"""
Impact evaluation service.
Given a market_event (calendar or geopolitical), calls the AI to estimate
instrument-level impacts (score 0-1, direction, rationale, confidence).
Results are persisted in instrument_impacts table.
"""
import json
import logging
import os
from typing import Any, Dict, List, Optional

logger = logging.getLogger(__name__)

ALL_INSTRUMENTS = [
    "SPY","QQQ","IWM","EEM","EFA",
    "GLD","SLV","USO","UNG","TLT",
    "HYG","EURUSD=X","USDJPY=X","GBPUSD=X",
    "VXX","AAPL","NVDA","GS","XOM","BTC-USD",
]

INSTRUMENT_NAMES = {
    "SPY": "S&P 500 ETF", "QQQ": "Nasdaq 100 ETF", "IWM": "Russell 2000 ETF",
    "EEM": "Emerging Markets ETF", "EFA": "MSCI EAFE ETF",
    "GLD": "Gold ETF", "SLV": "Silver ETF", "USO": "WTI Oil ETF",
    "UNG": "Natural Gas ETF", "TLT": "US 20Y Treasury ETF",
    "HYG": "High Yield Credit ETF", "EURUSD=X": "EUR/USD",
    "USDJPY=X": "USD/JPY", "GBPUSD=X": "GBP/USD",
    "VXX": "VIX Tracker", "AAPL": "Apple Inc",
    "NVDA": "NVIDIA Corp", "GS": "Goldman Sachs",
    "XOM": "ExxonMobil", "BTC-USD": "Bitcoin",
}

_INST_LIST_STR = ", ".join(f"{k} ({v})" for k, v in INSTRUMENT_NAMES.items())


def _get_api_key() -> str:
    key = os.environ.get("OPENAI_API_KEY", "")
    if not key:
        from services.database import get_config
        key = get_config("openai_api_key") or ""
    return key


def _build_prompt(event: Dict[str, Any], category_defaults: Optional[List[Dict]] = None) -> str:
    cat_context = ""
    if category_defaults:
        top = sorted(category_defaults, key=lambda x: x.get("sensitivity", 0), reverse=True)[:8]
        lines = [f"  • {d['instrument_id']}: sensibilité {d.get('sensitivity',0):.0%}, direction usuelle = {d.get('typical_direction','?')}" for d in top]
        cat_context = "\nImpacts par défaut de cette catégorie (ajuste si l'événement est atypique) :\n" + "\n".join(lines)

    return f"""Tu es un analyste macro senior spécialisé en options et trading multi-actifs.

ÉVÉNEMENT À ANALYSER :
- Nom : {event.get('name', '')}
- Date : {event.get('start_date', '')}
- Type : {event.get('category', '')} / {event.get('sub_type', '')}
- Description : {event.get('description', '')}
- Impact attendu (résumé) : {event.get('market_impact', '')}
{cat_context}

MISSION :
Évalue l'impact potentiel de cet événement sur chacun des 20 instruments suivants.
Instruments disponibles : {_INST_LIST_STR}

Pour chaque instrument IMPACTÉ (score >= 0.15), retourne :
- instrument_id : identifiant exact (ex: "SPY", "EURUSD=X", "BTC-USD")
- impact_score : 0.0 (aucun) → 1.0 (impact majeur, mouvement > 2%)
- direction : "bullish" | "bearish" | "neutral" | "depends_on_outcome"
- rationale : 1 phrase MAX expliquant le mécanisme
- confidence : 0.0-1.0 (ta certitude sur l'estimation)

Critères de scoring :
- 0.0-0.2 : négligeable (bruit)
- 0.2-0.4 : faible (< 0.5% mouvement)
- 0.4-0.6 : modéré (0.5-1% mouvement)
- 0.6-0.8 : fort (1-2% mouvement)
- 0.8-1.0 : majeur (> 2%, event driver primaire)

FORMAT JSON STRICT (pas de texte hors du JSON) :
{{
  "impacts": [
    {{"instrument_id": "SPY", "impact_score": 0.85, "direction": "bearish", "rationale": "Hausse taux comprime les multiples P/E", "confidence": 0.90}}
  ],
  "summary": "Contexte macro de cet événement en 1 phrase",
  "key_driver": "Instrument le plus impacté et pourquoi"
}}"""


def evaluate_event_impacts(
    event_id: int,
    force: bool = False,
) -> Dict[str, Any]:
    """
    Evaluate instrument impacts for a market_event via AI.
    Saves results to instrument_impacts table.
    Returns the list of impacts + AI summary.
    """
    from services.database import (
        get_all_market_events, get_event_category,
        get_impacts_for_source, delete_impacts_for_source,
        save_instrument_impacts,
    )

    # Fetch event
    events = get_all_market_events()
    event = next((e for e in events if e["id"] == event_id), None)
    if not event:
        return {"error": f"Event {event_id} not found"}

    # Check if already evaluated
    existing = get_impacts_for_source("event", event_id)
    if existing and not force:
        return {
            "event_id": event_id,
            "impacts": existing,
            "summary": "",
            "from_cache": True,
            "n_instruments": len(existing),
        }

    if force and existing:
        delete_impacts_for_source("event", event_id)

