"""
    The TD Date/ Time ui loader
"""
# Python
import os
import can
import struct

# Qt
from PySide2                import QtCore, QtWidgets
from PySide2.QtCore         import Slot

# parent
from engine.dynamicloader   import DynamicLoader

# plugin specific
from leahi_dialin.common.msg_defs import MsgIds, MsgFieldPositions
from leahi_dialin.protocols       import CAN
from leahi_dialin.utils           import conversions

# hd Simulator
from leahi_dialin.ui.td_messaging import TD_Messaging

class Loader(DynamicLoader):
    """
    The TD Date and Time ui loader
    """

    def __init__(self):
        self.td_interface = TD_Messaging()
        self.can_interface = self.td_interface.can_interface
        super().__init__(os.path.dirname(__file__))

        if self.can_interface is not None:
            channel_id = CAN.DenaliChannels.ui_to_td_ch_id
            td_date_request_message_id = MsgIds.MSG_ID_TD_DATE_AND_TIME_REQUEST.value
            self.can_interface.register_receiving_publication_function(channel_id,
                                                                       td_date_request_message_id,
                                                                       self.handle_TD_Date_Time_request)

    def _init_loader(self):
        """
        finds and creates widgets
        :return: none
        """
        self.lbDateTime             = self.find_widget(QtWidgets.QLabel             , 'lbDateTime'              )
        self.sbDateTimeReason       = self.find_widget(QtWidgets.QSpinBox           , 'DateTimeReasonSpinBox'   )

    def _init_connections(self):
        """
        initializes the widgets connections
        :return: none
        """
        pass


    def _init_widgets(self):
        """
        initializes the widgets' properties
        :return: none
        """
        self.sbDateTimeReason .setValue(0)

    @Slot()
    def handle_TD_Date_Time_request(self, message, timestamp = 0.0):
        """
        Called when the user requests to firmware from UI
        @return: None
        """
        reason      = self.sbDateTimeReason.value()
        self.td_interface.td_date_time_response(reason)

        if ( reason == 0 ):
            message = message['message']
            index = MsgFieldPositions.START_POS_FIELD_1
            dateTime,index = conversions.bytearray_to_integer( message, index)
            self.lbDateTime .setText( str(dateTime) )