bambuddy/backend/app/services/printer_manager.py

import asyncio
from typing import Callable
from dataclasses import asdict

from sqlalchemy.ext.asyncio import AsyncSession
from sqlalchemy import select

from backend.app.models.printer import Printer
from backend.app.services.bambu_mqtt import BambuMQTTClient, PrinterState, MQTTLogEntry
from backend.app.services.bambu_ftp import BambuFTPClient


class PrinterManager:
    """Manager for multiple printer connections."""

    def __init__(self):
        self._clients: dict[int, BambuMQTTClient] = {}
        self._on_print_start: Callable[[int, dict], None] | None = None
        self._on_print_complete: Callable[[int, dict], None] | None = None
        self._on_status_change: Callable[[int, PrinterState], None] | None = None
        self._loop: asyncio.AbstractEventLoop | None = None

    def set_event_loop(self, loop: asyncio.AbstractEventLoop):
        """Set the event loop for async callbacks."""
        self._loop = loop

    def set_print_start_callback(self, callback: Callable[[int, dict], None]):
        """Set callback for print start events."""
        self._on_print_start = callback

    def set_print_complete_callback(self, callback: Callable[[int, dict], None]):
        """Set callback for print completion events."""
        self._on_print_complete = callback

    def set_status_change_callback(self, callback: Callable[[int, PrinterState], None]):
        """Set callback for status change events."""
        self._on_status_change = callback

    def _schedule_async(self, coro):
        """Schedule an async coroutine from a sync context."""
        if self._loop and self._loop.is_running():
            asyncio.run_coroutine_threadsafe(coro, self._loop)

    async def connect_printer(self, printer: Printer) -> bool:
        """Connect to a printer."""
        if printer.id in self._clients:
            self.disconnect_printer(printer.id)

        printer_id = printer.id

        def on_state_change(state: PrinterState):
            if self._on_status_change:
                self._schedule_async(
                    self._on_status_change(printer_id, state)
                )

        def on_print_start(data: dict):
            if self._on_print_start:
                self._schedule_async(
                    self._on_print_start(printer_id, data)
                )

        def on_print_complete(data: dict):
            if self._on_print_complete:
                self._schedule_async(
                    self._on_print_complete(printer_id, data)
                )

        client = BambuMQTTClient(
            ip_address=printer.ip_address,
            serial_number=printer.serial_number,
            access_code=printer.access_code,
            on_state_change=on_state_change,
            on_print_start=on_print_start,
            on_print_complete=on_print_complete,
        )

        client.connect()
        self._clients[printer_id] = client

        # Wait a moment for connection
        await asyncio.sleep(1)
        return client.state.connected

    def disconnect_printer(self, printer_id: int):
        """Disconnect from a printer."""
        if printer_id in self._clients:
            self._clients[printer_id].disconnect()
            del self._clients[printer_id]

    def disconnect_all(self):
        """Disconnect from all printers."""
        for printer_id in list(self._clients.keys()):
            self.disconnect_printer(printer_id)

    def get_status(self, printer_id: int) -> PrinterState | None:
        """Get the current status of a printer."""
        if printer_id in self._clients:
            return self._clients[printer_id].state
        return None

    def get_all_statuses(self) -> dict[int, PrinterState]:
        """Get status of all connected printers."""
        return {
            printer_id: client.state
            for printer_id, client in self._clients.items()
        }

    def is_connected(self, printer_id: int) -> bool:
        """Check if a printer is connected."""
        if printer_id in self._clients:
            return self._clients[printer_id].state.connected
        return False

    def mark_printer_offline(self, printer_id: int):
        """Mark a printer as offline and trigger status callback.

        This is used when we know the printer power was cut (e.g., smart plug turned off)
        to immediately update the UI without waiting for MQTT timeout.
        """
        import logging
        logger = logging.getLogger(__name__)

        if printer_id in self._clients:
            client = self._clients[printer_id]
            if client.state.connected:
                logger.info(f"Marking printer {printer_id} as offline (smart plug power off)")
                client.state.connected = False
                client.state.state = "unknown"
                # Trigger the status change callback to broadcast via WebSocket
                if self._on_status_change:
                    self._schedule_async(self._on_status_change(printer_id, client.state))

    def start_print(self, printer_id: int, filename: str) -> bool:
        """Start a print on a connected printer."""
        if printer_id in self._clients:
            return self._clients[printer_id].start_print(filename)
        return False

    def stop_print(self, printer_id: int) -> bool:
        """Stop the current print on a connected printer."""
        if printer_id in self._clients:
            return self._clients[printer_id].stop_print()
        return False

    async def wait_for_cooldown(
        self,
        printer_id: int,
        target_temp: float = 50.0,
        timeout: int = 600,
        check_interval: int = 10,
    ) -> bool:
        """Wait for the nozzle to cool down to a safe temperature.