    # Get category defaults — try exact name match first, then fuzzy by sub_type/type
    category_defaults = None
    from services.database import get_all_event_categories
    all_cats = get_all_event_categories()

    def _find_cat(candidates):
        for c in candidates:
            if c is None:
                continue
            row = next((x for x in all_cats if x["name"].lower() == c.lower()), None)
            if row:
                try:
                    return json.loads(row.get("default_impacts") or "[]")
                except Exception:
                    pass
        return None

    sub  = (event.get("sub_type") or "").strip()
    cat  = (event.get("category") or "").strip()
    name = (event.get("name") or "").upper()

    # Priority: exact sub_type name → fuzzy keyword in category name → type match
    candidates = [sub]
    for row in all_cats:
        rname = row["name"].upper()
        if sub and sub.upper() in rname:
            candidates.append(row["name"])
        elif any(k in name for k in ["FOMC", "FED"] if k in rname):
            candidates.append(row["name"])
        elif row.get("type") == cat and not sub:
            candidates.append(row["name"])

    category_defaults = _find_cat(candidates)

    api_key = _get_api_key()
    if not api_key:
        return {"error": "No OpenAI API key configured"}

    prompt = _build_prompt(event, category_defaults)

    try:
        from openai import OpenAI
        client = OpenAI(api_key=api_key)
        response = client.chat.completions.create(
            model="gpt-4o-mini",
            messages=[{"role": "user", "content": prompt}],
            response_format={"type": "json_object"},
            temperature=0.25,
            max_tokens=1200,
        )
        raw = json.loads(response.choices[0].message.content)
    except Exception as e:
        logger.error(f"[impact_service] AI call failed for event {event_id}: {e}")
        return {"error": str(e)}

    ai_impacts = raw.get("impacts", [])
    summary = raw.get("summary", "")
    key_driver = raw.get("key_driver", "")

    # Persist
    to_save = []
    for imp in ai_impacts:
        if imp.get("instrument_id") not in ALL_INSTRUMENTS:
            continue
        to_save.append({
            "source_type":   "event",
            "source_id":     event_id,
            "source_name":   event["name"],
            "source_date":   event["start_date"],
            "category_name": cat_name,
            "instrument_id": imp["instrument_id"],
            "impact_score":  float(imp.get("impact_score", 0.5)),
            "direction":     imp.get("direction", "neutral"),
            "rationale":     imp.get("rationale", ""),
            "confidence":    float(imp.get("confidence", 0.7)),
            "ai_generated":  1,
        })

    save_instrument_impacts(to_save)
    saved = get_impacts_for_source("event", event_id)

    return {
        "event_id":     event_id,
        "event_name":   event["name"],
        "impacts":      saved,
        "summary":      summary,
        "key_driver":   key_driver,
        "n_instruments": len(saved),
        "from_cache":   False,
    }


def get_impact_monitor_data(days: int = 7, min_score: float = 0.3) -> Dict[str, Any]:
    """
    Return all evaluated sources (events + news) from the last N days,
    filtered by min_score, with their instrument impacts.
    Also includes unevaluated events for quick launch.
    """
    from services.database import (
        get_weekly_impact_sources, get_all_market_events,
        get_impacts_for_source,
    )
    from datetime import datetime, timedelta

    cutoff = (datetime.utcnow() - timedelta(days=days)).strftime("%Y-%m-%d")

    # Evaluated sources
    evaluated = get_weekly_impact_sources(days=days, min_score=min_score)

    # All recent events not yet evaluated
    all_events = get_all_market_events()
    evaluated_ids = {(s["source_type"], s.get("source_id")) for s in evaluated}

    unevaluated = []
    for ev in all_events:
        if ev.get("start_date", "") < cutoff:
            continue
        if ("event", ev["id"]) not in evaluated_ids:
            unevaluated.append({
                "id": ev["id"],
                "name": ev["name"],
                "start_date": ev["start_date"],
                "category": ev.get("category",""),
                "sub_type": ev.get("sub_type",""),
                "impact_score": ev.get("impact_score", 0.5),
            })

    # Top impacted instruments this period
    from collections import defaultdict
    inst_scores: Dict[str, List[float]] = defaultdict(list)
    for source in evaluated:
        for imp in source.get("impacts", []):
            score = imp.get("adjusted_score") or imp.get("impact_score", 0)
            if score >= min_score:
                inst_scores[imp["instrument_id"]].append(score)

    top_instruments = sorted(
        [{"instrument_id": k, "avg_score": sum(v)/len(v), "n_events": len(v)}
         for k, v in inst_scores.items()],
        key=lambda x: x["avg_score"] * x["n_events"], reverse=True
    )[:10]

    return {
        "evaluated": evaluated,
        "unevaluated": sorted(unevaluated, key=lambda x: x["start_date"], reverse=True),
        "top_instruments": top_instruments,
        "period_days": days,
        "min_score": min_score,
    }