wasm-sandbox 0.4.1

//! Python language bindings module
//! 
//! This module provides Python language bindings for the wasm-sandbox,
//! allowing Python developers to use the sandbox functionality.

use std::path::{Path, PathBuf};
use crate::error::Result;

/// Python bindings generator for wasm-sandbox
pub struct PythonBindings {
    /// Output directory for generated bindings
    output_dir: PathBuf,
    
    /// Package name for the Python bindings
    package_name: String,
    
    /// Version for the Python bindings
    version: String,
    
    /// Python minimum version requirement
    min_python_version: String,
    
    /// Additional dependencies
    dependencies: Vec<String>,
}

impl PythonBindings {
    /// Create a new Python bindings generator
    pub fn new(output_dir: impl AsRef<Path>) -> Self {
        Self {
            output_dir: output_dir.as_ref().to_path_buf(),
            package_name: "wasm_sandbox".to_string(),
            version: env!("CARGO_PKG_VERSION").to_string(),
            min_python_version: "3.8".to_string(),
            dependencies: vec![
                "cffi>=1.15.0".to_string(),
                "pydantic>=2.0.0".to_string(),
            ],
        }
    }
    
    /// Set the package name
    pub fn with_package_name(mut self, name: impl Into<String>) -> Self {
        self.package_name = name.into();
        self
    }
    
    /// Set the version
    pub fn with_version(mut self, version: impl Into<String>) -> Self {
        self.version = version.into();
        self
    }
    
    /// Set the minimum Python version
    pub fn with_min_python_version(mut self, version: impl Into<String>) -> Self {
        self.min_python_version = version.into();
        self
    }
    
    /// Add a dependency
    pub fn add_dependency(mut self, dependency: impl Into<String>) -> Self {
        self.dependencies.push(dependency.into());
        self
    }
    
    /// Generate Python bindings
    pub fn generate(&self) -> Result<()> {
        // Create output directory
        std::fs::create_dir_all(&self.output_dir)?;
        
        // Generate Python package structure
        self.generate_package_structure()?;
        
        // Generate core bindings
        self.generate_core_bindings()?;
        
        // Generate setup.py
        self.generate_setup_py()?;
        
        // Generate README.md
        self.generate_readme()?;
        
        // Generate pyproject.toml
        self.generate_pyproject_toml()?;
        
        Ok(())
    }
    
    /// Generate Python package structure
    fn generate_package_structure(&self) -> Result<()> {
        // Create package directory
        let package_dir = self.output_dir.join(&self.package_name);
        std::fs::create_dir_all(&package_dir)?;
        
        // Create __init__.py
        let init_content = self.generate_init_py_content();
        std::fs::write(package_dir.join("__init__.py"), init_content)?;
        
        // Create submodules
        let modules = ["sandbox", "security", "communication", "utils"];
        for module in &modules {
            let module_dir = package_dir.join(module);
            std::fs::create_dir_all(&module_dir)?;
            
            // Create module __init__.py
            let module_init_content = format!("# {} module\n\n", module);
            std::fs::write(module_dir.join("__init__.py"), module_init_content)?;
        }
        
        Ok(())
    }
    
    /// Generate core bindings
    fn generate_core_bindings(&self) -> Result<()> {
        // Core sandbox module
        let sandbox_module_path = self.output_dir
            .join(&self.package_name)
            .join("sandbox")
            .join("sandbox.py");
            
        let sandbox_content = r#"
import os
import json
import time
from typing import Any, Dict, List, Optional, TypeVar, Generic, Union
from pathlib import Path

from .._native import lib as native_lib
from ..security import Capabilities, ResourceLimits

T = TypeVar('T')
R = TypeVar('R')

class WasmSandbox:
    """WebAssembly sandbox for secure code execution"""
    
    def __init__(self):
        """Initialize a new sandbox with default settings"""
        self._handle = native_lib.sandbox_new()
        if not self._handle:
            raise RuntimeError("Failed to create sandbox")
    
    def __del__(self):
        """Clean up sandbox resources"""
        if hasattr(self, '_handle') and self._handle:
            native_lib.sandbox_free(self._handle)
            
    @classmethod
    def builder(cls):
        """Create a sandbox builder for customized configuration"""
        return SandboxBuilder()
            
