"""
PyserSSH - A Scriptable SSH server. For more info visit https://github.com/DPSoftware-Foundation/PyserSSH
Copyright (C) 2023-present DPSoftware Foundation (MIT)

Visit https://github.com/DPSoftware-Foundation/PyserSSH

MIT License

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
"""

import time
import logging

logger = logging.getLogger("PyserSSH.Utils.ServerManager")

class ServerManager:
    def __init__(self):
        self.servers = {}

    def add_server(self, name, server, *args, **kwargs):
        """
        Adds a server to the manager with the specified name. Raises an error if a server with the same name already exists.

        Args:
            name (str): The name of the server.
            server (object): The server instance to be added.
            *args: Arguments for server initialization.
            **kwargs: Keyword arguments for server initialization.

        Raises:
            ValueError: If a server with the same name already exists.
        """
        if name in self.servers:
            raise ValueError(f"Server with name '{name}' already exists.")
        self.servers[name] = {"server": server, "args": args, "kwargs": kwargs, "status": "stopped"}
        logger.info(f"Server '{name}' added.")

    def remove_server(self, name):
        """
        Removes a server from the manager by name. Raises an error if the server does not exist.

        Args:
            name (str): The name of the server to be removed.

        Raises:
            ValueError: If no server with the specified name exists.
        """
        if name not in self.servers:
            raise ValueError(f"No server found with name '{name}'.")
        del self.servers[name]
        logger.info(f"Server '{name}' removed.")

    def get_server(self, name):
        """
        Retrieves a server by its name.

        Args:
            name (str): The name of the server to retrieve.

        Returns:
            dict: A dictionary containing the server instance, arguments, keyword arguments, and its status, or None if the server is not found.
        """
        return self.servers.get(name, None)

    def start_server(self, name):
        """
        Starts a server with the specified name if it is not already running. Blocks until the server starts.

        Args:
            name (str): The name of the server to start.

        Raises:
            ValueError: If no server with the specified name exists or the server cannot be started.
        """
        server_info = self.get_server(name)
        if not server_info:
            raise ValueError(f"No server found with name '{name}'.")

        if server_info["status"] == "running":
            logger.info(f"Server '{name}' is already running.")
            return

        server = server_info["server"]
        args, kwargs = server_info["args"], server_info["kwargs"]

        logger.info(f"Starting server '{name}' with arguments {args}...")
        server_info["status"] = "starting"
        server.run(*args, **kwargs)

        while not server.isrunning:
            logger.debug(f"Waiting for server '{name}' to start...")
            time.sleep(0.1)

        server_info["status"] = "running"
        logger.info(f"Server '{name}' is now running.")

    def stop_server(self, name):
        """
        Stops a server with the specified name if it is running. Blocks until the server stops.

        Args:
            name (str): The name of the server to stop.

        Raises:
            ValueError: If no server with the specified name exists or the server cannot be stopped.
        """
        server_info = self.get_server(name)
        if not server_info:
            raise ValueError(f"No server found with name '{name}'.")

        if server_info["status"] == "stopped":
            logger.info(f"Server '{name}' is already stopped.")
            return

        server = server_info["server"]

        logger.info(f"Shutting down server '{name}'...")
        server_info["status"] = "shutting down"
        server.stop_server()

        while server.isrunning:
            logger.debug(f"Waiting for server '{name}' to shut down...")
            time.sleep(0.1)

        server_info["status"] = "stopped"
        logger.info(f"Server '{name}' has been stopped.")

    def start_all_servers(self):
        """
        Starts all servers managed by the ServerManager. Blocks until each server starts.
        """
        for name, server_info in self.servers.items():
            if server_info["status"] == "running":
                logger.info(f"Server '{name}' is already running.")
                continue
            server, args, kwargs = server_info["server"], server_info["args"], server_info["kwargs"]
            logger.info(f"Starting server '{name}' with arguments {args}...")
            server_info["status"] = "starting"
            server.run(*args, **kwargs)

            while not server.isrunning:
                logger.debug(f"Waiting for server '{name}' to start...")
                time.sleep(0.1)

            server_info["status"] = "running"
            logger.info(f"Server '{name}' is now running.")

    def stop_all_servers(self):
        """
        Stops all servers managed by the ServerManager. Blocks until each server stops.
        """
        for name, server_info in self.servers.items():
            if server_info["status"] == "stopped":
                logger.info(f"Server '{name}' is already stopped.")
                continue
            server = server_info["server"]
            logger.info(f"Shutting down server '{name}'...")
            server_info["status"] = "shutting down"
            server.stop_server()

            while server.isrunning:
                logger.debug(f"Waiting for server '{name}' to shut down...")
                time.sleep(0.1)

            server_info["status"] = "stopped"
            logger.info(f"Server '{name}' has been stopped.")

    def get_status(self, name):
        """
        Retrieves the status of a server by name.

        Args:
            name (str): The name of the server to get the status of.

        Returns:
            str: The current status of the server (e.g., 'running', 'stopped', etc.).

        Raises:
            ValueError: If no server with the specified name exists.
        """
        server_info = self.get_server(name)
        if not server_info:
            raise ValueError(f"No server found with name '{name}'.")
        return server_info["status"]
