##from __future__ import unicode_literals

# (EP 21/9/22) To allow autoreferencing (ex: AgentCmd.create() returns a AgentCmd)
from __future__ import annotations

# Stdlib imports
from src.device_controller.abstract_component.device_controller import DeviceCmd
from datetime import datetime, timedelta, date
from dateutil.relativedelta import relativedelta
import os
import sys
from typing import Any, List, Tuple, Optional
import re

# Django imports
from django.core.validators import MaxValueValidator, MinValueValidator

# DJANGO imports
from django.contrib.auth.models import AbstractUser, UserManager
from django.db import models
from django.db.models import Q, Max
from django.core.validators import MaxValueValidator, MinValueValidator
#from django.db.models.deletion import DO_NOTHING
from django.db.models.expressions import F
from django.db.models.query import QuerySet
from model_utils import Choices
from django.utils import timezone
from asgiref.sync import async_to_sync
from channels.layers import get_channel_layer
from django.db.models.signals import post_save
from django.dispatch import receiver
# Project imports
from user_mgmt.models import PyrosUser
# DeviceCommand is used by class Command
sys.path.append("../../..")

# Create your models here.



class AgentLogs(models.Model):
    created = models.DateTimeField(blank=True, null=True, auto_now_add=True)
    name = models.CharField(max_length=50)
    message = models.TextField(blank=True, null=True)

    class Meta:
        managed = True
        db_table = 'agent_logs'

    def __str__(self):
        return (f"{self.created} {self.name} {self.message}")


class AgentSurvey(models.Model):
    """
    | id | name | created | updated | validity_duration (default=1mn) | mode (active/idle) | status (launch/init/loop/exit/...) |
    """

    # --- MODES ---
    '''
    In all modes, the Agent listens to commands sent to him and executes Agent level GENERAL ones.
    - MODE_IDLE : "idle" mode, does nothing, only executes Agent level GENERAL commands (DO_RESTART, DO_EXIT, DO_ABORT, DO_FLUSH, SET_ACTIVE, ...)
    - MODE_ROUTINE : idem IDLE + executes routine process (before & after)
    - MODE_ATTENTIVE : idem ROUTINE + executes Agent level SPECIFIC commands (commands specific to this agent, that only this agent understands and can execute)
    Default mode is MODE_ATTENTIVE (most active mode)
    '''
    MODE_CHOICES = Choices(
        "IDLE",  
        "ROUTINE",  
        "ATTENTIVE",
    )

    # --- STATUSES ---
    ''' Agent steps '''
    STATUS_CHOICES = Choices(
        'LAUNCHED',
        'INITIALIZING',
        'IN_MAIN_LOOP_START',
        'IN_MAIN_LOOP_ROUTINE_ITER_START',
        'IN_MAIN_LOOP_GET_NEXT_CMD',
        'IN_MAIN_LOOP_ROUTINE_ITER_END',
        'EXITING',      # STOP or HARD restart
        'RESTARTING',   # SOFT restart
    )

    name = models.CharField(max_length=50, unique=True)
    #name = models.CharField(max_length=50, blank=True, null=True, unique=True)
    #created = models.DateTimeField(blank=True, null=True, auto_now_add=True)
    created = models.DateTimeField(blank=True, null=True, auto_now_add=True)
    updated = models.DateTimeField(blank=True, null=True, auto_now=True)
    validity_duration = models.PositiveIntegerField(default=90)
    #validity_duration = models.DurationField(default=90)
    mode = models.CharField('agent mode', max_length=15,
                            blank=True, choices=MODE_CHOICES,
                            #default = MODE_CHOICES.ATTENTIVE
    )
    status = models.CharField(
        max_length=40, blank=True, choices=STATUS_CHOICES)
    iteration = models.IntegerField(blank=True, null=True)
    nb_restart_max = models.IntegerField(blank=True,null=True,default=3)
    current_nb_restart = models.IntegerField(blank=True,null=True,default=0)
    class Meta:
        managed = True
        db_table = 'agent_survey'
        #verbose_name = "agent survey"
        #verbose_name_plural = "agents survey"

    def __str__(self):
        return (f"Agent {self.name} at {self.updated} in mode {self.mode} and status {self.status}")

    # Testing agent status
    
    def is_launched(self): return self.status == self.STATUS_CHOICES.LAUNCHED
    def is_initializing(self): return self.status == self.STATUS_CHOICES.INITIALIZING
    
    def is_in_main_loop_start(self): return self.status == self.STATUS_CHOICES.IN_MAIN_LOOP
    def is_in_routine_bef(self): return self.status == self.STATUS_CHOICES.IN_ROUTINE_BEF
    def is_in_get_next_cmd(self): return self.status == self.STATUS_CHOICES.IN_GET_NEXT_CMD
    def is_in_routine_aft(self): return self.status == self.STATUS_CHOICES.IN_ROUTINE_AFT
    def is_in_main_loop(self): 
        return self.is_in_main_loop_start() or self.is_in_routine_bef() or self.is_in_get_next_cmd() or self.is_in_routine_aft()
    
    def is_stopping(self): return self.status == self.STATUS_CHOICES.EXITING
    def is_restarting(self): return self.status == self.STATUS_CHOICES.RESTARTING
    def is_stopping_or_restarting(self): return self.is_stopping() or self.is_restarting()




class AgentCmd(models.Model):
    """
    Command sent to an Agent

    Can be either :
    - an "agent level" (general or specific) command
    OR
    - a "device level" command

    | id | sender | recipient | name | validity_duration (default=60) | s_deposit_time | r_read_time

    See doc/models_Command_state_diag.pu for PlantUML state diagram
    """


