"""Server configuration from environment variables."""

from pathlib import Path
from typing import Any
from pydantic_settings import BaseSettings


class Settings(BaseSettings):
    """Application settings loaded from environment variables."""

    data_dir: Path = Path("/data")
    database_url: str = ""

    secret_key: str = "change-me-in-production"

    def model_post_init(self, __context: Any) -> None:
        if self.secret_key == "change-me-in-production" and not self.debug:
            raise ValueError(
                "SECURITY: Cannot start with default secret_key in production. "
                "Set NOTIFY_BRIDGE_SECRET_KEY environment variable."
            )

    access_token_expire_minutes: int = 60
    refresh_token_expire_days: int = 30

    host: str = "0.0.0.0"
    port: int = 8420
    debug: bool = False

    anthropic_api_key: str = ""
    ai_model: str = "claude-sonnet-4-20250514"
    ai_max_tokens: int = 1024

    telegram_webhook_secret: str = ""

    model_config = {"env_prefix": "NOTIFY_BRIDGE_"}

    @property
    def effective_database_url(self) -> str:
        if self.database_url:
            return self.database_url
        db_path = self.data_dir / "notify_bridge.db"
        return f"sqlite+aiosqlite:///{db_path}"


settings = Settings()