"""
    The Vitals 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
from leahi_dialin.protocols       import CAN

# hd Simulator
from leahi_dialin.ui.td_messaging import TD_Messaging

class Loader(DynamicLoader):
    """
    The Vitals 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
            vitals_request_message_id = MsgIds.MSG_ID_UI_BLOOD_PRESSURE_REQUEST.value
            self.can_interface.register_receiving_publication_function(channel_id,
                                                                       vitals_request_message_id,
                                                                       self.handle_vitals_request)

    def _init_loader(self):
        """
        finds and creates widgets
        :return: none
        """
        self.tbSend             = self.find_widget(QtWidgets.QToolButton        , 'tbSend'                  )
        self.sbSystolic         = self.find_widget(QtWidgets.QSpinBox           , 'SystolicSpinBox'         )
        self.sbDiastolic        = self.find_widget(QtWidgets.QSpinBox           , 'DiastolicSpinBox'        )
        self.sbHeartRate        = self.find_widget(QtWidgets.QSpinBox           , 'HeartRateSpinBox'        )
        self.sbVitalsReason     = self.find_widget(QtWidgets.QSpinBox           , 'VitalsReasonSpinBox'     )

    def _init_connections(self):
        """
        initializes the widgets connections
        :return: none
        """
        self.tbSend         .clicked     .connect(self.do_send)
        self.sbSystolic     .valueChanged.connect(self.do_vitals_data)
        self.sbDiastolic    .valueChanged.connect(self.do_vitals_data)
        self.sbHeartRate    .valueChanged.connect(self.do_vitals_data)

    def _init_widgets(self):
        """
        initializes the widgets' properties
        :return: none
        """

        self.sbSystolic     .setValue(120)
        self.sbDiastolic    .setValue(80)
        self.sbHeartRate    .setValue(100)
        self.sbVitalsReason .setValue(0)

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

    @Slot()
    def do_vitals_data(self):
        """
        the slot for Vitals Data
        :return: none
        """
        systolic    = self.sbSystolic   .value()
        diastolic   = self.sbDiastolic  .value()
        heartRate   = self.sbHeartRate  .value()

        self.td_interface.td_vitals(
            systolic    ,
            diastolic   ,
            heartRate      
        )

    @Slot()
    def do_send(self):
        """
        the slot for treatment set point Data
        :return: none
        """
        self.do_vitals_data()