    ###
    # =================================================================
    #    EXCEPTIONS classes
    # =================================================================
    ###

    class CmdException(Exception):
        ''' Base class for all Agent command exceptions '''
        # pass
        def __init__( self, cmd:Union[AgentCmd,str], msg:str=None):
            self.cmd = cmd
            self._msg = msg
            self.cmd_name = cmd if isinstance(cmd,str) else cmd.name
        @property
        def msg(self):
            msg = "EXCEPTION on command "+self.cmd_name
            return msg if not self._msg else msg+': '+self._msg
        # Default message if print exception
        def __str__(self):
            return self.msg
            '''
            msg = "EXCEPTION on command "+self.cmd_name
            return msg if not self.msg else msg+': '+self.msg
            '''
        '''
        def __str__(self):
            return f"The Agent command '{self.cmd.name}' is unknown to the agent"
            #return f"({type(self).__name__}): Device Generic command has no implementation in the controller"
        '''

    # --- CMD PENDING (non running) EXCEPTIONS ---

    # @Override
    class CmdExceptionUnknown(CmdException):
        ''' Raised when a PENDING (non running) Agent (specific) cmd is NOT known by the agent '''
        # @Override
        def __init__( self, cmd, msg:str=None):
            super().__init__(cmd, msg if msg else "Unknown command")
        #def __str__(self): return self.msg if self.msg else f"The Agent command '{self.cmd_name}' is unknown to the agent"

    # @Override
    class CmdExceptionUnimplemented(CmdException):
        ''' Raised when a PENDING (non running) Agent Specific cmd is known by the agent but not implemented '''
        # @Override
        def __init__( self, cmd, msg:str=None):
            super().__init__(cmd, msg if msg else "Command is known by the agent but not implemented")
        #def __str__(self): return f"The Agent command '{self.cmd_name}' is known by the agent but not implemented"

    # @Override
    class CmdExceptionBadArgs(CmdException):
        ''' Raised when a PENDING (non running) Agent cmd has bad, missing, or too many argument(s) '''
        # @Override
        def __init__( self, cmd, msg:str=None):
            super().__init__(cmd, msg if msg else "Command has bad, missing, or too many argument(s)")
        #def __str__(self): return f"The Agent command '{self.cmd_name}' has bad, missing, or too many argument(s)"


    # --- CMD RUNNING EXCEPTIONS ---

    # @Override
    class CmdExceptionExecError(CmdException):
        ''' Raised when a RUNNING Agent cmd has had a running error  '''
        # @Override
        def __init__( self, cmd, msg:str=None):
            super().__init__(cmd, msg if msg else "Error during Execution")
        #def __str__(self): return f"The running Agent command '{self.cmd_name}' has had an error (during execution)"

    # @Override
    class CmdExceptionExecTimeout(CmdException):
        ''' Raised when a RUNNING Agent cmd is timeout  '''
        # @Override
        def __init__( self, cmd, msg:str=None):
            super().__init__(cmd, msg if msg else "Execution is TIMEOUT")
        #def __str__(self): return f"The running Agent command '{self.cmd_name}' is timeout"

    # @Override
    class CmdExceptionExecKilled(CmdException):
        ''' Raised when a RUNNING Agent cmd has been aborted (by another agent)  '''
        # @Override
        def __init__( self, cmd, msg:str=None):
            super().__init__(cmd, msg if msg else "Command was KILLED during Execution (by another agent")
        #def __str__(self): return f"The running Agent command '{self.cmd_name}' has been killed (by another agent)"



    # -------------- Command CONSTANTS --------------

    # Command status codes
    CMD_STATUS_CODES = Choices(
        
        # Cmd is pending, waiting for execution
        "CMD_PENDING",  


        ### 1 - ERRORS BEFORE EVEN BEING RUN ###

        # Cmd is invalid (unknown or bad args)
        "CMD_INVALID",

        # Cmd is not yet implemented (by recipient agent)
        "CMD_UNIMPLEMENTED",

        # Cmd was skipped (not run, because the agent is IDLE (or in a mode which does not allow execution of this command)
        "CMD_SKIPPED",

        # Cmd is out of date (expired)
        # because it has been pending for too long
        #"CMD_OUTOFDATE",
        "CMD_EXPIRED",


        ### 2 - RUNNING ###
        # Cmd is running (after having been "read")
        "CMD_RUNNING",  


        ### 3 - ERRORS WHILE RUNNING ###

        # - Cmd was run and finished ok 
        # ( simulé par un sleep(3) dans AgentX.core_process() )
        "CMD_EXECUTED",

        # - Cmd was running, but then an error occured
        "CMD_EXEC_ERROR",  

        # - Cmd was running, but took too much time and timeout was reached
        "CMD_EXEC_TIMEOUT",  

        # - Cmd was aborted, killed by another agent
        #"CMD_KILLED",
        "CMD_EXEC_KILLED",

    )

    # Command default validity duration (from sending time) BEFORE execution, before being perempted (in sec)
    # => Each command validity can be set by SENDER when sending command, it will then be managed by RECIPIENT
    # => From the time a command was sent (cmd.s_deposit_time), it is still valid during DEFAULT_VALIDITY_DURATION sec.
    # => After that, it is considered as "expired" (obsolete) and must be marked as "CMD_OUTOFDATE" and not be executed anymore (and can be purged)
    # => Thus, a command is expired FROM time = s_deposit_time + VALIDITY_DURATION
    # (except if it is RUNNING, i.e. in state CMD_RUNNING)
    DEFAULT_VALIDITY_DURATION = 1 * 3600 # s

