from langchain.tools import tool
from typing import List
import requests
import json
import os
from .base_tool import html_to_text, get_unique_match_count
from config.settings import settings


# @tool
# def get_knowledge_list(filter_words: List[str], match_limit: int = 3) -> str:
#     """根据关键词筛选知识库文章列表

#     Args:
#         filter_words: 关键词列表，匹配任一关键词即返回
#         match_limit: 最小匹配数(默认3)，无结果时可减少重试(最小1)

#     Returns:
#         文章列表，格式：每行"DocID:DocName|keyword"，用于后续获取内容
#     """
#     print(f"正在查询知识库列表，筛选关键词：{filter_words} 匹配下限：{match_limit}")

#     kms_list_url = settings.KMS_LIST_URL  # os.getenv("KMS_LIST_URL")
#     payload = {
#         "categorycodeList": [],
#         "ignoreTypeSub": False,
#         "ignoreStandardByTopic": True,
#     }

#     headers = {
#         "Accept": "application/json, text/plain, */*",
#         "Content-Type": "application/json",
#         "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36",
#     }

#     try:
#         response = requests.post(
#             kms_list_url, headers=headers, json=payload, timeout=10
#         )
#         if response.status_code == 200:
#             data = response.json()
#             matched_lines = ""
#             for doc in data["docList"]:
#                 doc_id = doc["DocID"]
#                 doc_name = doc["DocName"]
#                 doc_keywords = doc["keyword"]
#                 search_text = f"{doc_name} {doc_keywords}".lower()

#                 if not filter_words:
#                     line = (
#                         f"{doc_id}:{doc_name}|{doc_keywords}"
#                         if doc_keywords
#                         else f"{doc_id}:{doc_name}"
#                     )
#                     matched_lines += line + "\n"
#                 else:
#                     match_count = get_unique_match_count(search_text, filter_words)
#                     if match_count >= match_limit:
#                         line = (
#                             f"{doc_id}:{doc_name}|{doc_keywords}"
#                             if doc_keywords
#                             else f"{doc_id}:{doc_name}"
#                         )
#                         matched_lines += line + "\n"

#             return matched_lines
#         else:
#             return f"请求失败，状态码: {response.status_code}"
#     except Exception as e:
#         return f"请求异常: {e}"


# @tool
# def get_knowledge_content(docid: str) -> str:
#     """获取知识库文章内容

#     Args:
#         docid: 知识库文章的DocID

#     Returns:
#         知识库文章内容
#     """
#     print(f"正在获取知识库文章内容，DocID: {docid}")

#     kms_view_url = settings.KMS_VIEW_URL  # os.getenv("KMS_VIEW_URL")
#     headers = {
#         "Accept": "application/json, text/plain, */*",
#         "Content-Type": "application/json",
#         "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36",
#     }

#     try:
#         payload = {"docid": docid}
#         response = requests.post(
#             kms_view_url, headers=headers, json=payload, timeout=10
#         )
#         if response.status_code == 200:
#             data = response.json()
#             doc_html = data.get("DocHtml", "")
#             plain_text = html_to_text(doc_html)
#             print(f"已获取到ID: {docid}的文章内容，长度{len(plain_text)}")
#             return plain_text
#         else:
#             return f"请求失败，状态码: {response.status_code}"
#     except Exception as e:
#         return f"请求异常: {e}"


@tool
def search_and_retrieve_knowledge(keywords: List[str], max_matches: int = 5) -> str:
    """搜索并获取最相关的知识库文章内容

    此工具会：
    1. 自动搜索知识库文章列表
    2. 根据关键词匹配度排序，选择匹配最多关键词的文章
    3. 自动获取并返回该文章的完整内容
    拆分关键词核心原则:
    最小化原则：将用户问题拆分为最小单位的关键词,最好2个字一个关键词
    例如："销售订单终止数量失败" → ["销售", "订单", "终止", "数量", "失败"],"销售订单提示没有新建权限怎么办" → ["销售", "订单", "新建", "权限"]
    Args:
        keywords: 关键词列表，会尽可能细化匹配
        max_matches: 最多考虑的匹配文章数(默认5)

    Returns:
        最相关文章的完整内容
    """
    print(f"正在搜索知识库，关键词：{keywords}")

    # 1. 获取文章列表
    kms_list_url = settings.KMS_LIST_URL
    payload = {
        "categorycodeList": [],
        "ignoreTypeSub": False,
        "ignoreStandardByTopic": True,
    }

    headers = {
        "Accept": "application/json, text/plain, */*",
        "Content-Type": "application/json",
        "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36",
    }

    try:
        # 获取所有文章
        response = requests.post(
            kms_list_url, headers=headers, json=payload, timeout=10
        )
        if response.status_code != 200:
            return f"获取文章列表失败，状态码: {response.status_code}"

        data = response.json()
        doc_list = data.get("docList", [])

        if not doc_list:
            return "知识库中没有找到文章"

        # 2. 计算匹配度并排序
        matched_docs = []
        for doc in doc_list:
            doc_id = doc["DocID"]
            doc_name = doc["DocName"]
            doc_keywords = doc["keyword"]
            search_text = f"{doc_name} {doc_keywords}".lower()

            # 计算匹配的关键词数量
            match_count = get_unique_match_count(search_text, keywords)
            if match_count > 0:
                matched_docs.append({
                    "doc_id": doc_id,
                    "doc_name": doc_name,
                    "match_count": match_count,
                    "keywords": doc_keywords
                })

        if not matched_docs:
            return "没有找到与关键词相关的文章"

        # 按匹配数量降序排序，选择前max_matches个
        matched_docs.sort(key=lambda x: x["match_count"], reverse=True)
        top_docs = matched_docs[:max_matches]

        print(f"找到 {len(matched_docs)} 篇相关文章，前{len(top_docs)}篇匹配度最高")
        for i, doc in enumerate(top_docs):
            print(f"  {i+1}. {doc['doc_name']} (匹配{doc['match_count']}个关键词)")

        # 3. 获取匹配度最高的文章内容
        best_doc = top_docs[0]
        print(f"选择最相关的文章: {best_doc['doc_name']} (DocID: {best_doc['doc_id']})")

        # 4. 获取文章内容
        kms_view_url = settings.KMS_VIEW_URL
        content_payload = {"docid": best_doc['doc_id']}
        content_response = requests.post(
            kms_view_url, headers=headers, json=content_payload, timeout=10
        )

        if content_response.status_code != 200:
            return f"获取文章内容失败，状态码: {content_response.status_code}"

        content_data = content_response.json()
        doc_html = content_data.get("DocHtml", "")
        plain_text = html_to_text(doc_html)

        # 5. 构建返回结果
        result = f"【知识库文章】\n"
        result += f"标题: {best_doc['doc_name']}\n"
        result += f"匹配关键词数量: {best_doc['match_count']}\n"
        if best_doc['keywords']:
            result += f"文章关键词: {best_doc['keywords']}\n"
        result += f"内容: {plain_text}\n"

        print(f"已获取文章内容，长度: {len(plain_text)} 字符")
        return result

    except Exception as e:
        return f"搜索和获取知识库文章时出错: {e}"