from __future__ import annotations

import os
import re
import xml.etree.ElementTree as ET
from typing import Any

import httpx

CRYPTOPANIC_URL = "https://cryptopanic.com/api/v1/posts/"
ALTERNATIVE_ME_URL = "https://api.alternative.me/fng/"
COINDESK_RSS = "https://www.coindesk.com/arc/outboundfeeds/rss/"
LUNARCRUSH_COIN_URL = "https://lunarcrush.com/api4/public/coins/{symbol}/v1"
CRYPTOCOMPARE_NEWS_URL = "https://min-api.cryptocompare.com/data/v2/news/"
MESSARI_NEWS_URL = "https://data.messari.io/api/v1/news"


async def _fetch_coindesk_headlines(limit: int = 20) -> list[dict[str, Any]]:
    items: list[dict[str, Any]] = []
    try:
        async with httpx.AsyncClient(timeout=10, follow_redirects=True) as client:
            resp = await client.get(COINDESK_RSS)
        if resp.status_code != 200:
            return items
        root = ET.fromstring(resp.text)
        for node in root.findall(".//item")[:limit]:
            items.append(
                {
                    "title": node.findtext("title", ""),
                    "source": "CoinDesk",
                    "published_at": node.findtext("pubDate", ""),
                    "url": node.findtext("link", ""),
                }
            )
    except Exception:
        pass
    return items

WORLD_NEWS_FEEDS = [
    ("Reuters Business", "https://feeds.reuters.com/reuters/businessNews"),
    ("CNBC Top News", "https://search.cnbc.com/rs/search/combinedcms/view.xml?partnerId=wrss01&id=100003114"),
    ("Bloomberg Markets", "https://feeds.bloomberg.com/markets/news.rss"),
    ("CoinDesk", "https://www.coindesk.com/arc/outboundfeeds/rss/"),
]

# Public funding rate endpoints (no auth required)
BINANCE_FUNDING_URL = "https://fapi.binance.com/fapi/v1/premiumIndex"
BYBIT_FUNDING_URL = "https://api.bybit.com/v5/market/tickers"
OKX_FUNDING_URL = "https://www.okx.com/api/v5/public/funding-rate"
BINANCE_OI_HIST_URL = "https://fapi.binance.com/futures/data/openInterestHist"


async def _fetch_cryptocompare_news(limit: int = 20) -> list[dict[str, Any]]:
    """CER-017: CryptoCompare news free (no key needed)."""
    items: list[dict[str, Any]] = []
    try:
        async with httpx.AsyncClient(timeout=10) as client:
            resp = await client.get(CRYPTOCOMPARE_NEWS_URL, params={"lang": "EN"})
        if resp.status_code != 200:
            return items
        data = resp.json()
        for r in (data.get("Data") or [])[:limit]:
            ts = r.get("published_on")
            try:
                import datetime as _dt
                pub = _dt.datetime.fromtimestamp(int(ts), _dt.UTC).isoformat() if ts else ""
            except (TypeError, ValueError):
                pub = ""
            items.append({
                "title": r.get("title", ""),
                "source": r.get("source", "CryptoCompare"),
                "published_at": pub,
                "url": r.get("url", ""),
                "provider": "cryptocompare",
            })
    except Exception:
        pass
    return items


async def _fetch_messari_news(limit: int = 20) -> list[dict[str, Any]]:
    """CER-017: Messari news free (no key needed for basic feed)."""
    items: list[dict[str, Any]] = []
    try:
        async with httpx.AsyncClient(timeout=10) as client:
            resp = await client.get(MESSARI_NEWS_URL)
        if resp.status_code != 200:
            return items
        data = resp.json()
        for r in (data.get("data") or [])[:limit]:
            items.append({
                "title": r.get("title", ""),
                "source": (r.get("author") or {}).get("name") or "Messari",
                "published_at": r.get("published_at", ""),
                "url": r.get("url", ""),
                "provider": "messari",
            })
    except Exception:
        pass
    return items


def _normalize_title(t: str) -> str:
    """Lowercase + strip non-alnum per dedup tra provider."""
    return "".join(ch for ch in t.lower() if ch.isalnum() or ch.isspace()).strip()


async def fetch_crypto_news(api_key: str = "", limit: int = 20) -> dict[str, Any]:
    """CER-017: multi-source aggregator (CoinDesk + CryptoCompare + Messari) + dedup.

