"""
向量数据库工厂类
支持动态切换Elasticsearch和Infinity向量数据库
"""
from typing import Any, List, Dict, Optional
from conf.config import VectorDBConfig
from services.utils.es import ESConnection as ElasticsearchConnection


class VectorDBFactory:
    """
    向量数据库工厂类
    根据配置创建不同类型的向量数据库连接
    """
    
    @staticmethod
    def get_vector_db():
        """
        获取向量数据库实例
        
        Returns:
            VectorDBBase: 向量数据库实例
        """
        vector_db_type = VectorDBConfig.get_vector_db_type().lower()
        
        if vector_db_type == "es":
            return ElasticsearchVectorDB()
        elif vector_db_type == "infinity":
            return InfinityVectorDB()
        else:
            raise ValueError(f"不支持的向量数据库类型: {vector_db_type}")


class VectorDBBase:
    """
    向量数据库基类
    定义了向量数据库应该实现的接口
    """
    
    def create_index(self, index_name: str, mappings: Dict[str, Any] = None) -> bool:
        """创建索引"""
        raise NotImplementedError()
    
    def insert_document(self, index_name: str, document: Dict[str, Any], id: str = None) -> bool:
        """插入单个文档"""
        raise NotImplementedError()
    
    def bulk_insert(self, index_name: str, documents: List[Dict[str, Any]]) -> Dict[str, Any]:
        """批量插入文档"""
        raise NotImplementedError()
    
    def search(self, index_name: str, query: Dict[str, Any], size: int = 10) -> Dict[str, Any]:
        """搜索文档"""
        raise NotImplementedError()
    
    def vector_search(self, index_name: str, vector_field: str, vector: List[float], size: int = 10, filter: Dict[str, Any] = None) -> Dict[str, Any]:
        """向量检索"""
        raise NotImplementedError()
    
    def hybrid_search(self, index_name: str, text_query: str, vector_field: str, vector: List[float], 
                     size: int = 10, text_weight: float = 0.5, vector_weight: float = 0.5) -> Dict[str, Any]:
        """混合检索"""
        raise NotImplementedError()
    
    def close(self):
        """关闭连接"""
        raise NotImplementedError()


class ElasticsearchVectorDB(VectorDBBase):
    """
    Elasticsearch向量数据库实现
    """
    
    def __init__(self):
        """初始化Elasticsearch向量数据库"""
        self.es_conn = ElasticsearchConnection()
        
    def create_index(self, index_name: str, mappings: Dict[str, Any] = None) -> bool:
        """创建索引"""
        from services.utils.es.index import IndexManager
        index_manager = IndexManager(self.es_conn)
        return index_manager.create_index(index_name, mappings)
    
    def insert_document(self, index_name: str, document: Dict[str, Any], id: str = None) -> bool:
        """插入单个文档"""
        from services.utils.es.document import DocumentManager
        doc_manager = DocumentManager(self.es_conn)
        return doc_manager.insert(index_name, document, id)
    
    def bulk_insert(self, index_name: str, documents: List[Dict[str, Any]]) -> Dict[str, Any]:
        """批量插入文档"""
        from services.utils.es.document import DocumentManager
        doc_manager = DocumentManager(self.es_conn)
        return doc_manager.bulk_insert(index_name, documents)
    
    def search(self, index_name: str, query: Dict[str, Any], size: int = 10) -> Dict[str, Any]:
        """搜索文档"""
        from services.utils.es.search import SearchManager
        search_manager = SearchManager(self.es_conn)
        return search_manager.search(index_name, query, size=size)
    
    def vector_search(self, index_name: str, vector_field: str, vector: List[float], size: int = 10, filter: Dict[str, Any] = None) -> Dict[str, Any]:
        """向量检索"""
        from services.utils.es.search import SearchManager
        search_manager = SearchManager(self.es_conn)
        return search_manager.knn_search(index_name, vector_field, vector, size, filter)
    
    def hybrid_search(self, index_name: str, text_query: str, vector_field: str, vector: List[float], 
                     size: int = 10, text_weight: float = 0.5, vector_weight: float = 0.5) -> Dict[str, Any]:
        """混合检索"""
        from services.utils.es.search import SearchManager
        search_manager = SearchManager(self.es_conn)
        return search_manager.hybrid_search(index_name, text_query, vector_field, vector, size, text_weight=text_weight, vector_weight=vector_weight)
    
    def close(self):
        """关闭连接"""
        self.es_conn.close()


class InfinityVectorDB(VectorDBBase):
    """
    Infinity向量数据库实现
    支持infinity向量数据库的具体实现，包含PDF元数据入库
    """
    
    def __init__(self):
        """初始化Infinity向量数据库"""
        from services.utils.infinity import InfinityVectorDB as _InfinityVectorDB
        from conf.config import VectorDBConfig
        
        # 获取Infinity配置
        host = VectorDBConfig.get_infinity_host()
        port = VectorDBConfig.get_infinity_port()
        user = VectorDBConfig.get_infinity_user()
        password = VectorDBConfig.get_infinity_password()
        
        # 初始化新的InfinityVectorDB实例
        self._infinity_db = _InfinityVectorDB(host=host, port=port, user=user, password=password)
    
    def create_index(self, index_name: str, mappings: Dict[str, Any] = None) -> bool:
        """创建索引"""
        return self._infinity_db.create_index(index_name, mappings)
    
    def insert_document(self, index_name: str, document: Dict[str, Any], id: str = None) -> bool:
        """插入单个文档"""
        return self._infinity_db.insert_document(index_name, document, id)
    
    def bulk_insert(self, index_name: str, documents: List[Dict[str, Any]]) -> Dict[str, Any]:
        """批量插入文档"""
        return self._infinity_db.bulk_insert(index_name, documents)
    
    def search(self, index_name: str, query: Dict[str, Any], size: int = 10) -> Dict[str, Any]:
        """搜索文档"""
        return self._infinity_db.search(index_name, query, size)
    
    def vector_search(self, index_name: str, vector_field: str, vector: List[float], size: int = 10, filter: Dict[str, Any] = None) -> Dict[str, Any]:
        """向量检索"""
        return self._infinity_db.vector_search(index_name, vector_field, vector, size, filter)
    
    def hybrid_search(self, index_name: str, text_query: str, vector_field: str, vector: List[float], 
                     size: int = 10, text_weight: float = 0.5, vector_weight: float = 0.5) -> Dict[str, Any]:
        """混合检索"""
        return self._infinity_db.hybrid_search(index_name, text_query, vector_field, vector, size, text_weight, vector_weight)
    
    def close(self):
        """关闭连接"""
        self._infinity_db.close()