"""对冲计划 SQLite 表."""
from __future__ import annotations

import sqlite3
from typing import Any, Optional


def init_hedge_plan_tables(conn: sqlite3.Connection) -> None:
    conn.execute(
        """
        CREATE TABLE IF NOT EXISTS hedge_plans (
            id INTEGER PRIMARY KEY AUTOINCREMENT,
            plan_type TEXT NOT NULL,
            status TEXT NOT NULL,
            underlying TEXT NOT NULL,
            direction TEXT,
            entry_mark REAL,
            tp REAL,
            sl REAL,
            target_price REAL,
            sizing_mode_at_open TEXT,
            perp_size REAL,
            margin REAL,
            leverage REAL,
            premium_total REAL,
            realized_pnl_perp REAL,
            realized_pnl_options REAL,
            realized_pnl_total REAL,
            stats_bucket TEXT,
            close_reason TEXT,
            wechat_start_sent INTEGER DEFAULT 0,
            wechat_end_sent INTEGER DEFAULT 0,
            note TEXT,
            preview_json TEXT,
            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
            opened_at TIMESTAMP,
            closed_at TIMESTAMP
        )
        """
    )
    conn.execute(
        """
        CREATE TABLE IF NOT EXISTS hedge_plan_legs (
            id INTEGER PRIMARY KEY AUTOINCREMENT,
            plan_id INTEGER NOT NULL,
            leg_role TEXT NOT NULL,
            symbol TEXT,
            inst_id TEXT,
            opt_type TEXT,
            strike REAL,
            side TEXT,
            size REAL,
            avg_open REAL,
            premium REAL,
            status TEXT,
            linked_monitor_id INTEGER,
            options_trade_id INTEGER,
            exchange_ord_id TEXT,
            realized_pnl REAL,
            close_reason TEXT,
            opened_at TIMESTAMP,
            closed_at TIMESTAMP,
            FOREIGN KEY(plan_id) REFERENCES hedge_plans(id)
        )
        """
    )
    conn.execute(
        "CREATE INDEX IF NOT EXISTS idx_hedge_plans_status ON hedge_plans(status)"
    )
    conn.execute(
        "CREATE INDEX IF NOT EXISTS idx_hedge_plan_legs_plan ON hedge_plan_legs(plan_id)"
    )
    _ensure_column(conn, "hedge_plans", "target_price_up", "REAL")
    _ensure_column(conn, "hedge_plans", "target_price_down", "REAL")


def _ensure_column(conn: sqlite3.Connection, table: str, col: str, typedef: str) -> None:
    rows = conn.execute(f"PRAGMA table_info({table})").fetchall()
    names: set[str] = set()
    for r in rows:
        try:
            names.add(str(r["name"]))
        except (TypeError, KeyError, IndexError):
            names.add(str(r[1]))
    if col not in names:
        conn.execute(f"ALTER TABLE {table} ADD COLUMN {col} {typedef}")


def count_active_plans(conn: sqlite3.Connection, plan_type: Optional[str] = None) -> int:
    if plan_type:
        row = conn.execute(
            "SELECT COUNT(1) AS c FROM hedge_plans WHERE status IN ('opening','active','partial') AND plan_type=?",
            (plan_type,),
        ).fetchone()
    else:
        row = conn.execute(
            "SELECT COUNT(1) AS c FROM hedge_plans WHERE status IN ('opening','active','partial')"
        ).fetchone()
    return int((row["c"] if row else 0) or 0)


def insert_plan(conn: sqlite3.Connection, row: dict[str, Any]) -> int:
    cols = list(row.keys())
    placeholders = ",".join(["?"] * len(cols))
    conn.execute(
        f"INSERT INTO hedge_plans ({','.join(cols)}) VALUES ({placeholders})",
        [row[c] for c in cols],
    )
    return int(conn.execute("SELECT last_insert_rowid()").fetchone()[0])


def insert_leg(conn: sqlite3.Connection, row: dict[str, Any]) -> int:
    cols = list(row.keys())
    placeholders = ",".join(["?"] * len(cols))
    conn.execute(
        f"INSERT INTO hedge_plan_legs ({','.join(cols)}) VALUES ({placeholders})",
        [row[c] for c in cols],
    )
    return int(conn.execute("SELECT last_insert_rowid()").fetchone()[0])


def update_plan(conn: sqlite3.Connection, plan_id: int, **fields: Any) -> None:
    if not fields:
        return
    sets = ", ".join(f"{k}=?" for k in fields)
    conn.execute(f"UPDATE hedge_plans SET {sets} WHERE id=?", [*fields.values(), plan_id])


