"""
Security edge case tests for xSystem.

Company: eXonware.com
Author: Eng. Muhammad AlShehri
Email: connect@exonware.com
Version: 0.0.1
Generation Date: August 31, 2025
"""

import pytest
from pathlib import Path
import tempfile
import os

from exonware.xwsystem.security import PathValidator, PathSecurityError, ResourceLimits


@pytest.mark.xwsystem_security
class TestPathValidatorEdgeCases:
    """Test edge cases for path validation."""
    
    def test_path_traversal_attacks(self):
        """Test various path traversal attack patterns."""
        validator = PathValidator()
        
        attack_patterns = [
            "../../../etc/passwd",
            "..\\..\\windows\\system32",
            "/../../root/.ssh/id_rsa",
            "....//....//etc/passwd",
            "%2e%2e%2f%2e%2e%2f",
            "..%c0%af..%c0%af",
        ]
        
        for pattern in attack_patterns:
            with pytest.raises(PathSecurityError):
                validator.validate_path(pattern)
    
    def test_null_byte_injection(self):
        """Test null byte injection attempts."""
        validator = PathValidator()
        
        with pytest.raises(PathSecurityError):
            validator.validate_path("safe_file.txt\x00../../../etc/passwd")
    
    def test_extremely_long_paths(self):
        """Test handling of extremely long paths."""
        validator = PathValidator()
        
        # Create a path longer than most filesystem limits
        long_path = "a" * 10000
        with pytest.raises(PathSecurityError):
            validator.validate_path(long_path)


@pytest.mark.xwsystem_security
class TestResourceLimitsEdgeCases:
    """Test edge cases for resource limiting."""
    
    def test_memory_bomb_protection(self):
        """Test protection against memory bombs."""
        limiter = ResourceLimits(max_depth=10, max_resources=100)
        
        # This should be caught by resource limiting
        with pytest.raises(Exception):
            limiter.check_depth(15)  # Exceeds max_depth
    
    def test_concurrent_resource_exhaustion(self):
        """Test concurrent resource exhaustion attempts."""
        limiter = ResourceLimits(max_resources=5)
        
        # Simulate many concurrent operations
        for i in range(10):
            try:
                limiter.increment_resource_count()
            except Exception:
                # Expected to fail after 5 operations
                break


@pytest.mark.xwsystem_security
class TestSecurityIntegration:
    """Integration tests for security components."""
    
    def test_combined_path_and_resource_validation(self):
        """Test combined path and resource validation."""
        validator = PathValidator()
        limiter = ResourceLimits()
        
        with tempfile.TemporaryDirectory() as tmpdir:
            safe_path = Path(tmpdir) / "safe_file.txt"
            
            # Should pass all validations
            validated_path = validator.validate_path(str(safe_path))
            assert validated_path is not None
    
    def test_security_bypass_attempts(self):
        """Test various security bypass attempts."""
        validator = PathValidator()
        
        bypass_attempts = [
            "file:///etc/passwd",
            "http://evil.com/../../etc/passwd",
            "\\\\network\\share\\..\\..\\sensitive",
        ]
        
        for attempt in bypass_attempts:
            with pytest.raises(PathSecurityError):
                validator.validate_path(attempt)
