from __future__ import annotations

from functools import lru_cache
import os
from pathlib import Path
from typing import Optional
from pydantic_settings import BaseSettings, SettingsConfigDict


def _apply_local_supabase_env() -> None:
    """
    优先加载本地 .env 中的 Supabase 配置，避免宿主环境遗留的线上变量导致鉴权失败。
    仅覆盖 SUPABASE_* 相关键。
    """
    env_path = Path(__file__).resolve().parents[1] / ".env"
    if not env_path.exists():
        return

    content = env_path.read_text(encoding="utf-8").splitlines()
    kv: dict[str, str] = {}
    for line in content:
        stripped = line.strip()
        if not stripped or stripped.startswith("#") or "=" not in stripped:
            continue
        key, value = stripped.split("=", 1)
        kv[key.strip()] = value.strip()

    for key in ("SUPABASE_URL", "SUPABASE_SERVICE_ROLE_KEY", "SUPABASE_ANON_KEY"):
        file_value = kv.get(key)
        if not file_value:
            continue
        os.environ[key] = file_value


_apply_local_supabase_env()


class Settings(BaseSettings):
    """集中管理项目配置，来源于 .env / 环境变量。"""

    model_config = SettingsConfigDict(env_file=".env", env_file_encoding="utf-8", extra="ignore")

    supabase_url: str
    supabase_anon_key: Optional[str] = None
    supabase_service_role_key: str
    redis_url: str = "redis://localhost:6379/0"
    frontend_url: str = "http://localhost:3000"
    openai_api_key: str = ""
    lightrag_db_url: str
    lightrag_collection: str = "wolai-docs"
    lightrag_llm_model: str = "qwen3:32b"
    lightrag_embedding_model: str = "qwen3-embedding:8b"
    lightrag_rerank_model: str = "dengcao/Qwen3-Reranker-4B:Q5_K_M"
    ollama_base_url: str = "http://127.0.0.1:11434"
    lightrag_embedding_dim: int = 4096
    deepseek_api_key: str = ""
    deepseek_base_url: str = "https://api.deepseek.com"
    deepseek_model: str = "deepseek-chat"
    searxng_base_url: Optional[str] = None
    searxng_api_token: Optional[str] = None


@lru_cache
def get_settings() -> Settings:
    """惰性实例化设置，避免重复读取文件。"""
    return Settings()


settings = get_settings()