def list_plans(
    conn: sqlite3.Connection,
    *,
    status: Optional[str] = None,
    plan_type: Optional[str] = None,
    underlying: Optional[str] = None,
    limit: int = 50,
) -> list[dict[str, Any]]:
    wheres: list[str] = []
    args: list[Any] = []
    if status:
        wheres.append("status=?")
        args.append(status)
    if plan_type:
        wheres.append("plan_type=?")
        args.append(plan_type)
    if underlying:
        wheres.append("underlying=?")
        args.append(underlying)
    where = (" WHERE " + " AND ".join(wheres)) if wheres else ""
    rows = conn.execute(
        f"SELECT * FROM hedge_plans{where} ORDER BY id DESC LIMIT ?",
        [*args, int(limit)],
    ).fetchall()
    return [dict(r) for r in rows]


def get_plan(conn: sqlite3.Connection, plan_id: int) -> Optional[dict[str, Any]]:
    row = conn.execute("SELECT * FROM hedge_plans WHERE id=?", (plan_id,)).fetchone()
    return dict(row) if row else None


def get_plan_legs(conn: sqlite3.Connection, plan_id: int) -> list[dict[str, Any]]:
    rows = conn.execute(
        "SELECT * FROM hedge_plan_legs WHERE plan_id=? ORDER BY id", (plan_id,)
    ).fetchall()
    return [dict(r) for r in rows]


def delete_plan(conn: sqlite3.Connection, plan_id: int) -> dict[str, Any]:
    """删除已结束/失败/取消的计划及其腿;活跃计划拒绝删除."""
    plan = get_plan(conn, int(plan_id))
    if not plan:
        return {"ok": False, "msg": "计划不存在"}
    st = str(plan.get("status") or "")
    if st in ("opening", "active", "partial"):
        return {"ok": False, "msg": "进行中的计划不可删除,请先结束"}
    conn.execute("DELETE FROM hedge_plan_legs WHERE plan_id=?", (int(plan_id),))
    conn.execute("DELETE FROM hedge_plans WHERE id=?", (int(plan_id),))
    return {"ok": True, "deleted_id": int(plan_id)}


def legs_contract_summary(legs: list[dict[str, Any]]) -> str:
    parts: list[str] = []
    for leg in legs:
        role = str(leg.get("leg_role") or "")
        if role == "perp":
            name = str(leg.get("symbol") or "永续")
            parts.append(f"永续 {name}")
        else:
            inst = str(leg.get("inst_id") or "")
            ot = str(leg.get("opt_type") or "").upper()
            strike = leg.get("strike")
            label = inst or (f"{ot}{strike}" if ot or strike is not None else role)
            parts.append(label)
    return " · ".join(parts) if parts else "—"


def attach_legs_to_plans(conn: sqlite3.Connection, plans: list[dict[str, Any]]) -> list[dict[str, Any]]:
    out: list[dict[str, Any]] = []
    for p in plans:
        legs = get_plan_legs(conn, int(p["id"]))
        row = dict(p)
        row["legs"] = legs
        row["contracts_summary"] = legs_contract_summary(legs)
        out.append(row)
    return out


def active_options_targets_by_inst(conn: sqlite3.Connection) -> dict[str, dict[str, Any]]:
    """返回由进行中「期期对冲」托管的期权目标位，仅供期权页只读展示。

    这些目标由 hedge_plan_monitor_lib 执行，绝不能写入 options_target_monitors，
    否则两套监控会同时尝试平掉同一条期权腿。
    """
    rows = conn.execute(
        """
        SELECT p.id AS plan_id, p.underlying, p.target_price_up, p.target_price_down,
               l.inst_id, l.opt_type
        FROM hedge_plans p
        JOIN hedge_plan_legs l ON l.plan_id = p.id
        WHERE p.plan_type = 'options_options'
          AND p.status IN ('opening', 'active', 'partial')
          AND l.status = 'open'
          AND l.inst_id IS NOT NULL
          AND l.inst_id != ''
        ORDER BY p.id DESC, l.id DESC
        """
    ).fetchall()
    out: dict[str, dict[str, Any]] = {}
    for raw in rows:
        row = dict(raw)
        inst_id = str(row.get("inst_id") or "")
        opt_type = str(row.get("opt_type") or "").upper()
        target = row.get("target_price_up") if opt_type == "C" else row.get("target_price_down")
        target_f = _sf(target)
        if not inst_id or target_f is None or target_f <= 0 or inst_id in out:
            continue
        out[inst_id] = {
            "plan_id": int(row["plan_id"]),
            "inst_id": inst_id,
            "underlying": row.get("underlying"),
            "opt_type": opt_type,
            "target_index": target_f,
            "plan_type": "options_options",
            "managed_by": "hedge_plan",
        }
    return out


