from functools import lru_cache

from pydantic import Field
from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    app_name: str = "AI Palm Reading"
    environment: str = "development"
    database_url: str = "sqlite+aiosqlite:///./palm_reading.db"
    secret_key: str = "change-me-in-production"
    access_token_expire_minutes: int = 60 * 24 * 30
    cors_origins: list[str] = Field(default_factory=lambda: ["*"])
    daily_reading_limit: int = 5

    openai_api_key: str | None = None
    openai_base_url: str | None = None
    openai_model: str = "gpt-4.1-mini"
    openai_image_model: str = "gpt-image-2"
    openai_timeout_seconds: float = 180
    share_image_mode: str = "ai"

    wechat_app_id: str | None = None
    wechat_app_secret: str | None = None
    wechat_mock_login: bool = True

    upload_dir: str = "./storage/uploads"
    image_retention_days: int = 7
    max_image_mb: int = 8

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


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


settings = get_settings()