# User related models

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

# USER - DJANGO general imports
'''
from django.db import models
from django.core.validators import MaxValueValidator, MinValueValidator
from django.contrib.auth.models import AbstractUser, UserManager
from django.db.models.query import QuerySet
from django.db.models import Q, Max
'''

# (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 enum import Enum
#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.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




# Project imports
#from scientific_program.models import ScientificProgram, SP_Period, SP_Period_User  #, ScienceTheme


# ########### #
# USER MODELS #
# ########### #


class UserLevel(models.Model):
    name = models.CharField(max_length=45, blank=True, null=True)
    desc = models.TextField(blank=True, null=True)
    priority = models.IntegerField(blank=True, null=True)
    quota = models.FloatField(blank=True, null=True)

    class Meta:
        managed = True
        db_table = 'user_level'

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


class Country(models.Model):
    name = models.CharField(max_length=45, blank=True, null=True)
    desc = models.TextField(blank=True, null=True)
    quota = models.FloatField(blank=True, null=True)

    class Meta:
        managed = True
        db_table = 'country'
        verbose_name_plural = "Countries"

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

class Institute(models.Model):
    name = models.CharField(max_length=100, blank=False,
                            null=False, unique=True)
    quota = models.IntegerField(
        validators=[MinValueValidator(0), MaxValueValidator(100)])
    #representative_user = models.ForeignKey("PyrosUser", on_delete=models.DO_NOTHING,related_name="institutes",default=1)

    def __str__(self) -> str:
        return str(self.name)

    class Meta:
        db_table = "institute"

class ScienceTheme(models.Model):
    name = models.CharField(max_length=120, blank=False, null=False, default="", unique=True)
    def __str__(self) -> str:
        return str(self.name)
    class Meta:
        db_table = "science_theme"


class PyrosUserManager(UserManager):
    def tac_users(self):
        return PyrosUser.objects.filter(user_level__name="TAC")

    def unit_users(self):
        return PyrosUser.objects.filter(Q(user_level__name="Unit-PI") | Q(user_level__name="Unit-board"))


class PyrosUser(AbstractUser):
    username = models.CharField(
        max_length=255, blank=False, null=False, unique=True)
    is_active = models.BooleanField(default='False')
    first_time = models.BooleanField(default='False')
    country = models.ForeignKey(
        Country, on_delete=models.DO_NOTHING, related_name="pyros_users")
    user_level = models.ManyToManyField(UserLevel, related_name="pyros_users")
    desc = models.TextField(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)
    tel = models.CharField(max_length=45, blank=True, null=True)
    address = models.TextField(max_length=100, blank=True, null=True)
    laboratory = models.CharField(max_length=45, blank=True, null=True)
    institute = models.ForeignKey(
        Institute, on_delete=models.DO_NOTHING, related_name="pyros_users")
    is_institute_representative = models.BooleanField(default=False)
    motive_of_registration = models.TextField(
        max_length=300, blank=False, default="")
    # last_connect = models.DateTimeField(blank=True, null=True)
    # cur_connect = models.DateTimeField(blank=True, null=True)
    # putvalid_beg = models.DateTimeField(blank=True, null=True)
    # putvalid_end = models.DateTimeField(blank=True, null=True)
    # acqvalid_beg = models.CharField(max_length=45, blank=True, null=True)
    # acqvalid_end = models.CharField(max_length=45, blank=True, null=True)
    # quota = models.FloatField(blank=True, null=True)
    # quota_rea = models.FloatField(blank=True, null=True)
    # u_priority = models.IntegerField(blank=True, null=True)
    # p_priority = models.IntegerField(blank=True, null=True)
    # dir_level = models.IntegerField(blank=True, null=True)
    # can_del_void_req = models.BooleanField(default=False)
    validator = models.ForeignKey("PyrosUser", on_delete=models.DO_NOTHING, null=True, related_name="pyros_users")
    referee_themes = models.ManyToManyField(ScienceTheme, related_name="referee_themes", blank=True)
    #referee_themes = models.ManyToManyField('scientific_program.ScienceTheme', related_name="referee_themes", blank=True)
    #referee_themes = models.ManyToManyField('ScienceTheme', related_name="referee_themes", blank=True)

    objects = PyrosUserManager()

    class Meta:
        managed = True
        db_table = 'pyros_user'