    @classmethod
    def from_source(cls, source_path: Union[str, Path]):
        """Create a sandbox from source code"""
        sandbox = cls()
        source_path_str = str(source_path)
        result = native_lib.sandbox_load_from_source(sandbox._handle, source_path_str)
        if result != 0:
            error_msg = native_lib.get_last_error()
            raise RuntimeError(f"Failed to load from source: {error_msg}")
        return sandbox
    
    def load_module(self, wasm_bytes: bytes):
        """Load a WebAssembly module from bytes"""
        module_id = native_lib.sandbox_load_module(self._handle, wasm_bytes, len(wasm_bytes))
        if not module_id:
            error_msg = native_lib.get_last_error()
            raise RuntimeError(f"Failed to load module: {error_msg}")
        return module_id
    
    def call(self, function_name: str, params: Any) -> Any:
        """Call a function in the sandbox"""
        # Serialize params to JSON
        params_json = json.dumps(params)
        
        # Call the function
        result_ptr = native_lib.sandbox_call_function(
            self._handle, 
            function_name.encode('utf-8'), 
            params_json.encode('utf-8')
        )
        
        if not result_ptr:
            error_msg = native_lib.get_last_error()
            raise RuntimeError(f"Function call failed: {error_msg}")
        
        # Get the result
        result_json = native_lib.get_result_json(result_ptr).decode('utf-8')
        native_lib.free_result(result_ptr)
        
        # Parse and return the result
        return json.loads(result_json)


class SandboxBuilder:
    """Builder for configuring and creating WasmSandbox instances"""
    
    def __init__(self):
        """Initialize the builder with default settings"""
        self._handle = native_lib.sandbox_builder_new()
        if not self._handle:
            raise RuntimeError("Failed to create sandbox builder")
    
    def __del__(self):
        """Clean up builder resources"""
        if hasattr(self, '_handle') and self._handle:
            native_lib.sandbox_builder_free(self._handle)
    
    def source(self, path: Union[str, Path]):
        """Set the source code path"""
        native_lib.sandbox_builder_source(self._handle, str(path).encode('utf-8'))
        return self
    
    def timeout_duration(self, duration_seconds: float):
        """Set the execution timeout duration"""
        native_lib.sandbox_builder_timeout(self._handle, int(duration_seconds * 1000))
        return self
    
    def memory_limit(self, limit_bytes: int):
        """Set the memory limit in bytes"""
        native_lib.sandbox_builder_memory_limit(self._handle, limit_bytes)
        return self
    
    def enable_file_access(self, enabled: bool):
        """Enable or disable file system access"""
        native_lib.sandbox_builder_file_access(self._handle, 1 if enabled else 0)
        return self
    
    def enable_network(self, enabled: bool):
        """Enable or disable network access"""
        native_lib.sandbox_builder_network(self._handle, 1 if enabled else 0)
        return self
    
    def build(self):
        """Build the sandbox with the configured settings"""
        sandbox_handle = native_lib.sandbox_builder_build(self._handle)
        if not sandbox_handle:
            error_msg = native_lib.get_last_error()
            raise RuntimeError(f"Failed to build sandbox: {error_msg}")
        
        sandbox = WasmSandbox.__new__(WasmSandbox)
        sandbox._handle = sandbox_handle
        return sandbox


def run(source_path: Union[str, Path], function_name: str, params: Any) -> Any:
    """Run a function in a sandbox with default settings"""
    sandbox = WasmSandbox.from_source(source_path)
    return sandbox.call(function_name, params)


def run_with_timeout(
    source_path: Union[str, Path], 
    function_name: str, 
    params: Any, 
    timeout_seconds: float
) -> Any:
    """Run a function in a sandbox with a timeout"""
    sandbox = WasmSandbox.builder() \
        .source(source_path) \
        .timeout_duration(timeout_seconds) \
        .build()
    return sandbox.call(function_name, params)
"#;
        std::fs::write(sandbox_module_path, sandbox_content)?;
        
        // Native bindings module
        let native_module_path = self.output_dir
            .join(&self.package_name)
            .join("_native.py");
            
        let native_content = r#"
import os
import platform
import sys
from cffi import FFI

ffi = FFI()
ffi.cdef("""
    // Sandbox functions
    void* sandbox_new(void);
    void sandbox_free(void* sandbox);
    int sandbox_load_from_source(void* sandbox, const char* source_path);
    const char* sandbox_load_module(void* sandbox, const void* wasm_bytes, size_t wasm_len);
    void* sandbox_call_function(void* sandbox, const char* function_name, const char* params_json);
    