    # Command default execution timeout (in sec)
    # => Each command timeout is set by RECIPIENT (in AGENT_SPECIFIC_COMMANDS), and it will be managed by RECIPIENT
    # => Execution of a command MUST NOT last more than EXEC_TIMEOUT seconds (from execution start time cmd.r_start_time)
    # => Otherwise the (recipient) agent executing the command is responsible to abort it and mark it as "CMD_KILLED"
    DEFAULT_EXEC_TIMEOUT = 60 # s

    # -------------- Command FIELDS --------------

    #sender = models.CharField(max_length=50, blank=True, null=True, unique=True)
    # Sender and Recipient agents
    sender = models.CharField(max_length=50, help_text='sender agent name', null=False)
    recipient = models.CharField(max_length=50, help_text='recipient agent name', null=False)
    ##name = models.CharField(max_length=400, help_text='command name', null=False)
    full_name = models.CharField(max_length=400, help_text='command full name (with type and args)', null=False)
    
    validity_duration = models.PositiveIntegerField('(in sec)', default=DEFAULT_VALIDITY_DURATION)
    exec_timeout = models.PositiveIntegerField('(in sec)', default=DEFAULT_EXEC_TIMEOUT)
    
    #state = models.CharField(choices = CMD_STATUS_CODES, default=CMD_STATUS_CODES.CMD_PENDING, max_length=20)
    state = models.CharField(choices=CMD_STATUS_CODES, default=CMD_STATUS_CODES.CMD_PENDING, max_length=20)
    #state = models.IntegerField(choices=CMD_STATUS_CODES, default=RSCODE_PENDING)
    
    # TODO: maybe à mettre au format json (key:value)
    ##result = models.CharField(max_length=1000, blank=True)
    result = models.TextField(blank=True, null=False)

    # - on creation: (AUTO) Automatically set at table line creation (line created by the sender)
    s_deposit_time = models.DateTimeField(blank=True, null=True, auto_now_add=True)
    # - on reading:
    r_read_time = models.DateTimeField(null=True)
    # - on launching:
    r_start_time = models.DateTimeField(null=True)
    # - on end (after execution started or not)
    #end_time = models.DateTimeField(null=True)
    r_end_time = models.DateTimeField(null=True)

    # Other agent (than sender or recipient) that set this command to KILLED or EXPIRED
    killer_agent_name = models.CharField(max_length=50, help_text='sender agent name', null=True)

    # Intern field, not saved in DB
    _device_command = None

    class Meta:
        managed = True
        db_table = 'command'
        #verbose_name = "agent survey"
        #verbose_name_plural = "agents survey"

    _AGENT_GENERAL_COMMANDS = [
        
        # DO commands
        # -----------
        
        # - Evaluate the expression given (ex: do_eval 4+3)
        "do_eval",
                
        # GET commands
        # ------------

        # - Get agent current STATUS or STEP (IN_MAIN_LOOP, ...)
        "get_status",
        
        # - Get mode + status + iteration num
        "get_state",
        
        # - Get agent current MODE (idle, routine, attentive)
        "get_mode",
        
        # SET commands
        # -----------

        # - Set agent current STATE (IN_MAIN_LOOP, ...) => forbidden
        #"set_state",
        
        # - Set agent current MODE (idle, routine, attentive)
        ##"set_current_mode", # + value to set
        "set_mode", # + value to set

        
        # -----------
        # ### (PRIORITY) DO Commands => executed in priority (even if other pending commands exist) ###
        # -----------
        
        # - Finish your current command and then make a normal clean stop
        # ARGS (optional) :
        #   - "asap" (default) (wait for agent to finish its current processing, then exit)
        #   - "now" (abort agent current processing + exit)
        #   - "noprio" (not priority) (priority by default)
        "do_stop",
        # TODO: a virer => do_stop asap
        # @deprecated
        ##"do_exit",
        # TODO: a virer => do_stop now
        # @deprecated
        ##"do_abort",

        #FIXME: à implémenter
        # - 
        # ARGS :
        #   - "stop" : Temporaly stop execution of new commands (let them accumulate)
        #   - "resume" : Resume execution of commands (accumulated since "do_exec_commands stop")
        #   - "noprio" : not priority (by default => priority)        
        "do_exec_commands",

        # - Stop currently running command or/and routine
        # ARGS :
        #   - "cmd" : stop currently running specific command
        #   - "routine" : stop currently running routine process
        #   - "both" (default) : stop currently running current cmd and routine process
        "do_stop_current", # + arg "cmd" or "routine"
        # TODO: a virer => do_stop_current now
        # @deprecated
        ##"do_abort_current_command",
        
        # - Delete all your pending commands
        "do_flush_pending_commands", 
        # @deprecated
        ##"do_flush_commands", 
        
        # - Restart your global loop (starting with init())
        # ARGS (optional) :
        #   - "asap" (default) (wait for agent to finish its current processing, then restart loop)
        #   - "now" (abort agent current processing + restart loop)
        #   - "noprio" (not priority, priority by default)
        "do_restart", # + arg "asap" (default) or "now"

        "get_all_cmds",
        # @deprecated
        "get_specific_cmds",

    ]

    # Priority commands, executed as soon as in the received commands list (BEFORE any other pending command)
    # NB : must be a subset of _AGENT_GENERAL_COMMANDS
    _AGENT_GENERAL_PRIORITY_COMMANDS = [
        
        # 1 - NO STOP commands => will not stop the Agent or any running cmd
        "get_all_cmds",
        # @deprecated
        "get_specific_cmds",
        "do_flush_pending_commands", 
        "do_exec_commands"
        