def _sf(v: Any) -> Optional[float]:
    try:
        if v is None or v == "":
            return None
        return float(v)
    except (TypeError, ValueError):
        return None


def _metrics_from_pnls(rows: list[dict[str, Any]]) -> dict[str, Any]:
    """对一组已结束计划计算胜率/盈亏比/最大盈亏/最大回撤."""
    pnls: list[float] = []
    timed: list[tuple[str, float]] = []
    for r in rows:
        pnl = _sf(r.get("realized_pnl_total"))
        if pnl is None:
            continue
        pnls.append(pnl)
        t = str(r.get("closed_at") or r.get("opened_at") or r.get("created_at") or "")
        timed.append((t, pnl))
    n = len(pnls)
    if n == 0:
        return {
            "count": 0,
            "wins": 0,
            "losses": 0,
            "win_rate": None,
            "net_pnl": 0.0,
            "avg_pnl": None,
            "avg_premium": None,
            "profit_factor": None,
            "max_profit": None,
            "max_loss": None,
            "max_drawdown": None,
        }
    wins = [x for x in pnls if x > 0]
    losses = [x for x in pnls if x < 0]
    gross_win = sum(wins)
    gross_loss = abs(sum(losses))
    if gross_loss > 0:
        profit_factor = round(gross_win / gross_loss, 4)
    elif gross_win > 0:
        profit_factor = None  # 全胜,标无限
    else:
        profit_factor = 0.0

    timed.sort(key=lambda x: x[0] or "")
    cum = 0.0
    peak = 0.0
    mdd = 0.0
    for _, p in timed:
        cum += p
        if cum > peak:
            peak = cum
        dd = peak - cum
        if dd > mdd:
            mdd = dd

    premiums = [_sf(r.get("premium_total")) for r in rows]
    premiums_f = [x for x in premiums if x is not None]
    return {
        "count": n,
        "wins": len(wins),
        "losses": len(losses),
        "win_rate": round(len(wins) / n, 4),
        "net_pnl": round(sum(pnls), 4),
        "avg_pnl": round(sum(pnls) / n, 4),
        "avg_premium": round(sum(premiums_f) / len(premiums_f), 4) if premiums_f else None,
        "profit_factor": profit_factor,
        "profit_factor_infinite": bool(gross_loss <= 0 and gross_win > 0),
        "max_profit": round(max(pnls), 4),
        "max_loss": round(min(pnls), 4),
        "max_drawdown": round(mdd, 4),
    }


def stats_summary(conn: sqlite3.Connection) -> dict[str, Any]:
    reason_rows = conn.execute(
        """
        SELECT plan_type, close_reason, COUNT(1) AS n,
               COALESCE(SUM(realized_pnl_total), 0) AS pnl
        FROM hedge_plans
        WHERE status='closed'
        GROUP BY plan_type, close_reason
        """
    ).fetchall()
    closed_rows = [
        dict(r)
        for r in conn.execute(
            "SELECT * FROM hedge_plans WHERE status='closed' ORDER BY COALESCE(closed_at, opened_at, created_at), id"
        ).fetchall()
    ]
    active = count_active_plans(conn)
    overall = _metrics_from_pnls(closed_rows)
    by_type = {
        "perp_options": _metrics_from_pnls(
            [r for r in closed_rows if r.get("plan_type") == "perp_options"]
        ),
        "options_options": _metrics_from_pnls(
            [r for r in closed_rows if r.get("plan_type") == "options_options"]
        ),
    }
    # 永期止盈/止损分桶
    po = [r for r in closed_rows if r.get("plan_type") == "perp_options"]
    by_type["perp_options"]["buckets"] = {
        "tp": _metrics_from_pnls([r for r in po if r.get("close_reason") == "perp_tp"]),
        "sl": _metrics_from_pnls([r for r in po if r.get("close_reason") == "perp_sl"]),
    }
    oo = [r for r in closed_rows if r.get("plan_type") == "options_options"]
    by_type["options_options"]["buckets"] = {
        "expiry_loss": _metrics_from_pnls(
            [r for r in oo if r.get("close_reason") == "oo_expiry_loss"]
        ),
        "expiry_win": _metrics_from_pnls(
            [r for r in oo if r.get("close_reason") == "oo_expiry_win"]
        ),
    }
    return {
        "active": active,
        "closed_count": overall["count"],
        "closed_pnl_total": overall["net_pnl"],
        "overall": overall,
        "by_type": by_type,
        "by_reason": [dict(r) for r in reason_rows],
    }