    // Builder functions
    void* sandbox_builder_new(void);
    void sandbox_builder_free(void* builder);
    void sandbox_builder_source(void* builder, const char* source_path);
    void sandbox_builder_timeout(void* builder, unsigned int timeout_ms);
    void sandbox_builder_memory_limit(void* builder, size_t limit_bytes);
    void sandbox_builder_file_access(void* builder, int enabled);
    void sandbox_builder_network(void* builder, int enabled);
    void* sandbox_builder_build(void* builder);
    
    // Result handling
    const char* get_result_json(void* result);
    void free_result(void* result);
    
    // Error handling
    const char* get_last_error(void);
""")

# Determine the shared library name based on platform
if platform.system() == "Windows":
    lib_name = "wasm_sandbox_python.dll"
elif platform.system() == "Darwin":
    lib_name = "libwasm_sandbox_python.dylib"
else:
    lib_name = "libwasm_sandbox_python.so"

# Try to find the library
lib_paths = [
    # Current directory
    os.path.dirname(os.path.abspath(__file__)),
    # Parent directory
    os.path.dirname(os.path.dirname(os.path.abspath(__file__))),
    # System paths
    "/usr/local/lib",
    "/usr/lib",
]

lib_path = None
for path in lib_paths:
    full_path = os.path.join(path, lib_name)
    if os.path.exists(full_path):
        lib_path = full_path
        break

if lib_path is None:
    raise ImportError(f"Could not find {lib_name}. Make sure it's installed correctly.")

lib = ffi.dlopen(lib_path)
"#;
        std::fs::write(native_module_path, native_content)?;
        
        // Security module
        let security_module_path = self.output_dir
            .join(&self.package_name)
            .join("security")
            .join("security.py");
            
        let security_content = r#"
from dataclasses import dataclass, field
from typing import List, Optional, Dict, Set

@dataclass
class MemoryLimits:
    """Memory limits for sandbox instances"""
    max_memory_pages: int = 1024  # 64MB (1 page = 64KB)
    reserved_memory_pages: int = 1  # 64KB
    max_growth_rate: Optional[int] = None  # pages per second, None for unlimited

@dataclass
class CpuLimits:
    """CPU limits for sandbox instances"""
    max_execution_time: int = 30000  # milliseconds
    target_cpu_usage: Optional[float] = None  # percentage (0.0-1.0), None for unlimited
    throttle_threshold: Optional[float] = None  # percentage (0.0-1.0), None for no throttling

@dataclass
class IoLimits:
    """I/O limits for sandbox instances"""
    max_read_bytes: Optional[int] = None  # bytes, None for unlimited
    max_write_bytes: Optional[int] = None  # bytes, None for unlimited
    max_read_files: Optional[int] = None  # count, None for unlimited
    max_write_files: Optional[int] = None  # count, None for unlimited
    max_read_rate: Optional[int] = None  # bytes per second, None for unlimited
    max_write_rate: Optional[int] = None  # bytes per second, None for unlimited

@dataclass
class TimeLimits:
    """Time limits for sandbox instances"""
    max_clock_drift: Optional[int] = None  # milliseconds, None for unlimited
    max_execution_time: int = 30000  # milliseconds
    idle_timeout: Optional[int] = None  # milliseconds, None for no idle timeout

@dataclass
class FilesystemCapability:
    """Filesystem capabilities for sandbox instances"""
    readable_dirs: List[str] = field(default_factory=list)
    writable_dirs: List[str] = field(default_factory=list)
    max_file_size: Optional[int] = None  # bytes, None for unlimited
    allow_create: bool = False
    allow_delete: bool = False

@dataclass
class NetworkCapability:
    """Network capability configuration"""
    allow_outbound: bool = False
    allow_inbound: bool = False
    allowed_hosts: List[str] = field(default_factory=list)
    allowed_ports: List[int] = field(default_factory=list)
    allowed_protocols: List[str] = field(default_factory=list)

@dataclass
class Capabilities:
    """Security capabilities for sandbox instances"""
    filesystem: FilesystemCapability = field(default_factory=FilesystemCapability)
    network: NetworkCapability = field(default_factory=NetworkCapability)
    environment_variables: Set[str] = field(default_factory=set)
    allow_process_creation: bool = False
    allow_dynamic_code: bool = False
    allow_stdout: bool = True
    allow_stderr: bool = True
    