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

    def user_username(self):
        return self.__str__()
    user_username.short_description = "Username"

    def get_priority(self) -> int:
        """
        return maximum priority of all roles of the user

        Returns:
            int: maximum priority
        """
        return PyrosUser.objects.get(id=self.id).user_level.all().aggregate(Max("priority"))["priority__max"]

    def get_roles_str(self) -> str:
        """
        return string that represent all roles assigned to the user

        Returns:
            str: string of all roles assigned to user
        """
        roles_str = ""
        # loop on all roles assigned to user
        for role in PyrosUser.objects.get(id=self.id).user_level.all():
            roles_str += role.name + ", "
        return roles_str[:-2]

    def get_list_of_roles(self) -> list:
        """
        return list of all roles assigned to the user

        Returns:
            list: list of all roles assigned to user
        """
        return PyrosUser.objects.get(id=self.id).user_level.all().values_list("name", flat=True)

    # Note for the next functions : We take the first result of the query because it should be only one result with the filter applied since each UserLevel has a unique priority.
    def get_max_priority_desc(self) -> str:
        """
        return the desc of the maximum priority of all roles assigned to user

        Returns:
            str:  desc of the maximum priority of all roles assigned to user
        """
        return PyrosUser.objects.get(id=self.id).user_level.filter(priority=self.get_priority())[0].desc

    def get_max_priority_quota(self) -> int:
        """
        return the quota of the maximum priority of all roles assigned to user

        Returns:
            int:  quota of the maximum priority of all roles assigned to user
        """
        return PyrosUser.objects.get(id=self.id).user_level.filter(priority=self.get_priority())[0].quota

    def get_referee_themes_as_str(self) -> str:
        """
        Return the list of science themes associated to that user if user is a TAC.
        Return empty string otherwise

        Returns:
            str: list of science themes associated to that user
        """
        str = ""
        if self.referee_themes != None:
            for science_theme in PyrosUser.objects.get(id=self.id).referee_themes.all():
                str += science_theme.name + ", "
            return str[:-2]
        else:
            return str

    def get_scientific_program(self) -> QuerySet:
        sp_where_user_is_sp_pi = ScientificProgram.objects.filter(
            sp_pi=self.id)
        other_sp_of_user = ScientificProgram.objects.filter(id__in=SP_Period.objects.filter(id__in=SP_Period_User.objects.filter(
            user=PyrosUser.objects.get(username=self.username)).values("SP_Period")).values_list("scientific_program", flat=True))
        sp_of_user = sp_where_user_is_sp_pi | other_sp_of_user
        return sp_of_user

    def get_scientific_program_where_user_is_sp_pi(self) -> QuerySet:
        sp_where_user_is_sp_pi = ScientificProgram.objects.filter(
            sp_pi=self.id)
        return sp_where_user_is_sp_pi






# ######################### #
# SCIENTIFIC PROGRAM MODELS #
# ######################### #

''' moved BEFORE PyrosUser which uses it
class ScienceTheme(models.Model):
    name = models.CharField(max_length=120, blank=False,
                            null=False, default="", unique=True)

    def __str__(self) -> str:
        return str(self.name)

    class Meta:
        db_table = "science_theme"
'''

class PeriodManager(models.Manager):
    # to get the currently active period, use exploitation_period()
    def currently_active_period(self) -> QuerySet:
        today = timezone.now().date()
        return Period.objects.get(start_date__lte=today, end_date__gt=today)

    def submission_periods(self) -> QuerySet:
        today = timezone.now().date()
        submission_periods_id = []
        periods = Period.objects.filter(start_date__gte=today)
        for period in periods:
            if period.submission_start_date <= today and period.submission_end_date > today:
                submission_periods_id.append(period.id)
        periods = periods.filter(id__in=submission_periods_id)
        return periods