    Se `api_key` Cryptopanic presente, include anche quella come 4° source.
    """
    import asyncio

    # CoinDesk + CryptoCompare + Messari sempre (free, no key)
    tasks = [
        _fetch_coindesk_headlines(limit),
        _fetch_cryptocompare_news(limit),
        _fetch_messari_news(limit),
    ]
    include_cp = bool(api_key) and api_key.lower() not in ("placeholder", "none", "changeme")
    if include_cp:
        tasks.append(_fetch_cryptopanic_news(api_key, limit))

    results = await asyncio.gather(*tasks, return_exceptions=True)
    all_items: list[dict[str, Any]] = []
    providers_ok: list[str] = []
    providers_failed: list[str] = []
    provider_names = ["coindesk", "cryptocompare", "messari"]
    if include_cp:
        provider_names.append("cryptopanic")
    for name, res in zip(provider_names, results, strict=True):
        if isinstance(res, Exception) or not res:
            providers_failed.append(name)
            continue
        providers_ok.append(name)
        for item in res:
            if "provider" not in item:
                item["provider"] = name
            all_items.append(item)

    # Dedup per normalized title — preserva primo match
    seen: set[str] = set()
    deduped: list[dict[str, Any]] = []
    for h in all_items:
        key = _normalize_title(h.get("title", ""))
        if not key or key in seen:
            continue
        seen.add(key)
        deduped.append(h)

    # Sort per published_at DESC (stringhe ISO confrontabili; quelle vuote in fondo)
    deduped.sort(key=lambda x: x.get("published_at") or "", reverse=True)

    return {
        "headlines": deduped[:limit],
        "sources": providers_ok,
        "sources_failed": providers_failed,
        "total_before_dedup": len(all_items),
        "total_after_dedup": len(deduped),
    }


async def _fetch_cryptopanic_news(api_key: str, limit: int) -> list[dict[str, Any]]:
    """Cryptopanic as one of the sources. Failure → []."""
    try:
        async with httpx.AsyncClient(timeout=10) as client:
            resp = await client.get(
                CRYPTOPANIC_URL,
                params={"auth_token": api_key, "public": "true"},
            )
        if resp.status_code >= 400:
            return []
        data = resp.json()
    except Exception:
        return []
    return [
        {
            "title": r.get("title", ""),
            "source": (r.get("source") or {}).get("title", "Cryptopanic"),
            "published_at": r.get("published_at", ""),
            "url": r.get("url", ""),
            "provider": "cryptopanic",
        }
        for r in (data.get("results") or [])[:limit]
    ]


async def _fetch_lunarcrush(symbol: str, api_key: str) -> dict | None:
    """CER-P2-005: LunarCrush v4 social metrics. Ritorna None se fail."""
    try:
        async with httpx.AsyncClient(timeout=10) as client:
            resp = await client.get(
                LUNARCRUSH_COIN_URL.format(symbol=symbol.upper()),
                headers={"Authorization": f"Bearer {api_key}"},
            )
        if resp.status_code != 200:
            return None
        data = (resp.json() or {}).get("data") or {}
        return {
            "galaxy_score": data.get("galaxy_score"),
            "alt_rank": data.get("alt_rank"),
            "sentiment": data.get("sentiment"),  # 0-100 scale
            "social_volume_24h": data.get("social_volume_24h"),
            "social_dominance": data.get("social_dominance"),
        }
    except Exception:
        return None


def _fng_to_sentiment(value: int) -> float:
    """Normalize fear&greed 0-100 to [-1, 1] proxy sentiment."""
    return round((value - 50) / 50.0, 3)


async def fetch_social_sentiment(symbol: str = "BTC") -> dict[str, Any]:
    """CER-P2-005: provider chain LunarCrush + fear_greed proxy.

    Se LUNARCRUSH_API_KEY env è presente e risponde, usa valori reali.
    Altrimenti deriva proxy da fear_greed per popolare twitter/reddit sentiment
    (marcato come derived=True così l'agent sa che è proxy).
    """
    async with httpx.AsyncClient(timeout=10) as client:
        fng_resp = await client.get(ALTERNATIVE_ME_URL, params={"limit": 1})
        fng_data = fng_resp.json()
    fng_list = fng_data.get("data", [])
    fng = fng_list[0] if fng_list else {}
    fng_value = int(fng.get("value", 0))
    proxy = _fng_to_sentiment(fng_value) if fng_value else 0.0

    result: dict[str, Any] = {
        "fear_greed_index": fng_value,
        "fear_greed_label": fng.get("value_classification", ""),
        "symbol": symbol.upper(),
        "social_volume": 0,
        "twitter_sentiment": 0.0,
        "reddit_sentiment": 0.0,
        "source": "fear_greed_only",
        "derived": True,
    }

    lc_key = os.environ.get("LUNARCRUSH_API_KEY", "").strip()
    if lc_key:
        lc = await _fetch_lunarcrush(symbol, lc_key)
        if lc is not None:
            # LunarCrush sentiment 0-100 → normalize to [-1, 1]
            lc_sent = lc.get("sentiment")
            norm = round((float(lc_sent) - 50) / 50.0, 3) if lc_sent is not None else None
            result.update({
                "twitter_sentiment": norm if norm is not None else proxy,
                "reddit_sentiment": norm if norm is not None else proxy,
                "social_volume": int(lc.get("social_volume_24h") or 0),
                "galaxy_score": lc.get("galaxy_score"),
                "alt_rank": lc.get("alt_rank"),
                "social_dominance": lc.get("social_dominance"),
                "source": "lunarcrush+fear_greed",
                "derived": False,
            })
            return result

