"""
Subprocess-Isolated Sandbox Interface for Python-to-Dana Integration

PLACEHOLDER IMPLEMENTATION - Future Ready Architecture

This module provides the interface and placeholder implementation for subprocess isolation.
Currently delegates to the existing in-process implementation while maintaining the
same API that will be used for true subprocess isolation in the future.
"""

from typing import Any

from dana.core.lang.sandbox_context import SandboxContext
from dana.integrations.python.to_dana.core.inprocess_sandbox import InProcessSandboxInterface


class SubprocessSandboxInterface:
    """Subprocess-isolated implementation placeholder for SandboxInterface.

    TODO: Future Implementation Plan
    - Implement subprocess communication via JSON-RPC over stdin/stdout
    - Add subprocess lifecycle management (start, restart, shutdown)
    - Implement timeout handling and error recovery
    - Add subprocess health monitoring
    - Support configuration serialization to subprocess

    CURRENT: Delegates to InProcessSandboxInterface while maintaining future API
    """

    def __init__(self, debug: bool = False, context: SandboxContext | None = None, timeout: float = 30.0, restart_on_failure: bool = True):
        """Initialize the subprocess-isolated sandbox.

        Args:
            debug: Enable debug mode
            context: Sandbox context (will be serialized to subprocess in future)
            timeout: Timeout for IPC calls in seconds (future use)
            restart_on_failure: Automatically restart subprocess on failure (future use)
        """
        # Store configuration for future subprocess isolation
        self._debug = debug
        self._context = context
        self._timeout = timeout
        self._restart_on_failure = restart_on_failure

        # TODO: Replace with actual subprocess management
        # For now, delegate to in-process implementation
        self._delegate = InProcessSandboxInterface(debug=debug, context=context)

        if debug:
            print("DEBUG: SubprocessSandboxInterface using in-process delegate (subprocess isolation not yet implemented)")

    def reason(self, prompt: str, options: dict | None = None) -> Any:
        """Execute Dana reasoning function.

        TODO: Future Implementation
        - Serialize request to JSON-RPC format
        - Send via IPC to Dana subprocess
        - Handle timeout and retries
        - Deserialize response from subprocess

        CURRENT: Delegates to in-process implementation

        Args:
            prompt: The question or prompt to send to the LLM
            options: Optional parameters for LLM configuration

        Returns:
            The LLM's response to the prompt
        """
        # TODO: Replace with IPC communication
        # Example future implementation:
        # request = {"method": "reason", "params": {"prompt": prompt, "options": options}}
        # response = self._send_ipc_request(request)
        # return response["result"]

        return self._delegate.reason(prompt, options)

    def execute_function(self, func_name: str, args: tuple = (), kwargs: dict | None = None) -> Any:
        """Execute a Dana function with given arguments.

        TODO: Future Implementation
        - Serialize function call to JSON-RPC format
        - Send via IPC to Dana subprocess
        - Handle timeout and retries
        - Deserialize response from subprocess

        CURRENT: Delegates to in-process implementation

        Args:
            func_name: Name of the Dana function to execute
            args: Positional arguments to pass to the function
            kwargs: Keyword arguments to pass to the function

        Returns:
            The result of the Dana function execution (may be an EagerPromise object)
        """
        # TODO: Replace with IPC communication
        # Example future implementation:
        # request = {"method": "execute_function", "params": {"func_name": func_name, "args": args, "kwargs": kwargs}}
        # response = self._send_ipc_request(request)
        # return response["result"]

        # The result may be an EagerPromise object - this is expected behavior
        # Promise transparency will handle resolution when the result is accessed
        return self._delegate.execute_function(func_name, args, kwargs)

    def exec_module(self, file_path: str) -> Any:
        """Execute a Dana module from a file path.

        TODO: Future Implementation
        - Serialize module execution request to JSON-RPC format
        - Send file path via IPC to Dana subprocess
        - Handle timeout and retries
        - Deserialize response from subprocess

        CURRENT: Delegates to in-process implementation

        Args:
            file_path: Path to the Dana (.na) file to execute

        Returns:
            The execution result containing context and any return values
        """
        # TODO: Replace with IPC communication
        # Example future implementation:
        # request = {"method": "exec_module", "params": {"file_path": file_path}}
        # response = self._send_ipc_request(request)
        # return response["result"]

        return self._delegate.exec_module(file_path)

    @property
    def is_subprocess_isolated(self) -> bool:
        """Check if running in subprocess-isolated mode."""
        # TODO: Return True when actual subprocess isolation is implemented
        return False

    @property
    def subprocess_pid(self) -> int | None:
        """Get the Dana subprocess PID."""
        # TODO: Return actual subprocess PID when implemented
        return None

    def restart_subprocess(self):
        """Restart the Dana subprocess (placeholder)."""
        # TODO: Implement subprocess restart logic
        if self._debug:
            print("DEBUG: Subprocess restart requested (not implemented, restarting delegate)")

        # For now, recreate the delegate
        self._delegate = InProcessSandboxInterface(debug=self._debug, context=self._context)

    def close(self):
        """Close the subprocess sandbox."""
        # TODO: Implement graceful subprocess shutdown
        if self._debug:
            print("DEBUG: SubprocessSandboxInterface closing")

        # Cleanup delegate
        if hasattr(self._delegate, "close"):
            self._delegate.close()


# TODO: Future subprocess worker implementation
# This will be a separate script that runs as a subprocess
class DanaSubprocessWorker:
    """Placeholder for Dana subprocess worker.

    TODO: Future Implementation
    - JSON-RPC message handling over stdin/stdout
    - Dana sandbox initialization in subprocess
    - Request processing and response serialization
    - Error handling and graceful shutdown
    """

    def __init__(self, debug: bool = False):
        """Initialize worker (placeholder).

        Args:
            debug: Enable debug mode for the subprocess worker
        """
        self.debug = debug
        # TODO: Initialize DanaSandbox in subprocess
        pass

    def run(self):
        """Main worker loop (placeholder).

        TODO: Implement main message processing loop
        - Read JSON-RPC requests from stdin
        - Process requests using DanaSandbox
        - Send JSON-RPC responses to stdout
        """
        pass


# Configuration for future subprocess isolation
SUBPROCESS_ISOLATION_CONFIG = {
    "enabled": False,  # TODO: Set to True when implemented
    "default_timeout": 30.0,
    "restart_on_failure": True,
    "max_restart_attempts": 3,
    "subprocess_startup_timeout": 10.0,
    "communication_protocol": "json-rpc",  # Future: support different protocols
    "max_memory_mb": 512,  # Future: memory limits for subprocess
}
