"""Backend configuration using pydantic-settings.

Reads from environment variables and .env file automatically.
"""

from __future__ import annotations

from pathlib import Path

from pydantic_settings import BaseSettings


class JellyfinSettings(BaseSettings):
    url: str = ""
    api_key: str = ""
    user_id: str = ""

    model_config = {"env_prefix": "JELLYFIN_"}


class SSHSettings(BaseSettings):
    host: str = ""
    username: str = ""
    port: int = 22
    key_filename: str = str(Path.home() / ".ssh" / "id_rsa")
    password: str = ""
    media_root: str = ""
    path_prefix: str = ""

    model_config = {"env_prefix": "SSH_"}


class RemoteSettings(BaseSettings):
    """Extra remote settings that don't fit the SSH_ prefix."""

    media_root: str = ""
    path_prefix: str = ""

    model_config = {"env_prefix": "REMOTE_"}


class Settings(BaseSettings):
    """Top-level application settings."""

    jellyfin: JellyfinSettings = JellyfinSettings()
    ssh: SSHSettings = SSHSettings()
    remote: RemoteSettings = RemoteSettings()

    # Derived convenience properties
    @property
    def media_root(self) -> str:
        return self.remote.media_root or self.ssh.media_root or ""

    @property
    def path_prefix(self) -> str:
        return self.remote.path_prefix or self.ssh.path_prefix or ""

    model_config = {"env_file": ".env", "env_file_encoding": "utf-8", "extra": "ignore"}


def get_settings() -> Settings:
    """Create a Settings instance (reads env/.env on each call)."""
    return Settings()