"""
Windows Service wrapper for the RemoteLink Agent.
Installs/uninstalls/runs as a Windows Service via pywin32.

Usage:
  remotelink-agent-service.exe install
  remotelink-agent-service.exe start
  remotelink-agent-service.exe stop
  remotelink-agent-service.exe remove
"""

import sys
import os
import asyncio
import logging

# Only import win32 on Windows
if sys.platform == "win32":
    import win32serviceutil
    import win32service
    import win32event
    import servicemanager

    class RemoteLinkService(win32serviceutil.ServiceFramework):
        _svc_name_ = "RemoteLinkAgent"
        _svc_display_name_ = "RemoteLink Agent"
        _svc_description_ = "RemoteLink remote support agent service"

        def __init__(self, args):
            win32serviceutil.ServiceFramework.__init__(self, args)
            self.stop_event = win32event.CreateEvent(None, 0, 0, None)
            self._loop = None
            self._agent = None

        def SvcStop(self):
            self.ReportServiceStatus(win32service.SERVICE_STOP_PENDING)
            if self._agent:
                self._agent.stop()
            win32event.SetEvent(self.stop_event)

        def SvcDoRun(self):
            servicemanager.LogMsg(
                servicemanager.EVENTLOG_INFORMATION_TYPE,
                servicemanager.PYS_SERVICE_STARTED,
                (self._svc_name_, ""),
            )
            self._run()

        def _run(self):
            # Set up logging to Windows Event Log + file
            log_path = os.path.join(
                os.environ.get("PROGRAMDATA", "C:\\ProgramData"),
                "RemoteLink", "agent.log"
            )
            os.makedirs(os.path.dirname(log_path), exist_ok=True)
            logging.basicConfig(
                level=logging.INFO,
                format="%(asctime)s [%(levelname)s] %(message)s",
                handlers=[logging.FileHandler(log_path)],
            )

            # Import here to avoid circular issues when this module is imported
            from agent import Agent, load_config, heartbeat
            import json

            config = load_config()
            if not config:
                logging.error("No agent config found. Run enrollment first.")
                return

            self._loop = asyncio.new_event_loop()
            asyncio.set_event_loop(self._loop)

            agent = Agent(
                config["server_url"],
                config["machine_id"],
                config["access_key"],
                config.get("relay_url", ""),
            )
            self._agent = agent

            try:
                self._loop.run_until_complete(agent.run())
            finally:
                self._loop.close()


    if __name__ == "__main__":
        if len(sys.argv) == 1:
            servicemanager.Initialize()
            servicemanager.PrepareToHostSingle(RemoteLinkService)
            servicemanager.StartServiceCtrlDispatcher()
        else:
            win32serviceutil.HandleCommandLine(RemoteLinkService)

else:
    print("Windows service wrapper — only runs on Windows.")
    sys.exit(1)