"""Telegram alert sender for high-confidence trade cards.

Routing: HF Spaces cannot reach api.telegram.org directly (IP blocked).
Messages are routed via a Cloudflare Worker relay:
  HF Space → CLOUDFLARE_WORKER_URL → api.telegram.org → Telegram

Env vars required (set in HF Spaces Secrets):
  CLOUDFLARE_WORKER_URL — your Worker URL, e.g. https://trade-alert.yourname.workers.dev
  (TELEGRAM_BOT_TOKEN and TELEGRAM_CHAT_ID are set as env vars on the Worker itself, not here)

Dedup design (verified by 7-agent panel):
  - Background loop uses key prefix "bg:"  — 4-hour cooldown
  - Manual /api/scan uses key prefix "manual:" — 60-second cooldown
  - Separate namespaces prevent background loop from suppressing manual scans
  - _sent dict is pruned every background loop cycle to prevent memory leak
"""
from __future__ import annotations
import os
import time
import logging
import aiohttp
from datetime import datetime, timezone

logger = logging.getLogger("telegram_alert")

CLOUDFLARE_WORKER_URL = os.environ.get("CLOUDFLARE_WORKER_URL", "")
# Keep these for backward compat / fallback reference
TELEGRAM_BOT_TOKEN = os.environ.get("TELEGRAM_BOT_TOKEN", "")
TELEGRAM_CHAT_ID   = os.environ.get("TELEGRAM_CHAT_ID", "")

_warned_missing = False

# ── Dedup store ───────────────────────────────────────────────────────────────
# Keys: "bg:SYMBOL_DIRECTION" or "manual:SYMBOL_DIRECTION"
# Values: epoch float of last alert time
_sent: dict[str, float] = {}
BG_DEDUP_WINDOW     = 4 * 3600   # 4 hours for background loop
MANUAL_DEDUP_WINDOW = 60          # 60 seconds for manual scan (prevents rapid-click spam)


def _bg_key(card: dict) -> str:
    return f"bg:{card.get('symbol','')}_{card.get('direction','').upper()}"


def _manual_key(card: dict) -> str:
    return f"manual:{card.get('symbol','')}_{card.get('direction','').upper()}"


def _is_suppressed(card: dict, manual: bool) -> bool:
    key    = _manual_key(card) if manual else _bg_key(card)
    window = MANUAL_DEDUP_WINDOW if manual else BG_DEDUP_WINDOW
    last   = _sent.get(key)
    return last is not None and (time.time() - last) < window


def _mark_sent(card: dict, manual: bool) -> None:
    key = _manual_key(card) if manual else _bg_key(card)
    _sent[key] = time.time()


def prune_sent_cache() -> None:
    """Remove entries older than the background dedup window. Call from alert loop."""
    cutoff = time.time() - BG_DEDUP_WINDOW
    stale  = [k for k, v in _sent.items() if v < cutoff]
    for k in stale:
        del _sent[k]
    if stale:
        logger.debug("Pruned %d stale dedup entries", len(stale))


# ── Helpers ───────────────────────────────────────────────────────────────────

def _fmt_price(p) -> str:
    if p is None:
        return "—"
    p = float(p)
    if p >= 1000:
        return f"{p:,.2f}"
    if p >= 1:
        return f"{p:.4f}"
    return f"{p:.6f}"


def _money(v, decimals: int = 2) -> str:
    if v is None:
        return "—"
    return f"${float(v):,.{decimals}f}"


def _rr(card: dict) -> str:
    try:
        entry  = float(card["close"])
        sl     = float(card["levels"]["sl"])
        tp1    = float(card["levels"]["tp1"])
        risk   = abs(entry - sl)
        reward = abs(tp1 - entry)
        if risk == 0:
            return "—"
        return f"{reward / risk:.1f}R"
    except Exception:
        return "—"


# ── Message builder ───────────────────────────────────────────────────────────

def _tier_line(conf: float) -> str:
    """Confidence tier prefix (Strategy Fix Plan F1a).