        Args:
            printer_id: The printer to monitor
            target_temp: Target temperature to wait for (default 50°C)
            timeout: Maximum seconds to wait (default 600s = 10 min)
            check_interval: Seconds between temperature checks (default 10s)

        Returns:
            True if cooled down, False if timeout or not connected
        """
        import logging
        logger = logging.getLogger(__name__)

        elapsed = 0
        while elapsed < timeout:
            state = self.get_status(printer_id)
            if not state or not state.connected:
                logger.warning(f"Printer {printer_id} disconnected during cooldown wait")
                return False

            # Check nozzle temperature (and nozzle_2 for dual extruders)
            nozzle_temp = state.temperatures.get("nozzle", 0)
            nozzle_2_temp = state.temperatures.get("nozzle_2", 0)
            max_temp = max(nozzle_temp, nozzle_2_temp)

            if max_temp <= target_temp:
                logger.info(f"Printer {printer_id} cooled down to {max_temp}°C")
                return True

            logger.debug(f"Printer {printer_id} nozzle at {max_temp}°C, waiting for {target_temp}°C...")
            await asyncio.sleep(check_interval)
            elapsed += check_interval

        logger.warning(f"Printer {printer_id} cooldown timeout after {timeout}s")
        return False

    def enable_logging(self, printer_id: int, enabled: bool = True) -> bool:
        """Enable or disable MQTT logging for a printer."""
        if printer_id in self._clients:
            self._clients[printer_id].enable_logging(enabled)
            return True
        return False

    def get_logs(self, printer_id: int) -> list[MQTTLogEntry]:
        """Get MQTT logs for a printer."""
        if printer_id in self._clients:
            return self._clients[printer_id].get_logs()
        return []

    def clear_logs(self, printer_id: int) -> bool:
        """Clear MQTT logs for a printer."""
        if printer_id in self._clients:
            self._clients[printer_id].clear_logs()
            return True
        return False

    def is_logging_enabled(self, printer_id: int) -> bool:
        """Check if logging is enabled for a printer."""
        if printer_id in self._clients:
            return self._clients[printer_id].logging_enabled
        return False

    async def test_connection(
        self,
        ip_address: str,
        serial_number: str,
        access_code: str,
    ) -> dict:
        """Test connection to a printer without persisting."""
        client = BambuMQTTClient(
            ip_address=ip_address,
            serial_number=serial_number,
            access_code=access_code,
        )

        try:
            client.connect()
            await asyncio.sleep(2)

            result = {
                "success": client.state.connected,
                "state": client.state.state if client.state.connected else None,
                "model": client.state.raw_data.get("device_model"),
            }
        finally:
            client.disconnect()

        return result


def printer_state_to_dict(state: PrinterState, printer_id: int | None = None) -> dict:
    """Convert PrinterState to a JSON-serializable dict."""
    result = {
        "connected": state.connected,
        "state": state.state,
        "current_print": state.current_print,
        "subtask_name": state.subtask_name,
        "gcode_file": state.gcode_file,
        "progress": state.progress,
        "remaining_time": state.remaining_time,
        "layer_num": state.layer_num,
        "total_layers": state.total_layers,
        "temperatures": state.temperatures,
        "hms_errors": [
            {"code": e.code, "module": e.module, "severity": e.severity}
            for e in (state.hms_errors or [])
        ],
    }
    # Add cover URL if there's an active print and printer_id is provided
    if printer_id and state.state == "RUNNING" and state.gcode_file:
        result["cover_url"] = f"/api/v1/printers/{printer_id}/cover"
    else:
        result["cover_url"] = None
    return result


# Global printer manager instance
printer_manager = PrinterManager()


async def init_printer_connections(db: AsyncSession):
    """Initialize connections to all active printers."""
    result = await db.execute(
        select(Printer).where(Printer.is_active == True)
    )
    printers = result.scalars().all()

    for printer in printers:
        await printer_manager.connect_printer(printer)