"""Unit tests for redis_repository.RedisRepository.

Regression coverage for QA-round-3 B21: user state must live on a dedicated
Redis logical DB (default db3) with all keys prefixed by ``wrongmove:user:``.
"""
from datetime import timedelta
from unittest import mock

import pytest


def _patched_app() -> mock.MagicMock:
    """Return a MagicMock standing in for celery_app.app.broker_connection()."""
    fake_app = mock.MagicMock()
    fake_app.broker_connection.return_value.info.return_value = {
        "hostname": "redis.test",
        "port": 6379,
    }
    return fake_app


class TestRedisRepositoryDbSelection:
    """B21 regression: RedisRepository writes to a dedicated DB (default 3)."""

    def test_defaults_to_db_3(self):
        import redis_repository
        with mock.patch.dict("os.environ", {}, clear=False) as _env:
            _env.pop("REDIS_USER_DB", None)
            with mock.patch.object(redis_repository, "redis") as mock_redis, \
                 mock.patch.object(redis_repository, "app", _patched_app()):
                redis_repository.RedisRepository()

                kwargs = mock_redis.Redis.call_args.kwargs
                assert kwargs["db"] == 3
                assert kwargs["socket_keepalive"] is True
                assert kwargs["health_check_interval"] == 25

    def test_honours_REDIS_USER_DB_env_var(self):
        import redis_repository
        with mock.patch.dict("os.environ", {"REDIS_USER_DB": "7"}):
            with mock.patch.object(redis_repository, "redis") as mock_redis, \
                 mock.patch.object(redis_repository, "app", _patched_app()):
                redis_repository.RedisRepository()

                kwargs = mock_redis.Redis.call_args.kwargs
                assert kwargs["db"] == 7


class TestRedisRepositoryKeyPrefix:
    """B21 regression: all keys written via set_key/get_key are namespaced
    with the ``wrongmove:user:`` prefix to avoid collisions on a shared
    Redis instance."""

    def _fresh_repo(self) -> tuple[object, mock.MagicMock]:
        import redis_repository
        with mock.patch.object(redis_repository, "redis"), \
             mock.patch.object(redis_repository, "app", _patched_app()):
            repo = redis_repository.RedisRepository()
        fake_client = mock.MagicMock()
        repo.redis_client = fake_client
        return repo, fake_client

    def test_set_key_prepends_prefix(self):
        repo, fake_client = self._fresh_repo()
        repo.set_key("webauthn:challenge:abc", {"x": 1})
        # First positional arg to .set is the key.
        set_call_key = fake_client.set.call_args.args[0]
        assert set_call_key == "wrongmove:user:webauthn:challenge:abc"
        # expire uses the same prefixed key.
        expire_call_key = fake_client.expire.call_args.args[0]
        assert expire_call_key == "wrongmove:user:webauthn:challenge:abc"

    def test_get_key_uses_prefix(self):
        repo, fake_client = self._fresh_repo()
        fake_client.get.return_value = '{"hello": "world"}'
        result = repo.get_key("webauthn:challenge:abc")
        fake_client.get.assert_called_once_with(
            "wrongmove:user:webauthn:challenge:abc"
        )
        assert result == {"hello": "world"}

    def test_does_not_double_prefix_already_prefixed_key(self):
        repo, fake_client = self._fresh_repo()
        repo.set_key("wrongmove:user:already-prefixed", {"x": 1})
        set_call_key = fake_client.set.call_args.args[0]
        assert set_call_key == "wrongmove:user:already-prefixed"

    def test_add_task_for_user_uses_prefixed_key(self):
        repo, fake_client = self._fresh_repo()
        fake_client.get.return_value = None  # no prior tasks
        from api.auth import User
        user = User(sub="", email="test@example.com", name="")
        repo.add_task_for_user(user, "task-xyz")
        # The redis SET should target the namespaced key.
        set_call_key = fake_client.set.call_args.args[0]
        assert set_call_key == "wrongmove:user:test@example.com/tasks"