##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("../../..")




"""
STYLE RULES
===========
https://simpleisbetterthancomplex.com/tips/2018/02/10/django-tip-22-designing-better-models.html
https://steelkiwi.com/blog/best-practices-working-django-models-python/

- Model name => singular
    Call it Company instead of Companies. 
    A model definition is the representation of a single object (the object in this example is a company), 
    and not a collection of companies
    The model definition is a class, so always use CapWords convention (no underscores)
    E.g. User, Permission, ContentType, etc.

- For the model’s attributes use snake_case.
    E.g. first_name, last_name, etc

- Blank and Null Fields (https://simpleisbetterthancomplex.com/tips/2016/07/25/django-tip-8-blank-or-null.html)
    - Null: It is database-related. Defines if a given database column will accept null values or not.
    - Blank: It is validation-related. It will be used during forms validation, when calling form.is_valid().
    Do not use null=True for text-based fields that are optional.
    Otherwise, you will end up having two possible values for “no data”, that is: None and an empty string.
    Having two possible values for “no data” is redundant.
    The Django convention is to use the empty string, not NULL.
    Example:
        # The default values of `null` and `blank` are `False`.
        class Person(models.Model):
            name = models.CharField(max_length=255)  # Mandatory
            bio = models.TextField(max_length=500, blank=True)  # Optional (don't put null=True)
            birth_date = models.DateField(null=True, blank=True) # Optional (here you may add null=True)
    The default values of null and blank are False.
    Special case, when you need to accept NULL values for a BooleanField, use NullBooleanField instead.

- Choices : you can use Choices from the model_utils library. Take model Article, for instance:
    from model_utils import Choices
    class Article(models.Model):
        STATUSES = Choices(
            (0, 'draft', _('draft')),
            (1, 'published', _('published'))   )
        status = models.IntegerField(choices=STATUSES, default=STATUSES.draft)

- Reverse Relationships

    - related_name :
    Rule of thumb: if you are not sure what would be the related_name, 
    use the plural of the model holding the ForeignKey.
    ex:
        class Company:
            name = models.CharField(max_length=30)
        class Employee:
            first_name = models.CharField(max_length=30)
            last_name = models.CharField(max_length=30)
            company = models.ForeignKey(Company, on_delete=models.CASCADE, related_name='employees')
    usage:
        google = Company.objects.get(name='Google')
        google.employees.all()
        You can also use the reverse relationship to modify the company field on the Employee instances:
        vitor = Employee.objects.get(first_name='Vitor')
        google = Company.objects.get(name='Google')
        google.employees.add(vitor)

    - related_query_name :
        This kind of relationship also applies to query filters. 
        For example, if I wanted to list all companies that employs people named ‘Vitor’, I could do the following:
        companies = Company.objects.filter(employee__first_name='Vitor')
        If you want to customize the name of this relationship, here is how we do it:
            class Employee:
                first_name = models.CharField(max_length=30)
                last_name = models.CharField(max_length=30)
                company = models.ForeignKey(
                    Company,
                    on_delete=models.CASCADE,
                    related_name='employees',
                    related_query_name='person'
                )
        Then the usage would be:
        companies = Company.objects.filter(person__first_name='Vitor')

    To use it consistently, related_name goes as plural and related_query_name goes as singular.


GENERAL EXAMPLE
=======

from django.db import models
from django.urls import reverse

class Company(models.Model):
    # CHOICES
    PUBLIC_LIMITED_COMPANY = 'PLC'
    PRIVATE_COMPANY_LIMITED = 'LTD'
    LIMITED_LIABILITY_PARTNERSHIP = 'LLP'
    COMPANY_TYPE_CHOICES = (
        (PUBLIC_LIMITED_COMPANY, 'Public limited company'),
        (PRIVATE_COMPANY_LIMITED, 'Private company limited by shares'),
        (LIMITED_LIABILITY_PARTNERSHIP, 'Limited liability partnership'),
    )

    # DATABASE FIELDS
    name = models.CharField('name', max_length=30)
    vat_identification_number = models.CharField('VAT', max_length=20)
    company_type = models.CharField('type', max_length=3, choices=COMPANY_TYPE_CHOICES)

    # MANAGERS
    objects = models.Manager()
    limited_companies = LimitedCompanyManager()

    # META CLASS
    class Meta:
        verbose_name = 'company'
        verbose_name_plural = 'companies'

    # TO STRING METHOD
    def __str__(self):
        return self.name

    # SAVE METHOD
    def save(self, *args, **kwargs):
        do_something()
        super().save(*args, **kwargs)  # Call the "real" save() method.
        do_something_else()

    # ABSOLUTE URL METHOD
    def get_absolute_url(self):
        return reverse('company_details', kwargs={'pk': self.id})

    # OTHER METHODS
    def process_invoices(self):
        do_something()

"""


# ---
# --- Utility functions
# ---

def printd(*args, **kwargs):
    if os.environ.get('PYROS_DEBUG', '0') == '1':
        print('(MODEL)', *args, **kwargs)

'''
def get_or_create_unique_row_from_model(model: models.Model):
    # return model.objects.get(id=1) if model.objects.exists() else model.objects.create(id=1)
    return model.objects.first() if model.objects.exists() else model.objects.create(id=1)
'''





