"""Simplified unit tests demonstrating Redis budget cleanup leaks.

These tests should FAIL with the current implementation, demonstrating
scenarios where Redis budget data is not properly cleaned up.
"""

import uuid
from unittest import TestCase
from django.test import tag
from unittest.mock import MagicMock, patch, ANY


@tag("batch_redis_leaks")
class RedisBudgetLeakTests(TestCase):
    """Pure unit tests demonstrating Redis budget leak scenarios."""

    @patch('api.agent.core.budget.get_redis_client')
    def test_close_cycle_does_not_clean_branches(self, mock_get_redis):
        """Test that close_cycle doesn't clean up branch data.
        
        THIS TEST SHOULD FAIL: close_cycle should clean up branches
        but currently doesn't, leaving them in Redis until TTL.
        """
        mock_redis = MagicMock()
        mock_get_redis.return_value = mock_redis
        
        agent_id = str(uuid.uuid4())
        budget_id = str(uuid.uuid4())
        branches_key = f"pa:budget:{agent_id}:branches"
        
        # Setup mock data
        mock_redis.hgetall.return_value = {
            "budget_id": budget_id,
            "status": "active"
        }
        mock_redis.get.return_value = budget_id
        
        from api.agent.core.budget import AgentBudgetManager
        
        # Create some branches
        for i in range(3):
            AgentBudgetManager.create_branch(
                agent_id=agent_id,
                budget_id=budget_id,
                depth=i
            )
        
        # Close the cycle
        AgentBudgetManager.close_cycle(
            agent_id=agent_id,
            budget_id=budget_id
        )
        
        # Check if branches were deleted via pipeline
        pipeline_calls = mock_redis.pipeline.return_value.delete.call_args_list
        
        # ASSERTION: Branches should be cleaned when cycle closes
        branches_deleted = any(
            branches_key == call[0][0] if call[0] else False
            for call in pipeline_calls
        )
        
        self.assertTrue(
            branches_deleted,
            f"Branches key '{branches_key}' should be deleted when cycle closes, "
            "but it wasn't. Branches persist until TTL expires."
        )

    @patch('api.agent.core.event_processing.AgentBudgetManager')
    @patch('api.agent.core.event_processing._should_skip_processing_for_inactive_or_deleted_agent', return_value=False)
    @patch('api.agent.core.event_processing._process_agent_events_locked')
    def test_exception_skips_close_cycle(self, mock_process, _mock_skip, mock_budget_mgr):
        """Test that exceptions in event processing skip close_cycle.
        
        THIS TEST SHOULD FAIL: Exceptions should trigger cleanup
        but currently don't call close_cycle.
        """
        from api.agent.core.event_processing import process_agent_events
        from api.agent.core.budget import BudgetContext
        
        agent_id = str(uuid.uuid4())
        budget_id = str(uuid.uuid4())
        
        # Setup mocks
        mock_process.side_effect = Exception("Processing failed")
        mock_budget_mgr.find_or_start_cycle.return_value = (budget_id, 10, 2)
        mock_budget_mgr.get_cycle_status.return_value = "active"
        
        # Mock the context
        with patch('api.agent.core.event_processing.set_budget_context'):
            with patch('api.agent.core.event_processing.get_redis_client') as mock_redis:
                mock_redis.return_value.get.return_value = None
                mock_redis.return_value.exists.return_value = False
                with patch('api.agent.core.event_processing.Redlock') as mock_lock:
                    mock_lock.return_value.acquire.return_value = True
                    
                    # Call should raise exception
                    with self.assertRaises(Exception):
                        process_agent_events(agent_id)
        
        # Check if close_cycle was called
        close_calls = [
            call for call in mock_budget_mgr.close_cycle.call_args_list
        ]
        
        self.assertGreater(
            len(close_calls), 0,
            "close_cycle should be called even when exception occurs, "
            "but it wasn't. Budget remains active until TTL."
        )

    def test_agent_deletion_cleanup_exists(self):
        """Test that cleanup_redis_budget_data function exists in models.
        
        This test NOW PASSES: We added cleanup_redis_budget_data function
        to clean Redis data when an agent is deleted.
        """
        import api.models
        
        # Check if the cleanup function exists
        has_cleanup = hasattr(api.models, 'cleanup_redis_budget_data')
        
        self.assertTrue(
            has_cleanup,
            "cleanup_redis_budget_data function should exist in api.models "
            "to clean up Redis budget data when PersistentAgent is deleted."
        )

    def test_branch_can_be_individually_removed(self):
        """Test that individual branches can be removed.
        
        This test NOW PASSES: We added a remove_branch method
        to clean up individual branches when needed.
        """
        from api.agent.core.budget import AgentBudgetManager
        
        # Check if there's a method to remove individual branch
        has_remove_branch = hasattr(AgentBudgetManager, 'remove_branch')
        
        self.assertTrue(
            has_remove_branch,
            "remove_branch method should exist to clean up individual branches."
        )

    def test_browser_task_cleanup_implemented(self):
        """Test that browser task failure cleanup code exists.
        
        This test NOW PASSES: We added cleanup code in the finally block
        to remove branches when browser tasks fail.
        """
        # Check that the cleanup implementation exists in the source
        import inspect
        import api.tasks.browser_agent_tasks as tasks_module
        
        # Get the source code of _process_browser_use_task_core
        source = inspect.getsource(tasks_module._process_browser_use_task_core)
        
        # Check that it includes decrement of outstanding-children on completion/failure
        has_cleanup = (
            'bump_branch_depth' in source and '-1' in source
        )
        
        self.assertTrue(
            has_cleanup,
            "Browser task processing should include branch cleanup code "
            "in the finally block to prevent Redis leaks."
        )
