bambuddy/backend/tests/unit/services/test_printer_manager.py

"""Unit tests for PrinterManager service.

Tests printer connection management, status tracking, and print control.
"""

import logging
from unittest.mock import AsyncMock, MagicMock, patch

import pytest

from backend.app.services.printer_manager import (
    PrinterManager,
    get_derived_status_name,
    has_stg_cur_idle_bug,
    init_printer_connections,
    parse_plate_id,
    printer_state_to_dict,
    supports_chamber_temp,
    supports_drying,
)


class TestPrinterManager:
    """Tests for PrinterManager class."""

    @pytest.fixture
    def manager(self):
        """Create a fresh PrinterManager instance."""
        return PrinterManager()

    @pytest.fixture
    def mock_printer(self):
        """Create a mock Printer object."""
        printer = MagicMock()
        printer.id = 1
        printer.ip_address = "192.168.1.100"
        printer.serial_number = "00M09A123456789"
        printer.access_code = "12345678"
        printer.is_active = True
        return printer

    @pytest.fixture
    def mock_client(self):
        """Create a mock BambuMQTTClient."""
        client = MagicMock()
        client.state = MagicMock()
        client.state.connected = True
        client.state.state = "IDLE"
        client.state.progress = 0
        client.state.temperatures = {"nozzle": 25, "bed": 25}
        client.state.raw_data = {}
        client.logging_enabled = False
        return client

    # ========================================================================
    # Tests for initialization
    # ========================================================================

    def test_init_creates_empty_clients_dict(self, manager):
        """Verify manager initializes with empty clients dict."""
        assert manager._clients == {}

    def test_init_callbacks_are_none(self, manager):
        """Verify all callbacks are initially None."""
        assert manager._on_print_start is None
        assert manager._on_print_complete is None
        assert manager._on_status_change is None
        assert manager._on_ams_change is None

    def test_init_loop_is_none(self, manager):
        """Verify event loop is initially None."""
        assert manager._loop is None

    # ========================================================================
    # Tests for callback setters
    # ========================================================================

    def test_set_event_loop(self, manager):
        """Verify event loop can be set."""
        mock_loop = MagicMock()
        manager.set_event_loop(mock_loop)
        assert manager._loop == mock_loop

    def test_set_print_start_callback(self, manager):
        """Verify print start callback can be set."""
        callback = MagicMock()
        manager.set_print_start_callback(callback)
        assert manager._on_print_start == callback

    def test_set_print_complete_callback(self, manager):
        """Verify print complete callback can be set."""
        callback = MagicMock()
        manager.set_print_complete_callback(callback)
        assert manager._on_print_complete == callback

    def test_set_status_change_callback(self, manager):
        """Verify status change callback can be set."""
        callback = MagicMock()
        manager.set_status_change_callback(callback)
        assert manager._on_status_change == callback

    def test_set_ams_change_callback(self, manager):
        """Verify AMS change callback can be set."""
        callback = MagicMock()
        manager.set_ams_change_callback(callback)
        assert manager._on_ams_change == callback

    # ========================================================================
    # Tests for _schedule_async
    # ========================================================================

    def test_schedule_async_with_running_loop(self, manager):
        """Verify async coroutine is scheduled when loop is running."""
        mock_loop = MagicMock()
        mock_loop.is_running.return_value = True
        manager._loop = mock_loop

        async def dummy_coro():
            pass

        coro = dummy_coro()
        manager._schedule_async(coro)

        mock_loop.is_running.assert_called_once()
        # Clean up the coroutine
        coro.close()

    def test_schedule_async_without_loop(self, manager):
        """Verify nothing happens when no loop is set."""

        async def dummy_coro():
            pass

        coro = dummy_coro()
        # Should not raise
        manager._schedule_async(coro)
        coro.close()

    def test_schedule_async_with_stopped_loop(self, manager):
        """Verify nothing happens when loop is not running."""
        mock_loop = MagicMock()
        mock_loop.is_running.return_value = False
        manager._loop = mock_loop

        async def dummy_coro():
            pass

        coro = dummy_coro()
        manager._schedule_async(coro)
        coro.close()

    # ========================================================================
    # Tests for connect_printer
    # ========================================================================

    @pytest.mark.asyncio
    async def test_connect_printer_creates_client(self, manager, mock_printer):
        """Verify connecting creates an MQTT client."""
        with patch("backend.app.services.printer_manager.BambuMQTTClient") as MockClient:
            mock_instance = MagicMock()
            mock_instance.state = MagicMock()
            mock_instance.state.connected = True
            MockClient.return_value = mock_instance

            result = await manager.connect_printer(mock_printer)

            MockClient.assert_called_once()
            mock_instance.connect.assert_called_once()
            assert mock_printer.id in manager._clients
            assert result is True

    @pytest.mark.asyncio
    async def test_connect_printer_disconnects_existing(self, manager, mock_printer, mock_client):
        """Verify connecting disconnects existing client first."""
        manager._clients[mock_printer.id] = mock_client

        with patch("backend.app.services.printer_manager.BambuMQTTClient") as MockClient:
            new_client = MagicMock()
            new_client.state = MagicMock()
            new_client.state.connected = True
            MockClient.return_value = new_client

            await manager.connect_printer(mock_printer)

            mock_client.disconnect.assert_called_once()

    @pytest.mark.asyncio
    async def test_connect_printer_returns_false_on_failure(self, manager, mock_printer):
        """Verify returns False when connection fails."""
        with patch("backend.app.services.printer_manager.BambuMQTTClient") as MockClient:
            mock_instance = MagicMock()
            mock_instance.state = MagicMock()
            mock_instance.state.connected = False
            MockClient.return_value = mock_instance

            result = await manager.connect_printer(mock_printer)

            assert result is False

    # ========================================================================
    # Tests for disconnect_printer
    # ========================================================================

    def test_disconnect_printer_removes_client(self, manager, mock_client):
        """Verify disconnecting removes and disconnects client."""
        manager._clients[1] = mock_client

        manager.disconnect_printer(1)

        mock_client.disconnect.assert_called_once()
        assert 1 not in manager._clients

    def test_disconnect_printer_handles_missing(self, manager):
        """Verify disconnecting non-existent printer doesn't raise."""
        manager.disconnect_printer(999)  # Should not raise

    # ========================================================================
    # Tests for disconnect_all
    # ========================================================================

    def test_disconnect_all_disconnects_all_clients(self, manager):
        """Verify all clients are disconnected."""
        client1 = MagicMock()
        client2 = MagicMock()
        manager._clients[1] = client1
        manager._clients[2] = client2

        manager.disconnect_all()

        client1.disconnect.assert_called_once()
        client2.disconnect.assert_called_once()
        assert len(manager._clients) == 0

