//! Security-focused error handling tests
//! Tests error cases for unwrap/expect scenarios in critical paths

#[cfg(test)]
mod p2p_error_handling_tests {
    use super::*;

    #[test]
    fn test_registry_build_with_invalid_config() {
        // Test that registry builder handles invalid configuration gracefully
        let result = P2PRegistryBuilder::new()
            .with_port(0) // Invalid port
            .build();
        
        assert!(result.is_err(), "Should fail with invalid port");
        assert!(result.unwrap_err().to_string().contains("invalid port"));
    }

    #[tokio::test]
    async fn test_registry_start_failure_recovery() {
        // Test registry start failure handling
        let registry = P2PRegistryBuilder::new()
            .with_port(80) // Requires root privileges
            .build()
            .unwrap();
        
        let result = registry.start().await;
        assert!(result.is_err(), "Should fail without root privileges");
    }

    #[tokio::test]
    async fn test_protocol_send_request_timeout() {
        // Test protocol request timeout handling
        let mut protocol = Protocol::new();
        let request = Request::new("test");
        
        let result = protocol.send_request_with_timeout(
            request,
            "nonexistent-peer".to_string(),
            Duration::from_millis(100)
        ).await;
        
        assert!(result.is_err(), "Should timeout for nonexistent peer");
    }

    #[test]
    fn test_publish_package_network_error() {
        // Test package publishing with network failure
        let mut behaviour = NetworkBehaviour::new();
        let package = create_test_package();
        
        // Simulate network disconnect
        behaviour.disconnect_network();
        
        let result = behaviour.publish_package(package);
        assert!(result.is_err(), "Should fail when network is disconnected");
    }

    #[tokio::test]
    async fn test_search_packages_malformed_query() {
        // Test search with malformed query
        let behaviour = NetworkBehaviour::new();
        let malformed_query = ""; // Empty query
        
        let result = behaviour.search_packages(malformed_query);
        assert!(result.is_err(), "Should reject empty search query");
    }

    #[tokio::test]
    async fn test_discovery_network_partition() {
        // Test peer discovery during network partition
        let mut discovery = Discovery::new();
        
        // Simulate network partition
        discovery.simulate_partition();
        
        let result = discovery.discover().await;
        assert!(
            result.is_err() || result.unwrap().is_empty(),
            "Should handle network partition gracefully"
        );
    }
}

#[cfg(test)]
mod path_traversal_tests {
    use super::*;

    #[test]
    fn test_path_traversal_prevention() {
        let dangerous_paths = vec![
            "../etc/passwd",
            "../../sensitive/data",
            "/etc/../etc/passwd",
            "templates/../../config",
            "data/../../../root",
        ];

        for path in dangerous_paths {
            let result = validate_file_path(path);
            assert!(
                result.is_err(),
                "Should reject path traversal attempt: {}",
                path
            );
        }
    }

    #[test]
    fn test_path_length_limits() {
        // Test maximum path length enforcement
        let long_path = "a/".repeat(500); // 1000 chars
        let too_long_path = "a/".repeat(501); // 1002 chars

        assert!(validate_file_path(&long_path).is_ok());
        assert!(validate_file_path(&too_long_path).is_err());
    }

    #[test]
    fn test_path_character_validation() {
        let invalid_paths = vec![
            "path/with/null\0byte",
            "path/with/<redirect>",
            "path/with/|pipe",
            "path/with/;semicolon",
            "path/with/`backtick",
        ];

        for path in invalid_paths {
            let result = validate_file_path(path);
            assert!(
                result.is_err(),
                "Should reject path with invalid characters: {}",
                path
            );
        }
    }

    #[test]
    fn test_absolute_path_handling() {
        // Test that absolute paths are handled safely
        let absolute_paths = vec![
            "/etc/passwd",
            "/var/log/system.log",
            "C:\\Windows\\System32",
        ];

        for path in absolute_paths {
            let result = validate_file_path(path);
            // Policy: absolute paths should be rejected or carefully validated
            // Adjust based on your security policy
            println!("Absolute path '{}': {:?}", path, result);
        }
    }
}

#[cfg(test)]
mod input_validation_tests {
    use super::*;

    #[test]
    fn test_project_name_injection() {
        let malicious_names = vec![
            "../../../etc",
            "../../sensitive",
            "name;rm -rf /",
            "name$(whoami)",
            "name`id`",
            "name|cat /etc/passwd",
        ];

        for name in malicious_names {
            let result = validate_project_name(name);
            assert!(
                result.is_err(),
                "Should reject malicious project name: {}",
                name
            );
        }
    }

    #[test]
    fn test_format_validation() {
        let invalid_formats = vec![
            "",
            " ",
            "../../file.txt",
            "format;injection",
            "format`whoami`",
        ];

        for format in invalid_formats {
            let result = validate_format(&Some(format.to_string()));
            assert!(
                result.is_err(),
                "Should reject invalid format: {}",
                format
            );
        }
    }

    #[test]
    fn test_input_length_limits() {
        // Test various input length limits
        let max_name_length = 100;
        let max_format_length = 50;

        let long_name = "a".repeat(max_name_length + 1);
        let long_format = "a".repeat(max_format_length + 1);

        assert!(validate_project_name(&long_name).is_err());
        assert!(validate_format(&Some(long_format)).is_err());
    }
}

#[cfg(test)]
mod mock_registry_error_tests {
    use super::*;

    #[test]
    fn test_mock_registry_initialization_failure() {
        // Test mock registry with invalid configuration
        std::env::set_var("MOCK_FAIL_INIT", "true");
        
        let result = MockGitHubRegistry::new();
        assert!(result.is_err(), "Should fail when MOCK_FAIL_INIT is set");
        
        std::env::remove_var("MOCK_FAIL_INIT");
    }

    #[test]
    fn test_index_content_corruption() {
        let registry = MockGitHubRegistry::new().unwrap();
        
        // Corrupt the index file
        registry.corrupt_index();
        
        let result = registry.index_content();
        assert!(result.is_err(), "Should fail with corrupted index");
    }

    #[test]
    fn test_create_mock_gpack_invalid_id() {
        let registry = MockGitHubRegistry::new().unwrap();
        
        let result = registry.create_mock_gpack("", "1.0.0");
        assert!(result.is_err(), "Should reject empty gpack ID");
        
        let result = registry.create_mock_gpack("../../../etc", "1.0.0");
        assert!(result.is_err(), "Should reject path traversal in gpack ID");
    }

    #[test]
    fn test_update_index_malformed_data() {
        let registry = MockGitHubRegistry::new().unwrap();
        
        let malformed_json = serde_json::json!({
            "invalid": "structure",
            "missing": "required_fields"
        });
        
        let result = registry.update_index(malformed_json);
        assert!(result.is_err(), "Should reject malformed index data");
    }
}

// Helper functions for creating test data
fn create_test_package() -> Package {
    Package {
        id: "test-package".to_string(),
        version: "1.0.0".to_string(),
        description: "Test package".to_string(),
    }
}

// Mock implementations for testing (would be in actual test module)
impl NetworkBehaviour {
    fn disconnect_network(&mut self) {
        // Simulate network disconnect
    }
}

impl Discovery {
    fn simulate_partition(&mut self) {
        // Simulate network partition
    }
}

impl MockGitHubRegistry {
    fn corrupt_index(&self) {
        // Simulate index corruption
    }
}
