from functools import lru_cache

from pydantic import Field
from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    app_name: str = "AI Knowledge Spine Chunking Service"
    environment: str = "local"
    database_url: str = Field(
        default="postgresql+psycopg://postgres:postgres@localhost:5432/ai_knowledge_spine",
        description="SQLAlchemy database URL for chunking and claim persistence.",
    )

    model_config = SettingsConfigDict(
        env_prefix="AKS_",
        env_file=".env",
        extra="ignore",
    )


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