        # 2 - PARTIAL STOP command => will just stop current running cmd (and routine)
        "do_stop_current",
        
        # 3 - (TOTAL) STOP commands => will stop the Agent (waiting or not for it to finish what it is doing)
        #"do_exit",
        "do_stop",
        "do_restart",
        # @deprecated
        ###"do_restart_loop",
    ]

    # -------------- Command CLASS (static) METHODS --------------

    @staticmethod
    def is_generic_name(cmd_name:str)->bool:
        '''
        Generic if starts with get_, set_, or do_
        '''
        return cmd_name.startswith( ('get_', 'set_', 'do_') )

    # Avoid to override the Model __init__ method
    # See https://docs.djangoproject.com/en/stable/ref/models/instances/#creating-objects
    @classmethod
    def create(cls, agent_from:str, agent_to:str, cmd_name:str, cmd_args:str=None, cmd_validity:int=None) -> AgentCmd :
        #print(agent_to)
        if '.' in agent_to:
            agent_to, component_name = agent_to.split('.')
            cmd_name = component_name+'.'+cmd_name
        # remove all excessive spaces
        print(cmd_args)
        if cmd_args:
            cmd_args = re.sub(r"\s+", " ", cmd_args).strip()
            cmd_name += ' ' + cmd_args
        # cls._device_command=DeviceCommand(cmd_name)
        if cmd_validity is None: cmd_validity = cls.DEFAULT_VALIDITY_DURATION
        #if cmd_timeout is None: cmd_timeout = cls.DEFAULT_EXEC_TIMEOUT
        return cls(
            sender=agent_from,
            recipient=agent_to,
            full_name=cmd_name,
            validity_duration=cmd_validity,
            #exec_timeout=cmd_timeout,
        )

    """
    @classmethod
    def send(cls, cmd:Command):
        cls.objects.create(sender=cmd.name, recipient=cmd.recipient, name=cmd.name)
    """

    @classmethod
    def send_cmd_from_to(cls, agent_from, agent_to, cmd_name, cmd_args=None, cmd_validity:int=None)->AgentCmd:
        """ Create and send a command, then return it """
        # def send(cls, from_agent, to_agent, cmd_name, cmd_args=None):
        """
        ex: send("AgentA",“AgentB”,"EVAL”,“3+4”)
        """
        '''
        if cmd_args: cmd_name += ' '+cmd_args
        #Command.objects.create(sender=self.name, recipient=r_agent, name=cmd_name)
        cmd = cls(sender=from_agent, recipient=to_agent, name=cmd_name)
        '''
        cmd = cls.create(agent_from, agent_to, cmd_name, cmd_args, cmd_validity)
        cmd.send()
        # cmd.set_as_pending()
        # cmd.save()
        return cmd

    @classmethod
    def max_deposit_date_for_peremption(cls):
        return datetime.now(tz=timezone.utc) - timedelta(seconds=cls.DEFAULT_VALIDITY_DURATION)
        #return datetime.utcnow().astimezone() - timedelta(seconds=cls.DEFAULT_VALIDITY_DURATION)
        #return datetime.utcnow().astimezone() - timedelta(hours=cls.DEFAULT_VALIDITY_DURATION)

    @classmethod
    #def delete_commands_with_running_status_for_agent(cls, agent_name):
    def kill_false_running_cmd_if_exists_for_agent(cls, agent_name):
        #FIXME: check that this command is not REALLY running (ex: cmd sent to device), and if so, kill it (or let it finish ?)
        print("Kill (false) 'running' command if exists:")
        running_commands = cls.objects.filter(
            # only commands for agent agent_name
            recipient=agent_name,
            # only running commands
            state=cls.CMD_STATUS_CODES.CMD_RUNNING,
            # only not expired commands
            #s_deposit_time__gte = cls.max_deposit_date_for_peremption(),
        )
        if running_commands:
            #AgentCmd.show_commands(running_commands)
            cls.show_commands(running_commands)
            #running_commands.delete()
            for cmd in running_commands:
                cmd.set_as_pending()
                cmd.set_as_skipped("Skip this cmd because false running cmd (at agent start)")
        else:
            print("<None>")

    @classmethod
    def delete_pending_commands_for_agent(cls, agent_name):
        """
        Delete all pending commands sent to agent_name,
        except very recent commands.
        This (exception) is to avoid a "data race" where for example agentB is executing a "flush" command 
        while agentA is sending command to agentB... :
        - agentB will then delete the command just sent by agentA
        - agentA will check regularly the status of its sent command, and this will crash as this command exists no more !!
        """
        print("Delete all pending command(s) if exists (except very recent ones, less than 2 sec ago):")
        #now_minus_2sec = datetime.utcnow().astimezone() - timedelta(seconds=2)
        now_minus_2sec = datetime.now(tz=timezone.utc) - timedelta(seconds=2)
        #print("now_minus_2sec", now_minus_2sec)
        pending_commands = cls.objects.filter(
            # only commands for agent agent_name
            recipient=agent_name,
            # only running commands
            state=cls.CMD_STATUS_CODES.CMD_PENDING,
            # except very recent commands : take only commands that are more than 2 sec old
            s_deposit_time__lt=now_minus_2sec
        )
        if pending_commands:
            AgentCmd.show_commands(pending_commands)
            pending_commands.delete()
        else:
            print("<None>")

