# SPDX-License-Identifier: GPL-3.0-or-later
#
# GNS3-Copilot - AI-powered Network Lab Assistant for GNS3
#
# This file is part of GNS3-Copilot project.
#
# GNS3-Copilot is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation, either version 3 of the License, or (at your
# option) any later version.
#
# GNS3-Copilot is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
# for more details.
#
# You should have received a copy of the GNU General Public License
# along with GNS3-Copilot. If not, see <https://www.gnu.org/licenses/>.
#
# Copyright (C) 2025 Yue Guobin (岳国宾)
# Author: Yue Guobin (岳国宾)
#
# Project Home: https://github.com/yueguobin/gns3-copilot
#

"""

GNS3 node suspend tool for pausing network devices.

Provides functionality to suspend one or multiple nodes in GNS3 projects.
Suspended nodes preserve their state in memory and can be quickly resumed.
"""

import json
import logging
from pprint import pprint
from typing import Any

from langchain.tools import BaseTool
from langchain_core.callbacks import CallbackManagerForToolRun

from gns3server.agent.gns3_copilot.gns3_client import Node
from gns3server.agent.gns3_copilot.gns3_client import get_gns3_connector

# Configure logging
logger = logging.getLogger(__name__)


class GNS3SuspendNodeTool(BaseTool):
    """
    A LangChain tool to suspend one or multiple nodes in a GNS3 project.

    **Input**:
    A JSON object with project_id and node_ids (list of node IDs).
    Example:
        {
            "project_id": "uuid-of-project",
            "node_ids": ["uuid-of-node-1", "uuid-of-node-2"]
        }

    **Output**:
    A dictionary with all nodes' details:
    {
        "project_id": "...",
        "total_nodes": 2,
        "successful": 2,
        "failed": 0,
        "nodes": [
            {"node_id": "...", "name": "...", "status": "suspended"},
            {"node_id": "...", "name": "...", "status": "suspended"}
        ]
    }

    **Note**: Suspended nodes preserve their state in memory and can be quickly
    resumed. Use this when you want to pause a lab and continue later.
    """

    name: str = "suspend_gns3_node"
    description: str = """
    Suspends one or multiple nodes in a GNS3 project.
    Suspended nodes preserve their state and can be quickly resumed.
    Use this to pause a lab temporarily and continue later.
    Input: JSON with project_id and node_ids (list of node IDs).
    Returns: A dict with all nodes' details (success/failure status).
    """

    def _run(
        self,
        tool_input: str,
        run_manager: CallbackManagerForToolRun | None = None,
    ) -> dict[str, Any]:
        try:
            # Parse input JSON
            input_data = json.loads(tool_input)
            project_id = input_data.get("project_id")
            node_ids = input_data.get("node_ids")

            # Validate input
            if not project_id or not node_ids:
                logger.error(
                    "Missing required fields: project_id or node_ids."
                )
                return {
                    "error": "Missing required fields: "
                    "project_id and node_ids."
                }

            if not isinstance(node_ids, list):
                logger.error("node_ids must be a list.")
                return {"error": "node_ids must be a list."}

            # Initialize Gns3Connector using factory function
            logger.info("Connecting to GNS3 server...")
            gns3_server = get_gns3_connector()

            if gns3_server is None:
                logger.error("Failed to create GNS3 connector")
                return {
                    "error": "Failed to connect to GNS3 server. "
                    "Please check your configuration."
                }

            # Suspend all nodes and collect results
            logger.info(
                "Suspending %d nodes in project %s...",
                len(node_ids),
                project_id,
            )
            results = []

            for node_id in node_ids:
                try:
                    node = Node(
                        project_id=project_id,
                        node_id=node_id,
                        connector=gns3_server,
                    )
                    # Verify node exists and get current info
                    node.get()
                    if not node.node_id:
                        logger.error(
                            "Node %s not found in project %s",
                            node_id,
                            project_id,
                        )
                        results.append(
                            {
                                "node_id": node_id,
                                "name": "N/A",
                                "status": "error",
                                "error": "Node not found",
                            }
                        )
                        continue

                    # Send suspend command
                    node.suspend()
                    logger.info(
                        "Suspend command sent for node %s (%s)",
                        node_id,
                        node.name,
                    )

                    # Get updated status
                    node.get()
                    node_info = {
                        "node_id": node.node_id,
                        "name": node.name or "N/A",
                        "status": node.status or "unknown",
                    }
                    results.append(node_info)

                except Exception as e:
                    logger.error("Failed to suspend node %s: %s", node_id, e)
                    results.append(
                        {
                            "node_id": node_id,
                            "name": "N/A",
                            "status": "error",
                            "error": str(e),
                        }
                    )

            # Analyze results
            successful_nodes = [
                r for r in results if r.get("status") != "error"
            ]
            failed_nodes = [r for r in results if r.get("status") == "error"]

            # Construct final response
            response = {
                "project_id": project_id,
                "total_nodes": len(node_ids),
                "successful": len(successful_nodes),
                "failed": len(failed_nodes),
                "nodes": results,
                "note": (
                    "Suspended nodes preserve their state in memory. "
                    "Use resume to continue where you left off."
                ),
            }

            logger.info(
                "Suspend operation completed: %d successful, %d failed",
                len(successful_nodes),
                len(failed_nodes),
            )

            return response

        except json.JSONDecodeError as e:
            logger.error("Invalid JSON input: %s", e)
            return {"error": f"Invalid JSON input: {e}"}
        except Exception as e:
            logger.error("Failed to suspend nodes: %s", e)
            return {"error": f"Failed to suspend nodes: {str(e)}"}


if __name__ == "__main__":
    # Test with single node
    print("=== Testing single node suspend ===")
    test_input_single = json.dumps(
        {
            "project_id": "<PROJECT_UUID>",  # Replace with actual project UUID
            "node_ids": [
                "fbeda109-9a74-4d8c-a749-cc3847911a90"
            ],  # Replace with actual node UUID
        }
    )
    tool = GNS3SuspendNodeTool()
    result_single = tool._run(test_input_single)
    pprint(result_single)

    # Test with multiple nodes
    print("\n=== Testing multiple nodes suspend ===")
    test_input_multiple = json.dumps(
        {
            "project_id": "<PROJECT_UUID>",  # Replace with actual project UUID
            "node_ids": [
                "fbeda109-9a74-4d8c-a749-cc3847911a90",
                # Replace with actual node UUIDs
                "another-node-uuid-here",
                "third-node-uuid-here",
            ],
        }
    )
    result_multiple = tool._run(test_input_multiple)
    pprint(result_multiple)
