# -*- coding: utf-8 -*-
"""
清空 PMS 账本并把回放游标对齐到当前 (影子运行期的重来一次)
===========================================================
运行:
  docker compose run --rm pms-web python scripts/reset_ledger.py          # 演练, 只统计不删
  docker compose run --rm pms-web python scripts/reset_ledger.py --yes    # 实际执行
  docker compose run --rm pms-web python scripts/reset_ledger.py --yes --keep-commands

什么时候用
----------
账本被脏数据污染、需要从干净起点重来时。典型场景就是 2026-07-29 那次: 首次启动时回放游标
为空, `replay_fills` 从 `trading_order` 表头开始扫, 把旧系统多年的历史成交**全部**当成
「外部成交」并入 BASE 批次 —— 账本上凭空长出一堆早已清掉的持仓, 摊薄成本与安全垫全错。
(该 bug 已修: 游标为空时只对齐不追认, 见 ledger_service._seed_cursor。)

**只动 PMS 自有表, 绝不碰下游的 trading_*** —— 那三张表归下游系统维护, PMS 只读。

清完之后账本是空的, 而真实持仓在 QMT 那边。要让账本反映真实持仓, 有两条路:
  * 让日终对账把下游持仓补进来 (以下游为准, 会生成 RECON 批次), 或
  * 在页面用建仓命令把已有持仓登记成 BASE 批次
影子运行期一般选前者: 跑一次 `POST /api/ops/reconcile?apply_fix=true`。
"""
import argparse
import os
import sys

sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))

# 账本类表 —— 会被清空
LEDGER_TABLES = ["pms_lot", "pms_position", "pms_instruction", "pms_action_ledger",
                 "pms_qmt_order", "pms_qmt_inbox"]
# 命令与方案 —— 默认也清 (方案指向的指令都没了, 留着只会是孤儿); --keep-commands 可保留
COMMAND_TABLES = ["pms_plan", "pms_command", "pms_proposal"]
# 绝不碰: 下游三表 / 行业映射 / 参数表 / 日报
NEVER_TOUCH = ["trading_order", "trading_position", "trading_buy_plan",
               "pms_industry_map", "pms_runtime_param", "pms_daily_report"]


def main():
    ap = argparse.ArgumentParser()
    ap.add_argument("--yes", action="store_true", help="确认执行 (缺省只演练)")
    ap.add_argument("--keep-commands", action="store_true",
                    help="保留命令/方案/提议, 只清账本与指令")
    ap.add_argument("--no-seed", action="store_true",
                    help="不重置回放游标 (默认会把它对齐到当前最新成交)")
    args = ap.parse_args()

    from app.db.session import execute, fetch_one
    from app.repo import downstream_repo, pms_repo
    from app.services.ledger_service import CURSOR_KEY

    tables = list(LEDGER_TABLES) + ([] if args.keep_commands else COMMAND_TABLES)

    print("将清空以下表:")
    total = 0
    for t in tables:
        try:
            n = int((fetch_one(f"SELECT COUNT(*) AS n FROM {t}") or {}).get("n") or 0)
            total += n
            print(f"  {t:<22} {n} 行")
        except Exception as e:
            print(f"  {t:<22} 读取失败: {type(e).__name__}: {e}")
    print(f"\n合计 {total} 行。以下表**不会**被动: {', '.join(NEVER_TOUCH)}")

    cur = pms_repo.get_param(CURSOR_KEY)
    print(f"\n当前回放游标: {cur or '(空)'}")
    if not args.no_seed:
        try:
            anchor = downstream_repo.latest_filled_order_id()
            print(f"将把游标对齐到当前最新成交: {anchor or '(下游暂无成交)'}")
            print("  → 此后只跟踪新成交, 不再追认历史")
        except Exception as e:
            anchor = None
            print(f"读下游最新成交失败 (游标将清空): {type(e).__name__}: {e}")
    else:
        anchor = None
        print("--no-seed: 游标保持不变")

    if not args.yes:
        print("\n[演练模式] 未删除任何数据。确认后加 --yes 重跑:")
        print("  docker compose run --rm pms-web python scripts/reset_ledger.py --yes")
        return

    print()
    failed = []
    for t in tables:
        try:
            n = execute(f"DELETE FROM {t}")
            print(f"  OK    {t:<22} 删除 {n} 行")
        except Exception as e:
            print(f"  FAIL  {t:<22} {type(e).__name__}: {e}")
            failed.append(t)

    if not args.no_seed:
        try:
            pms_repo.set_param(CURSOR_KEY, anchor or "", updated_by="reset_ledger")
            print(f"  OK    回放游标 → {anchor or '(空, 下次回放自动对齐)'}")
        except Exception as e:
            print(f"  FAIL  游标重置: {type(e).__name__}: {e}")
            failed.append(CURSOR_KEY)

    # ws 通道状态一并归零 —— 指令与 inbox 都清了, 留着旧水位会让补发对不上
    try:
        execute("UPDATE pms_ws_state SET last_seq = 0, acked_seq = 0, server_seq = 0, "
                "resync_flag = 0, conn_state = 'INIT', updated_at = NOW() WHERE id = 1")
        print("  OK    pms_ws_state 水位归零 (inbox 已清空, 水位必须跟着回零)")
    except Exception as e:
        print(f"  WARN  pms_ws_state 归零失败 (表可能还没建): {type(e).__name__}: {e}")

    print("\n" + "-" * 62)
    if failed:
        print(f"FAILED: {', '.join(failed)}")
        sys.exit(1)
    print("账本已清空。下一步:")
    print("  1. 让对账把下游真实持仓补进账本 (以下游为准):")
    print("     curl -X POST 'http://127.0.0.1:38100/api/ops/reconcile?apply_fix=true'")
    print("  2. 或在页面用建仓命令把已有持仓登记成 BASE 批次")
    print("  3. 核对: python scripts/check_db.py")


if __name__ == "__main__":
    main()