"""
directors.llm — 导演层共用的轻量 LLM 客户端
=============================================

配置优先级：环境变量 DEEPSEEK_* > agent-local local.yaml(llm) > 09_ave/config.yaml(llm)
（与评论生成 AIGenerator 一致的取配置方式，但独立实现，避免跨模块耦合）

仅提供最简 chat 调用 + JSON 解析，供各导演实现使用。
"""
from __future__ import annotations

import json
import logging
import os
import re
import urllib.error
import urllib.request
from pathlib import Path
from typing import Any

import yaml
from lib.http import urlopen as _noproxy_urlopen  # 禁代理+重试

log = logging.getLogger("directors.llm")

_SCRIPTS = Path(__file__).resolve().parent.parent      # 09_ave/scripts/
_AVE_DIR = _SCRIPTS.parent                              # 09_ave/
_AGENT_LOCAL = Path(os.environ.get("AGENT_LOCAL") or (_AVE_DIR.parents[2] / "agent-local"))
_LOCAL_CFG = _AGENT_LOCAL / "tools" / "ave" / "config" / "local.yaml"
_AVE_CFG = _AVE_DIR / "config.yaml"


def load_llm_config() -> dict:
    """三级优先级读取 LLM 配置"""
    cfg: dict = {}
    # ③ 09_ave/config.yaml
    if _AVE_CFG.exists():
        try:
            raw = yaml.safe_load(_AVE_CFG.read_text(encoding="utf-8")) or {}
            cfg.update(raw.get("llm") or {})
        except Exception:
            pass
    # ② 配置中心 local.yaml → llm
    if _LOCAL_CFG.exists():
        try:
            raw = yaml.safe_load(_LOCAL_CFG.read_text(encoding="utf-8")) or {}
            cfg.update(raw.get("llm") or {})
        except Exception:
            pass
    # ① 环境变量
    if os.environ.get("DEEPSEEK_API_KEY"):
        cfg["api_key"] = os.environ["DEEPSEEK_API_KEY"]
    if os.environ.get("DEEPSEEK_BASE_URL"):
        cfg["base_url"] = os.environ["DEEPSEEK_BASE_URL"]
    if os.environ.get("DEEPSEEK_MODEL"):
        cfg["model"] = os.environ["DEEPSEEK_MODEL"]
    cfg.setdefault("base_url", "https://api.deepseek.com/v1")
    cfg.setdefault("model", "deepseek-v4-flash")
    return cfg


class DirectorLLM:
    """导演层 LLM 客户端（单次同步调用）"""

    def __init__(self, timeout: int = 90):
        cfg = load_llm_config()
        self.api_key = (cfg.get("api_key") or "").strip()
        self.base_url = (cfg.get("base_url") or "https://api.deepseek.com/v1").rstrip("/")
        self.model = cfg.get("model") or "deepseek-v4-flash"
        self.timeout = timeout
        self._fails = 0

    @property
    def available(self) -> bool:
        return bool(self.api_key) and self._fails < 3

    def chat(self, prompt: str, system: str = "", temperature: float = 0.7,
             max_tokens: int = 3000) -> str:
        """单次对话（失败返回空串，连续 3 次失败熔断）"""
        if not self.available:
            log.warning("  ⚠️  LLM 不可用（未配 key 或已熔断）")
            return ""
        messages = []
        if system:
            messages.append({"role": "system", "content": system})
        messages.append({"role": "user", "content": prompt})
        body = json.dumps({
            "model": self.model,
            "messages": messages,
            "temperature": temperature,
            "max_tokens": max_tokens,
            # 关思考模式：分镜生成不需要长推理，省 token 且更快
            "thinking": {"type": "disabled"},
        }).encode("utf-8")
        req = urllib.request.Request(
            f"{self.base_url}/chat/completions", data=body,
            headers={"Content-Type": "application/json",
                     "Authorization": f"Bearer {self.api_key}"})
        try:
            with _noproxy_urlopen(req, timeout=self.timeout) as r:
                data = json.loads(r.read().decode("utf-8"))
            content = (data.get("choices") or [{}])[0].get("message", {}).get("content", "")
            self._fails = 0
            return (content or "").strip()
        except urllib.error.HTTPError as e:
            detail = e.read().decode("utf-8", errors="ignore")[:200]
            log.error("  ❌ LLM HTTP %s: %s", e.code, detail)
            self._fails += 1
            return ""
        except Exception as e:
            log.error("  ❌ LLM 调用失败: %s", e)
            self._fails += 1
            return ""

    # ── JSON 解析（容错）──────────────────────────────

    @staticmethod
    def parse_json(text: str) -> Any:
        """从 LLM 输出里提取 JSON（容忍 markdown 围栏 / 前后废话）"""
        if not text:
            return None
        t = text.strip()
        # 去 markdown 围栏
        m = re.search(r"```(?:json)?\s*(.+?)\s*```", t, re.S)
        if m:
            t = m.group(1).strip()
        # 直接解析
        try:
            return json.loads(t)
        except Exception:
            pass
        # 找第一个 { 或 [ 到最后一个 } 或 ]
        for open_c, close_c in (("{", "}"), ("[", "]")):
            i, j = t.find(open_c), t.rfind(close_c)
            if i >= 0 and j > i:
                try:
                    return json.loads(t[i:j + 1])
                except Exception:
                    continue
        log.warning("  ⚠️  LLM 输出无法解析为 JSON（前 120 字: %s）", t[:120])
        return None