    # ========================================================================
    # Tests for get_status
    # ========================================================================

    def test_get_status_returns_state(self, manager, mock_client):
        """Verify get_status returns client state."""
        manager._clients[1] = mock_client

        result = manager.get_status(1)

        mock_client.check_staleness.assert_called_once()
        assert result == mock_client.state

    def test_get_status_returns_none_for_unknown(self, manager):
        """Verify get_status returns None for unknown printer."""
        result = manager.get_status(999)
        assert result is None

    # ========================================================================
    # Tests for get_all_statuses
    # ========================================================================

    def test_get_all_statuses_returns_all(self, manager):
        """Verify all statuses are returned."""
        client1 = MagicMock()
        client1.state = MagicMock(connected=True)
        client2 = MagicMock()
        client2.state = MagicMock(connected=False)
        manager._clients[1] = client1
        manager._clients[2] = client2

        result = manager.get_all_statuses()

        assert len(result) == 2
        assert 1 in result
        assert 2 in result
        client1.check_staleness.assert_called_once()
        client2.check_staleness.assert_called_once()

    # ========================================================================
    # Tests for is_connected
    # ========================================================================

    def test_is_connected_returns_true(self, manager, mock_client):
        """Verify is_connected returns True for connected printer."""
        mock_client.check_staleness.return_value = True
        manager._clients[1] = mock_client

        result = manager.is_connected(1)

        assert result is True

    def test_is_connected_returns_false_for_unknown(self, manager):
        """Verify is_connected returns False for unknown printer."""
        result = manager.is_connected(999)
        assert result is False

    # ========================================================================
    # Tests for get_client
    # ========================================================================

    def test_get_client_returns_client(self, manager, mock_client):
        """Verify get_client returns the client."""
        manager._clients[1] = mock_client

        result = manager.get_client(1)

        assert result == mock_client

    def test_get_client_returns_none_for_unknown(self, manager):
        """Verify get_client returns None for unknown printer."""
        result = manager.get_client(999)
        assert result is None

    # ========================================================================
    # Tests for mark_printer_offline
    # ========================================================================

    def test_mark_printer_offline_updates_state(self, manager, mock_client):
        """Verify mark_printer_offline updates client state."""
        mock_client.state.connected = True
        manager._clients[1] = mock_client

        manager.mark_printer_offline(1)

        assert mock_client.state.connected is False
        assert mock_client.state.state == "unknown"

    def test_mark_printer_offline_triggers_callback(self, manager, mock_client):
        """Verify mark_printer_offline triggers status callback."""
        mock_client.state.connected = True
        manager._clients[1] = mock_client

        # Callback must return a coroutine
        async def async_callback(printer_id, state):
            pass

        manager._on_status_change = async_callback

        # Need a running loop for callback
        mock_loop = MagicMock()
        mock_loop.is_running.return_value = True
        manager._loop = mock_loop

        manager.mark_printer_offline(1)

        # Callback should be scheduled via run_coroutine_threadsafe
        mock_loop.is_running.assert_called()
        # State should be updated
        assert mock_client.state.connected is False

    def test_mark_printer_offline_handles_unknown(self, manager):
        """Verify mark_printer_offline handles unknown printer."""
        manager.mark_printer_offline(999)  # Should not raise

    def test_mark_printer_offline_skips_already_offline(self, manager, mock_client):
        """Verify mark_printer_offline skips already offline printer."""
        mock_client.state.connected = False
        manager._clients[1] = mock_client

        manager.mark_printer_offline(1)

        # State should remain unchanged
        assert mock_client.state.connected is False

    # ========================================================================
    # Tests for start_print
    # ========================================================================

    def test_start_print_calls_client(self, manager, mock_client):
        """Verify start_print calls client method."""
        mock_client.start_print.return_value = True
        manager._clients[1] = mock_client

        result = manager.start_print(1, "test.gcode")

        mock_client.start_print.assert_called_once_with(
            "test.gcode",
            1,
            ams_mapping=None,
            timelapse=False,
            bed_levelling=True,
            flow_cali=False,
            vibration_cali=True,
            layer_inspect=False,
            use_ams=True,
        )
        assert result is True

    def test_start_print_returns_false_for_unknown(self, manager):
        """Verify start_print returns False for unknown printer."""
        result = manager.start_print(999, "test.gcode")
        assert result is False

    def test_start_print_logs_print_command_with_caller(self, manager, mock_client, caplog):
        """Verify start_print logs PRINT COMMAND with caller info (#374)."""
        mock_client.start_print.return_value = True
        manager._clients[1] = mock_client

        with caplog.at_level(logging.INFO, logger="backend.app.services.printer_manager"):
            manager.start_print(1, "benchy.3mf")

        print_cmd_logs = [r for r in caplog.records if "PRINT COMMAND" in r.message]
        assert len(print_cmd_logs) == 1
        log_msg = print_cmd_logs[0].message
        assert "printer=1" in log_msg
        assert "file=benchy.3mf" in log_msg
        assert "caller=" in log_msg

    def test_start_print_logs_even_when_printer_unknown(self, manager, caplog):
        """Verify PRINT COMMAND is logged even for unknown printers (#374)."""
        with caplog.at_level(logging.INFO, logger="backend.app.services.printer_manager"):
            result = manager.start_print(999, "ghost.3mf")

        assert result is False
        print_cmd_logs = [r for r in caplog.records if "PRINT COMMAND" in r.message]
        assert len(print_cmd_logs) == 1

    # ========================================================================
    # Tests for stop_print
    # ========================================================================

    def test_stop_print_calls_client(self, manager, mock_client):
        """Verify stop_print calls client method."""
        mock_client.stop_print.return_value = True
        manager._clients[1] = mock_client

        result = manager.stop_print(1)

        mock_client.stop_print.assert_called_once()
        assert result is True

    def test_stop_print_returns_false_for_unknown(self, manager):
        """Verify stop_print returns False for unknown printer."""
        result = manager.stop_print(999)
        assert result is False

    # ========================================================================
    # Tests for wait_for_cooldown
    # ========================================================================

