from __future__ import annotations

from typing import Annotated

from fastapi import APIRouter, Depends

from ..config import get_settings
from ..models.db import get_db
from ..sim.pnl import summarize_fills_pnl
from .auth import require_user

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


@router.get("/summary")
async def stats_summary(_user: Annotated[str, Depends(require_user)]) -> dict:
    db = get_db()
    s = get_settings()
    mode = "LIVE" if not s.is_sim else "SIM"
    rows = db.fetchall("SELECT * FROM groups WHERE status='closed'")
    n = len(rows)
    wins = sum(1 for r in rows if float(r["realized_pnl"] or 0) > 0)
    total_pnl = sum(float(r["realized_pnl"] or 0) for r in rows)

    fees_perp = 0.0
    fees_option = 0.0
    total_slip = 0.0
    for r in rows:
        fills = db.fetchall(
            "SELECT * FROM fills WHERE group_id=? ORDER BY id ASC",
            (r["group_id"],),
        )
        summary = summarize_fills_pnl(list(fills))
        fees_perp += float(summary.get("fees_perp") or 0)
        fees_option += float(summary.get("fees_option") or 0)
        # LIVE 不展示、不计入滑点；按组成交模式判断（可混有历史 SIM 组）
        exec_mode = str(r["exec_mode"] or mode).upper()
        if exec_mode != "LIVE":
            total_slip += float(summary.get("slip_total") or 0)

    total_fees = fees_perp + fees_option
    reasons: dict[str, int] = {}
    for r in rows:
        k = str(r["close_reason"] or "unknown")
        reasons[k] = reasons.get(k, 0) + 1
    curve = [
        {
            "group_id": r["group_id"],
            "realized_pnl": float(r["realized_pnl"] or 0),
            "close_at_ms": r["close_at_ms"],
        }
        for r in sorted(rows, key=lambda x: int(x["close_at_ms"] or 0))
    ]
    return {
        "mode": mode,
        "show_slip": mode == "SIM",
        "groups": n,
        "wins": wins,
        "win_rate": (wins / n) if n else 0.0,
        "total_pnl": total_pnl,
        "fees_perp": fees_perp,
        "fees_option": fees_option,
        "total_fees": total_fees,
        "total_slip": total_slip if mode == "SIM" else 0.0,
        "close_reasons": reasons,
        "equity_curve": curve,
    }