#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
DashVector向量检索模块
用于查找相似topic
"""

import dashscope
from dashvector import Client
import logging
from typing import List, Dict, Optional
import sys
import os

# 添加项目根目录到Python路径
sys.path.append(os.path.dirname(os.path.abspath(__file__)))

from log_config import setup_logger

# 配置日志记录器
logger = setup_logger(
    name='dashvector_similar',
    log_file='logs/dashvector_similar.log',
    error_log_file='logs/dashvector_similar_error.log',
    level=logging.INFO,
    console_output=True
)

# === 配置 ===
DASHVECTOR_API_KEY = 'sk-55x6oBXypSlPHQ8NvPHfyBABcMIMUE0407A0FCC2A11F0B9C802831A608ABB'
DASHVECTOR_ENDPOINT = 'vrs-cn-2ml4jm42o0001r.dashvector.cn-hangzhou.aliyuncs.com'
dashscope.api_key = 'sk-6d22dd845a624d9c92a821d24a50e2e8'

collection_name = "ai_articles_collection"  # 使用包含完整元数据的集合

def get_embedding(text: str) -> List[float]:
    """
    生成文本的向量embedding
    
    Args:
        text: 输入文本
    
    Returns:
        List[float]: 向量embedding
    """
    try:
        logger.info(f"开始生成embedding，文本: {text}")
        resp = dashscope.TextEmbedding.call(
            model='text-embedding-v2',
            input=text
        )
        if resp.status_code == 200:
            embedding = resp.output['embeddings'][0]['embedding']
            logger.info(f"生成embedding成功，向量维度: {len(embedding)}")
            return embedding
        else:
            error_msg = f"DashScope API 错误: {resp.code} - {resp.message}"
            logger.error(error_msg)
            raise Exception(error_msg)
    except Exception as e:
        error_msg = f"生成 embedding 失败: {str(e)}"
        logger.error(error_msg)
        raise Exception(error_msg)

# === 初始化客户端 ===
client = None
collection = None

def init_dashvector_client():
    """
    初始化DashVector客户端和集合
    """
    global client, collection
    
    try:
        logger.info("开始初始化DashVector客户端")
        client = Client(api_key=DASHVECTOR_API_KEY, endpoint=DASHVECTOR_ENDPOINT)
        logger.info("DashVector客户端创建成功")
        
        # 获取已存在的集合
        collection = client.get(collection_name)
        if collection is None:
            error_msg = f"集合 '{collection_name}' 不存在！请先确保它已创建并插入数据。"
            logger.error(error_msg)
            raise Exception(error_msg)
        
        logger.info(f"成功连接到集合: {collection_name}")
        return True
    except Exception as e:
        logger.error(f"初始化DashVector客户端失败: {e}")
        return False

# === 查询函数 ===
def search_chinese(query_text: str, topk: int = 3, similarity_threshold: float = 0.5) -> List[Dict]:
    """
    检索相似topic
    
    Args:
        query_text: 查询文本
        topk: 返回top k个结果
        similarity_threshold: 相似度阈值，默认0.5
    
    Returns:
        List[Dict]: 相似topic列表，格式为 [{"id": str, "title": str, "created_at": str, "similar": float}]
    """
    global collection
    
    # 确保客户端已初始化
    if collection is None:
        logger.warning("DashVector客户端未初始化，尝试初始化")
        if not init_dashvector_client():
            logger.error("初始化失败，无法执行检索")
            return []
    
    logger.info(f"开始检索相似topic，查询文本: '{query_text}', topk={topk}, 相似度阈值={similarity_threshold}")
    
    try:
        # 生成查询向量
        query_vec = get_embedding(query_text)
    except Exception as e:
        logger.error(f"生成查询向量失败: {e}")
        return []

    # 执行向量检索，增加返回字段：id, title, created_at
    try:
        logger.info(f"开始向量检索，topk={topk}")
        rets = collection.query(vector=query_vec, topk=topk, output_fields=["id", "title", "created_at"])
    except Exception as e:
        logger.error(f"向量检索异常: {e}")
        return []
    
    if rets.code != 0:
        logger.error(f"向量检索失败: {rets.message}")
        return []

    results = rets.output
    if not results:
        logger.warning("未找到相关结果")
        return []

    logger.info(f"检索成功，原始返回 {len(results)} 条结果")
    
    # 过滤相似度低于阈值的结果
    filtered_results = []
    for i, doc in enumerate(results, 1):
        score = doc.score
        article_id = doc.fields.get('id', '')
        title = doc.fields.get('title', '')
        created_at = doc.fields.get('created_at', '')
        
        logger.info(f"  结果[{i}] 相似度: {score:.4f} | ID: {article_id} | 标题: {title} | 创建时间: {created_at}")
        
        # 相似度阈值过滤（注意：score越小越相似，0表示最相似）
        if score <= similarity_threshold:
            filtered_results.append({
                "id": article_id,
                "title": title,
                "created_at": created_at,
                "similar": score
            })
            logger.info(f"  结果[{i}] 通过相似度过滤（{score:.4f} <= {similarity_threshold}）")
        else:
            logger.info(f"  结果[{i}] 未通过相似度过滤（{score:.4f} > {similarity_threshold}）")
    
    # 最多返回2条
    if len(filtered_results) > 2:
        filtered_results = filtered_results[:2]
        logger.info(f"限制返回结果数量为2条")
    
    logger.info(f"最终返回 {len(filtered_results)} 条相似topic")
    return filtered_results

# === 测试查询 ===
if __name__ == "__main__":
    # 初始化客户端
    if not init_dashvector_client():
        logger.error("初始化失败，退出")
        sys.exit(1)
    
    test_queries = [
        "早泄怎么治疗？",
        "肾虚吃什么药？",
        "前列腺肥大的原因",
        "阳痿能治好吗？",
        "早泄可以吃哪些中药？",
		"前列腺增生肥大能治好吗"
    ]

    for q in test_queries:
        print(f"\n{'='*60}")
        print(f"🔍 测试查询: {q}")
        print(f"{'='*60}")
        
        results = search_chinese(q, topk=3, similarity_threshold=0.5)
        
        if results:
            print(f"\n✅ 找到 {len(results)} 条相关结果:")
            for i, item in enumerate(results, 1):
                print(f"  [{i}] 相似度: {item['similar']:.4f} | ID: {item.get('id', 'N/A')} | 标题: {item.get('title', 'N/A')} | 创建时间: {item.get('created_at', 'N/A')}")
        else:
            print("⚠️ 未找到符合条件的相关结果")
    
    print(f"\n{'='*60}")
    print("测试完成")
    print(f"{'='*60}")