelledError:
            logger.info("HL price feed cancelled — shutting down.")
            return
        except Exception as exc:
            logger.warning(
                "HL price feed outer error: %s — retrying in %ds", exc, backoff
            )
            await asyncio.sleep(backoff)
            backoff = min(backoff * 2, _BACKOFF_MAX)
        else:
            backoff = _BACKOFF_START  # reset on clean exit (shouldn't happen normally)


async def _poll_loop() -> None:
    """Inner loop: tick every 2 s. Individual tick failures are swallowed so
    a transient HTTP 5xx doesn't break the whole loop."""
    while True:
        try:
            await _tick()
        except asyncio.CancelledError:
            raise
        except Exception as exc:
            # Transient: network blip, HL rate limit, malformed JSON.
            logger.debug("HL price tick error (suppressed): %s", exc)
        await asyncio.sleep(_POLL_INTERVAL)


async def _tick() -> None:
    """Single price fetch + dispatch cycle for all HL_PRICE_ASSETS."""
    now_ms = int(time.time() * 1000)

    async with httpx.AsyncClient(timeout=4.0) as c:
        r = await c.post(HL_API_URL, json={"type": "allMids"})
        r.raise_for_status()
        mids: dict = r.json()  # {"BTC": "74541.0", "HYPE": "13.5", …}

    for asset in HL_PRICE_ASSETS:
        raw: Optional[str] = mids.get(asset)
        if raw is None:
            # Asset not listed on HL yet — skip silently.
            continue
        try:
            price = float(raw)
        except (TypeError, ValueError):
            logger.warning("HL price feed: bad value for %s: %r", asset, raw)
            continue
        if price <= 0:
            continue

        # Synthetic 1-minute candle aligned to the current minute bucket.
        # All OHLC set to the mid price (no spread data from allMids).
        # price_store.update() handles the same-bucket replace logic.
        candle = {
            "time":   (now_ms // 60_000) * 60_000,
            "open":   price,
            "high":   price,
            "low":    price,
            "close":  price,
            "volume": 0.0,
        }
        price_store.update(asset, candle)

        # TP/SL + trailing-stop evaluation on every tick.
        from app.services.tp_sl_monitor import on_price_tick
        on_price_tick(asset, price)

        # Price-impact peak tracker for Trump-post windows.
        from app.services.price_impact_monitor import on_price_tick as pi_tick
        pi_tick(asset, price, price, price)

        # Live price broadcast to the frontend dashboard.
        await manager.broadcast({
            "type":  "price",
            "asset": asset,
            "price": price,
            "time":  now_ms,
        })