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import json
import pytest
from unittest.mock import MagicMock, patch
from fastapi.testclient import TestClient
from fastapi import FastAPI
import sys
import os

sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), '../..')))
from backend.data_sources.api import router, get_redis_client, get_tenant_config
from backend.core.auth import AuthUser, get_current_user

app = FastAPI()
app.include_router(router)

def mock_get_current_user():
    return AuthUser({
        "id": "test_user",
        "user_metadata": {"tenant_id": "test_tenant", "role": "user"}
    })

app.dependency_overrides[get_current_user] = mock_get_current_user
client = TestClient(app)

class TestPatchAndDeleteEndpoints:
    @patch('backend.data_sources.api.get_redis_client')
    def test_patch_tenant_source(self, mock_redis):
        mock_redis_instance = MagicMock()
        mock_redis.return_value = mock_redis_instance
        
        # Existing config
        existing_config = [
            {
                "source_name": "old_db",
                "source_type": "ibis",
                "config": {"uri": "postgres://user:pass@localhost:5432/db1", "other": "val"}
            }
        ]
        mock_redis_instance.get.return_value = json.dumps(existing_config)
        
        # Override the dependency for the duration of the request
        app.dependency_overrides[get_redis_client] = lambda: mock_redis_instance
        
        patch_request = {
            "new_source_name": "new_db",
            "config_updates": {"uri": "postgres://user:newpass@localhost:5432/db1"}
        }
        
        response = client.patch("/api/v1/data-sources/my-tenant/sources/old_db?validate_connection=false", json=patch_request)
        
        # Clean up
        app.dependency_overrides.pop(get_redis_client, None)
        
        assert response.status_code == 200
        # Check that set was called with updated config
        mock_redis_instance.set.assert_called_once()
        args, _ = mock_redis_instance.set.call_args
        key, value = args
        assert key == "tenant:test_tenant:config"
        updated_sources = json.loads(value)
        assert len(updated_sources) == 1
        assert updated_sources[0]["source_name"] == "new_db"
        assert updated_sources[0]["config"]["uri"] == "postgres://user:newpass@localhost:5432/db1"
        assert updated_sources[0]["config"]["other"] == "val"  # Ensure config was merged, not replaced

    @patch('backend.data_sources.api.get_redis_client')
    def test_delete_tenant_source_cascades(self, mock_redis):
        mock_redis_instance = MagicMock()
        mock_redis.return_value = mock_redis_instance
        
        existing_config = [{"source_name": "db_to_delete", "config": {}}]
        mock_redis_instance.get.return_value = json.dumps(existing_config)
        
        app.dependency_overrides[get_redis_client] = lambda: mock_redis_instance
        
        response = client.delete("/api/v1/data-sources/my-tenant/sources/db_to_delete")
        
        app.dependency_overrides.pop(get_redis_client, None)
        
        assert response.status_code == 200
        
        # Redis delete should be called for caches
        delete_calls = mock_redis_instance.delete.call_args_list
        assert any(call[0][0] == "schema:test_tenant:db_to_delete" for call in delete_calls)
        assert any(call[0][0] == "instructions:test_tenant:db_to_delete" for call in delete_calls)