    # Proxy-only path
    result["twitter_sentiment"] = proxy
    result["reddit_sentiment"] = proxy
    result["note"] = (
        "twitter/reddit derived from fear_greed_index; configure LUNARCRUSH_API_KEY "
        "for real social metrics"
    )
    return result


async def fetch_funding_rates(asset: str = "BTC") -> dict[str, Any]:
    """Fetch perpetual funding rates from Binance, Bybit and OKX public APIs."""
    asset = asset.upper()
    usdt_symbol = f"{asset}USDT"
    okx_inst = f"{asset}-USDT-SWAP"
    rates: list[dict[str, Any]] = []

    async with httpx.AsyncClient(timeout=10) as client:
        # Binance
        try:
            resp = await client.get(BINANCE_FUNDING_URL, params={"symbol": usdt_symbol})
            if resp.status_code == 200:
                d = resp.json()
                rates.append(
                    {
                        "exchange": "binance",
                        "asset": asset,
                        "rate": float(d.get("lastFundingRate", 0)),
                        "next_funding_time": d.get("nextFundingTime", ""),
                    }
                )
        except Exception:
            pass

        # Bybit
        try:
            resp = await client.get(
                BYBIT_FUNDING_URL,
                params={"category": "linear", "symbol": usdt_symbol},
            )
            if resp.status_code == 200:
                items = resp.json().get("result", {}).get("list", [])
                if items:
                    d = items[0]
                    rates.append(
                        {
                            "exchange": "bybit",
                            "asset": asset,
                            "rate": float(d.get("fundingRate", 0)),
                            "next_funding_time": d.get("nextFundingTime", ""),
                        }
                    )
        except Exception:
            pass

        # OKX
        try:
            resp = await client.get(OKX_FUNDING_URL, params={"instId": okx_inst})
            if resp.status_code == 200:
                items = resp.json().get("data", [])
                if items:
                    d = items[0]
                    rates.append(
                        {
                            "exchange": "okx",
                            "asset": asset,
                            "rate": float(d.get("fundingRate", 0)),
                            "next_funding_time": d.get("nextFundingTime", ""),
                        }
                    )
        except Exception:
            pass

    return {"asset": asset, "rates": rates}


async def fetch_cross_exchange_funding(assets: list[str] | None = None) -> dict[str, Any]:
    """Snapshot multi-asset funding rates con spread e arbitrage detection."""
    from datetime import UTC, datetime as _dt

    assets = [a.upper() for a in (assets or ["BTC", "ETH", "SOL"])]
    snapshot: dict[str, dict[str, Any]] = {}
    async with httpx.AsyncClient(timeout=10) as client:
        for asset in assets:
            rates: dict[str, float | None] = {
                "binance": None,
                "bybit": None,
                "okx": None,
                "hyperliquid": None,
            }
            try:
                resp = await client.get(
                    BINANCE_FUNDING_URL, params={"symbol": f"{asset}USDT"}
                )
                if resp.status_code == 200:
                    rates["binance"] = float(resp.json().get("lastFundingRate", 0))
            except Exception:
                pass
            try:
                resp = await client.get(
                    BYBIT_FUNDING_URL,
                    params={"category": "linear", "symbol": f"{asset}USDT"},
                )
                if resp.status_code == 200:
                    items = resp.json().get("result", {}).get("list", [])
                    if items:
                        rates["bybit"] = float(items[0].get("fundingRate", 0))
            except Exception:
                pass
            try:
                resp = await client.get(
                    OKX_FUNDING_URL, params={"instId": f"{asset}-USDT-SWAP"}
                )
                if resp.status_code == 200:
                    items = resp.json().get("data", [])
                    if items:
                        rates["okx"] = float(items[0].get("fundingRate", 0))
            except Exception:
                pass
            try:
                resp = await client.post(
                    "https://api.hyperliquid.xyz/info",
                    json={"type": "metaAndAssetCtxs"},
                )
                if resp.status_code == 200:
                    data = resp.json()
                    universe = data[0].get("universe") or []
                    ctx_list = data[1] if len(data) > 1 else []
                    for meta, ctx in zip(universe, ctx_list, strict=False):
                        if meta.get("name", "").upper() == asset:
                            rates["hyperliquid"] = float(ctx.get("funding", 0))
                            break
            except Exception:
                pass