    @pytest.mark.asyncio
    async def test_wait_for_cooldown_returns_true_when_cool(self, manager, mock_client):
        """Verify wait_for_cooldown returns True when printer is cool."""
        mock_client.state.connected = True
        mock_client.state.temperatures = {"nozzle": 40, "bed": 30}
        mock_client.check_staleness.return_value = True
        manager._clients[1] = mock_client

        result = await manager.wait_for_cooldown(1, target_temp=50)

        assert result is True

    @pytest.mark.asyncio
    async def test_wait_for_cooldown_returns_false_on_disconnect(self, manager, mock_client):
        """Verify wait_for_cooldown returns False when printer disconnects."""
        mock_client.state.connected = False
        mock_client.check_staleness.return_value = False
        manager._clients[1] = mock_client

        result = await manager.wait_for_cooldown(1, target_temp=50, timeout=1)

        assert result is False

    @pytest.mark.asyncio
    async def test_wait_for_cooldown_returns_false_for_unknown(self, manager):
        """Verify wait_for_cooldown returns False for unknown printer."""
        result = await manager.wait_for_cooldown(999, target_temp=50, timeout=1)
        assert result is False

    @pytest.mark.asyncio
    async def test_wait_for_cooldown_checks_both_nozzles(self, manager, mock_client):
        """Verify wait_for_cooldown checks both nozzles for dual extruders."""
        mock_client.state.connected = True
        mock_client.state.temperatures = {"nozzle": 40, "nozzle_2": 45, "bed": 30}
        mock_client.check_staleness.return_value = True
        manager._clients[1] = mock_client

        result = await manager.wait_for_cooldown(1, target_temp=50)

        assert result is True

    # ========================================================================
    # Tests for logging methods
    # ========================================================================

    def test_enable_logging_calls_client(self, manager, mock_client):
        """Verify enable_logging calls client method."""
        manager._clients[1] = mock_client

        result = manager.enable_logging(1, True)

        mock_client.enable_logging.assert_called_once_with(True)
        assert result is True

    def test_enable_logging_returns_false_for_unknown(self, manager):
        """Verify enable_logging returns False for unknown printer."""
        result = manager.enable_logging(999, True)
        assert result is False

    def test_get_logs_returns_logs(self, manager, mock_client):
        """Verify get_logs returns client logs."""
        mock_logs = [MagicMock(), MagicMock()]
        mock_client.get_logs.return_value = mock_logs
        manager._clients[1] = mock_client

        result = manager.get_logs(1)

        assert result == mock_logs

    def test_get_logs_returns_empty_for_unknown(self, manager):
        """Verify get_logs returns empty list for unknown printer."""
        result = manager.get_logs(999)
        assert result == []

    def test_clear_logs_calls_client(self, manager, mock_client):
        """Verify clear_logs calls client method."""
        manager._clients[1] = mock_client

        result = manager.clear_logs(1)

        mock_client.clear_logs.assert_called_once()
        assert result is True

    def test_clear_logs_returns_false_for_unknown(self, manager):
        """Verify clear_logs returns False for unknown printer."""
        result = manager.clear_logs(999)
        assert result is False

    def test_is_logging_enabled_returns_status(self, manager, mock_client):
        """Verify is_logging_enabled returns client status."""
        mock_client.logging_enabled = True
        manager._clients[1] = mock_client

        result = manager.is_logging_enabled(1)

        assert result is True

    def test_is_logging_enabled_returns_false_for_unknown(self, manager):
        """Verify is_logging_enabled returns False for unknown printer."""
        result = manager.is_logging_enabled(999)
        assert result is False

    # ========================================================================
    # Tests for request_status_update
    # ========================================================================

    def test_request_status_update_calls_client(self, manager, mock_client):
        """Verify request_status_update calls client method."""
        mock_client.request_status_update.return_value = True
        manager._clients[1] = mock_client

        result = manager.request_status_update(1)

        mock_client.request_status_update.assert_called_once()
        assert result is True

    def test_request_status_update_returns_false_for_unknown(self, manager):
        """Verify request_status_update returns False for unknown printer."""
        result = manager.request_status_update(999)
        assert result is False

    # ========================================================================
    # Tests for test_connection
    # ========================================================================

    @pytest.mark.asyncio
    async def test_test_connection_success(self, manager):
        """Verify test_connection returns success on connection."""
        with patch("backend.app.services.printer_manager.BambuMQTTClient") as MockClient:
            mock_instance = MagicMock()
            mock_instance.state = MagicMock()
            mock_instance.state.connected = True
            mock_instance.state.state = "IDLE"
            mock_instance.state.raw_data = {"device_model": "X1C"}
            MockClient.return_value = mock_instance

            result = await manager.test_connection("192.168.1.100", "00M09A123456789", "12345678")

            assert result["success"] is True
            assert result["state"] == "IDLE"
            assert result["model"] == "X1C"
            mock_instance.disconnect.assert_called_once()

    @pytest.mark.asyncio
    async def test_test_connection_failure(self, manager):
        """Verify test_connection returns failure on connection error."""
        with patch("backend.app.services.printer_manager.BambuMQTTClient") as MockClient:
            mock_instance = MagicMock()
            mock_instance.state = MagicMock()
            mock_instance.state.connected = False
            MockClient.return_value = mock_instance

            result = await manager.test_connection("192.168.1.100", "00M09A123456789", "12345678")

            assert result["success"] is False
            assert result["state"] is None
            mock_instance.disconnect.assert_called_once()

    # ========================================================================
    # Tests for current print user tracking (Issue #206)
    # ========================================================================

    def test_set_current_print_user(self, manager):
        """Verify current print user can be set."""
        manager.set_current_print_user(1, 42, "testuser")

        assert 1 in manager._current_print_user
        assert manager._current_print_user[1]["user_id"] == 42
        assert manager._current_print_user[1]["username"] == "testuser"

    def test_get_current_print_user_returns_user(self, manager):
        """Verify get_current_print_user returns the stored user."""
        manager.set_current_print_user(1, 42, "testuser")

        result = manager.get_current_print_user(1)

        assert result is not None
        assert result["user_id"] == 42
        assert result["username"] == "testuser"

    def test_get_current_print_user_returns_none_for_unknown(self, manager):
        """Verify get_current_print_user returns None for unknown printer."""
        result = manager.get_current_print_user(999)
        assert result is None

    def test_clear_current_print_user(self, manager):
        """Verify current print user can be cleared."""
        manager.set_current_print_user(1, 42, "testuser")
        manager.clear_current_print_user(1)

        result = manager.get_current_print_user(1)
        assert result is None

    def test_clear_current_print_user_no_error_for_unknown(self, manager):
        """Verify clearing unknown printer doesn't raise error."""
        # Should not raise
        manager.clear_current_print_user(999)

    def test_set_current_print_user_overwrites_existing(self, manager):
        """Verify setting user overwrites existing value."""
        manager.set_current_print_user(1, 42, "user1")
        manager.set_current_print_user(1, 99, "user2")

        result = manager.get_current_print_user(1)
        assert result["user_id"] == 99
        assert result["username"] == "user2"

    def test_multiple_printers_have_separate_users(self, manager):
        """Verify each printer tracks its own user separately."""
        manager.set_current_print_user(1, 42, "user1")
        manager.set_current_print_user(2, 99, "user2")

        result1 = manager.get_current_print_user(1)
        result2 = manager.get_current_print_user(2)

        assert result1["username"] == "user1"
        assert result2["username"] == "user2"


class TestPrinterStateToDict:
    """Tests for printer_state_to_dict helper function."""