    def evaluation_periods(self) -> QuerySet:
        today = timezone.now().date()
        evaluation_periods_id = []
        periods = Period.objects.filter(start_date__gte=today)
        for period in periods:
            if period.submission_end_date <= today and period.unit_pi_validation_start_date > today:
                evaluation_periods_id.append(period.id)
        periods = periods.filter(id__in=evaluation_periods_id)
        return periods

    def validation_periods(self) -> QuerySet:
        today = timezone.now().date()
        validation_periods_id = []
        periods = Period.objects.filter(start_date__gte=today)
        for period in periods:
            if period.unit_pi_validation_start_date <= today and period.notification_start_date > today:
                validation_periods_id.append(period.id)
        periods = periods.filter(id__in=validation_periods_id)
        return periods

    def notification_periods(self) -> QuerySet:
        today = timezone.now().date()
        notification_periods_id = []
        periods = Period.objects.filter(start_date__gte=today)
        for period in periods:
            if period.notification_start_date <= today and period.start_date > today:
                notification_periods_id.append(period.id)
        periods = periods.filter(id__in=notification_periods_id)
        return periods

    def exploitation_period(self) -> Any:
        today = timezone.now().date()
        periods = Period.objects.filter(start_date__lte=today)
        for period in periods:
            if period.start_date <= today and period.end_date > today:
                return period
        return None

    def latest_period(self) -> Any:
        today = timezone.now().date()
        future_period = Period.objects.filter(
            start_date__gt=today).order_by("-start_date").first()
        if future_period is None:
            # no future period defined so we return the current period
            if self.exploitation_period() != None:
                return self.exploitation_period()
            else:
                return self.previous_periods().first()
        return future_period

    def previous_periods(self) -> Any:
        today = timezone.now().date()
        previous_periods = Period.objects.filter(start_date__lt=today).order_by(
            "-start_date")
        if self.exploitation_period():
            previous_periods.exclude(id=self.exploitation_period().id)
        return previous_periods

    def next_period(self) -> Any:
        current_period = self.exploitation_period()
        next_period = Period.objects.filter(
            start_date__gt=current_period.start_date).order_by("start_date").first()
        return next_period


class Period(models.Model):
    # if change of default value, those values need to be changed also in create_period and edit_period.html (Javascript )
    today = timezone.now().date()
    today_plus_six_months = today + relativedelta(months=+6)
    today_minus_six_months = today + relativedelta(months=-6)
    today_minus_one_month_and_half = today + \
        relativedelta(months=-1) + relativedelta(days=-15)
    today_minus_fifteen_days = today + relativedelta(days=-15)
    end_date_plus_one_year = today_plus_six_months + relativedelta(years=+1)
    end_date_plus_eleven_year = today_plus_six_months + \
        relativedelta(years=+11)

    start_date = models.DateField(
        blank=True, null=True, default=timezone.now, editable=True)

    exploitation_duration = models.PositiveIntegerField(
        blank=True, null=True, default=182, editable=True)
    submission_duration = models.PositiveIntegerField(
        blank=True, null=True, default=136, editable=True)
    evaluation_duration = models.PositiveIntegerField(
        blank=True, null=True, default=31, editable=True)
    validation_duration = models.PositiveIntegerField(
        blank=True, null=True, default=5, editable=True)
    notification_duration = models.PositiveIntegerField(
        blank=True, null=True, default=10, editable=True)
    property_of_data_duration = models.PositiveIntegerField(
        blank=True, null=True, default=365, editable=True)
    data_accessibility_duration = models.PositiveIntegerField(
        blank=True, null=True, default=365*10, editable=True)

    @property
    def end_date(self):
        return self.start_date + relativedelta(days=self.exploitation_duration)

    @property
    def submission_start_date(self):
        return self.start_date + relativedelta(days=-(self.submission_duration+self.evaluation_duration+self.validation_duration+self.notification_duration))

    @property
    def submission_end_date(self):
        return self.submission_start_date + relativedelta(days=self.submission_duration)

    @property
    def unit_pi_validation_start_date(self):
        return self.submission_end_date + relativedelta(days=self.evaluation_duration)

