# 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 Topology Reader Tool

This module provides a LangChain BaseTool to retrieve the topology of a
specific GNS3 project by project ID. Returns nodes, links, and project
metadata.

"""

import copy
import logging
from pprint import pprint
from typing import Any

from langchain.tools import BaseTool

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

# Configure logging
logger = logging.getLogger(__name__)


# Define LangChain tool class
class GNS3TopologyTool(BaseTool):
    """LangChain tool for retrieving GNS3 project topology information."""

    name: str = "gns3_topology_reader"
    description: str = """
    Retrieves the topology of a GNS3 project including nodes and links.

    Input: `project_id` (str, required): UUID of the GNS3 project.

    Output: Dictionary with:
    - `project_id`, `name`, `status`: Project metadata
    - `nodes`: Dict of node details (node_id, name, ports, console_port,
               type, etc.)
    - `links`: List of link connections

    Use this to understand network structure before making changes.
    """

    def _run(
        self,
        tool_input: Any = None,
        run_manager: Any = None,
        project_id: str | None = None,
    ) -> dict:
        """
        Synchronous method to retrieve the topology of a specific GNS3 project.

        Args:
            tool_input: Input parameters, typically a dict or Pydantic model
                       containing server_url.
            run_manager: Callback manager for tool run.
            project_id: The UUID of the specific GNS3 project to retrieve
                        topology from.

        Returns:
            dict: A dictionary containing the project ID, name, status, nodes,
                  and links, or an error dictionary if an exception occurs
                  or project_id is not provided.
        """

        # Log received input
        logger.info(
            "Received tool_input: %s, project_id: %s", tool_input, project_id
        )

        try:
            # Validate project_id parameter
            if not project_id:
                logger.error("project_id parameter is required.")
                return {
                    "error": "project_id parameter is required. "
                    "Please provide a valid project UUID."
                }

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

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

            # Use the provided project_id directly
            logger.info(f"Retrieving topology for project_id: {project_id}")
            project = Project(project_id=project_id, connector=server)
            project.get()  # Load project details

            # Get topology JSON: includes nodes (devices), links, etc.
            topology = {
                "project_id": project.project_id,
                "name": project.name,
                "status": project.status,
                "nodes": self._clean_nodes_ports(
                    copy.deepcopy(project.nodes_inventory())
                ),
                "links": project.links_summary(is_print=False),
            }

            # Log topology result
            logger.info(
                "Topology retrieved: project_id=%s, name=%s, nodes=%d, "
                "links=%d",
                topology.get("project_id"),
                topology.get("name"),
                len(topology.get("nodes", {})),
                len(topology.get("links", [])),
            )
            logger.debug("Topology details: %s", topology)

            return topology

        except Exception as e:
            logger.error("Error retrieving GNS3 topology: %s", str(e))
            return {"error": f"Failed to retrieve topology: {str(e)}"}

    def _clean_nodes_ports(self, data: dict) -> dict:
        """
        Clean and simplify the nodes data structure.

        Simplify each node's ports list to only keep name and short_name
        fields.
        """
        for node in data.values():  # Iterate through R-1, R-2, R-3, R-4
            if "ports" in node and isinstance(node["ports"], list):
                node["ports"] = [
                    {"name": port["name"], "short_name": port["short_name"]}
                    for port in node["ports"]
                ]
        return data


if __name__ == "__main__":
    # Test the tool
    tool = GNS3TopologyTool()

    # Example usage with project_id
    # Replace with an actual project UUID from your GNS3 server
    example_project_id = "0c0fde25-6ead-4413-a283-ea8fd2324291"

    print("Testing GNS3TopologyTool with project_id...")
    result = tool._run(project_id=example_project_id)
    pprint(result)

    # Test without project_id (should return error)
    print("\nTesting without project_id (should return error)...")
    error_result = tool._run()
    pprint(error_result)