    @classmethod
    def get_pending_commands_for_agent(cls, agent_name)->QuerySet:
        #print("peremption date", COMMAND_PEREMPTION_DATE_FROM_NOW)
        return cls.objects.filter(
            # only pending commands
            state=cls.CMD_STATUS_CODES.CMD_PENDING,
            # only commands for agent agent_name
            recipient=agent_name,
            # recipient__startswith=agent_name,
            # Q(recipient.split('.')[0] = agent_name),
            # only not expired commands
            #s_deposit_time__gte = cls.max_deposit_date_for_peremption(),
        ).order_by("s_deposit_time")

    @classmethod
    def get_pending_and_running_commands_for_agent(cls, agent_name)->QuerySet:
        #print("peremption date", COMMAND_PEREMPTION_DATE_FROM_NOW)
        return cls.objects.filter(
            # only pending or running commands
            Q(state=cls.CMD_STATUS_CODES.CMD_PENDING) | Q(state=cls.CMD_STATUS_CODES.CMD_RUNNING),
            # only commands for agent agent_name
            recipient=agent_name,
            # recipient__startswith=agent_name,
            # Q(recipient.split('.')[0] = agent_name),
            # only not expired commands
            #s_deposit_time__gte = cls.max_deposit_date_for_peremption(),
        ).order_by("s_deposit_time")

    @classmethod
    def get_commands_sent_to_agent(cls, agent_name):
        return cls.objects.filter(recipient=agent_name)

    @classmethod
    def get_commands_sent_by_agent(cls, agent_name):
        return cls.objects.filter(sender=agent_name)

    @classmethod
    def get_last_N_commands_sent_to_agent(cls, agent_name, N):
        # filter(since=since)
        # return cls.objects.all()[:nb_cmds]
        #commands = cls.objects.filter(recipient = agent_name).order_by('-id')[:N]
        commands = cls.get_commands_sent_to_agent(
            agent_name).order_by('-id')[:N]
        return list(reversed(commands))

    @classmethod
    def get_last_N_commands_sent_by_agent(cls, agent_name, N):
        # filter(since=since)
        # return cls.objects.all()[:nb_cmds]
        #commands = cls.objects.filter(recipient = agent_name).order_by('-id')[:N]
        commands = cls.get_commands_sent_by_agent(
            agent_name).order_by('-id')[:N]
        return list(reversed(commands))

    @classmethod
    def purge_old_commands_sent_to_agent(cls, agent_name):
        """
        Delete commands (which agent_name is recipient of) older than VALIDITY_DURATION (like 1h)
        ATTENTION !!! EXCEPT the RUNNING command !!!
        NB: datetime.utcnow() is equivalent to datetime.now(timezone.utc)
        """
        print(
            f"(Looking for commands sent to me that are not executing and perempted - i.e. older than {cls.DEFAULT_VALIDITY_DURATION/60} minute(s))")
        #COMMAND_PEREMPTION_DATE_FROM_NOW = datetime.utcnow() - timedelta(hours = cls.COMMANDS_PEREMPTION_HOURS)
        #print("peremption date", COMMAND_PEREMPTION_DATE_FROM_NOW)
        old_commands = cls.objects.filter(
            # only commands for agent agent_name
            recipient=agent_name,
            # only expired commands
            s_deposit_time__lt=cls.max_deposit_date_for_peremption(),
        ).exclude(
            state=cls.CMD_STATUS_CODES.CMD_RUNNING
        )
        if old_commands.exists():
            print("Found old commands to delete:")
            #for cmd in old_commands: print(cmd)
            cls.show_commands(old_commands)
            old_commands.delete()
        else:
            print("<None>")

    @staticmethod
    # def show_commands(cls, commands:models.query):
    def show_commands(commands, do_it: bool = False):
        # def show_commands(cls, commands:List[Commmand]):
        #if not commands.exists(): print("<No command>")
        commands = list(commands)
        if len(commands) == 0:
            print("<None>")
            #if do_it: print("<None>")
            #else: printd("<None>")
        for cmd in commands:
            print("-", cmd.name, cmd)
            #if do_it: print("-", cmd.name, cmd)
            #else: printd("-", cmd.name, cmd)

    # -------------- AgentCmd INSTANCE METHODS --------------

    def __str__(self):
        # return (f"Commmand '{self.name}' ({self.state}) sent by agent {self.sender} to agent {self.recipient} at {self.s_deposit_time}")
        cmd_sent_time = f" at {self.s_deposit_time}" if self.s_deposit_time else ''
        return (f"Commmand '{self.full_name}' ({self.state}) sent to agent {self.recipient}{cmd_sent_time} (validity={self.validity_duration}s,timeout={self.exec_timeout}s) [by agent {self.sender}]")

    @property
    def device_command(self) -> DeviceCmd :
        if not self._device_command:
            self._device_command = DeviceCmd(self.full_name)
            #dc = self._device_command
            #print("...DEVICE CMD:", dc.full_name, dc.name, dc.devtype, dc.args)
        return self._device_command

    @property
    #def name_and_args(self) -> Tuple[str, str] :
    def name_and_args(self) -> Tuple[str, List] :
        ###return self.device_command.name_and_args
        '''
        cmd_name_and_args = self.full_name
        if '.' in cmd_name_and_args:
            cmd_name_and_args = cmd_name_and_args.split('.')[1]
        return cmd_name_and_args
        '''
        ''' Return command name and args if exist '''
        # By default, no args
        #cmd_args = None
        cmd_args = []
        '''
        cmd_name = self.full_name
        if ' ' in cmd_name:
        '''
        cmd_name, *cmd_args = self.full_name.split(' ')
        return cmd_name, cmd_args


    #def get_full_name_parts(self) -> list :
    def get_full_name_parts(self) -> Tuple[str, str, str] :
        ''' Return command device type, name, and args from any command type (agent or device level) '''