    @classmethod
    def minimal(cls):
        """Create minimal capabilities - most restrictive"""
        return cls(
            filesystem=FilesystemCapability(),
            network=NetworkCapability(),
            environment_variables=set(),
            allow_process_creation=False,
            allow_dynamic_code=False,
            allow_stdout=False,
            allow_stderr=False,
        )

@dataclass
class ResourceLimits:
    """Resource limits for sandbox instances"""
    memory: MemoryLimits = field(default_factory=MemoryLimits)
    cpu: CpuLimits = field(default_factory=CpuLimits)
    io: IoLimits = field(default_factory=IoLimits)
    time: TimeLimits = field(default_factory=TimeLimits)
"#;
        std::fs::write(security_module_path, security_content)?;
        
        Ok(())
    }
    
    /// Generate setup.py
    fn generate_setup_py(&self) -> Result<()> {
        let setup_py = format!(r#"#!/usr/bin/env python3

from setuptools import setup, find_packages

setup(
    name="{package_name}",
    version="{version}",
    description="Python bindings for wasm-sandbox - A secure WebAssembly sandbox",
    long_description=open("README.md").read(),
    long_description_content_type="text/markdown",
    author="Eric Evans",
    author_email="ciresnave@gmail.com",
    url="https://github.com/ciresnave/wasm-sandbox",
    packages=find_packages(),
    python_requires=">={min_python_version}",
    install_requires=[
{dependencies}
    ],
    classifiers=[
        "Development Status :: 4 - Beta",
        "Intended Audience :: Developers",
        "License :: OSI Approved :: MIT License",
        "Programming Language :: Python :: 3",
        "Programming Language :: Python :: 3.8",
        "Programming Language :: Python :: 3.9",
        "Programming Language :: Python :: 3.10",
        "Programming Language :: Python :: 3.11",
        "Topic :: Software Development :: Libraries :: Python Modules",
        "Topic :: System :: Software Distribution",
    ],
)
"#,
            package_name = self.package_name,
            version = self.version,
            min_python_version = self.min_python_version,
            dependencies = self.dependencies.iter()
                .map(|dep| format!("        \"{}\",", dep))
                .collect::<Vec<_>>()
                .join("\n"),
        );
        
        std::fs::write(self.output_dir.join("setup.py"), setup_py)?;
        
        Ok(())
    }
    
    /// Generate README.md
    fn generate_readme(&self) -> Result<()> {
        let readme = format!(r#"# {package_name}

Python bindings for [wasm-sandbox](https://github.com/ciresnave/wasm-sandbox) - A secure WebAssembly sandbox for running untrusted code.

## Installation

```bash
pip install {package_name}
```

## Quick Start

```python
from {package_name} import run, run_with_timeout
import time

# Simple one-line execution
result = run("calculator.py", "add", [5, 3])
print(f"5 + 3 = {{result}}")  # Output: 5 + 3 = 8

# With timeout
result = run_with_timeout("processor.py", "process", "data", timeout_seconds=30)
print(f"Processed: {{result}}")

# Using the builder pattern
from {package_name} import WasmSandbox

sandbox = WasmSandbox.builder() \
    .source("my_program.py") \
    .timeout_duration(60) \
    .memory_limit(64 * 1024 * 1024) \
    .enable_file_access(False) \
    .build()

# Call multiple functions
add_result = sandbox.call("add", [10, 20])
print(f"10 + 20 = {{add_result}}")  # Output: 10 + 20 = 30
```

## Features

- **🔒 Secure Execution**: Run untrusted code safely in an isolated sandbox
- **🚀 Simple API**: One-line execution for common use cases
- **⏱️ Resource Limits**: Control memory usage, execution time, and more
- **🔧 Flexible Configuration**: Full control over security capabilities

## Requirements

- Python {min_python_version}+
- CFFI 1.15.0+
- wasm-sandbox native library
"#,
            package_name = self.package_name,
            min_python_version = self.min_python_version,
        );
        
        std::fs::write(self.output_dir.join("README.md"), readme)?;
        
        Ok(())
    }
    
    /// Generate pyproject.toml
    fn generate_pyproject_toml(&self) -> Result<()> {
        let pyproject_toml = format!(r#"[build-system]
requires = ["setuptools>=42", "wheel"]
build-backend = "setuptools.build_meta"

