import os
import sys
sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__), '..', '..')))
import requests
from dotenv import load_dotenv
from foundation.models.base_online_platform import BaseApiPlatform
from foundation.base.config import config_handler
from foundation.logger.loggering import server_logger
from foundation.utils.common import handler_err
from openai import OpenAI
from langchain_core.embeddings import Embeddings
#from chromadb.utils.embedding_functions import EmbeddingFunction
from typing import List
import numpy as np



class SiliconFlowEmbeddings(Embeddings):
    """
    LangChain 兼容的硅基流动嵌入模型客户端
    使用方式：
        embeddings = SiliconFlowEmbeddings(
            model="netease-youdao/bce-embedding-base_v1",
            api_key="sk-..."
        )
        vectors = embeddings.embed_documents(["文本1", "文本2"])
    """
    def __init__(self, base_url: str, api_key: str, embed_model_id: str):
        self.model = embed_model_id
        self.api_key = api_key
        if not self.api_key:
            raise ValueError("必须提供 api_key 或设置环境变量 SILICONFLOW_API_KEY")
        self.client = OpenAI(
            api_key=self.api_key,
            base_url=base_url
        )

    def embed_documents(self, texts: List[str]) -> List[List[float]]:
        """对文档列表进行向量化"""
        if not texts:
            return []
        response = self.client.embeddings.create(
            model=self.model,
            input=texts
        )
        return [item.embedding for item in response.data]

    def embed_query(self, text: str) -> List[float]:
        """对查询文本进行向量化"""
        return self.embed_documents([text])[0]





class SiliconFlowAPI(BaseApiPlatform):
    def __init__(self , trace_id=""):
        self.trace_id = trace_id
        self.config_prefix = "siliconflow"
        self.model_server_url = config_handler.get(self.config_prefix, "SLCF_MODEL_SERVER_URL")
        self.api_key = config_handler.get(self.config_prefix, "SLCF_API_KEY")
        self.embed_url = self.model_server_url +"/embeddings" #/embeddings 
        self.rerank_url = self.model_server_url +"/rerank"  #/rerank
        self.embed_model_id = config_handler.get(self.config_prefix, "SLCF_EMBED_MODEL_ID")
        self.rerank_model_id = config_handler.get(self.config_prefix, "SLCF_REANKER_MODEL_ID")
        server_logger.info(f"SiliconFlowAPI -> embed_url:{self.embed_url},rerank_url:{self.rerank_url}")
        server_logger.info(f"SiliconFlowAPI -> embed_model_id:{self.embed_model_id},rerank_model_id:{self.rerank_model_id}")
        self.client = self.get_openai_client(self.model_server_url, self.api_key)
        # 创建LangChain兼容的嵌入对象
        langchain_embeddings = SiliconFlowEmbeddings(base_url = self.model_server_url , api_key=self.api_key , embed_model_id=self.embed_model_id)
        #self.embed_model = ChromaSiliconFlowEmbedding(embeddings=langchain_embeddings)



    def get_embed_model(self):
        """
            获取嵌入模型
        """
        return self.embed_model


    def get_embeddings(self, texts: list[str]):
        """获取文本向量（embedding）"""
        try:
            response = self.client.embeddings.create(
                model=self.embed_model_id,  # 指定向量模型
                input=texts if isinstance(texts, list) else [texts]
            )
            # 返回 embeddings 列表
            return [data.embedding for data in response.data]
        except Exception as e:
            handler_err(server_logger, trace_id=self.trace_id, err=e, err_name='Embedding 调用失败')
            raise


    def rerank(self, input_query: str, documents: list, top_n: int = 5, return_documents: bool = True):
        """
            使用 BGE 重排序模型进行相关性打分
            使用重排序模型对候选文档进行排序
            :param query: 用户查询语句
            :param documents: 候选文本列表
            :param top_n: 返回前 N 个结果
            :return: 排序后的结果列表，包含文本和相似度分数
        """
        try:
            headers = {
                "Authorization": f"Bearer {self.api_key}",
                "Content-Type": "application/json"
            }
            payload = {
                "model": self.rerank_model_id,
                "query": input_query,
                "documents": documents,
                "top_n": top_n,
                "return_documents": return_documents
            }
            response = requests.post(self.rerank_url, json=payload, headers=headers)
            response.raise_for_status()
            data = response.json()

            results = []
            for item in data['results']:
                results.append({
                    "index": item['index'],
                    "relevance_score": item['relevance_score'],
                    "document": item.get('document', {}).get('text', None)
                })
            return results
        except Exception as e:
            handler_err(server_logger, trace_id=self.trace_id, err=e, err_name='重排序调用失败')
            raise




# 使用示例
if __name__ == "__main__":
    # 初始化客户端（需提前设置环境变量 SILICONFLOW_API_KEY）
    client = SiliconFlowAPI()

    # 示例1：向量化文本
    texts = ["奶牛养殖技术", "牛肉市场价格分析"]
    embeddings = client.get_embeddings(texts)
    print(f"向量维度：{len(embeddings[0])}")  # 输出向量维度

    # 示例2：重排序文档
    query = "如何提高牛奶产量？"
    documents = [
        "奶牛饲料配比指南",
        "牧场管理规范",
        "牛奶加工工艺流程",
        "提高产奶量的10个技巧"
    ]
    rerank_results = client.rerank(query, documents)
    
    print("\n重排序结果：")
    for result in sorted(rerank_results, key=lambda x: x['relevance_score'], reverse=True):
        print(f"{result['index']} (得分: {result['relevance_score']:.2f}): {documents[result['index']]}")