        # No device type by default for an Agent command
        # cmd_type ?
        dev_type = None
        
        # By default, no args
        cmd_args = None

        cmd_name = self.full_name
        
        # Device command with device component type (dev_type)
        if '.' in cmd_name: 
            return self.device_command.get_full_name_parts()

        # Simple command with args (no dev_type)
        if ' ' in cmd_name:
            cmd_name, *cmd_args = self.name_and_args

        return dev_type, cmd_name, cmd_args


    @property
    def name(self):
        ###return self.device_command.name
        #_,cmd_name,_ = self.get_full_name_parts()
        cmd_name,_ = self.name_and_args
        return cmd_name

    @property
    def args(self):
        ###return self.device_command.args
        #_,_,cmd_args = self.get_full_name_parts()
        _,cmd_args = self.name_and_args
        return cmd_args

    @property
    def device_type(self): return self.device_command.devtype

    def send(self):
        # self.save()
        self.set_as_pending()

    '''
    def tokenize(self):
        cmd_name, *cmd_args = self.full_name.split(' ')
        return cmd_name, cmd_args
    '''

    # --- BOOLEAN (test) functions ---

    def is_generic(self)->bool:
        '''
        Generic if starts with get_, set_, or do_
        '''
        return self.is_generic_name(self.name)

    def is_agent_general_cmd(self)->bool:
        """
        Is this a general command ?
        It is the case if command is of style "do_set:state:idle" or "do_restart" or "do_flush"...
        """
        ##name = self.name
        ##if " " in name: name,args = name.split()
        ##name = self.name.split(' ')[0]
        ##cmd_name, _ = self.tokenize()
        # return cmd_name in self.GENERIC_COMMANDS
        #print("**********************CMD NAME is", self.name, "in ???", self._AGENT_GENERAL_COMMANDS)
        return self.name in self._AGENT_GENERAL_COMMANDS
        # "CMD_OUTOFDATE" # cde périmée

    def is_agent_general_priority_cmd_name(self)->bool:
        return self.name in self._AGENT_GENERAL_PRIORITY_COMMANDS

    def is_agent_general_priority_cmd(self)->bool:
        #return AgentCmd._is_agent_general_priority_cmd(self.name)
        #return self.__class__._is_agent_general_priority_cmd(self.name)
        #return type(self)._is_agent_general_priority_cmd(self.name)
        #return type(self)._is_agent_general_priority_cmd(self.full_name)
        return type(self)._is_agent_general_priority_cmd(self.name, self.args)

    @classmethod
    #def _is_agent_general_priority_cmd(cls, cmd_name_and_args=[])->bool:
    def _is_agent_general_priority_cmd(cls, cmd_name, cmd_args=[])->bool:
        #print(cmd_name_and_args)
        #cmd_name, cmd_args = re.sub(r"\s+", " ", cmd_name_and_args).strip().split(' ')
        #print(cmd_name, cmd_args)
        if cmd_name not in cls._AGENT_GENERAL_PRIORITY_COMMANDS: return False
        if cmd_args and cmd_args[0] == 'noprio': return False
        #return cmd_name in cls._AGENT_GENERAL_PRIORITY_COMMANDS and cmd_args and cmd_args[0] != 'noprio'
        return True


    def is_read(self)->bool:
        return self.r_read_time is not None

    #
    # CMD status management
    #

    def get_status(self):
        return self.state

    # 1 - pending
    def is_pending(self):
        return self.state == self.CMD_STATUS_CODES.CMD_PENDING

    # 2 - ERROR cases (from PENDING)
    def is_invalid(self): return self.state == self.CMD_STATUS_CODES.CMD_INVALID
    def is_unimplemented(self): return self.state == self.CMD_STATUS_CODES.CMD_UNIMPLEMENTED
    def is_skipped(self): return self.state == self.CMD_STATUS_CODES.CMD_SKIPPED
    def is_expired(self):
        if self.state == self.CMD_STATUS_CODES.CMD_EXPIRED: return True
        # Must NOT be running
        if self.is_running(): return False
        # return (datetime.utcnow() - self.s_deposit_time) > timedelta(seconds = self.validity_duration)
        #elapsed_time = (datetime.utcnow().astimezone() - self.s_deposit_time)
        elapsed_time = ( datetime.now(tz=timezone.utc) - self.s_deposit_time )
        print("elapsed_time", elapsed_time)
        return elapsed_time > timedelta(seconds=self.validity_duration)
        """
        elapsed_time = cmd.r_read_time - cmd.s_deposit_time
        max_time = timedelta(seconds = cmd.validity_duration)
        print(f"Elapsed time is {elapsed_time}, (max is {max_time})")
        if elapsed_time > max_time:
        """
    # finished with issue (from pending)
    def is_pending_issue(self): return self.is_invalid() or self.is_unimplemented() or self.is_skipped() or self.is_expired()

    # 3 - running
    def is_running(self):
        return self.state == self.CMD_STATUS_CODES.CMD_RUNNING

    # 4 - ERROR cases (from RUNNING)
    def is_exec_error(self): return self.state == self.CMD_STATUS_CODES.CMD_EXEC_ERROR
    def is_exec_killed(self): return self.state == self.CMD_STATUS_CODES.CMD_EXEC_KILLED
    # alias
    def is_killed(self): return self.is_exec_killed()
    # alias
    def is_timeout(self): return self.is_exec_timeout()
    def is_exec_timeout(self):
        if self.state == self.CMD_STATUS_CODES.CMD_EXEC_TIMEOUT: return True
        # Must be running
        if not self.is_running(): return False
        # return (datetime.utcnow() - self.s_deposit_time) > timedelta(seconds = self.validity_duration)
        #elapsed_time = (datetime.utcnow().astimezone() - self.r_start_time)
        elapsed_time = (datetime.now(tz=timezone.utc) - self.r_start_time)
        print("elapsed_time since exec", elapsed_time)
        return elapsed_time > timedelta(seconds=self.exec_timeout)
    # finished with any execution issue
    def is_exec_issue(self): return self.state.startswith("CMD_EXEC_")

