"""清理 RAG 索引数据。

用法:
    python reset_index.py              # 清理全部
    python reset_index.py --qdrant     # 仅清理 Qdrant
    python reset_index.py --postgres   # 仅清理 PostgreSQL
"""

import asyncio
import os
import argparse

from dotenv import load_dotenv
load_dotenv()

QDRANT_URL = os.getenv("QDRANT_URL")
QDRANT_API_KEY = os.getenv("QDRANT_API_KEY")

# PostgreSQL 配置（使用分离配置，优先于 DB_URI）
DB_HOST = os.getenv("DB_HOST")
DB_PORT = os.getenv("DB_PORT", "5432")
DB_USER = os.getenv("DB_USER")
DB_PASSWORD = os.getenv("DB_PASSWORD")
DB_NAME = os.getenv("DB_NAME")

# 构建 DB_URI（如果没有直接配置）
DB_URI = os.getenv("DB_URI")
if not DB_URI and all([DB_HOST, DB_PORT, DB_USER, DB_PASSWORD, DB_NAME]):
    DB_URI = f"postgresql://{DB_USER}:{DB_PASSWORD}@{DB_HOST}:{DB_PORT}/{DB_NAME}?sslmode=disable"
COLLECTION_NAME = "rag_documents"
TABLE_NAME = "parent_documents"


def clear_qdrant():
    """删除 Qdrant 集合。"""
    from qdrant_client import QdrantClient

    print("清理 Qdrant...")
    client = QdrantClient(url=QDRANT_URL, api_key=QDRANT_API_KEY)

    collections = client.get_collections().collections
    if any(c.name == COLLECTION_NAME for c in collections):
        client.delete_collection(COLLECTION_NAME)
        print(f"  集合 '{COLLECTION_NAME}' 已删除")
    else:
        print(f"  集合 '{COLLECTION_NAME}' 不存在")


async def clear_postgres():
    """清空 PostgreSQL 表数据。"""
    import asyncpg

    print("清理 PostgreSQL...")
    conn = await asyncpg.connect(dsn=DB_URI)

    try:
        exists = await conn.fetchval(
            "SELECT EXISTS(SELECT 1 FROM information_schema.tables WHERE table_schema = 'public' AND table_name = $1)",
            TABLE_NAME
        )
        if exists:
            count = await conn.fetchval(f"SELECT COUNT(*) FROM {TABLE_NAME}")
            await conn.execute(f"DELETE FROM {TABLE_NAME}")
            print(f"  表 '{TABLE_NAME}' 已清空，删除 {count} 条记录")
        else:
            print(f"  表 '{TABLE_NAME}' 不存在")
    finally:
        await conn.close()


async def main():
    parser = argparse.ArgumentParser(description="清理 RAG 索引数据")
    parser.add_argument("--qdrant", action="store_true", help="仅清理 Qdrant")
    parser.add_argument("--postgres", action="store_true", help="仅清理 PostgreSQL")
    args = parser.parse_args()

    if not args.qdrant and not args.postgres:
        args.qdrant = True
        args.postgres = True

    if args.qdrant:
        clear_qdrant()

    if args.postgres:
        await clear_postgres()

    print("\n完成。运行 `python -m rag_indexer.cli` 重建索引")


if __name__ == "__main__":
    asyncio.run(main())