    Cosmetic label only — the actual send/no-send decision lives in
    main.py's _passes_alert_gate() (confidence >= 7.0 AND PA grade A/A+,
    changed 13 Jul 2026). This just tells Utkarsh at a glance where in the
    confidence range a delivered alert sits.
    """
    if conf >= 9.0:
        return "💎 <b>TRADE-GRADE</b>"
    if conf >= 8.8:
        return "🔭 <b>WATCH ONLY</b> — below auto-trade bar"
    if conf >= 8.0:
        return "🟡 <b>STRONG</b>"
    return "🟠 <b>WATCH</b>"


def _grade_line(card: dict) -> str:
    """PA confluence grade line — required by the alert gate itself now, so
    surface it on every message (grade is always A or A+ for delivered
    alerts, since B/C/D never pass _passes_alert_gate)."""
    grade = (card.get("price_action") or {}).get("confluence_grade")
    if not grade:
        return ""
    return f"📐 <b>Grade {grade}</b>"


def _momentum_line(card: dict) -> str:
    """Entry-momentum line (Strategy Fix Plan F2b). Empty if data unavailable."""
    mom = card.get("entry_momentum") or {}
    m15v = mom.get("m15_roc_pct")
    if m15v is None:
        return ""
    mark = "✓ aligned" if mom.get("aligned") else "⚠ AGAINST direction"
    sign = "+" if m15v >= 0 else ""
    return f"⚡ Momentum 15m: {sign}{m15v:.2f}% ({mark})"


def _order_flow_line(card: dict) -> str:
    """Format the taker buy/sell ratio line for Telegram. Returns '' if unavailable."""
    taker_ratio = (
        card.get("evidence", {})
            .get("positioning", {})
            .get("taker_ratio")
    )
    if taker_ratio is None:
        return ""
    direction = card.get("direction", "").upper()
    pct = int(round(taker_ratio * 100))
    if taker_ratio > 0.55:
        emoji, label = "🟢", "Buy pressure"
        note = "confirms LONG" if direction == "LONG" else "conflicts SHORT"
    elif taker_ratio < 0.45:
        emoji, label = "🔴", "Sell pressure"
        note = "confirms SHORT" if direction == "SHORT" else "conflicts LONG"
    else:
        emoji, label = "⚪", "Neutral flow"
        note = "no directional bias"
    return (
        f"{emoji} Order flow  "
        f"<b>{label}</b>  "
        f"<code>{taker_ratio:.2f}</code>  "
        f"<i>({note})</i>"
    )


def build_message(card: dict, tv_sym: str) -> str:
    sym       = card.get("symbol", "")
    direction = card.get("direction", "").upper()
    conf      = card.get("confidence", 0)
    lvl       = card.get("levels", {})
    lev       = card.get("leverage", {})
    sz        = card.get("sizing", {})
    dur       = card.get("duration", {})
    hmm       = card.get("market_state", {}).get("hmm", {})

    dir_emoji   = "🟢" if direction == "LONG" else "🔴"
    state       = hmm.get("state", "—")
    hmm_conf    = hmm.get("confidence")
    state_emoji = {"BULL": "🐂", "BEAR": "🐻", "RANGING": "↔️"}.get(state, "❓")

    bingx_url = f"https://bingx.com/en/perpetual/{sym.replace('-', '')}/"
    tv_url    = f"https://www.tradingview.com/chart/?symbol={tv_sym}&interval=15"

    liq_dist = lev.get("liq_dist_pct")
    liq_str  = f"{float(liq_dist):.1f}%" if liq_dist is not None else "—"

    hmm_line = (
        f"{state_emoji} HMM  <b>{state}</b>  ({float(hmm_conf):.0%} conf)"
        if hmm_conf is not None
        else f"{state_emoji} HMM  <b>{state}</b>"
    )
    flow_line = _order_flow_line(card)
    tier_line = _tier_line(float(conf))
    grade_line = _grade_line(card)
    momentum_line = _momentum_line(card)
    tp_dyn = lvl.get("tp_dyn")

