from __future__ import annotations
from dataclasses import dataclass
from typing import Optional, Dict
import os

@dataclass
class OpenRouterConfig:
    api_key: Optional[str]
    model: str = "deepseek/deepseek-r1-0528"
    base_url: str = "https://openrouter.ai/api/v1"
    temperature: float = 0.2
    max_tokens: int = 800
    headers: Optional[Dict[str, str]] = None

def load_openrouter_config(api_key: Optional[str] = None) -> OpenRouterConfig:
    key = api_key or os.getenv("OPENROUTER_API_KEY") or os.getenv("OPENAI_API_KEY")
    model = os.getenv("FACTCHECK_MODEL") or "deepseek/deepseek-r1-0528"
    try:
        max_tokens = int(os.getenv("FACTCHECK_MAX_TOKENS", "800"))
    except ValueError:
        max_tokens = 800
    headers = {
        "HTTP-Referer": os.getenv("APP_DOMAIN", "http://localhost"),
        "X-Title": os.getenv("APP_TITLE", "CVE Fact Checker"),
    }
    return OpenRouterConfig(api_key=key, headers=headers, model=model, max_tokens=max_tokens)