"""会话身份从「像素哈希」换成「昵称 md5」，旧键再也匹配不上，全部作废重建。

留着不清的后果就是日志里那个循环：待回复恢复找到一堆旧任务 → 按旧指纹去开 →
「实际打开对象与目标不一致」→ 任务留在队列里，下一轮再来一遍，真正的新消息
被挤在后面。原文件都留 .bak。
"""
import json
import os
import shutil
import time

ROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
STAMP = time.strftime("%Y%m%d_%H%M%S")

TARGETS = {
    "pending_replies.json": {"pending": {}},
    "unrepliable_sessions.json": {},
    "conversations.json": {},
    "false_pos_cache.json": {},
}


def main() -> None:
    for name, empty in TARGETS.items():
        path = os.path.join(ROOT, name)
        if not os.path.exists(path):
            print(f"  {name:28} 不存在，跳过")
            continue
        size = os.path.getsize(path)
        try:
            with open(path, encoding="utf-8") as handle:
                data = json.load(handle)
            count = len(data.get("pending", data)) if isinstance(data, dict) else 0
        except Exception:
            count = -1
        if size > 2:
            shutil.copy2(path, f"{path}.{STAMP}.bak")
        with open(path, "w", encoding="utf-8") as handle:
            json.dump(empty, handle, ensure_ascii=False, indent=2)
        print(f"  {name:28} 清空（原有 {count} 条，{size} 字节，已备份）")

    print()
    print("旧身份数据已作废。下一轮监听会按昵称重新建立会话身份和档案。")


if __name__ == "__main__":
    main()