[tool.black]
line-length = 100
target-version = ["py38"]

[tool.isort]
profile = "black"
multi_line_output = 3

[tool.mypy]
python_version = "{min_python_version}"
warn_return_any = true
warn_unused_configs = true
disallow_untyped_defs = true
disallow_incomplete_defs = true

[tool.pytest.ini_options]
testpaths = ["tests"]
python_files = "test_*.py"
"#,
            min_python_version = self.min_python_version,
        );
        
        std::fs::write(self.output_dir.join("pyproject.toml"), pyproject_toml)?;
        
        Ok(())
    }
    
    /// Generate __init__.py content
    fn generate_init_py_content(&self) -> String {
        format!(r#"""Python bindings for wasm-sandbox

A secure WebAssembly sandbox for running untrusted code.
"""

__version__ = "{version}"

from .sandbox.sandbox import WasmSandbox, run, run_with_timeout
from .security.security import (
    Capabilities, ResourceLimits, MemoryLimits, CpuLimits,
    FilesystemCapability, NetworkCapability
)

__all__ = [
    "WasmSandbox",
    "run",
    "run_with_timeout",
    "Capabilities",
    "ResourceLimits",
    "MemoryLimits",
    "CpuLimits",
    "FilesystemCapability",
    "NetworkCapability",
]
"#,
            version = self.version,
        )
    }
}

/// Generate C bindings for Python
pub struct CBindingsGenerator {
    /// Output directory for C bindings
    output_dir: PathBuf,
}

impl CBindingsGenerator {
    /// Create a new C bindings generator
    pub fn new(output_dir: impl AsRef<Path>) -> Self {
        Self {
            output_dir: output_dir.as_ref().to_path_buf(),
        }
    }
    
    /// Generate C bindings
    pub fn generate(&self) -> Result<()> {
        // Create output directory
        std::fs::create_dir_all(&self.output_dir)?;
        
        // Generate header file
        self.generate_header()?;
        
        // Generate implementation file
        self.generate_implementation()?;
        
        // Generate build script
        self.generate_build_script()?;
        
        Ok(())
    }
    
    /// Generate header file
    fn generate_header(&self) -> Result<()> {
        let header_content = r#"/**
 * wasm_sandbox_python.h
 * C bindings for wasm-sandbox Python integration
 */

#ifndef WASM_SANDBOX_PYTHON_H
#define WASM_SANDBOX_PYTHON_H

#include <stdint.h>
#include <stddef.h>

#ifdef __cplusplus
extern "C" {
#endif

/**
 * Create a new sandbox
 * @return Handle to the sandbox or NULL on error
 */
void* sandbox_new(void);

/**
 * Free a sandbox
 * @param sandbox Handle to the sandbox
 */
void sandbox_free(void* sandbox);

/**
 * Load a WebAssembly module from source code
 * @param sandbox Handle to the sandbox
 * @param source_path Path to the source code
 * @return 0 on success, non-zero on error
 */
int sandbox_load_from_source(void* sandbox, const char* source_path);

/**
 * Load a WebAssembly module from bytes
 * @param sandbox Handle to the sandbox
 * @param wasm_bytes WebAssembly module bytes
 * @param wasm_len Length of WebAssembly module bytes
 * @return Module ID string or NULL on error
 */
const char* sandbox_load_module(void* sandbox, const void* wasm_bytes, size_t wasm_len);

/**
 * Call a function in the sandbox
 * @param sandbox Handle to the sandbox
 * @param function_name Name of the function to call
 * @param params_json JSON-encoded parameters
 * @return Result handle or NULL on error
 */
void* sandbox_call_function(void* sandbox, const char* function_name, const char* params_json);

/**
 * Create a new sandbox builder
 * @return Handle to the builder or NULL on error
 */
void* sandbox_builder_new(void);

/**
 * Free a sandbox builder
 * @param builder Handle to the builder
 */
void sandbox_builder_free(void* builder);

/**
 * Set the source code path
 * @param builder Handle to the builder
 * @param source_path Path to the source code
 */
void sandbox_builder_source(void* builder, const char* source_path);

/**
 * Set the execution timeout duration
 * @param builder Handle to the builder
 * @param timeout_ms Timeout in milliseconds
 */
void sandbox_builder_timeout(void* builder, unsigned int timeout_ms);

