#!/usr/bin/env python3
"""
一次性修复历史交易记录标签:
将 trade_records 里“止损但实际盈利”的记录改为“保本止盈”.

默认条件(可通过参数修改):
- monitor_type = 下单监控
- result = 止损
- pnl_amount > 0

用法示例:
1) 仅预览(不落库):
   python scripts/fix_breakeven_labels.py --db ./crypto.db --dry-run

2) 执行修复:
   python scripts/fix_breakeven_labels.py --db ./crypto.db --apply
"""

from __future__ import annotations

import argparse
import sqlite3
import sys
from pathlib import Path


def parse_args() -> argparse.Namespace:
    parser = argparse.ArgumentParser(description="Fix historical stop-loss records with positive pnl.")
    parser.add_argument("--db", required=True, help="Path to sqlite db file, e.g. ./crypto.db")
    parser.add_argument("--monitor-type", default="下单监控", help="Filter by monitor_type (default: 下单监控)")
    parser.add_argument("--from-result", default="止损", help="Source result label (default: 止损)")
    parser.add_argument("--to-result", default="保本止盈", help="Target result label (default: 保本止盈)")
    parser.add_argument("--dry-run", action="store_true", help="Preview only, no write")
    parser.add_argument("--apply", action="store_true", help="Execute update")
    return parser.parse_args()


def main() -> int:
    args = parse_args()
    db_path = Path(args.db).expanduser().resolve()
    if not db_path.exists():
        print(f"[ERR] DB not found: {db_path}")
        return 1

    if args.dry_run and args.apply:
        print("[ERR] --dry-run and --apply are mutually exclusive.")
        return 1
    if not args.dry_run and not args.apply:
        print("[INFO] No mode provided, defaulting to --dry-run.")
        args.dry_run = True

    conn = sqlite3.connect(str(db_path))
    conn.row_factory = sqlite3.Row
    cur = conn.cursor()

    where_sql = """
        monitor_type = ?
        AND result = ?
        AND CAST(COALESCE(pnl_amount, 0) AS REAL) > 0
    """
    params = (args.monitor_type, args.from_result)

    cur.execute(f"SELECT COUNT(*) AS c FROM trade_records WHERE {where_sql}", params)
    will_change = int(cur.fetchone()["c"])
    print(f"[INFO] Candidate rows: {will_change}")

    if will_change == 0:
        print("[INFO] Nothing to update.")
        conn.close()
        return 0

    cur.execute(
        f"""
        SELECT id, symbol, result, pnl_amount, closed_at
        FROM trade_records
        WHERE {where_sql}
        ORDER BY id DESC
        LIMIT 10
        """,
        params,
    )
    sample = cur.fetchall()
    print("[INFO] Sample (latest 10):")
    for r in sample:
        print(
            f"  id={r['id']} symbol={r['symbol']} result={r['result']} "
            f"pnl={r['pnl_amount']} closed_at={r['closed_at']}"
        )

    if args.dry_run:
        print("[DRY-RUN] No write executed.")
        conn.close()
        return 0

    cur.execute(
        f"UPDATE trade_records SET result=? WHERE {where_sql}",
        (args.to_result, *params),
    )
    changed = int(cur.rowcount)
    conn.commit()
    conn.close()
    print(f"[DONE] Updated rows: {changed}")
    return 0


if __name__ == "__main__":
    sys.exit(main())