"""策略结束快照：趋势回调 / 顺势加仓（四所共用）。"""
from __future__ import annotations

import json
from datetime import datetime, timezone
from typing import Any, Callable, Optional

STRATEGY_TREND = "trend_pullback"
STRATEGY_ROLL = "roll"

STRATEGY_SNAPSHOTS_SQL = """
CREATE TABLE IF NOT EXISTS strategy_trade_snapshots (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    strategy_type TEXT NOT NULL,
    source_id INTEGER,
    symbol TEXT,
    exchange_symbol TEXT,
    direction TEXT,
    result_label TEXT,
    status_at_close TEXT,
    opened_at TEXT,
    closed_at TEXT,
    pnl_amount REAL,
    snapshot_json TEXT NOT NULL,
    created_at TEXT
)
"""


def init_strategy_snapshot_table(conn) -> None:
    conn.execute(STRATEGY_SNAPSHOTS_SQL)
    conn.execute(
        "CREATE INDEX IF NOT EXISTS idx_strategy_snapshots_closed "
        "ON strategy_trade_snapshots(closed_at DESC)"
    )
    conn.execute(
        "CREATE INDEX IF NOT EXISTS idx_strategy_snapshots_type "
        "ON strategy_trade_snapshots(strategy_type, source_id)"
    )


def _row_dict(row) -> dict:
    if row is None:
        return {}
    try:
        return dict(row)
    except Exception:
        return {}


def _json_dumps(obj: Any) -> str:
    return json.dumps(obj, ensure_ascii=False, separators=(",", ":"))


def build_trend_dca_levels(plan: dict) -> list[dict]:
    """首仓 + 补仓档位列表（供策略页 / 中控）。"""
    out: list[dict] = []
    p = plan or {}
    try:
        legs_done = int(p.get("legs_done") or 0)
    except (TypeError, ValueError):
        legs_done = 0
    try:
        dca_legs = int(p.get("dca_legs") or 0)
    except (TypeError, ValueError):
        dca_legs = 0
    first_done = int(p.get("first_order_done") or 0) != 0
    try:
        grid = json.loads(p.get("grid_prices_json") or "[]")
        if not isinstance(grid, list):
            grid = []
    except Exception:
        grid = []
    try:
        leg_amounts = json.loads(p.get("leg_amounts_json") or "[]")
        if not isinstance(leg_amounts, list):
            leg_amounts = []
    except Exception:
        leg_amounts = []

    out.append(
        {
            "i": 0,
            "leg_key": "first",
            "label": "首仓",
            "price": None,
            "contracts": p.get("first_order_amount"),
            "status": "done" if first_done else "pending",
            "status_label": "已开仓" if first_done else "待开仓",
        }
    )
    n = max(len(grid), len(leg_amounts), dca_legs)
    for idx in range(n):
        leg_i = idx + 1
        price = grid[idx] if idx < len(grid) else None
        contracts = leg_amounts[idx] if idx < len(leg_amounts) else None
        done = leg_i <= legs_done
        out.append(
            {
                "i": leg_i,
                "leg_key": f"dca_{leg_i}",
                "label": f"补仓{leg_i}",
                "price": price,
                "contracts": contracts,
                "status": "done" if done else "pending",
                "status_label": "已补仓" if done else "待补仓",
            }
        )
    return out


def attach_trend_dca_levels(plan: dict) -> dict:
    d = dict(plan or {})
    d["dca_levels"] = build_trend_dca_levels(d)
    return d


def save_trend_plan_snapshot(
    cfg: dict,
    conn,
    plan_row: Any,
    *,
    result_label: str,
    exit_price: float | None = None,
    pnl_amount: float | None = None,
) -> None:
    init_strategy_snapshot_table(conn)
    row = _row_dict(plan_row)
    plan_id = int(row.get("id") or 0)
    if plan_id <= 0:
        return
    m = cfg.get("app_module")
    closed_at = (
        m.app_now_str()
        if m is not None and hasattr(m, "app_now_str")
        else datetime.now(timezone.utc).strftime("%Y-%m-%d %H:%M:%S")
    )
    payload = attach_trend_dca_levels(row)
    payload["result_label"] = result_label
    payload["exit_price"] = exit_price
    payload["pnl_amount"] = pnl_amount
    payload["status_at_close"] = row.get("status")
    conn.execute(
        """INSERT INTO strategy_trade_snapshots (
            strategy_type, source_id, symbol, exchange_symbol, direction,
            result_label, status_at_close, opened_at, closed_at, pnl_amount, snapshot_json, created_at
        ) VALUES (?,?,?,?,?,?,?,?,?,?,?,?)""",
        (
            STRATEGY_TREND,
            plan_id,
            row.get("symbol"),
            row.get("exchange_symbol"),
            row.get("direction"),
            result_label,
            row.get("status"),
            row.get("opened_at"),
            closed_at,
            pnl_amount,
            _json_dumps(payload),
            closed_at,
        ),
    )


def save_roll_group_snapshot(
    cfg: dict,
    conn,
    group: dict,
    *,
    result_label: str = "结束",
    pnl_amount: float | None = None,
) -> None:
    init_strategy_snapshot_table(conn)
    g = dict(group or {})
    gid = int(g.get("id") or 0)
    if gid <= 0:
        return
    legs = []
    for leg in conn.execute(
        "SELECT * FROM roll_legs WHERE roll_group_id=? ORDER BY leg_index ASC, id ASC",
        (gid,),
    ).fetchall():
        ld = _row_dict(leg)
        try:
            from strategy_roll_monitor_lib import roll_leg_status_label

            ld["status_label"] = roll_leg_status_label(ld.get("status"))
        except Exception:
            ld["status_label"] = ld.get("status") or ""
        legs.append(ld)
    m = cfg.get("app_module")
    closed_at = (
        m.app_now_str()
        if m is not None and hasattr(m, "app_now_str")
        else datetime.now(timezone.utc).strftime("%Y-%m-%d %H:%M:%S")
    )
    payload = {
        "group": g,
        "legs": legs,
        "result_label": result_label,
        "pnl_amount": pnl_amount,
    }
    conn.execute(
        """INSERT INTO strategy_trade_snapshots (
            strategy_type, source_id, symbol, exchange_symbol, direction,
            result_label, status_at_close, opened_at, closed_at, pnl_amount, snapshot_json, created_at
        ) VALUES (?,?,?,?,?,?,?,?,?,?,?,?)""",
        (
            STRATEGY_ROLL,
            gid,
            g.get("symbol"),
            g.get("exchange_symbol"),
            g.get("direction"),
            result_label,
            g.get("status"),
            g.get("created_at"),
            closed_at,
            pnl_amount,
            _json_dumps(payload),
            closed_at,
        ),
    )


def list_strategy_snapshots(conn, *, limit: int = 200) -> list[dict]:
    init_strategy_snapshot_table(conn)
    rows = conn.execute(
        "SELECT * FROM strategy_trade_snapshots ORDER BY id DESC LIMIT ?",
        (max(1, min(int(limit), 500)),),
    ).fetchall()
    out = []
    for r in rows:
        d = _row_dict(r)
        try:
            d["snapshot"] = json.loads(d.get("snapshot_json") or "{}")
        except Exception:
            d["snapshot"] = {}
        st = (d.get("strategy_type") or "").strip()
        d["strategy_label"] = "趋势回调" if st == STRATEGY_TREND else "顺势加仓"
        out.append(d)
    return out