"""Qt adapter over the (Qt-free) T3RDriver.

The driver fires its callbacks on the reader thread.  This adapter turns
each one into a Qt signal emitted from that thread; because the adapter
lives on the GUI thread, Qt queues the delivery and slots run on the GUI
thread — which is what widget code requires.

Command methods are forwarded to the driver, so panels can hold the adapter
alone and use it exactly like the old QObject driver.
"""

from __future__ import annotations

from PyQt6.QtCore import QObject, pyqtSignal

from hardware.t3r_driver import T3RDriver


class QtT3RAdapter(QObject):
    port_opened = pyqtSignal()
    handshake_ok = pyqtSignal(int, int, int)   # proto_ver, fw_ver, num_channels
    disconnected = pyqtSignal(str)             # reason ("" = user-initiated)
    info_updated = pyqtSignal(int, object)     # ch, proto.Info
    drv_status_updated = pyqtSignal(int, object)
    position_updated = pyqtSignal(int, int)
    motion_done = pyqtSignal(int, int)
    stopped = pyqtSignal(int, int)
    fault_occurred = pyqtSignal(int, int)
    ack_received = pyqtSignal(int, int)
    frame_received = pyqtSignal(int, bytes)

    _EVENTS = ("port_opened", "handshake_ok", "disconnected", "info_updated",
               "drv_status_updated", "position_updated", "motion_done",
               "stopped", "fault_occurred", "ack_received", "frame_received")

    def __init__(self, driver: T3RDriver | None = None, parent=None):
        super().__init__(parent)
        self.driver = driver if driver is not None else T3RDriver()
        for name in self._EVENTS:
            getattr(self.driver, name).connect(getattr(self, name).emit)

    # Class attributes (constants) the panels read off the driver
    CHANNEL_NAMES = T3RDriver.CHANNEL_NAMES
    GR_AXIS_CH = T3RDriver.GR_AXIS_CH

    @property
    def is_open(self) -> bool:
        return self.driver.is_open

    def __getattr__(self, name):
        # Only reached for attributes this QObject doesn't define, i.e. the
        # driver's command API (open/close/move/jog/enable/...).
        if name.startswith("_"):
            raise AttributeError(name)
        return getattr(object.__getattribute__(self, "driver"), name)