import os
import sys

sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
"""
Edge case and error condition tests for API Gateway.
Constitutional Hash: cdd01ef066bc6cf2
"""

from unittest.mock import patch


class TestEdgeCases:
    """Test edge cases and boundary conditions."""

    def test_very_large_feedback_payload(self, client):
        """Test handling of very large feedback payloads."""
        # Create a large feedback payload
        large_description = "x" * 10000  # 10KB description
        large_feedback = {
            "user_id": "test-user",
            "category": "general",
            "rating": 5,
            "title": "Large feedback test",
            "description": large_description,
            "metadata": {"size": "large", "test": True},
        }

        response = client.post("/feedback", json=large_feedback)
        # Should handle large payloads gracefully
        assert response.status_code in [200, 413]  # 200 OK or 413 Payload Too Large

        if response.status_code == 200:
            data = response.json()
            assert "feedback_id" in data

    def test_special_characters_in_feedback(self, client):
        """Test feedback with special characters and unicode."""
        special_feedback = {
            "user_id": "test-user-🚀",
            "category": "bug",
            "rating": 3,
            "title": "Special chars: àáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþÿ",
            "description": "Unicode test: 🌟⭐✨💫🎉",
            "metadata": {
                "special": "chars",
                "json": {"nested": {"value": 123}},
                "array": [1, 2, "three"],
            },
        }

        response = client.post("/feedback", json=special_feedback)
        assert response.status_code == 200

        data = response.json()
        assert "feedback_id" in data

    def test_concurrent_requests(self, client, sample_feedback):
        """Test handling of concurrent requests."""
        import asyncio

        import httpx

        async def make_request():
            async with httpx.AsyncClient(
                app=client.app, base_url="http://testserver"
            ) as async_client:
                response = await async_client.post("/feedback", json=sample_feedback)
                return response.status_code

        async def run_concurrent_requests():
            tasks = [make_request() for _ in range(10)]
            results = await asyncio.gather(*tasks)
            return results

        # Run concurrent requests
        results = asyncio.run(run_concurrent_requests())

        # All should succeed
        assert all(status == 200 for status in results)

    def test_rapid_succession_requests(self, client, sample_feedback):
        """Test rapid succession of requests."""
        # Make many requests in quick succession
        responses = []
        for i in range(20):
            feedback = sample_feedback.copy()
            feedback["title"] = f"Request {i + 1}"
            response = client.post("/feedback", json=feedback)
            responses.append(response.status_code)

        # All should succeed
        assert all(status == 200 for status in responses)

        # Check that we can still get metrics
        metrics_response = client.get("/metrics")
        assert metrics_response.status_code == 200


class TestInputValidation:
    """Test input validation edge cases."""

    def test_empty_feedback_fields(self, client):
        """Test feedback with empty but required fields."""
        # Empty strings for required fields
        empty_feedback = {
            "user_id": "",
            "category": "",
            "rating": 3,
            "title": "",
            "description": "",
        }

        response = client.post("/feedback", json=empty_feedback)
        # Should validate and potentially reject
        assert response.status_code in [200, 422]  # May accept or validate

    def test_null_values_in_feedback(self, client):
        """Test feedback with null values."""
        null_feedback = {
            "user_id": None,
            "category": "bug",
            "rating": 3,
            "title": "Null test",
            "description": "Testing null values",
            "metadata": None,
        }

        response = client.post("/feedback", json=null_feedback)
        # Should handle nulls appropriately
        assert response.status_code in [200, 422]

    def test_extremely_long_strings(self, client):
        """Test with extremely long string values."""
        long_string = "a" * 100000  # 100KB string
        long_feedback = {
            "user_id": "test-user",
            "category": "general",
            "rating": 5,
            "title": long_string[:100],  # Truncate title
            "description": long_string,
            "metadata": {"long_field": long_string},
        }

        response = client.post("/feedback", json=long_feedback)
        # Should handle gracefully
        assert response.status_code in [200, 413, 422]

    def test_nested_metadata_structures(self, client):
        """Test complex nested metadata structures."""
        complex_metadata = {
            "user_id": "test-user",
            "category": "feature",
            "rating": 4,
            "title": "Complex metadata test",
            "description": "Testing nested structures",
            "metadata": {
                "deeply": {
                    "nested": {
                        "structure": {
                            "with": ["arrays", "and", {"objects": "inside"}],
                            "numbers": [1, 2, 3, {"four": 4}],
                            "booleans": [True, False, None],
                        }
                    }
                },
                "performance": {"load_time": 1.23, "memory_usage": 45.67, "cpu_percent": 12.34},
            },
        }

        response = client.post("/feedback", json=complex_metadata)
        assert response.status_code == 200

        data = response.json()
        assert "feedback_id" in data


class TestNetworkConditions:
    """Test various network and connectivity conditions."""

