"""Unit tests for JellyfinClient user-id resolution.

Jellyfin's ``/Users/{id}/...`` endpoints require the internal user Id (a hash),
not the username. The service ``user_id`` config field accepts either form, so
``resolve_user_id`` must turn a username like ``'admin'`` into the real Id before
any user-scoped call. See clients/jellyfin.py.
"""

from __future__ import annotations

import unittest
from unittest.mock import patch

from media_library_viewer_api.clients.jellyfin import JellyfinClient


class ResolveUserIdTests(unittest.TestCase):
    def _client(self) -> JellyfinClient:
        return JellyfinClient("https://jf.example.com", "api-key")

    def test_returns_identifier_when_it_matches_an_internal_id(self) -> None:
        users = [{"Id": "a1b2", "Name": "admin"}, {"Id": "c3d4", "Name": "friend"}]
        with patch.object(JellyfinClient, "users", return_value=users):
            self.assertEqual(self._client().resolve_user_id("c3d4"), "c3d4")

    def test_resolves_username_to_internal_id(self) -> None:
        """Regression: a configured username 'admin' must resolve to the internal Id.

        Hitting /Users/admin/Views directly returns HTTP 400
        ('The value 'admin' is not valid.'), so the username form must be resolved.
        """
        users = [{"Id": "a1b2c3internal", "Name": "admin"}, {"Id": "zzz", "Name": "other"}]
        with patch.object(JellyfinClient, "users", return_value=users):
            self.assertEqual(self._client().resolve_user_id("admin"), "a1b2c3internal")

    def test_falls_back_to_first_user_when_identifier_unknown(self) -> None:
        users = [{"Id": "first", "Name": "admin"}, {"Id": "second", "Name": "x"}]
        with patch.object(JellyfinClient, "users", return_value=users):
            self.assertEqual(self._client().resolve_user_id("nobody"), "first")

    def test_falls_back_to_first_user_when_identifier_none(self) -> None:
        users = [{"Id": "first", "Name": "admin"}]
        with patch.object(JellyfinClient, "users", return_value=users):
            self.assertEqual(self._client().resolve_user_id(None), "first")

    def test_raises_when_no_users_visible(self) -> None:
        with patch.object(JellyfinClient, "users", return_value=[]):
            with self.assertRaises(RuntimeError):
                self._client().resolve_user_id("admin")


if __name__ == "__main__":
    unittest.main()
