###########################################################################
#
# Copyright (c) 2019-2021 Diality Inc. - All Rights Reserved.
#
# THIS CODE MAY NOT BE COPIED OR REPRODUCED IN ANY FORM, IN PART OR IN
# WHOLE, WITHOUT THE EXPLICIT PERMISSION OF THE COPYRIGHT OWNER.
#
# @file    thermistors.py
#
# @author  (last)      Quang Nguyen
# @date    (last)      05-Aug-2021
# @author  (original)  Dara Navaei
# @date    (original)  18-Nov-2020
#
############################################################################
import struct
from enum import unique
from logging import Logger

from .constants import RESET, NO_RESET
from ..common.msg_defs import MsgIds, MsgFieldPositions
from ..protocols.CAN import DenaliMessage, DenaliChannels
from ..utils.base import AbstractSubSystem, publish, DialinEnum
from ..utils.checks import check_broadcast_interval_override_ms
from ..utils.conversions import integer_to_bytearray, float_to_bytearray


@unique
class ThermistorsNames(DialinEnum):
    THERMISTOR_ONBOARD_NTC = 0
    THERMISTOR_POWER_SUPPLY_1 = 1
    THERMISTOR_POWER_SUPPLY_2 = 2


class Thermistors(AbstractSubSystem):
    """
    Dialysate Generation (DG) interface for thermistors and board temperature sensors related commands.
    """

    def __init__(self, can_interface, logger: Logger):
        """

        @param can_interface: Denali CAN Messenger object
        """

        super().__init__()

        self.can_interface = can_interface
        self.logger = logger
        # Dictionary of the thermistors
        self.thermistors = {ThermistorsNames.THERMISTOR_ONBOARD_NTC.name: {},
                            ThermistorsNames.THERMISTOR_POWER_SUPPLY_1.name: {},
                            ThermistorsNames.THERMISTOR_POWER_SUPPLY_2.name: {}}

        if self.can_interface is not None:
            channel_id = DenaliChannels.dg_sync_broadcast_ch_id
            msg_id = MsgIds.MSG_ID_DG_THERMISTORS_DATA.value
            self.can_interface.register_receiving_publication_function(channel_id, msg_id,
                                                                       self._handler_thermistors_sync)

    def get_temperature(self, thermistor):
        """
        Gets a thermistor's value

        @param: thermistor: (int) thermistor index
        @return: The temperature of a thermistor
        """
        return self.thermistors[ThermistorsNames(thermistor).name]

    @publish(['thermistors'])
    def _handler_thermistors_sync(self, message):
        """
        Handles published thermistors message.

        @param message:  published thermistors message
        @return: none
        """
        onboard_temp = struct.unpack('f', bytearray(
            message['message'][MsgFieldPositions.START_POS_FIELD_1:MsgFieldPositions.END_POS_FIELD_1]))[0]
        pwr_supply_1 = struct.unpack('f', bytearray(
            message['message'][MsgFieldPositions.START_POS_FIELD_2:MsgFieldPositions.END_POS_FIELD_2]))[0]
        pwr_supply_2 = struct.unpack('f', bytearray(
            message['message'][MsgFieldPositions.START_POS_FIELD_3:MsgFieldPositions.END_POS_FIELD_3]))[0]

        self.thermistors[ThermistorsNames.THERMISTOR_ONBOARD_NTC.name] = onboard_temp
        self.thermistors[ThermistorsNames.THERMISTOR_POWER_SUPPLY_1.name] = pwr_supply_1
        self.thermistors[ThermistorsNames.THERMISTOR_POWER_SUPPLY_2.name] = pwr_supply_2

    def cmd_thermistors_value_override(self, thermistor: int, value: float, reset: int = NO_RESET) -> int:
        """
        Constructs and sends the thermistors value override command
        Constraints:
            Must be logged into DG.

        @param value: float the temperature to be set
        @param thermistor: (int) thermistor index
        @param reset: (int) 1 to reset a previous override, 0 to override
        @return 1 if successful, zero otherwise
        """
        reset_value = integer_to_bytearray(reset)
        vlu = float_to_bytearray(value)
        thr = integer_to_bytearray(thermistor)
        payload = reset_value + vlu + thr

        message = DenaliMessage.build_message(channel_id=DenaliChannels.dialin_to_dg_ch_id,
                                              message_id=MsgIds.MSG_ID_DG_THERMISTORS_VALUE_OVERRIDE.value,
                                              payload=payload)
        # Send message
        received_message = self.can_interface.send(message)

        # If there is content...
        if received_message is not None:
            # response payload is OK or not OK
            return received_message['message'][DenaliMessage.PAYLOAD_START_INDEX]
        else:
            self.logger.debug("Themristors value override Timeout!!!")
            return False

    def cmd_thermistors_data_broadcast_interval_override(self, ms: int, reset: int = NO_RESET) -> int:
        """
        Constructs and sends the thermistors data publish interval command.
        Constraints:
            Must be logged into DG.
            Given interval must be non-zero and a multiple of the DG general task interval (50 ms).

        @param ms: (int) interval (in ms) to override with
        @param reset: (int) 1 to reset a previous override, 0 to override
        @return: 1 if successful, zero otherwise
        """
        if not check_broadcast_interval_override_ms(ms):
            return False

        rst = integer_to_bytearray(reset)
        mis = integer_to_bytearray(ms)
        payload = rst + mis

        msg_id = MsgIds.MSG_ID_DG_THERMISTORS_DATA_PUBLISH_INTERVAL_OVERRIDE.value
        message = DenaliMessage.build_message(channel_id=DenaliChannels.dialin_to_dg_ch_id, message_id=msg_id,
                                              payload=payload)

        self.logger.debug("Overriding themistors broadcast interval")

        # Send message
        received_message = self.can_interface.send(message)

        # If there is content...
        if received_message is not None:
            # self.logger.debug(received_message)
            if reset == RESET:
                str_res = "reset back to normal"
            else:
                str_res = str(mis)
            self.logger.debug(
                "Thermistors data broadcast interval overridden to " + str_res + " ms: " +
                str(received_message['message'][DenaliMessage.PAYLOAD_START_INDEX]))
            # response payload is OK or not OK
            return received_message['message'][DenaliMessage.PAYLOAD_START_INDEX]
        else:
            self.logger.debug("Timeout!!!!")
            return False