    @pytest.fixture
    def mock_state(self):
        """Create a mock PrinterState."""
        state = MagicMock()
        state.connected = True
        state.state = "RUNNING"
        state.current_print = "test.3mf"
        state.subtask_name = "Test Print"
        state.gcode_file = "/sdcard/test.gcode"
        state.progress = 50
        state.remaining_time = 3600
        state.layer_num = 10
        state.total_layers = 20
        state.temperatures = {"nozzle": 200, "bed": 60}
        state.hms_errors = []
        state.ams_status_main = 0
        state.ams_status_sub = 0
        state.tray_now = "1"
        state.wifi_signal = -50
        state.raw_data = {}
        state.stg_cur = -1  # No calibration stage active
        state.firmware_version = None
        return state

    def test_basic_conversion(self, mock_state):
        """Verify basic state fields are converted."""
        result = printer_state_to_dict(mock_state)

        assert result["connected"] is True
        assert result["state"] == "RUNNING"
        assert result["progress"] == 50
        assert result["temperatures"] == {"nozzle": 200, "bed": 60}

    def test_ams_data_parsing(self, mock_state):
        """Verify AMS data is parsed correctly."""
        mock_state.raw_data = {
            "ams": [
                {
                    "id": 0,
                    "humidity_raw": 45,
                    "temp": 25,
                    "tray": [
                        {
                            "id": 0,
                            "tray_color": "FF0000",
                            "tray_type": "PLA",
                            "tray_sub_brands": "Generic",
                            "remain": 80,
                            "k": 0.5,
                            "tag_uid": "ABC123",
                            "tray_uuid": "uuid-123",
                        }
                    ],
                }
            ]
        }

        result = printer_state_to_dict(mock_state)

        assert result["ams"] is not None
        assert len(result["ams"]) == 1
        assert result["ams"][0]["humidity"] == 45
        assert len(result["ams"][0]["tray"]) == 1
        assert result["ams"][0]["tray"][0]["tray_color"] == "FF0000"

    def test_empty_tag_uid_becomes_none(self, mock_state):
        """Verify empty tag_uid is converted to None."""
        mock_state.raw_data = {
            "ams": [
                {
                    "id": 0,
                    "tray": [
                        {
                            "id": 0,
                            "tag_uid": "",
                            "tray_uuid": "00000000000000000000000000000000",
                        }
                    ],
                }
            ]
        }

        result = printer_state_to_dict(mock_state)

        assert result["ams"][0]["tray"][0]["tag_uid"] is None
        assert result["ams"][0]["tray"][0]["tray_uuid"] is None

    def test_zero_tag_uid_becomes_none(self, mock_state):
        """Verify zero tag_uid is converted to None."""
        mock_state.raw_data = {
            "ams": [
                {
                    "id": 0,
                    "tray": [
                        {
                            "id": 0,
                            "tag_uid": "0000000000000000",
                        }
                    ],
                }
            ]
        }

        result = printer_state_to_dict(mock_state)

        assert result["ams"][0]["tray"][0]["tag_uid"] is None

    def test_vt_tray_parsing(self, mock_state):
        """Verify virtual tray is parsed correctly as a list."""
        mock_state.raw_data = {
            "vt_tray": [
                {
                    "tray_color": "00FF00",
                    "tray_type": "PETG",
                    "tray_sub_brands": "Generic",
                    "remain": 60,
                    "tag_uid": "VT123",
                }
            ]
        }

        result = printer_state_to_dict(mock_state)

        assert isinstance(result["vt_tray"], list)
        assert len(result["vt_tray"]) == 1
        assert result["vt_tray"][0]["id"] == 254
        assert result["vt_tray"][0]["tray_color"] == "00FF00"
        assert result["vt_tray"][0]["tray_type"] == "PETG"

    def test_vt_tray_dict_normalized_to_list(self, mock_state):
        """Verify vt_tray as a raw dict (from MQTT) is normalized to a list."""
        mock_state.raw_data = {
            "vt_tray": {
                "id": "254",
                "tray_color": "FF0000",
                "tray_type": "PLA",
                "tray_sub_brands": "Generic",
                "tag_uid": "0000000000000000",
                "tray_uuid": "00000000000000000000000000000000",
                "remain": 0,
            }
        }

        result = printer_state_to_dict(mock_state)

        assert isinstance(result["vt_tray"], list)
        assert len(result["vt_tray"]) == 1
        assert result["vt_tray"][0]["tray_color"] == "FF0000"
        assert result["vt_tray"][0]["tray_type"] == "PLA"
        assert result["vt_tray"][0]["tag_uid"] is None
        assert result["vt_tray"][0]["tray_uuid"] is None

    def test_vt_tray_non_list_non_dict_ignored(self, mock_state):
        """Verify unexpected vt_tray types (e.g. string) produce empty list."""
        mock_state.raw_data = {"vt_tray": "unexpected_string"}

        result = printer_state_to_dict(mock_state)

        assert result["vt_tray"] == []

    def test_hms_errors_conversion(self, mock_state):
        """Verify HMS errors are converted correctly."""
        error = MagicMock()
        error.code = "0700_0100"
        error.attr = 1
        error.module = "AMS"
        error.severity = 2
        mock_state.hms_errors = [error]

        result = printer_state_to_dict(mock_state)

        assert len(result["hms_errors"]) == 1
        assert result["hms_errors"][0]["code"] == "0700_0100"
        assert result["hms_errors"][0]["module"] == "AMS"

    def test_cover_url_added_for_running_print(self, mock_state):
        """Verify cover_url is added for running prints."""
        result = printer_state_to_dict(mock_state, printer_id=1)

        assert result["cover_url"] == "/api/v1/printers/1/cover"

    def test_current_plate_id_extracted_from_gcode_file(self, mock_state):
        """Verify current_plate_id is parsed from a Bambu plate path (#881)."""
        mock_state.gcode_file = "/Metadata/plate_3.gcode"

