import math
from fastapi import APIRouter, Query
from services.database import (
    get_portfolio_exposure,
    get_pnl_timeline,
    get_risk_clusters,
    get_pattern_correlations,
    compute_kelly_sizing,
    get_risk_dashboard,
)

router = APIRouter(prefix="/api/risk", tags=["risk"])


def _sanitize(obj):
    """Replace NaN/Inf with None recursively for JSON compliance."""
    if isinstance(obj, dict):
        return {k: _sanitize(v) for k, v in obj.items()}
    if isinstance(obj, list):
        return [_sanitize(v) for v in obj]
    if isinstance(obj, float) and (math.isnan(obj) or math.isinf(obj)):
        return None
    return obj


@router.get("/exposure")
def portfolio_exposure():
    """Exposure by asset class + risk factor for open positions."""
    return get_portfolio_exposure()


@router.get("/timeline")
def pnl_timeline(days: int = Query(default=90, ge=7, le=365)):
    """Daily aggregated P&L timeline for equity curve."""
    return {"timeline": get_pnl_timeline(days=days)}


@router.get("/clusters")
def risk_clusters():
    """Risk factor clustering + saturation detection + prompt context."""
    return get_risk_clusters()


@router.get("/correlations")
def pattern_correlations():
    """Pearson correlation matrix between patterns (mature trades only)."""
    return get_pattern_correlations()


@router.get("/kelly/{pattern_id}")
def kelly_sizing(
    pattern_id: str,
    capital: float = Query(default=10000.0, ge=100, le=10_000_000),
    fractional: float = Query(default=0.33, ge=0.1, le=1.0),
):
    """Fractional Kelly position sizing for a pattern."""
    return compute_kelly_sizing(pattern_id=pattern_id, capital_available=capital, fractional=fractional)


@router.get("/dashboard")
def risk_dashboard():
    """Full portfolio risk snapshot: concentration, diversification, expected drawdown, recommendation."""
    return get_risk_dashboard()


@router.get("/radar")
def risk_radar():
    """5-axis risk radar (Concentration/Volatility/Correlation/Exposure/Drawdown) for the real portfolio."""
    from services.portfolio_risk import compute_real_portfolio_risk_radar
    return _sanitize(compute_real_portfolio_risk_radar())