/**
 * Set the memory limit
 * @param builder Handle to the builder
 * @param limit_bytes Memory limit in bytes
 */
void sandbox_builder_memory_limit(void* builder, size_t limit_bytes);

/**
 * Enable or disable file system access
 * @param builder Handle to the builder
 * @param enabled 1 to enable, 0 to disable
 */
void sandbox_builder_file_access(void* builder, int enabled);

/**
 * Enable or disable network access
 * @param builder Handle to the builder
 * @param enabled 1 to enable, 0 to disable
 */
void sandbox_builder_network(void* builder, int enabled);

/**
 * Build the sandbox with the configured settings
 * @param builder Handle to the builder
 * @return Handle to the sandbox or NULL on error
 */
void* sandbox_builder_build(void* builder);

/**
 * Get the JSON-encoded result
 * @param result Handle to the result
 * @return JSON-encoded result or NULL on error
 */
const char* get_result_json(void* result);

/**
 * Free a result
 * @param result Handle to the result
 */
void free_result(void* result);

/**
 * Get the last error message
 * @return Error message or NULL if no error
 */
const char* get_last_error(void);

#ifdef __cplusplus
}
#endif

#endif /* WASM_SANDBOX_PYTHON_H */
"#;
        
        std::fs::write(self.output_dir.join("wasm_sandbox_python.h"), header_content)?;
        
        Ok(())
    }
    
    /// Generate implementation file
    fn generate_implementation(&self) -> Result<()> {
        let implementation = r#"/**
 * wasm_sandbox_python.c
 * C bindings for wasm-sandbox Python integration
 */

#include "wasm_sandbox_python.h"
#include <stdlib.h>
#include <string.h>
#include <stdio.h>

#define WASM_SANDBOX_EXPORT __declspec(dllexport)

// Thread-local error message buffer
static __thread char error_buffer[1024];

// Set the last error message
static void set_error(const char* message) {
    if (message) {
        strncpy(error_buffer, message, sizeof(error_buffer) - 1);
        error_buffer[sizeof(error_buffer) - 1] = '\0';
    } else {
        error_buffer[0] = '\0';
    }
}

// These are just stub implementations that would be replaced with actual
// bindings to the Rust library using technologies like cxx, cbindgen, or bindgen

WASM_SANDBOX_EXPORT void* sandbox_new(void) {
    // Placeholder for actual implementation
    void* handle = malloc(8);  // Just a placeholder
    if (!handle) {
        set_error("Failed to allocate memory for sandbox");
        return NULL;
    }
    return handle;
}

WASM_SANDBOX_EXPORT void sandbox_free(void* sandbox) {
    if (sandbox) {
        free(sandbox);
    }
}

WASM_SANDBOX_EXPORT int sandbox_load_from_source(void* sandbox, const char* source_path) {
    if (!sandbox || !source_path) {
        set_error("Invalid arguments");
        return -1;
    }
    // Placeholder
    return 0;
}

WASM_SANDBOX_EXPORT const char* sandbox_load_module(void* sandbox, const void* wasm_bytes, size_t wasm_len) {
    if (!sandbox || !wasm_bytes || wasm_len == 0) {
        set_error("Invalid arguments");
        return NULL;
    }
    
    // Placeholder: Just return a fixed string
    static char module_id[] = "module-12345";
    return module_id;
}

WASM_SANDBOX_EXPORT void* sandbox_call_function(void* sandbox, const char* function_name, const char* params_json) {
    if (!sandbox || !function_name || !params_json) {
        set_error("Invalid arguments");
        return NULL;
    }
    
    // Placeholder: Allocate a result to return
    void* result = malloc(16);
    if (!result) {
        set_error("Failed to allocate result");
        return NULL;
    }
    
    // In a real implementation, this would call into the Rust library
    return result;
}

WASM_SANDBOX_EXPORT void* sandbox_builder_new(void) {
    void* handle = malloc(8);  // Just a placeholder
    if (!handle) {
        set_error("Failed to allocate memory for builder");
        return NULL;
    }
    return handle;
}

WASM_SANDBOX_EXPORT void sandbox_builder_free(void* builder) {
    if (builder) {
        free(builder);
    }
}

WASM_SANDBOX_EXPORT void sandbox_builder_source(void* builder, const char* source_path) {
    // Placeholder
}