        result = printer_state_to_dict(mock_state)

        assert result["current_plate_id"] == 3

    def test_current_plate_id_none_when_no_plate_segment(self, mock_state):
        """Verify current_plate_id stays None when gcode_file has no plate marker."""
        mock_state.gcode_file = "/sdcard/test.gcode"

        result = printer_state_to_dict(mock_state)

        assert result["current_plate_id"] is None

    def test_cover_url_none_when_not_running(self, mock_state):
        """Verify cover_url is None when not printing."""
        mock_state.state = "IDLE"

        result = printer_state_to_dict(mock_state, printer_id=1)

        assert result["cover_url"] is None

    def test_ams_ht_detection(self, mock_state):
        """Verify AMS-HT is detected (1 tray vs 4)."""
        mock_state.raw_data = {
            "ams": [
                {
                    "id": 0,
                    "tray": [{"id": 0}],  # Only 1 tray = AMS-HT
                }
            ]
        }

        result = printer_state_to_dict(mock_state)

        assert result["ams"][0]["is_ams_ht"] is True

    def test_regular_ams_detection(self, mock_state):
        """Verify regular AMS is detected (4 trays)."""
        mock_state.raw_data = {"ams": [{"id": 0, "tray": [{"id": 0}, {"id": 1}, {"id": 2}, {"id": 3}]}]}

        result = printer_state_to_dict(mock_state)

        assert result["ams"][0]["is_ams_ht"] is False

    def test_chamber_temp_filtered_for_p1s(self, mock_state):
        """Verify chamber temperature is filtered out for P1S (no chamber sensor)."""
        mock_state.temperatures = {
            "nozzle": 200,
            "bed": 60,
            "chamber": 5,
            "chamber_target": 0,
            "chamber_heating": False,
        }

        result = printer_state_to_dict(mock_state, model="P1S")

        assert "chamber" not in result["temperatures"]
        assert "chamber_target" not in result["temperatures"]
        assert "chamber_heating" not in result["temperatures"]
        assert result["temperatures"]["nozzle"] == 200
        assert result["temperatures"]["bed"] == 60

    def test_chamber_temp_kept_for_x1c(self, mock_state):
        """Verify chamber temperature is kept for X1C (has chamber sensor)."""
        mock_state.temperatures = {
            "nozzle": 200,
            "bed": 60,
            "chamber": 25,
            "chamber_target": 45,
            "chamber_heating": True,
        }

        result = printer_state_to_dict(mock_state, model="X1C")

        assert result["temperatures"]["chamber"] == 25
        assert result["temperatures"]["chamber_target"] == 45
        assert result["temperatures"]["chamber_heating"] is True

    def test_chamber_temp_filtered_for_a1(self, mock_state):
        """Verify chamber temperature is filtered out for A1 (no chamber sensor)."""
        mock_state.temperatures = {"nozzle": 200, "bed": 60, "chamber": 5}

        result = printer_state_to_dict(mock_state, model="A1")

        assert "chamber" not in result["temperatures"]

    def test_chamber_temp_kept_when_no_model(self, mock_state):
        """Verify chamber temperature is kept when model is not specified (conservative approach)."""
        mock_state.temperatures = {"nozzle": 200, "bed": 60, "chamber": 25}

        result = printer_state_to_dict(mock_state)  # No model specified

        # When model is unknown, we can't filter - leave as is
        # Actually supports_chamber_temp returns False for None, so it will filter
        # Let's check the actual behavior
        assert "chamber" not in result["temperatures"]

    def test_ams_drying_fields_included(self, mock_state):
        """Verify AMS drying fields (dry_time, module_type) are included in output."""
        mock_state.raw_data = {
            "ams": [
                {
                    "id": 0,
                    "dry_time": 42,
                    "module_type": "n3f",
                    "tray": [
                        {
                            "id": 0,
                            "tray_color": "FF0000",
                            "tray_type": "PLA",
                            "drying_temp": 55,
                            "drying_time": 240,
                        }
                    ],
                }
            ]
        }

        result = printer_state_to_dict(mock_state)

        ams_unit = result["ams"][0]
        assert ams_unit["dry_time"] == 42
        assert ams_unit["module_type"] == "n3f"
        # Tray-level drying fields
        tray = ams_unit["tray"][0]
        assert tray["drying_temp"] == 55
        assert tray["drying_time"] == 240

    def test_awaiting_plate_clear_defaults_false(self, mock_state):
        """Without a printer_id, awaiting_plate_clear is False (no lookup possible)."""
        result = printer_state_to_dict(mock_state)
        assert result["awaiting_plate_clear"] is False

    def test_awaiting_plate_clear_surfaced_when_set(self, mock_state):
        """With printer_id, awaiting_plate_clear reflects PrinterManager state.

        Regression: PR #939 left this flag off the WebSocket payload, so the
        "Clear Plate" button only appeared after the 30 s REST fallback poll.
        """
        from backend.app.services.printer_manager import printer_manager

        printer_manager.set_awaiting_plate_clear(12345, True)
        try:
            result = printer_state_to_dict(mock_state, printer_id=12345)
            assert result["awaiting_plate_clear"] is True
        finally:
            printer_manager.set_awaiting_plate_clear(12345, False)

    def test_name_and_model_surfaced_when_registered(self, mock_state):
        """Registered PrinterInfo name + model arg should land in the WS payload.

        Regression for #963 follow-up: without this, the gcode viewer's printer
        selector had to wait on a /printers fetch before it could render real
        names, and the initial WS snapshot showed "Printer 1" fallbacks.
        """
        from backend.app.services.printer_manager import PrinterInfo, printer_manager

        # Register a stub PrinterInfo; the real manager writes this on connect.
        printer_manager._printer_info[98765] = PrinterInfo(name="My X1C", serial_number="01S00-0")
        try:
            result = printer_state_to_dict(mock_state, printer_id=98765, model="X1C")
            assert result["name"] == "My X1C"
            assert result["model"] == "X1C"
        finally:
            printer_manager._printer_info.pop(98765, None)

    def test_name_and_model_absent_when_no_printer_id(self, mock_state):
        """Without a printer_id (unusual callsites), name/model keys stay absent.

        The consumers (gcode viewer, frontend card) tolerate missing keys; what
        they can't tolerate is an unrelated printer's name accidentally leaking
        into a status meant for a different one.
        """
        result = printer_state_to_dict(mock_state)
        assert "name" not in result
        assert "model" not in result

    def test_model_absent_when_arg_is_none(self, mock_state):
        """`model` arg=None must not plant a `model` key at all.

