"""Backend configuration using pydantic-settings.

Reads from environment variables and .env file automatically.
Uses a flat settings model so that standard env vars like SSH_HOST,
JELLYFIN_URL etc. are picked up directly without nested-model complications.
"""

from __future__ import annotations

from functools import lru_cache
from pathlib import Path

from pydantic_settings import BaseSettings


class Settings(BaseSettings):
    """Flat application settings read from env vars / .env file."""

    # Jellyfin
    jellyfin_url: str = ""
    jellyfin_api_key: str = ""
    jellyfin_user_id: str = ""

    # SSH
    ssh_host: str = ""
    ssh_username: str = ""
    ssh_port: int = 22
    ssh_key_filename: str = str(Path.home() / ".ssh" / "id_rsa")
    ssh_password: str = ""

    # Remote paths
    remote_media_root: str = ""
    remote_path_prefix: str = ""

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

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

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


def _find_env_file() -> str | None:
    """Look for .env in CWD, then parent directories up to the repo root."""
    current = Path.cwd()
    for directory in [current, *current.parents]:
        candidate = directory / ".env"
        if candidate.is_file():
            return str(candidate)
        # Stop at repo root (has .git)
        if (directory / ".git").exists():
            break
    return None


@lru_cache
def get_settings() -> Settings:
    """Return a cached Settings instance."""
    env_file = _find_env_file()
    if env_file:
        return Settings(_env_file=env_file)
    return Settings()