    # 5 - Execution finished
    # Cmd is finished if not pending or running
    def is_finished(self):
        return not (self.is_pending() or self.is_running())
    # Cmd is finished with error : finished but NOT executed (= ALL except : CMD_PENDING, CMD_RUNNING, or CMD_EXECUTED)
    def is_finished_with_error(self):
        return self.is_finished() and not self.is_executed()
    # Cmd is finished without error (normal case)
    def is_executed(self):
        return self.state == self.CMD_STATUS_CODES.CMD_EXECUTED



    # --- GETTERS/SETTERS functions ---

    def get_result(self):
        return self.result

    def get_updated_result(self):
        self.refresh_from_db()
        return self.result

    def set_result(self, result: str, do_save:bool=True):
        self.result = result
        if do_save: self.save()

    def set_read_time(self, do_save:bool=True):
        #self.r_read_time = datetime.utcnow().astimezone()
        self.r_read_time = datetime.now(tz=timezone.utc)
        # Optimization: update only 1 field
        if do_save: self.save(update_fields=["r_read_time"])

    #
    # Set cmd status
    #

    # - From None
    def set_as_pending(self):
        self.set_state_to(self.CMD_STATUS_CODES.CMD_PENDING)

    # - from PENDING
    def set_as_unimplemented(self, result:str=None):
        #assert self.is_pending(), "An Unimplemented Command must have been PENDING"
        self.set_state_to(self.CMD_STATUS_CODES.CMD_UNIMPLEMENTED, result=result)
    def set_as_invalid(self, result:str=None):
        #assert self.is_pending()
        self.set_state_to(self.CMD_STATUS_CODES.CMD_INVALID, result=result)
    def set_as_skipped(self, result:str=None):
        #assert self.is_pending()
        self.set_state_to(self.CMD_STATUS_CODES.CMD_SKIPPED, result=result)
    def set_as_expired(self):
        #assert self.is_pending()
        #print(f"- Set this command as expired (older than its validity duration of {self.validity_duration}s): {self}")
        self.set_state_to(self.CMD_STATUS_CODES.CMD_EXPIRED)
    def set_as_running(self):
        #FIXMD: log.info() au lieu de print()
        print('-'*6 + " STARTING COMMAND EXEC")
        #assert self.is_pending()
        print(f"- Set command {self.name} as running")
        self.set_state_to(self.CMD_STATUS_CODES.CMD_RUNNING)

    '''
    def set_as_executed(self):
        self.set_state_to(self.CMD_STATUS_CODES.CMD_EXECUTED)
    '''
    # - from RUNNING
    def set_as_processed(self, result:str=None):
       # assert self.is_running(), "a PROCESSED command must have been RUNNING"
        print(f"- Set command {self.name} as processed")
        self.set_state_to(self.CMD_STATUS_CODES.CMD_EXECUTED, result=result)
        # print(self)
        """
        self.state = self.CMD_STATUS_CODES.CMD_EXECUTED
        self.r_processed_time = datetime.utcnow().astimezone()
        self.save()
        """
        # Optimization: update the related fields, but does not work, why ?
        ##self.save(update_fields=["state", "r_processed_time"])
    #def set_as_outofdate(self):
    def set_as_exec_error(self, result:str=None):
        assert self.is_running()
        self.set_state_to(self.CMD_STATUS_CODES.CMD_EXEC_ERROR, result=result)
    def set_as_exec_timeout(self, result:str=None):
        assert self.is_running()
        self.set_state_to(self.CMD_STATUS_CODES.CMD_EXEC_TIMEOUT, result=result)
    def set_as_exec_timeout(self, result:str=None):
        assert self.is_running()
        self.set_state_to(self.CMD_STATUS_CODES.CMD_EXEC_TIMEOUT, result=result)
    def set_as_killed_by(self, author_agent_name:str, result:str=None):
        #assert self.is_running()
        print(f"- Set command {self.name} as killed")
        #print(f"- Set this command as killed: {self}")
        self.set_state_to(self.CMD_STATUS_CODES.CMD_EXEC_KILLED, author_agent_name=author_agent_name, result=result)

    # General method to change state
    def set_state_to(self, status_new: str, author_agent_name: str = None, result:str=None):
        '''
        If result is present it will be set in the "result" field
        '''
        #now_time = datetime.utcnow().astimezone()
        now_time = datetime.now(tz=timezone.utc)
        
        # result can be "0" which is false...
        if result is not None: 
            self.set_result(result, False)
        
        '''
        # - Changing state to PENDING (from None)
        if status_new == self.CMD_STATUS_CODES.CMD_PENDING:
            self.s_deposit_time = now_time
        '''

        # - Changing state from PENDING
        #if status_new in (self.CMD_STATUS_CODES.CMD_RUNNING, self.CMD_STATUS_CODES.CMD_SKIPPED, self.CMD_STATUS_CODES.CMD_EXPIRED):
        if status_new in (
            # Errors cases
            self.CMD_STATUS_CODES.CMD_INVALID,
            self.CMD_STATUS_CODES.CMD_UNIMPLEMENTED,
            self.CMD_STATUS_CODES.CMD_SKIPPED, 
            self.CMD_STATUS_CODES.CMD_EXPIRED,
            # Normal case
            self.CMD_STATUS_CODES.CMD_RUNNING
        ):
            assert self.is_pending()
            # - go RUNNING => set start time
            if status_new == self.CMD_STATUS_CODES.CMD_RUNNING:
                self.r_start_time = now_time
            # - go in error => set end time
            else:
                self.r_end_time = now_time
                # EXPIRED
                if status_new == self.CMD_STATUS_CODES.CMD_EXPIRED:
                    self.killer_agent_name = author_agent_name
        