        If the arg is None, callers didn't know the model yet; emitting a
        `model: null` field would overwrite a good value cached client-side.
        """
        from backend.app.services.printer_manager import PrinterInfo, printer_manager

        printer_manager._printer_info[55555] = PrinterInfo(name="N", serial_number="S")
        try:
            result = printer_state_to_dict(mock_state, printer_id=55555, model=None)
            assert "model" not in result
            assert result["name"] == "N"
        finally:
            printer_manager._printer_info.pop(55555, None)


class TestStatusKeyDryingDedup:
    """Regression tests for WebSocket dedup including drying fields.

    The WebSocket broadcast deduplication uses printer_state_to_dict output
    to detect changes. If drying fields (like dry_time) are missing from
    the dict, changes to those fields won't trigger broadcasts.
    """

    def test_dry_time_change_changes_status_key(self):
        """Verify dry_time is present in AMS unit data so dedup can detect changes."""
        state = MagicMock()
        state.connected = True
        state.state = "IDLE"
        state.current_print = None
        state.subtask_name = None
        state.gcode_file = None
        state.progress = 0
        state.remaining_time = 0
        state.layer_num = 0
        state.total_layers = 0
        state.temperatures = {"nozzle": 25, "bed": 25}
        state.hms_errors = []
        state.ams_status_main = 0
        state.ams_status_sub = 0
        state.tray_now = None
        state.wifi_signal = -50
        state.stg_cur = -1

        # First state: drying active with 30 minutes remaining
        state.raw_data = {"ams": [{"id": 0, "dry_time": 30, "module_type": "n3f", "tray": [{"id": 0}]}]}
        result1 = printer_state_to_dict(state)

        # Second state: drying time decreased
        state.raw_data = {"ams": [{"id": 0, "dry_time": 29, "module_type": "n3f", "tray": [{"id": 0}]}]}
        result2 = printer_state_to_dict(state)

        # The dicts should differ — dry_time changed
        assert result1["ams"][0]["dry_time"] == 30
        assert result2["ams"][0]["dry_time"] == 29
        assert result1["ams"] != result2["ams"]


class TestSupportsChamberTemp:
    """Tests for supports_chamber_temp helper function."""

    def test_x1_series_supported(self):
        """Verify X1 series printers support chamber temp."""
        assert supports_chamber_temp("X1") is True
        assert supports_chamber_temp("X1C") is True
        assert supports_chamber_temp("X1E") is True

    def test_p2_series_supported(self):
        """Verify P2 series printers support chamber temp."""
        assert supports_chamber_temp("P2S") is True

    def test_h2_series_supported(self):
        """Verify H2 series printers support chamber temp."""
        assert supports_chamber_temp("H2C") is True
        assert supports_chamber_temp("H2D") is True
        assert supports_chamber_temp("H2DPRO") is True
        assert supports_chamber_temp("H2S") is True

    def test_p1_series_not_supported(self):
        """Verify P1 series printers do NOT support chamber temp."""
        assert supports_chamber_temp("P1P") is False
        assert supports_chamber_temp("P1S") is False

    def test_a1_series_not_supported(self):
        """Verify A1 series printers do NOT support chamber temp."""
        assert supports_chamber_temp("A1") is False
        assert supports_chamber_temp("A1MINI") is False

    def test_none_model_not_supported(self):
        """Verify None model returns False."""
        assert supports_chamber_temp(None) is False

    def test_case_insensitive(self):
        """Verify model matching is case-insensitive."""
        assert supports_chamber_temp("x1c") is True
        assert supports_chamber_temp("X1c") is True
        assert supports_chamber_temp("p1s") is False

    def test_internal_model_codes_supported(self):
        """Verify internal model codes from MQTT/SSDP are recognized."""
        # X1/X1C
        assert supports_chamber_temp("BL-P001") is True
        # X1E
        assert supports_chamber_temp("C13") is True
        # H2D
        assert supports_chamber_temp("O1D") is True
        # H2C
        assert supports_chamber_temp("O1C") is True
        # H2S
        assert supports_chamber_temp("O1S") is True
        # H2D Pro
        assert supports_chamber_temp("O1E") is True
        # P2S
        assert supports_chamber_temp("N7") is True

    def test_internal_model_codes_not_supported(self):
        """Verify A1/P1 internal codes are NOT supported."""
        # P1P
        assert supports_chamber_temp("C11") is False
        # P1S
        assert supports_chamber_temp("C12") is False
        # A1
        assert supports_chamber_temp("N2S") is False
        # A1 Mini
        assert supports_chamber_temp("N1") is False


class TestIsBedSlinger:
    """Tests for is_bed_slinger helper function (#1334)."""

    def test_a1_series_is_bed_slinger(self):
        """A1 / A1 Mini are open-frame bed-slingers — Z axis is the toolhead."""
        from backend.app.services.printer_manager import is_bed_slinger

        assert is_bed_slinger("A1") is True
        assert is_bed_slinger("A1 Mini") is True
        assert is_bed_slinger("A1MINI") is True
        assert is_bed_slinger("A1-MINI") is True

    def test_a1_internal_codes_recognised(self):
        """Internal MQTT/SSDP codes for A1 family must also classify as bed-slinger."""
        from backend.app.services.printer_manager import is_bed_slinger

        # A1 Mini
        assert is_bed_slinger("N1") is True
        # A1
        assert is_bed_slinger("N2S") is True

    def test_bed_on_z_models_not_bed_slingers(self):
        """X1 / P1 / H2 / H2C / H2D / H2S / P2S all have the bed on Z."""
        from backend.app.services.printer_manager import is_bed_slinger

        for model in ("X1", "X1C", "X1E", "P1P", "P1S", "P2S", "H2C", "H2D", "H2DPRO", "H2S"):
            assert is_bed_slinger(model) is False, f"{model} should NOT be classified as bed-slinger"

    def test_none_model_returns_false(self):
        from backend.app.services.printer_manager import is_bed_slinger

        assert is_bed_slinger(None) is False
        assert is_bed_slinger("") is False

    def test_case_insensitive(self):
        from backend.app.services.printer_manager import is_bed_slinger

        assert is_bed_slinger("a1") is True
        assert is_bed_slinger("a1 mini") is True
        assert is_bed_slinger("x1c") is False


class TestSupportsDrying:
    """Tests for supports_drying helper function."""

