"""
TCP Command Service — Abstraction layer for sending commands to devices via TCP.

Breaks the circular import between routers/commands.py and tcp_server.py
by lazily importing tcp_manager only when needed.
"""

import logging

logger = logging.getLogger(__name__)


def _get_tcp_manager():
    """Lazily import tcp_manager to avoid circular imports."""
    from app.tcp_server import tcp_manager
    return tcp_manager


def is_device_online(imei: str) -> bool:
    """Check if a device is currently connected via TCP."""
    return imei in _get_tcp_manager().connections


async def send_command(imei: str, command_type: str, command_content: str) -> bool:
    """Send an online command (0x80) to a connected device."""
    return await _get_tcp_manager().send_command(imei, command_type, command_content)


async def send_message(imei: str, message: str) -> bool:
    """Send a text message (0x82) to a connected device."""
    return await _get_tcp_manager().send_message(imei, message)