# -*- coding: utf-8 -*-
"""LLM 配置加载 & OpenAI 兼容调用工具（标注算子共享）。

提供三项核心能力：
1. 从 t_model_config 表加载模型配置（按 ID / 按默认）
2. 调用 OpenAI 兼容 chat/completions API
3. 从 LLM 原始输出中提取 JSON
"""

import json
import re
from typing import Any, Dict

from loguru import logger


# ---------------------------------------------------------------------------
# 模型配置加载
# ---------------------------------------------------------------------------

def load_model_config(model_id: str) -> Dict[str, Any]:
    """根据 model_id 从 t_model_config 读取已启用的模型配置。"""

    from datamate.sql_manager.sql_manager import SQLManager
    from sqlalchemy import text as sql_text

    sql = sql_text(
        """
        SELECT model_name, provider, base_url, api_key, type
        FROM t_model_config
        WHERE id = :model_id AND is_enabled = 1
        LIMIT 1
        """
    )
    with SQLManager.create_connect() as conn:
        row = conn.execute(sql, {"model_id": model_id}).fetchone()
    if not row:
        raise ValueError(f"Model config not found or disabled: {model_id}")
    return dict(row._mapping)


def load_default_model_config() -> Dict[str, Any]:
    """加载默认的 chat 模型配置（is_default=1 且 type='chat'）。"""

    from datamate.sql_manager.sql_manager import SQLManager
    from sqlalchemy import text as sql_text

    sql = sql_text(
        """
        SELECT id, model_name, provider, base_url, api_key, type
        FROM t_model_config
        WHERE is_enabled = 1 AND is_default = 1 AND type = 'chat'
        LIMIT 1
        """
    )
    with SQLManager.create_connect() as conn:
        row = conn.execute(sql).fetchone()
    if not row:
        raise ValueError("No default chat model configured in t_model_config")
    return dict(row._mapping)


def get_llm_config(model_id: str = "") -> Dict[str, Any]:
    """优先按 model_id 加载，未提供则加载默认模型。"""

    if model_id:
        return load_model_config(model_id)
    return load_default_model_config()


# ---------------------------------------------------------------------------
# LLM 调用
# ---------------------------------------------------------------------------

def call_llm(
    config: Dict[str, Any],
    prompt: str,
    system_prompt: str = "",
    temperature: float = 0.1,
    max_retries: int = 2,
) -> str:
    """调用 OpenAI 兼容的 chat/completions API 并返回文本内容。"""

    import requests as http_requests

    messages = []
    if system_prompt:
        messages.append({"role": "system", "content": system_prompt})
    messages.append({"role": "user", "content": prompt})

    headers: Dict[str, str] = {"Content-Type": "application/json"}
    api_key = config.get("api_key", "")
    if api_key:
        headers["Authorization"] = f"Bearer {api_key}"

    base_url = str(config["base_url"]).rstrip("/")
    # 兼容 base_url 已包含 /v1 或不包含的情况
    if not base_url.endswith("/chat/completions"):
        if not base_url.endswith("/v1"):
            base_url = f"{base_url}/v1"
        url = f"{base_url}/chat/completions"
    else:
        url = base_url

    body = {
        "model": config["model_name"],
        "messages": messages,
        "temperature": temperature,
    }

    last_err = None
    for attempt in range(max_retries + 1):
        try:
            resp = http_requests.post(url, json=body, headers=headers, timeout=120)
            resp.raise_for_status()
            content = resp.json()["choices"][0]["message"]["content"]
            return content
        except Exception as e:
            last_err = e
            logger.warning(
                "LLM call attempt {}/{} failed: {}",
                attempt + 1,
                max_retries + 1,
                e,
            )

    raise RuntimeError(f"LLM call failed after {max_retries + 1} attempts: {last_err}")


# ---------------------------------------------------------------------------
# JSON 提取
# ---------------------------------------------------------------------------

def extract_json(raw: str) -> Any:
    """从 LLM 原始输出中提取 JSON 对象/数组。

    处理常见干扰：Markdown 代码块、<think> 标签、前后说明文字。
    """

    if not raw:
        raise ValueError("Empty LLM response")

    # 1. 去除 <think>...</think> 等思考标签
    thought_tags = ["think", "thinking", "analysis", "reasoning", "reflection"]
    for tag in thought_tags:
        raw = re.sub(rf"<{tag}>[\s\S]*?</{tag}>", "", raw, flags=re.IGNORECASE)

    # 2. 去除 Markdown 代码块标记
    raw = re.sub(r"```(?:json)?\s*", "", raw)
    raw = raw.replace("```", "")

    # 3. 定位第一个 { 或 [ 到最后一个 } 或 ]
    start = None
    end = None
    for i, ch in enumerate(raw):
        if ch in "{[":
            start = i
            break
    for i in range(len(raw) - 1, -1, -1):
        if raw[i] in "]}":
            end = i + 1
            break

    if start is not None and end is not None and start < end:
        return json.loads(raw[start:end])

    # 兜底：直接尝试解析
    return json.loads(raw.strip())