import os
from functools import lru_cache
from pydantic import Field
from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    """FastAPI 配置，统一读取 .env 或系统环境变量"""
    model_config = SettingsConfigDict(env_file=".env", env_file_encoding="utf-8", case_sensitive=False, extra="ignore")

    app_name: str = Field("AIMNOTE Ingest Service", env="INGEST_APP_NAME")
    environment: str = Field("development", env="INGEST_ENV")
    api_prefix: str = "/api"
    supabase_url: str = Field("http://127.0.0.1:54321", env="SUPABASE_URL")
    supabase_key: str = Field("", env="SUPABASE_SERVICE_ROLE_KEY")
    lightrag_url: str = Field("http://127.0.0.1:7777", env="LIGHTRAG_URL")
    lightrag_api_key: str = Field("", env="LIGHTRAG_API_KEY")
    ollama_base_url: str = Field("http://127.0.0.1:11434/v1", env="OLLAMA_BASE_URL")
    ollama_api_key: str = Field("ollama", env="OLLAMA_API_KEY")
    embeddings_model: str = Field("qwen3-embedding:8b", env="EMBEDDING_MODEL")
    llm_model: str = Field("qwen3:32b", env="DEFAULT_LLM_MODEL")
    rerank_model: str = Field("qwen3-reranker-4b", env="RERANK_MODEL")


@lru_cache()
def get_settings() -> Settings:
    return Settings()