    @patch("main.httpx.AsyncClient")
    def test_proxy_connection_timeout(self, mock_httpx_client, client):
        """Test proxy timeout handling."""
        from httpx import TimeoutException

        mock_httpx_client.side_effect = TimeoutException("Connection timed out")

        response = client.get("/api/v1/test-endpoint")
        assert response.status_code == 502
        assert "Service unavailable" in response.json()["detail"]

    @patch("main.httpx.AsyncClient")
    def test_proxy_connection_refused(self, mock_httpx_client, client):
        """Test proxy connection refused handling."""
        from httpx import ConnectError

        mock_httpx_client.side_effect = ConnectError("Connection refused")

        response = client.get("/api/v1/test-endpoint")
        assert response.status_code == 502

    @patch("main.httpx.AsyncClient")
    def test_proxy_dns_failure(self, mock_httpx_client, client):
        """Test proxy DNS resolution failure."""
        from httpx import ConnectError

        mock_httpx_client.side_effect = ConnectError("Name resolution failure")

        response = client.get("/api/v1/test-endpoint")
        assert response.status_code == 502

    @patch("main.httpx.AsyncClient")
    def test_proxy_ssl_verification_failure(self, mock_httpx_client, client):
        """Test proxy SSL verification failure."""
        from httpx import SSLError

        mock_httpx_client.side_effect = SSLError("SSL verification failed")

        response = client.get("/api/v1/test-endpoint")
        assert response.status_code == 502


class TestResourceLimits:
    """Test resource limit handling."""

    def test_request_size_limits(self, client):
        """Test handling of various request sizes."""
        # Test with different payload sizes
        sizes = [100, 1000, 10000, 50000]

        for size in sizes:
            large_payload = {
                "user_id": "test-user",
                "category": "general",
                "rating": 3,
                "title": f"Size test {size}",
                "description": "x" * size,
                "metadata": {"size": size},
            }

            response = client.post("/feedback", json=large_payload)
            # Should handle various sizes
            assert response.status_code in [200, 413, 422]

    def test_many_concurrent_connections(self, client, sample_feedback):
        """Test handling of many concurrent connections."""
        import threading

        results = []
        errors = []

        def make_request(request_id):
            try:
                response = client.post(
                    "/feedback", json={**sample_feedback, "title": f"Concurrent {request_id}"}
                )
                results.append((request_id, response.status_code))
            except Exception as e:
                errors.append((request_id, str(e)))

        # Start multiple threads
        threads = []
        for i in range(50):  # Many concurrent requests
            thread = threading.Thread(target=make_request, args=(i,))
            threads.append(thread)
            thread.start()

        # Wait for all to complete
        for thread in threads:
            thread.join(timeout=10)

        # Should handle the load
        successful_requests = len([r for r in results if r[1] == 200])
        total_requests = len(results)

        # At least some should succeed
        assert successful_requests > 0
        assert len(errors) == 0 or len(errors) < total_requests * 0.1  # Less than 10% errors


class TestMetricsUnderLoad:
    """Test metrics collection under various load conditions."""

    def test_metrics_collection_during_load(self, client, sample_feedback):
        """Test that metrics are collected properly during load."""
        # Generate some load
        for i in range(10):
            feedback = sample_feedback.copy()
            feedback["title"] = f"Load test {i + 1}"
            response = client.post("/feedback", json=feedback)
            assert response.status_code == 200

        # Metrics should still be accessible
        metrics_response = client.get("/metrics")
        assert metrics_response.status_code == 200

        content = metrics_response.text
        # Should contain some metrics data
        assert len(content) > 100  # Reasonable minimum content length

    def test_metrics_after_errors(self, client):
        """Test metrics collection after error conditions."""
        # Generate some errors
        for _ in range(5):
            response = client.get("/nonexistent-endpoint")
            assert response.status_code == 404

        # Then some successes
        for _ in range(3):
            response = client.get("/health")
            assert response.status_code == 200

        # Metrics should reflect both
        metrics_response = client.get("/metrics")
        assert metrics_response.status_code == 200
