from functools import lru_cache

from pydantic import Field
from pydantic_settings import BaseSettings, SettingsConfigDict


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

    mongo_uri: str = Field(..., alias="MONGO_URI")
    mongo_db: str = Field("expense", alias="MONGO_DB")
    mongo_collection: str = Field("headcategories", alias="MONGO_COLLECTION")
    mongo_subcategory_collection: str = Field("categories", alias="MONGO_SUBCATEGORY_COLLECTION")
    api_logs_collection: str = Field("api_logs", alias="MONGO_API_LOGS_COLLECTION")

    openai_api_key: str = Field(..., alias="OPENAI_API_KEY")
    openai_model: str = Field("gpt-4o-mini", alias="OPENAI_MODEL")

    category_cache_ttl_seconds: int = Field(300, alias="CATEGORY_CACHE_TTL")
    use_static_categories: bool = Field(True, alias="USE_STATIC_CATEGORIES")


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


settings = get_settings()