###########################################################################
#
# 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    uv_reactors.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 NO_RESET, 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


@unique
class ReactorsNames(DialinEnum):
    INLET_UV_REACTOR = 0
    OUTLET_UV_REACTOR = 1


@unique
class ReactorsStates(DialinEnum):
    UV_REACTOR_STATE_OFF = 0
    UV_REACTOR_STATE_ON = 1


@unique
class ReactorsHealthStatus(DialinEnum):
    UV_REACTOR_NOT_HEALTHY = 0
    UV_REACTOR_HEALTHY = 1
    UV_REACTOR_OFF = 2


class UVReactors(AbstractSubSystem):
    """

    Dialysate Generator (DG) Dialin API sub-class for UV reactors 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

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

        self.inlet_uv_reactor_health = 0
        self.outlet_uv_reactor_health = 0
        self.inlet_uv_reactor_state = 0
        self.outlet_uv_reactor_state = 0

    def get_inlet_uv_reactor_health(self) -> int:
        """
        Gets the inlet UV reactor health

        @return: Inlet UV reactor health
        """
        return self.inlet_uv_reactor_health

    def get_outlet_uv_reactor_health(self) -> int:
        """
        Gets the outlet UV reactor health

        @return: Outlet UV reactor health
        """
        return self.outlet_uv_reactor_health

    def get_inlet_uv_reactor_state(self) -> int:
        """
        Gets the inlet UV reactor state

        @return: Inlet UV reactor state
        """
        return self.inlet_uv_reactor_state

    def get_outlet_uv_reactor_state(self) -> int:
        """
        Gets the outlet UV reactor state

        @return: Outlet UV reactor state
        """
        return self.outlet_uv_reactor_state

    @publish(['inlet_uv_reactor_health', 'outlet_uv_reactor_health', 'inlet_uv_reactor_state',
              'outlet_uv_reactor_state'])
    def _handler_uv_reactors_sync(self, message: dict) -> None:
        """
        Handles published thermistors message.

        @param message:  published thermistors message
        @return: none
        """
        inlet_health = struct.unpack('i', bytearray(
            message['message'][MsgFieldPositions.START_POS_FIELD_1:MsgFieldPositions.END_POS_FIELD_1]))[0]
        outlet_health = struct.unpack('i', bytearray(
            message['message'][MsgFieldPositions.START_POS_FIELD_2:MsgFieldPositions.END_POS_FIELD_2]))[0]
        inlet_state = struct.unpack('i', bytearray(
            message['message'][MsgFieldPositions.START_POS_FIELD_3:MsgFieldPositions.END_POS_FIELD_3]))[0]
        outlet_state = struct.unpack('i', bytearray(
            message['message'][MsgFieldPositions.START_POS_FIELD_4:MsgFieldPositions.END_POS_FIELD_4]))[0]

        self.inlet_uv_reactor_health = inlet_health
        self.outlet_uv_reactor_health = outlet_health

        # Check if the received state from firmware is in range otherwise, the state will be unknown
        self.inlet_uv_reactor_state = inlet_state
        self.outlet_uv_reactor_state = outlet_state

    def cmd_uv_reactors_data_broadcast_interval_override(self, ms: int, reset: int = NO_RESET) -> int:
        """
        Constructs and sends the UV reactors data publish interval.
        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

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

        self.logger.debug("Override UV reactors data publish 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(
                "UV reactors 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

    def cmd_uv_reactors_health_override(self, reactor: int, health: int, reset: int = NO_RESET) -> int:
        """
        Constructs and sends the UV reactors' health override command.
        Constraints:
            Must be logged into DG.

        @param reactor: (int) UV reactor index
        @param health: (int) 0 for unhealthy and 1 for healthy
        @param reset: (int) 0 for no reset and 1 for reset
        @return 1 if successful, zero otherwise
        """
        reset_value = integer_to_bytearray(reset)
        rctr = integer_to_bytearray(reactor)
        hlth = integer_to_bytearray(health)
        payload = reset_value + hlth + rctr

        message = DenaliMessage.build_message(channel_id=DenaliChannels.dialin_to_dg_ch_id,
                                              message_id=MsgIds.MSG_ID_DG_UV_REACTORS_HEALTH_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("UV reactors health override Timeout!!!")
            return False

    def cmd_start_stop_inlet_uv_reactor(self, state: int = ReactorsStates.UV_REACTOR_STATE_OFF.value) -> int:
        """
        Constructs and sends a start/stop command to the DG inlet UV reactor

        @param: state: (int) the state of the inlet UV reactor. 0 for Off (default) and 1 for On.
        @return: 1 if successful, zero otherwise
        """
        rst = integer_to_bytearray(0)
        inlet_uv_reactor_index = integer_to_bytearray(0)
        if state == ReactorsStates.UV_REACTOR_STATE_ON.value:
            payload = rst + integer_to_bytearray(1) + inlet_uv_reactor_index
            operation = 'Turning on '
        else:
            payload = rst + integer_to_bytearray(0) + inlet_uv_reactor_index
            operation = 'Turning off '

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

        # If there is content...
        if received_message is not None:
            self.logger.debug(operation + "inlet UV reactor")
            # response payload is OK or not OK
            return received_message['message'][DenaliMessage.PAYLOAD_START_INDEX]
        else:
            self.logger.debug(operation + "inlet UV reactor timeout!!")
            return False

    def cmd_start_stop_outlet_uv_reactor(self, state: int = ReactorsStates.UV_REACTOR_STATE_ON.value) -> int:
        """
        Constructs and sends a start/stop command to the DG outlet UV reactor

        @param: state: (int) the state of the outlet UV reactor. 0 for Off (default) and 1 for On.
        @return: 1 if successful, zero otherwise
        """
        rst = integer_to_bytearray(0)
        outlet_uv_reactor_index = integer_to_bytearray(1)
        if state == ReactorsStates.UV_REACTOR_STATE_ON.value:
            payload = rst + integer_to_bytearray(1) + outlet_uv_reactor_index
            operation = 'Turning on '
        else:
            payload = rst + integer_to_bytearray(0) + outlet_uv_reactor_index
            operation = 'Turning off '

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

        # If there is content...
        if received_message is not None:
            self.logger.debug(operation + "outlet UV reactor")
            # response payload is OK or not OK
            return received_message['message'][DenaliMessage.PAYLOAD_START_INDEX]
        else:
            self.logger.debug(operation + "outlet UV reactor timeout!!")
            return False