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


@tool
def get_knowledge_list(filter_words: List[str], match_limit: int = 3) -> str:
    """获取知识库列表，返回知识库DocID和标题DocName以及关键字keyword的列表,根据关键字及标题，按用户问题筛选出要用到的文章后， 通过DocID获取文章内容，另外会提供访问文章正文的工具,最终返回的文章数最好在10篇以内
    Args:
        filter_words: 筛选知识库文章的关键词列表，只要符合其中任意一个关键词，就会返回该文章
        match_limit: 筛选知识库文章的匹配计数，默认值为3，即只要符合3个关键词，就会返回该文章。但如果没有符合的文章或数量太少影响作答，可再次调用该工具，将match_limit减1，直到符合文章，但match_limit不能小于1
    Returns:
        一个包含知识库DocID、标题DocName和关键字keyword的列表，每个元素为字符串，字符串格式为"DocID:DocName|keyword"，如果没有keyword，则格式为"DocID:DocName"，每个元素之间用换行符分隔
    """
    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 = 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 = 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}"