        # - Changing state from RUNNING (CMD_EXECUTED, CMD_EXEC_...)
        #elif status_new in (self.CMD_STATUS_CODES.CMD_EXECUTED, self.CMD_STATUS_CODES.CMD_EXEC_KILLED):
        elif status_new != self.CMD_STATUS_CODES.CMD_PENDING:
            assert self.is_running()
            self.r_end_time = now_time
            if status_new == self.CMD_STATUS_CODES.CMD_EXEC_KILLED:
                self.killer_agent_name = author_agent_name
        # Update command status
        self.state = status_new
        self.save()
        # Optimization, but does not work, why ?...
        # self.save(update_fields=["state"])

    # override save to use websocket
    # def save(self, *args, **kwargs):
    #     super().save(*args, **kwargs)
    #     try:
    #         if self.pk == None:
    #             action = "create"
    #         else:
    #             action = "update"
    #         agent_survey = AgentSurvey.objects.all().values_list("name",flat=True)
    #         # initialize value, there is always a sender
    #         agent_name = self.sender
    #         if self.sender in agent_survey:
    #             agent_name = self.sender 
    #             # send to agentcmd_observers group a message to execute function new_agentcmd_agent_name_instance
    #         if self.recipient in agent_survey:
    #             agent_name = self.recipient
    #         # send to agentcmd_observers group a message to execute function new_agentcmd_agent_name_instance
    #         async_to_sync(get_channel_layer().group_send)(
    #             f'agentcmd_{agent_name}_observers', {"type": f"send_agentcmd_instance","data":self.id,"action":action}
    #         )
    #     except Exception as e:
    #         print(e)

# signals decorator to trigger function after Model AgentCmd call save()
@receiver(post_save, sender=AgentCmd)
def send_agentcmd_to_websocket(sender, instance, created, **kwargs):
    agent_survey = AgentSurvey.objects.all().values_list("name",flat=True)
    if instance.sender in agent_survey:
        agent_name = instance.sender
        # send to agentcmd_observers group a message to execute function new_agentcmd_agent_name_instance
        async_to_sync(get_channel_layer().group_send)(
            f'agentcmd_{agent_name}_observers', {"type": f"send_agentcmd_instance","action":"list"}
        )
    elif instance.recipient in agent_survey:
        agent_name = instance.recipient
        # send to agentcmd_observers group a message to execute function new_agentcmd_agent_name_instance
        async_to_sync(get_channel_layer().group_send)(
            f'agentcmd_{agent_name}_observers', {"type": f"send_agentcmd_instance","action":"list"}
        )
    # if created:
    #     action = "create"
    # else:
    #     action = "update"
    # agent_survey = AgentSurvey.objects.all().values_list("name",flat=True)
    # # initialize value, there is always a sender
    # agent_name = instance.sender
    # if instance.sender in agent_survey:
    #     agent_name = selinstancef.sender 
    #     # send to agentcmd_observers group a message to execute function new_agentcmd_agent_name_instance
    # if instance.recipient in agent_survey:
    #     agent_name = instance.recipient
    # # send to agentcmd_observers group a message to execute function new_agentcmd_agent_name_instance
    # async_to_sync(get_channel_layer().group_send)(
    #     f'agentcmd_{agent_name}_observers', {"type": f"send_agentcmd_instance","data":instance.id,"action":action}
    # )


@receiver(post_save, sender=AgentSurvey)
def send_agentsurvey_to_websocket(sender, instance, created, **kwargs):
    agent_name = instance.name
    # send to agentsurvey_observers group a message to execute function new_agentcmd_agent_name_instance
    async_to_sync(get_channel_layer().group_send)(
            f'agentsurvey_{agent_name}_observers', {"type": f"send_agentsurvey_instance"}
    )
    async_to_sync(get_channel_layer().group_send)(
            f'agentsurvey_observers', {"type": f"send_agentsurvey_instance"}
    )



class Majordome(models.Model):
    created = models.DateTimeField(blank=True, null=True, auto_now_add=True)
    updated = models.DateTimeField(blank=True, null=True, auto_now=True)
    # Software Modes
    AUTO_MODE = "AUTO"
    MANUAL_MODE = "MANUAL"
    SOFT_MODE_CHOICES = (
        (AUTO_MODE, 'Auto mode'),
        (MANUAL_MODE, 'Manual mode'),
    )
    DAY_MODE = "DAY"
    NIGHT_MODE = "NIGHT"
    OBS_MODE_CHOICES = (
        (DAY_MODE, "Day mode"),
        (NIGHT_MODE, "Night mode")
    )
    soft_mode = models.CharField(
        choices=SOFT_MODE_CHOICES,
        default=MANUAL_MODE,
        max_length=15
    )
    
    obs_mode = models.CharField(
        choices = OBS_MODE_CHOICES,
        default = DAY_MODE,
        max_length=15
    )
    class Meta:
        managed = True
        db_table = 'majordome'

    @classmethod
    def object(cls):
        return cls._default_manager.first() 

    def save(self, *args, **kwargs):
        self.pk = self.id = 1
        return super().save(*args, **kwargs)