            present = [v for v in rates.values() if v is not None]
            spread_max_min = max(present) - min(present) if present else None
            anomaly = None
            if present and spread_max_min is not None:
                mean_r = sum(present) / len(present)
                for name, v in rates.items():
                    if v is None:
                        continue
                    if abs(v - mean_r) > 2 * (spread_max_min / 2 or 1e-9):
                        anomaly = f"{name}_outlier"
                        break

            snapshot[asset] = {
                **rates,
                "spread_max_min": spread_max_min,
                "anomaly": anomaly,
            }

    # Arbitrage opportunities
    arbs = []
    for asset, data in snapshot.items():
        values = [(k, v) for k, v in data.items() if k in ("binance", "bybit", "okx", "hyperliquid") and v is not None]
        if len(values) < 2:
            continue
        values.sort(key=lambda x: x[1])
        low_ex, low_v = values[0]
        high_ex, high_v = values[-1]
        diff = high_v - low_v
        ann_pct = diff * 24 * 365 * 100  # hourly funding → annual pct
        if ann_pct > 50:
            arbs.append({
                "asset": asset,
                "pair": f"long_{low_ex}_short_{high_ex}",
                "funding_differential_ann": round(ann_pct, 2),
                "risk_adjusted": "acceptable" if ann_pct > 100 else "marginal",
            })

    return {
        "assets": assets,
        "snapshot": snapshot,
        "arbitrage_opportunities": arbs,
        "data_timestamp": _dt.now(UTC).isoformat(),
    }


async def fetch_world_news() -> dict[str, Any]:
    """Fetch world financial news from free RSS feeds."""
    articles: list[dict[str, Any]] = []

    async with httpx.AsyncClient(timeout=10, follow_redirects=True) as client:
        for source_name, url in WORLD_NEWS_FEEDS:
            try:
                resp = await client.get(url)
                if resp.status_code != 200:
                    continue
                root = ET.fromstring(resp.text)
                for item in root.findall(".//item")[:5]:
                    title = item.findtext("title", "")
                    link = item.findtext("link", "")
                    pub_date = item.findtext("pubDate", "")
                    description = item.findtext("description", "")
                    if "<" in description:
                        description = re.sub(r"<[^>]+>", "", description).strip()
                    articles.append(
                        {
                            "source": source_name,
                            "title": title,
                            "url": link,
                            "published": pub_date,
                            "summary": description[:200] if description else "",
                        }
                    )
            except Exception:
                continue

    return {"articles": articles, "count": len(articles)}


async def fetch_oi_history(asset: str = "BTC", period: str = "5m", limit: int = 288) -> dict[str, Any]:
    """Open interest history perpetual da Binance futures (public).

    period: 5m|15m|30m|1h|2h|4h|6h|12h|1d (Binance API).
    limit: 1..500, default 288 = 24h a 5min.
    """
    asset = asset.upper()
    symbol = f"{asset}USDT"
    limit = max(1, min(int(limit), 500))
    points: list[dict[str, Any]] = []
    try:
        async with httpx.AsyncClient(timeout=10) as client:
            resp = await client.get(
                BINANCE_OI_HIST_URL,
                params={"symbol": symbol, "period": period, "limit": limit},
            )
            if resp.status_code == 200:
                for row in resp.json() or []:
                    points.append(
                        {
                            "timestamp": int(row.get("timestamp", 0)),
                            "oi": float(row.get("sumOpenInterest", 0)),
                            "oi_value_usd": float(row.get("sumOpenInterestValue", 0)),
                        }
                    )
    except Exception:
        pass

    def _delta_pct(points: list[dict[str, Any]], minutes_back: int) -> float | None:
        if len(points) < 2:
            return None
        current = points[-1]
        cutoff_ts = current["timestamp"] - minutes_back * 60 * 1000
        past = next((p for p in reversed(points) if p["timestamp"] <= cutoff_ts), None)
        if past is None or past["oi"] == 0:
            return None
        return round(100.0 * (current["oi"] - past["oi"]) / past["oi"], 3)

    return {
        "asset": asset,
        "exchange": "binance",
        "symbol": symbol,
        "period": period,
        "points": points,
        "current_oi": points[-1]["oi"] if points else None,
        "current_oi_value_usd": points[-1]["oi_value_usd"] if points else None,
        "delta_pct_1h": _delta_pct(points, 60),
        "delta_pct_4h": _delta_pct(points, 240),
        "delta_pct_24h": _delta_pct(points, 1440),
        "data_points": len(points),
    }