    lines = [
        *([tier_line] if tier_line else []),
        f"{dir_emoji} <b>{sym}  {direction}  ·  {conf:.1f}/10</b>",
        *([grade_line] if grade_line else []),
        "",
        f"📍 <b>Entry</b>  <code>{_fmt_price(card.get('close'))}</code>",
        f"🛑 <b>SL</b>     <code>{_fmt_price(lvl.get('sl'))}</code>",
        f"🎯 <b>TP1</b>    <code>{_fmt_price(lvl.get('tp1'))}</code>   R/R {_rr(card)}",
        f"   <b>TP2</b>    <code>{_fmt_price(lvl.get('tp2'))}</code>",
        f"   <b>TP3</b>    <code>{_fmt_price(lvl.get('tp3'))}</code>",
        *([f"   <b>TP-dyn</b> <code>{_fmt_price(tp_dyn)}</code>  (0.7R)"] if tp_dyn is not None else []),
        *([momentum_line] if momentum_line else []),
        "",
        f"⚙️  Leverage  <b>{lev.get('user_leverage', '—')}x</b>   Margin  <b>{_money(lev.get('margin_to_post'))}</b>",
        f"💸 Loss@SL   <b>{_money(lev.get('loss_at_stop'))}</b>   Risk  <b>{_money(sz.get('risk_usd'))}</b>",
        f"💥 Liq dist  <b>{liq_str}</b>",
        f"📦 Notional  <b>{_money(sz.get('notional'), 0)}</b>",
        "",
        hmm_line,
        *([flow_line] if flow_line else []),
        f"⏱  Duration  <b>{dur.get('label', '—')}</b>",
        "",
        f'📊 <a href="{tv_url}">Chart (TradingView)</a>   🔗 <a href="{bingx_url}">BingX</a>',
        f"<i>{datetime.now(timezone.utc).strftime('%H:%M UTC · %d %b')}</i>",
    ]
    return "\n".join(lines)


# ── Public API ────────────────────────────────────────────────────────────────

async def send_alert(card: dict, tv_sym: str, manual: bool = False) -> bool:
    """Send a Telegram alert for one card.

    Args:
        card:   trade card dict from score_symbol()
        tv_sym: TradingView symbol string (e.g. "BINGX:AGLDUSDT.P")
        manual: True when triggered by user's /api/scan click (uses 60s cooldown)
                False when triggered by background loop (uses 4h cooldown)

    Returns True if delivered, False otherwise. Never raises.
    """
    global _warned_missing

    if not CLOUDFLARE_WORKER_URL:
        if not _warned_missing:
            logger.warning(
                "Telegram alerts disabled — set CLOUDFLARE_WORKER_URL in HF Spaces Secrets."
            )
            _warned_missing = True
        return False

    if _is_suppressed(card, manual):
        window = MANUAL_DEDUP_WINDOW if manual else BG_DEDUP_WINDOW
        logger.debug(
            "Dedup hit (%s): %s %s suppressed (window=%ds)",
            "manual" if manual else "bg",
            card.get("symbol"), card.get("direction"), window,
        )
        return False

    if not CLOUDFLARE_WORKER_URL:
        logger.warning("CLOUDFLARE_WORKER_URL not set in HF Secrets — alerts disabled.")
        return False

    text    = build_message(card, tv_sym)
    payload = {"text": text, "parse_mode": "HTML"}

    try:
        async with aiohttp.ClientSession() as session:
            async with session.post(
                CLOUDFLARE_WORKER_URL,
                json=payload,
                timeout=aiohttp.ClientTimeout(total=10)
            ) as resp:
                if resp.status == 200:
                    _mark_sent(card, manual)
                    logger.info(
                        "Telegram alert sent via CF Worker [%s]: %s %s conf=%.1f",
                        "manual" if manual else "bg",
                        card.get("symbol"), card.get("direction"),
                        float(card.get("confidence", 0)),
                    )
                    return True
                body = await resp.text()
                logger.error(
                    "CF Worker error %d for %s: %s",
                    resp.status, card.get("symbol"), body[:300],
                )
    except Exception as exc:
        logger.error(
            "CF Worker request failed for %s: %s",
            card.get("symbol"), exc, exc_info=True,
        )

    return False


async def send_raw_message(text: str) -> bool:
    """Send a plain text/HTML message via the CF Worker relay.

    No dedup, no card parsing — used for heartbeats and system status messages.
    Returns True if delivered, False otherwise. Never raises.
    """
    if not CLOUDFLARE_WORKER_URL:
        return False
    payload = {"text": text, "parse_mode": "HTML"}
    try:
        async with aiohttp.ClientSession() as session:
            async with session.post(
                CLOUDFLARE_WORKER_URL,
                json=payload,
                timeout=aiohttp.ClientTimeout(total=10)
            ) as resp:
                if resp.status == 200:
                    logger.info("Raw message sent via CF Worker")
                    return True
                logger.error("CF Worker raw-message error %d", resp.status)
    except Exception as exc:
        logger.error("CF Worker raw-message failed: %s", exc)
    return False