    def test_known_supported_with_firmware(self):
        """Verify known models with sufficient firmware return True."""
        assert supports_drying("X1C", "01.09.00.00") is True
        assert supports_drying("P1S", "01.08.00.00") is True
        assert supports_drying("H2D", "01.02.30.00") is True
        assert supports_drying("H2S", "01.02.00.00") is True
        assert supports_drying("P2S", "01.02.00.00") is True
        assert supports_drying("N7", "01.02.00.00") is True

    def test_known_supported_old_firmware(self):
        """Verify known models with old firmware return False."""
        assert supports_drying("X1C", "01.08.00.00") is False
        assert supports_drying("P1S", "01.07.00.00") is False
        assert supports_drying("H2S", "01.01.00.00") is False
        assert supports_drying("P2S", "01.01.99.99") is False
        assert supports_drying("N7", "01.01.99.99") is False

    def test_known_supported_no_firmware(self):
        """Verify known models with no firmware return False."""
        assert supports_drying("X1C", None) is False
        assert supports_drying("P2S", None) is False

    def test_unsupported_models(self):
        """Verify models without AMS drying support return False regardless of firmware."""
        for model in ["A1", "A1MINI", "A1-MINI", "H2C", "N1", "N2S"]:
            assert supports_drying(model, "99.99.99.99") is False, f"Expected False for {model}"

    def test_unknown_models_allowed(self):
        """Verify unknown models are allowed (graceful fallback).

        Models not in the unsupported set AND not matching any known firmware-gated
        model substring get the benefit of the doubt and return True.
        "H2D Pro" contains "H2D" so it IS firmware-gated (needs firmware).
        """
        # Truly unknown models: no substring match in _DRYING_MIN_FIRMWARE
        assert supports_drying("FUTURE_MODEL", None) is True
        # X1E contains "X1" substring, so it IS firmware-gated
        assert supports_drying("X1E", "01.09.00.00") is True
        # H2D Pro contains "H2D" substring, so it IS firmware-gated
        assert supports_drying("H2D Pro", "01.02.30.00") is True

    def test_none_model(self):
        """Verify None model returns False."""
        assert supports_drying(None, "01.09.00.00") is False

    def test_case_insensitive(self):
        """Verify model matching is case-insensitive."""
        assert supports_drying("x1c", "01.09.00.00") is True
        assert supports_drying("p2s", "01.02.00.00") is True
        assert supports_drying("a1", "99.99.99.99") is False


class TestGetDerivedStatusName:
    """Tests for get_derived_status_name function."""

    def test_stg_cur_255_returns_none(self):
        """Verify stg_cur=255 (A1/P1 idle) returns None, not 'Unknown stage (255)'."""
        state = MagicMock()
        state.stg_cur = 255
        state.state = "IDLE"

        result = get_derived_status_name(state)

        assert result is None

    def test_stg_cur_negative_one_returns_none_when_idle(self):
        """Verify stg_cur=-1 (X1 idle) returns None."""
        state = MagicMock()
        state.stg_cur = -1
        state.state = "IDLE"

        result = get_derived_status_name(state)

        assert result is None

    def test_valid_stage_returns_name(self):
        """Verify valid stg_cur values return stage name."""
        state = MagicMock()
        state.stg_cur = 1  # Auto bed leveling

        result = get_derived_status_name(state)

        assert result == "Auto bed leveling"

    def test_stg_cur_zero_returns_printing(self):
        """Verify stg_cur=0 returns 'Printing' when no model specified."""
        state = MagicMock()
        state.stg_cur = 0

        result = get_derived_status_name(state)

        assert result == "Printing"

    def test_a1_idle_with_stg_cur_zero_returns_none(self):
        """Verify A1 with IDLE state and stg_cur=0 returns None (bug workaround)."""
        state = MagicMock()
        state.stg_cur = 0
        state.state = "IDLE"

        # Test various A1 model names
        for model in ["A1", "A1 Mini", "A1-Mini", "A1MINI", "N1", "N2S"]:
            result = get_derived_status_name(state, model)
            assert result is None, f"Expected None for model {model}"

    def test_a1_running_with_stg_cur_zero_returns_printing(self):
        """Verify A1 with RUNNING state and stg_cur=0 still returns 'Printing'."""
        state = MagicMock()
        state.stg_cur = 0
        state.state = "RUNNING"

        result = get_derived_status_name(state, "A1")

        assert result == "Printing"

    def test_non_a1_idle_with_stg_cur_zero_returns_printing(self):
        """Verify non-A1 models with IDLE and stg_cur=0 still return 'Printing'."""
        state = MagicMock()
        state.stg_cur = 0
        state.state = "IDLE"

        # X1C should not get the workaround
        result = get_derived_status_name(state, "X1C")

        assert result == "Printing"


class TestHasStgCurIdleBug:
    """Tests for has_stg_cur_idle_bug function."""

    def test_a1_models_return_true(self):
        """Verify A1 model variants return True."""
        assert has_stg_cur_idle_bug("A1") is True
        assert has_stg_cur_idle_bug("A1 Mini") is True
        assert has_stg_cur_idle_bug("A1-Mini") is True
        assert has_stg_cur_idle_bug("A1MINI") is True
        assert has_stg_cur_idle_bug("a1") is True  # case insensitive
        assert has_stg_cur_idle_bug("a1 mini") is True

    def test_p1_models_return_true(self):
        """Verify P1P/P1S model variants return True."""
        assert has_stg_cur_idle_bug("P1P") is True
        assert has_stg_cur_idle_bug("P1S") is True
        assert has_stg_cur_idle_bug("p1p") is True  # case insensitive

    def test_internal_codes_return_true(self):
        """Verify internal model codes return True."""
        assert has_stg_cur_idle_bug("N1") is True  # A1 Mini
        assert has_stg_cur_idle_bug("N2S") is True  # A1
        assert has_stg_cur_idle_bug("C11") is True  # P1P
        assert has_stg_cur_idle_bug("C12") is True  # P1S

    def test_non_affected_models_return_false(self):
        """Verify non-affected models return False."""
        assert has_stg_cur_idle_bug("X1C") is False
        assert has_stg_cur_idle_bug("X1") is False
        assert has_stg_cur_idle_bug("H2D") is False

    def test_none_model_returns_false(self):
        """Verify None model returns False."""
        assert has_stg_cur_idle_bug(None) is False

    def test_empty_model_returns_false(self):
        """Verify empty model returns False."""
        assert has_stg_cur_idle_bug("") is False


class TestInitPrinterConnections:
    """Tests for init_printer_connections function."""

