"""
简易命令行入口，使用默认配置构建 RAG 索引。
"""

import asyncio
import logging
import sys
from pathlib import Path

from rag_indexer.index_builder import IndexBuilder, IndexBuilderConfig
from rag_indexer.splitters import SplitterType

logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s - %(name)s - %(levelname)s - %(message)s"
)
logger = logging.getLogger(__name__)

# 默认配置（所有连接参数从环境变量读取）
COLLECTION_NAME = "rag_documents"
SPLITTER_TYPE = SplitterType.PARENT_CHILD
CHILD_SPLITTER_TYPE = SplitterType.SEMANTIC

# 父子块大小参数（可根据需要调整）
PARENT_CHUNK_SIZE = 1000
PARENT_CHUNK_OVERLAP = 100
CHILD_CHUNK_SIZE = 200
CHILD_CHUNK_OVERLAP = 20
SEARCH_K = 5


def get_input_path() -> Path:
    """从命令行参数获取输入路径，若未提供则使用默认示例路径。"""
    if len(sys.argv) > 1:
        return Path(sys.argv[1])
    # 默认测试路径（可按需修改）
    return Path("data/user_docs/a.txt")


async def main():
    input_path = get_input_path()
    if not input_path.exists():
        logger.error("路径不存在: %s", input_path)
        sys.exit(1)

    # 构建配置（使用全部默认值）
    config = IndexBuilderConfig(
        collection_name=COLLECTION_NAME,
        splitter_type=SPLITTER_TYPE,
        parent_chunk_size=PARENT_CHUNK_SIZE,
        parent_chunk_overlap=PARENT_CHUNK_OVERLAP,
        child_chunk_size=CHILD_CHUNK_SIZE,
        child_chunk_overlap=CHILD_CHUNK_OVERLAP,
        child_splitter_type=CHILD_SPLITTER_TYPE,
        search_k=SEARCH_K,
        # docstore 默认使用 create_docstore 从环境变量读取 PostgreSQL 连接
    )

    builder = IndexBuilder(config)
    is_directory = input_path.is_dir()

    try:
        async with builder:
            if is_directory:
                chunk_count = await builder.build_from_directory(input_path, recursive=True)
            else:
                chunk_count = await builder.build_from_file(input_path)

        print(f"\n索引构建完成。共索引 {chunk_count} 个块")
        info = builder.get_collection_info()
        print(f"集合 '{info['name']}' 包含 {info['vectors_count']} 个向量（维度：{info['vector_size']}）")

    except Exception as e:
        logger.exception("索引构建失败: %s", e)
        sys.exit(1)


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