import re
from typing import List, Dict, Any
import requests
from vanna.base import VannaBase
from Config import *


class VannaUtil(VannaBase):
    def __init__(self):
        super().__init__()
        self.api_key = MODEL_API_KEY
        self.base_url = MODEL_GENERATION_TEXT_URL  # 阿里云专用API地址
        self.model = QWEN_MODEL_NAME  # 根据实际模型名称调整
        self.training_data = []
        self.chat_history = []

    # ---------- 必须实现的抽象方法 ----------
    def add_ddl(self, ddl: str, **kwargs) -> None:
        self.training_data.append({"type": "ddl", "content": ddl})

    def add_documentation(self, doc: str, **kwargs) -> None:
        self.training_data.append({"type": "documentation", "content": doc})

    def add_question_sql(self, question: str, sql: str, **kwargs) -> None:
        self.training_data.append({"type": "qa", "question": question, "sql": sql})

    def get_related_ddl(self, question: str, **kwargs) -> str:
        return "\n".join([item["content"] for item in self.training_data if item["type"] == "ddl"])

    def get_related_documentation(self, question: str, **kwargs) -> str:
        return "\n".join([item["content"] for item in self.training_data if item["type"] == "documentation"])

    def get_training_data(self, **kwargs) -> List[Dict[str, Any]]:
        return self.training_data

    # ---------- 对话方法 ----------
    def system_message(self, message: str) -> None:
        self.chat_history = [{"role": "system", "content": message}]

    def user_message(self, message: str) -> None:
        self.chat_history.append({"role": "user", "content": message})

    def assistant_message(self, message: str) -> None:
        self.chat_history.append({"role": "assistant", "content": message})

    def submit_prompt(self, prompt: str, **kwargs) -> str:
        return self.generate_sql(question=prompt)

    # ---------- 其他方法 ----------
    def remove_training_data(self, id: str, **kwargs) -> bool:
        return True

    def generate_embedding(self, text: str, **kwargs) -> List[float]:
        return []

    def get_similar_question_sql(self, question: str, **kwargs) -> List[Dict[str, Any]]:
        return []

    def _clean_sql_output(self, raw_sql: str) -> str:
        """增强版清洗逻辑"""
        # 移除所有非SQL内容
        cleaned = re.sub(r'^.*?(?=SELECT)', '', raw_sql, flags=re.IGNORECASE | re.DOTALL)
        # 提取第一个完整SQL语句
        match = re.search(r'(SELECT\s.+?;)', cleaned, re.IGNORECASE | re.DOTALL)
        if match:
            # 标准化空格和换行
            clean_sql = re.sub(r'\s+', ' ', match.group(1)).strip()
            # 确保没有重复SELECT
            clean_sql = re.sub(r'(SELECT\s+)+', 'SELECT ', clean_sql, flags=re.IGNORECASE)
            return clean_sql
        return raw_sql

    def _build_sql_prompt(self, question: str) -> str:
        """强化提示词"""
        return f"""严格按以下要求生成Postgresql查询：

        表结构：
        {self.get_related_ddl(question)}

        问题：{question}

        生成规则：
        1. 只输出一个标准的SELECT语句
        2. 绝对不要使用任何代码块标记
        3. 语句以分号结尾
        4. 不要包含任何解释或注释
        5. 若需要多表查询，使用显式JOIN语法
        6. 确保没有重复的SELECT关键字
        """

    def generate_sql(self, question: str, **kwargs) -> str:
        """同步生成SQL"""
        try:
            headers = {
                "Authorization": f"Bearer {self.api_key}",
                "Content-Type": "application/json"
            }

            data = {
                "model": self.model,
                "input": {
                    "messages": [{
                        "role": "user",
                        "content": self._build_sql_prompt(question)
                    }]
                },
                "parameters": {
                    "temperature": 0.1,
                    "max_tokens": 5000,
                    "result_format": "text"
                }
            }

            response = requests.post(self.base_url, headers=headers, json=data)
            response.raise_for_status()

            raw_sql = response.json()['output']['text']
            return self._clean_sql_output(raw_sql)

        except Exception as e:
            print(f"\nAPI请求错误: {str(e)}")
            return ""