"""
------------------------
   BASE MODEL CLASSES
------------------------
"""

"""
------------------------
   OTHER MODEL CLASSES
------------------------
"""


# TODO: OLD Config : à virer (mais utilisé dans dashboard/templatetags/tags.py)
class Config(models.Model):
    PYROS_STATE = ["Starting", "Passive", "Standby",
                   "Remote", "Startup", "Scheduler", "Closing"]

    id = models.IntegerField(default='1', primary_key=True)
    #latitude = models.FloatField(default=1)
    latitude = models.DecimalField(
        max_digits=4, decimal_places=2,
        default=1,
        validators=[
            MaxValueValidator(90),
            MinValueValidator(-90)
        ]
    )
    local_time_zone = models.FloatField(default=1)
    #longitude = models.FloatField(default=1)
    longitude = models.DecimalField(
        max_digits=5, decimal_places=2,
        default=1,
        validators=[
            MaxValueValidator(360),
            MinValueValidator(-360)
        ]
    )
    altitude = models.FloatField(default=1)
    horizon_line = models.FloatField(default=1)
    row_data_save_frequency = models.IntegerField(default='300')
    request_frequency = models.IntegerField(default='300')
    analysed_data_save = models.IntegerField(default='300')
    telescope_ip_address = models.CharField(max_length=45, default="127.0.0.1")
    camera_ip_address = models.CharField(max_length=45, default="127.0.0.1")
    plc_ip_address = models.CharField(max_length=45, default="127.0.0.1")

    # TODO: changer ça, c'est pas clair du tout...
    # True = mode Scheduler-standby, False = mode Remote !!!!
    global_mode = models.BooleanField(default='True')

    ack = models.BooleanField(default='False')
    bypass = models.BooleanField(default='True')
    lock = models.BooleanField(default='False')
    pyros_state = models.CharField(max_length=25, default=PYROS_STATE[0])
    force_passive_mode = models.BooleanField(default='False')
    plc_timeout_seconds = models.PositiveIntegerField(default=60)
    majordome_state = models.CharField(max_length=25, default="")
    ntc = models.BooleanField(default='False')
    majordome_restarted = models.BooleanField(default='False')

    class Meta:
        managed = True
        db_table = 'config'
        verbose_name_plural = "Config"

    def __str__(self):
        return (str(self.__dict__))



class Log(models.Model):
    agent = models.CharField(max_length=45, blank=True, null=True)
    created = models.DateTimeField(blank=True, null=True, auto_now_add=True)
    message = models.TextField(blank=True, null=True)

    class Meta:
        managed = True
        db_table = 'log'

    def __str__(self):
        return (str(self.agent))


# TODO: à virer car utilisé pour Celery (ou bien à utiliser pour les agents)
'''
class TaskId(models.Model):
    task = models.CharField(max_length=45, blank=True, null=True)
    created = models.DateTimeField(blank=True, null=True, auto_now_add=True)
    task_id = models.CharField(max_length=45, blank=True, null=True)

    class Meta:
        managed = True
        db_table = 'task_id'

    def __str__(self):
        return (str(self.task) + " - " + str(self.task_id))
'''


class Version(models.Model):
    module_name = models.CharField(max_length=45, blank=True, null=True)
    version = models.CharField(max_length=15, blank=True, null=True)
    created = models.DateTimeField(blank=True, null=True, auto_now_add=True)
    updated = models.DateTimeField(blank=True, null=True, auto_now=True)

    class Meta:
        managed = True
        db_table = 'version'

    def __str__(self):
        return (str(self.module_name) + " - " + str(self.version))

    
class Tickets(models.Model):
    created = models.DateTimeField(blank=True, null=True, auto_now_add=True)
    updated = models.DateTimeField(blank=True, null=True, auto_now=True)
    end =  models.DateTimeField(blank=True, null=True)
    title =  models.TextField(blank=True, null=True)
    description = models.TextField(blank=True, null=True)
    resolution = models.TextField(blank=True, null=True)
    pyros_user = models.ForeignKey(PyrosUser, on_delete=models.DO_NOTHING, related_name="tickets", blank=True, null=True)
    last_modified_by =  models.ForeignKey(PyrosUser, on_delete=models.DO_NOTHING, related_name="tickets_modified_by", blank=True, null=True)
    LEVEL_ONE = "ONE"
    LEVEL_TWO = "TWO"
    LEVEL_THREE = "THREE"
    LEVEL_FOUR = "FOUR"
    LEVEL_FIVE = "FIVE"
    SECURITY_LEVEL_CHOICES = (
        (LEVEL_ONE,"Warning non compromising for the operation of the system"),
        (LEVEL_TWO,"Known issue which can be solved by operating the software remotely"),
        (LEVEL_THREE,"Known issue which can be solved by an human remotely"),
        (LEVEL_FOUR,"Known issue without immediate solution"),
        (LEVEL_FIVE,"Issue not categorized until it happened")
    )
    security_level =  models.TextField(choices=SECURITY_LEVEL_CHOICES, default=LEVEL_ONE)

    class Meta:
        managed = True
        db_table = 'tickets'
        verbose_name_plural = "tickets"