    @property
    def notification_start_date(self):
        return self.unit_pi_validation_start_date + relativedelta(days=self.validation_duration)

    @property
    def property_of_data_end_date(self):
        return self.end_date + relativedelta(days=self.property_of_data_duration)

    @property
    def data_accessibility_end_date(self):
        return self.end_date + relativedelta(days=self.data_accessibility_duration)

    """
    end_date =  models.DateField(blank=True, null=True, default=start_date_plus_six_months,editable=True)    
    submission_start_date = models.DateField(blank=True, null=True, default=today_minus_six_months,editable=True)    
    submission_end_date = models.DateField(blank=True, null=True, default=today_minus_one_month_and_half,editable=True)    
    unit_pi_validation_start_date = models.DateField(blank=True, null=True, default=today_minus_fifteen_days,editable=True)    
    property_of_data_end_date = models.DateField(blank=True, null=True, default=end_date_plus_one_year,editable=True)     
    data_accessibility_end_date = models.DateField(blank=True, null=True, default=end_date_plus_eleven_year,editable=True)    
    
    #class Meta:
        # constrains start_date and duration to be unique (We don't want to have multiple records in db that represent the same period)
    #    constraints = [
    #        models.UniqueConstraint(fields=["start_date","duration"], name="unique_period")   
    #    ]
    """

    objects = PeriodManager()

    def __str__(self) -> str:
        return "P"+str(self.id)+" ("+self.start_date.strftime("%d/%m/%Y") + " to " + self.end_date.strftime("%d/%m/%Y")+")"

    def is_currently_active(self) -> bool:
        today = timezone.now().date()
        return self.start_date <= today < self.end_date

    def can_submit_sequence(self) -> bool:
        today = timezone.now().date()
        return today >= self.notification_start_date

    class Meta:
        db_table = "period"


class ScientificProgramManager(models.Manager):
    def observable_programs(self):
        exploitable_sp = []

        for sp_period in SP_Period.objects.all():
            if sp_period.can_submit_sequence():
                exploitable_sp.append(sp_period.scientific_program.id)
        return ScientificProgram.objects.filter(id__in=exploitable_sp)


class ScientificProgram(models.Model):

    created = models.DateTimeField(blank=True, null=True, auto_now_add=True)
    updated = models.DateTimeField(blank=True, null=True, auto_now=True)
    name = models.CharField(max_length=30, blank=False,
                            null=False, default="", unique=True)
    description_short = models.TextField(default="", max_length=320)
    description_long = models.TextField(default="")
    institute = models.ForeignKey('Institute', on_delete=models.DO_NOTHING, related_name="scientific_programs")
    sp_pi = models.ForeignKey('PyrosUser', on_delete=models.DO_NOTHING, related_name="Scientific_Program_Users")
    science_theme = models.ForeignKey(ScienceTheme, on_delete=models.DO_NOTHING, related_name="scientific_program_theme", default=1)
    is_auto_validated = models.BooleanField(default=False)
    objects = ScientificProgramManager()

    class Meta:
        managed = True
        db_table = 'scientific_program'

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


class SP_Period(models.Model):
    STATUSES_DRAFT = "Draft"
    STATUSES_SUBMITTED = "Submitted"
    STATUSES_EVALUATED = "Evaluated"
    STATUSES_ACCEPTED = "Accepted"
    STATUSES_REJECTED = "Rejected"
    STATUSES = [
        (STATUSES_DRAFT, "Draft"),
        (STATUSES_SUBMITTED, "Submitted"),
        (STATUSES_EVALUATED, "Evaluated"),
        (STATUSES_ACCEPTED, "Accepted"),
        (STATUSES_REJECTED, "Rejected")
    ]
    VOTES_YES = "A: Accepted"
    VOTES_NO = "C: Refused"
    VOTES_TO_DISCUSS = "B: To be discussed"
    VOTES = [
        (VOTES_YES, "A: Accepted"),
        (VOTES_TO_DISCUSS, "B: To be discussed"),
        (VOTES_NO, "C: Refused")
    ]
    IS_VALID_ACCEPTED = "Accepted"
    IS_VALID_REJECTED = "Rejected"
    IS_VALID = [
        (IS_VALID_ACCEPTED, "Accepted"),
        (IS_VALID_REJECTED, "Rejected")
    ]

