"""
Feature Store — Central registry for computing and caching all features.
Single entry point for the signal engine to get a complete feature set.
"""
import logging
import time

import pandas as pd

from backend.data.market_data import fetch_ohlcv
from backend.features.fundamental import compute_fundamental_features
from backend.features.momentum import compute_momentum_features
from backend.features.technical import compute_technical_features
from backend.features.volatility import compute_volatility_features

logger = logging.getLogger(__name__)


def compute_all_features(ticker: str, period: str = "1y") -> dict:
    """
    Compute ALL features for a single ticker.

    Returns a dict with:
        - 'df': Full feature DataFrame (time series)
        - 'latest': Latest row as a flat dict (for signal engine)
        - 'fundamentals': Fundamental metrics dict
        - 'ticker': The ticker symbol
        - 'computed_at': Timestamp
    """
    start = time.time()
    logger.info(f"{ticker}: Computing all features...")

    # 1. Fetch OHLCV
    ohlcv = fetch_ohlcv(ticker, period=period)
    if ohlcv.empty:
        logger.error(f"{ticker}: No OHLCV data — cannot compute features")
        return {"ticker": ticker, "error": "no_data"}

    # 2. Technical features
    df = compute_technical_features(ohlcv, ticker)

    # 3. Momentum features
    df = compute_momentum_features(df, ticker)

    # 4. Volatility features
    df = compute_volatility_features(df, ticker)

    # 5. Fundamentals (separate — not time-series)
    fundamentals = compute_fundamental_features(ticker)

    # 6. Extract latest row as flat dict
    latest = {}
    if not df.empty:
        last_row = df.iloc[-1]
        for k, v in last_row.items():
            try:
                if pd.notna(v):
                    latest[k] = round(float(v), 4) if isinstance(v, (int, float)) else str(v)
                else:
                    latest[k] = None
            except (TypeError, ValueError):
                latest[k] = str(v) if v is not None else None

    # Add fundamental score to latest
    latest["fundamental_score"] = fundamentals.get("fundamental_score", 50.0)
    latest["sector"] = fundamentals.get("sector", "Unknown")
    latest["industry"] = fundamentals.get("industry", "Unknown")
    latest["market_cap"] = fundamentals.get("market_cap")
    latest["pe_ratio"] = fundamentals.get("pe_ratio")

    elapsed = round(time.time() - start, 2)
    logger.info(f"{ticker}: All features computed in {elapsed}s ({len(df)} rows, {len(df.columns)} cols)")

    return {
        "ticker": ticker,
        "df": df,
        "latest": latest,
        "fundamentals": fundamentals,
        "computed_at": time.time(),
        "elapsed_seconds": elapsed,
    }


def compute_universe_features(tickers: list[str], period: str = "1y") -> list[dict]:
    """
    Compute features for an entire universe of tickers.
    Returns a list of feature dicts (one per ticker).
    """
    results = []
    total = len(tickers)

    for i, ticker in enumerate(tickers):
        try:
            result = compute_all_features(ticker, period)
            if "error" not in result:
                results.append(result)
            else:
                logger.warning(f"{ticker}: Skipped — {result.get('error')}")
        except Exception as e:
            logger.error(f"{ticker}: Feature computation failed: {e}")

        if (i + 1) % 10 == 0:
            logger.info(f"Universe progress: {i + 1}/{total} tickers processed")

    logger.info(f"Universe features complete: {len(results)}/{total} successful")
    return results


def get_cross_sectional_matrix(feature_results: list[dict], columns: list[str] | None = None) -> pd.DataFrame:
    """
    Build a cross-sectional matrix (tickers × features) from computed results.
    Useful for ranking and comparison.
    """
    rows = []
    for result in feature_results:
        latest = result.get("latest", {})
        latest["ticker"] = result["ticker"]
        rows.append(latest)

    df = pd.DataFrame(rows)
    if columns and not df.empty:
        available = [c for c in columns if c in df.columns]
        df = df[["ticker"] + available]

    return df