"""Application configuration via pydantic-settings."""

from pydantic_settings import BaseSettings
from functools import lru_cache


class Settings(BaseSettings):
    # App
    APP_NAME: str = "AGP Backend"
    APP_VERSION: str = "0.1.0"
    DEBUG: bool = True

    # Database (async)
    DATABASE_URL: str = "postgresql+asyncpg://agp_user:agp_password@localhost:5432/agp_db"

    # Redis
    REDIS_URL: str = "redis://localhost:6379/0"

    # JWT / Auth
    SECRET_KEY: str = "change-me-to-a-secure-random-string"
    ALGORITHM: str = "HS256"
    ACCESS_TOKEN_EXPIRE_MINUTES: int = 30

    # CORS
    CORS_ORIGINS: str = "http://localhost:8080,http://localhost:3000"

    # File uploads
    UPLOAD_DIR: str = "uploads"
    MAX_UPLOAD_SIZE_MB: int = 100

    @property
    def cors_origins_list(self) -> list[str]:
        return [origin.strip() for origin in self.CORS_ORIGINS.split(",")]

    class Config:
        env_file = ".env"
        env_file_encoding = "utf-8"
        case_sensitive = True


@lru_cache()
def get_settings() -> Settings:
    """Return cached settings instance."""
    return Settings()


# Convenience singleton
settings = get_settings()