WASM_SANDBOX_EXPORT void sandbox_builder_timeout(void* builder, unsigned int timeout_ms) {
    // Placeholder
}

WASM_SANDBOX_EXPORT void sandbox_builder_memory_limit(void* builder, size_t limit_bytes) {
    // Placeholder
}

WASM_SANDBOX_EXPORT void sandbox_builder_file_access(void* builder, int enabled) {
    // Placeholder
}

WASM_SANDBOX_EXPORT void sandbox_builder_network(void* builder, int enabled) {
    // Placeholder
}

WASM_SANDBOX_EXPORT void* sandbox_builder_build(void* builder) {
    if (!builder) {
        set_error("Invalid builder");
        return NULL;
    }
    
    void* sandbox = malloc(8);  // Just a placeholder
    if (!sandbox) {
        set_error("Failed to create sandbox");
        return NULL;
    }
    
    return sandbox;
}

WASM_SANDBOX_EXPORT const char* get_result_json(void* result) {
    if (!result) {
        set_error("Invalid result");
        return NULL;
    }
    
    // Placeholder: Return a fixed JSON result
    static char json_result[] = "{\"result\": 42}";
    return json_result;
}

WASM_SANDBOX_EXPORT void free_result(void* result) {
    if (result) {
        free(result);
    }
}

WASM_SANDBOX_EXPORT const char* get_last_error(void) {
    if (error_buffer[0] == '\0') {
        return NULL;
    }
    return error_buffer;
}
"#;
        
        std::fs::write(self.output_dir.join("wasm_sandbox_python.c"), implementation)?;
        
        Ok(())
    }
    
    /// Generate build script
    fn generate_build_script(&self) -> Result<()> {
        let build_script = r#"#!/bin/bash

set -e

# Build settings
CC=${CC:-gcc}
CFLAGS="-Wall -Wextra -O2 -fPIC -I."
OUTPUT_NAME="libwasm_sandbox_python.so"

if [[ "$OSTYPE" == "darwin"* ]]; then
    CFLAGS="$CFLAGS -dynamiclib"
    OUTPUT_NAME="libwasm_sandbox_python.dylib"
elif [[ "$OSTYPE" == "msys" || "$OSTYPE" == "cygwin" || "$OSTYPE" == "win32" ]]; then
    CC=${CC:-cl}
    CFLAGS="/W4 /O2 /LD"
    OUTPUT_NAME="wasm_sandbox_python.dll"
fi

echo "Building $OUTPUT_NAME..."

if [[ "$OSTYPE" == "msys" || "$OSTYPE" == "cygwin" || "$OSTYPE" == "win32" ]]; then
    # Windows with MSVC
    $CC $CFLAGS wasm_sandbox_python.c /Fe$OUTPUT_NAME
else
    # Unix-like systems
    $CC $CFLAGS -o $OUTPUT_NAME wasm_sandbox_python.c -lm
fi

echo "Build complete: $OUTPUT_NAME"
"#;
        
        std::fs::write(self.output_dir.join("build.sh"), build_script)?;
        
        // Make the build script executable on Unix-like systems
        #[cfg(unix)]
        {
            use std::os::unix::fs::PermissionsExt;
            let mut perm = std::fs::metadata(self.output_dir.join("build.sh"))?.permissions();
            perm.set_mode(0o755);
            std::fs::set_permissions(self.output_dir.join("build.sh"), perm)?;
        }
        
        Ok(())
    }
}

/// Language bindings manager
pub struct LanguageBindings;

impl LanguageBindings {
    /// Generate Python bindings
    pub fn generate_python_bindings(output_dir: impl AsRef<Path>) -> Result<()> {
        let python_dir = output_dir.as_ref().join("python");
        
        // Generate Python package
        let python_bindings = PythonBindings::new(&python_dir);
        python_bindings.generate()?;
        
        // Generate C bindings
        let c_bindings_dir = output_dir.as_ref().join("python_c_bindings");
        let c_bindings = CBindingsGenerator::new(c_bindings_dir);
        c_bindings.generate()?;
        
        Ok(())
    }
    
    // This would be expanded with other language bindings
    // pub fn generate_javascript_bindings(output_dir: impl AsRef<Path>) -> Result<()> { ... }
    // pub fn generate_ruby_bindings(output_dir: impl AsRef<Path>) -> Result<()> { ... }
    // etc.
}