    @pytest.mark.asyncio
    async def test_connects_all_active_printers(self):
        """Verify all active printers are connected."""
        mock_db = AsyncMock()
        mock_printer1 = MagicMock(id=1, is_active=True)
        mock_printer2 = MagicMock(id=2, is_active=True)
        mock_result = MagicMock()
        mock_result.scalars.return_value.all.return_value = [mock_printer1, mock_printer2]
        mock_db.execute.return_value = mock_result

        with patch("backend.app.services.printer_manager.printer_manager") as mock_manager:
            mock_manager.connect_printer = AsyncMock()

            await init_printer_connections(mock_db)

            assert mock_manager.connect_printer.call_count == 2

    @pytest.mark.asyncio
    async def test_handles_empty_printer_list(self):
        """Verify empty printer list is handled."""
        mock_db = AsyncMock()
        mock_result = MagicMock()
        mock_result.scalars.return_value.all.return_value = []
        mock_db.execute.return_value = mock_result

        with patch("backend.app.services.printer_manager.printer_manager") as mock_manager:
            mock_manager.connect_printer = AsyncMock()

            await init_printer_connections(mock_db)

            mock_manager.connect_printer.assert_not_called()


class TestAmsChangeCallback:
    """Tests for AMS change callback functionality."""

    @pytest.fixture
    def manager(self):
        """Create a fresh PrinterManager instance."""
        return PrinterManager()

    def test_ams_change_callback_is_triggered(self, manager):
        """Verify AMS change callback is called when AMS data changes."""
        callback = MagicMock()
        manager.set_ams_change_callback(callback)

        # Verify callback was set
        assert manager._on_ams_change == callback

    def test_ams_change_callback_receives_correct_data(self, manager):
        """Verify AMS change callback receives the correct AMS data format."""
        received_data = []

        def capture_callback(printer_id, ams_data):
            received_data.append((printer_id, ams_data))

        manager.set_ams_change_callback(capture_callback)

        # The callback should accept printer_id and ams_data
        # This tests the callback signature
        assert manager._on_ams_change is not None
        assert callable(manager._on_ams_change)


class TestParsePlateId:
    """Tests for parse_plate_id() — active-print plate extraction from gcode paths.

    Regression coverage for #881 follow-up: the REST /status endpoint and the
    WebSocket push path both use this helper, so they must agree on the plate
    number the frontend sees.
    """

    def test_bambu_metadata_path(self):
        # Canonical path that Bambu Studio / OrcaSlicer stamp into the 3MF.
        assert parse_plate_id("/Metadata/plate_2.gcode") == 2

    def test_plate_one(self):
        assert parse_plate_id("/Metadata/plate_1.gcode") == 1

    def test_double_digit_plate(self):
        assert parse_plate_id("/Metadata/plate_12.gcode") == 12

    def test_none_input(self):
        assert parse_plate_id(None) is None

    def test_empty_string(self):
        assert parse_plate_id("") is None

    def test_path_without_plate_segment(self):
        # Some firmware / slicers report a bare filename without the plate marker.
        assert parse_plate_id("/upload/my-model.gcode") is None

    def test_similar_but_non_matching_names(self):
        # "plate.gcode" (no number) and "nameplate_2.gcode" (substring) must not
        # be mistaken for real plate markers. The regex anchors on `plate_<num>`.
        assert parse_plate_id("/Metadata/plate.gcode") is None
        assert parse_plate_id("/plates/3.gcode") is None

    def test_substring_match_still_extracts(self):
        # The regex isn't anchored to the start of a segment — any occurrence
        # wins. This matches real Bambu paths where the segment is preceded by
        # arbitrary directory noise, and matches the equivalent frontend regex.
        assert parse_plate_id("/uploads/project/plate_5.gcode.md5") == 5


class TestResolvePlateId:
    """Tests for resolve_plate_id() — plate resolution with dispatch precedence.

    Regression coverage for #1166: P1S firmware 01.10.00.00 only puts the .3mf
    filename in print.gcode_file, so parse_plate_id() returns None and the
    printer card falls back to plate 1. When Bambuddy dispatches the print
    itself we know the right plate; resolve_plate_id() prefers that record over
    the gcode_file regex when subtask_name matches.
    """

    def _make_state(self, **kwargs):
        from backend.app.services.bambu_mqtt import PrinterState

        state = PrinterState()
        for k, v in kwargs.items():
            setattr(state, k, v)
        return state

    def test_dispatched_plate_wins_when_subtask_matches(self):
        # User dispatches plate 4 via Bambuddy. Printer reflects subtask_name
        # but firmware drops the plate path from gcode_file. Without the dispatch
        # record we'd default to plate 1.
        from backend.app.services.printer_manager import resolve_plate_id

        state = self._make_state(
            gcode_file="MyModel.3mf",  # No plate path — firmware bug
            subtask_name="MyModel",
            dispatched_plate_id=4,
            dispatched_subtask="MyModel",
        )
        assert resolve_plate_id(state) == 4

    def test_dispatched_ignored_when_subtask_differs(self):
        # Bambuddy's dispatch record is for a previous print; the printer is
        # now running a different subtask (Studio-direct dispatch). The stale
        # record must not be used — fall back to gcode_file regex.
        from backend.app.services.printer_manager import resolve_plate_id

        state = self._make_state(
            gcode_file="/Metadata/plate_2.gcode",
            subtask_name="DifferentPrint",
            dispatched_plate_id=4,
            dispatched_subtask="MyModel",
        )
        assert resolve_plate_id(state) == 2

    def test_falls_back_to_gcode_regex_without_dispatch(self):
        # Studio-direct dispatch — no Bambuddy dispatch record. Existing logic
        # (parse_plate_id on gcode_file) must still work.
        from backend.app.services.printer_manager import resolve_plate_id

        state = self._make_state(
            gcode_file="/Metadata/plate_3.gcode",
            subtask_name="MyModel",
        )
        assert resolve_plate_id(state) == 3

    def test_returns_none_when_nothing_resolvable(self):
        # No dispatch record AND firmware swallowed the plate path. The route
        # uses this signal to invoke the 3MF-scan fallback.
        from backend.app.services.printer_manager import resolve_plate_id

        state = self._make_state(
            gcode_file="MyModel.3mf",
            subtask_name="MyModel",
        )
        assert resolve_plate_id(state) is None

    def test_dispatched_subtask_required_to_avoid_false_match(self):
        # dispatched_plate_id without dispatched_subtask is incomplete — we
        # can't validate it points at the current print, so we ignore it.
        from backend.app.services.printer_manager import resolve_plate_id

        state = self._make_state(
            gcode_file="MyModel.3mf",
            subtask_name="MyModel",
            dispatched_plate_id=4,
            dispatched_subtask=None,
        )
        assert resolve_plate_id(state) is None