    VISIBILITY_YES = "Yes"
    VISIBILITY_NO = "No"
    VISIBILITY_CHOICES = [
        (VISIBILITY_YES, "Yes"),
        (VISIBILITY_NO, "No"),
    ]
    period = models.ForeignKey(
        Period, on_delete=models.DO_NOTHING, related_name="SP_Periods")
    scientific_program = models.ForeignKey(
        ScientificProgram, on_delete=models.DO_NOTHING, related_name="SP_Periods")
    public_visibility = models.TextField(
        choices=VISIBILITY_CHOICES, default=VISIBILITY_YES)
    referee1 = models.ForeignKey('PyrosUser', on_delete=models.DO_NOTHING, related_name="TAC1_judgement", null=True)
    vote_referee1 = models.TextField(
        choices=VOTES, default=VOTES_YES, blank=True)
    reason_referee1 = models.TextField(blank=True)
    referee2 = models.ForeignKey('PyrosUser', on_delete=models.DO_NOTHING, related_name="TAC2_judgement", null=True)
    vote_referee2 = models.TextField(
        choices=VOTES, default=VOTES_YES, blank=True)
    reason_referee2 = models.TextField(blank=True)
    is_valid = models.TextField(
        choices=IS_VALID, default=IS_VALID_REJECTED, blank=True)
    status = models.TextField(choices=STATUSES, default=STATUSES_DRAFT)
    quota_minimal = models.PositiveIntegerField(default=0)
    quota_nominal = models.PositiveIntegerField(default=0)
    quota_allocated = models.PositiveIntegerField(default=0, blank=True)
    quota_remaining = models.PositiveIntegerField(default=0, blank=True)
    over_quota_duration = models.PositiveIntegerField(default=0)
    over_quota_duration_allocated = models.PositiveIntegerField(
        default=0, blank=True)
    over_quota_duration_remaining = models.PositiveIntegerField(default=0)
    token = models.PositiveIntegerField(default=0)
    token_allocated = models.PositiveIntegerField(default=0, blank=True)
    token_remaining = models.PositiveIntegerField(default=0, blank=True)
    priority = models.PositiveIntegerField(default=0, blank=True)

    def is_currently_active(self):
        return self.period.is_currently_active()

    def can_submit_sequence(self) -> bool:
        return self.is_currently_active() or self.period.can_submit_sequence() and self.status == self.STATUSES_ACCEPTED

    class Meta:
        db_table = "sp_period"

class SP_Period_User(models.Model):
    SP_Period = models.ForeignKey(SP_Period, on_delete=models.DO_NOTHING, related_name="SP_Period_Users")
    user = models.ForeignKey("PyrosUser", on_delete=models.CASCADE, related_name="SP_Period_Users")
    #is_SP_PI = models.BooleanField(default=False)

    class Meta:
        unique_together = ('SP_Period', 'user')
        db_table = "sp_period_user"


class SP_Period_Guest(models.Model):
    SP_Period = models.ForeignKey(
        SP_Period, on_delete=models.DO_NOTHING, related_name="SP_Period_Guests")
    email = models.EmailField(max_length=254)

    class Meta:
        db_table = "sp_period_guest"

class SP_PeriodWorkflow(models.Model):
    SUBMISSION = "SUB"
    EVALUATION = "EVAL"
    VALIDATION = "VALI"
    NOTIFICATION = "NOTI"
    ACTIONS_CHOICES = (
        (SUBMISSION, "Submission"),
        (EVALUATION, "Evaluation"),
        (VALIDATION, "Validation"),
        (NOTIFICATION, "Notification")
    )
    action = models.CharField(max_length=120, choices=ACTIONS_CHOICES)
    period = models.ForeignKey(
        "Period", on_delete=models.DO_NOTHING, related_name="SP_Period_Workflows")
    created = models.DateTimeField(blank=True, null=True, auto_now_add=True)

    class Meta:
        db_table = "sp_period_workflow"