"""
models.py

This module is used to register django models
"""

import ipaddress
from datetime import date, datetime, timedelta
from typing import Iterable

import django
from django.apps import apps
from django.contrib import messages
from django.contrib.auth.models import AbstractUser, User
from django.core.exceptions import ValidationError
from django.db import models
from django.db.models.signals import post_save
from django.dispatch import receiver
from django.utils.translation import gettext_lazy as _

from base.horilla_company_manager import HorillaCompanyManager
from horilla import horilla_middlewares
from horilla.horilla_middlewares import _thread_locals
from horilla.methods import get_horilla_model_class
from horilla.models import HorillaModel
from horilla_audit.models import HorillaAuditInfo, HorillaAuditLog

# Create your models here.
WEEKS = [
    ("0", _("First Week")),
    ("1", _("Second Week")),
    ("2", _("Third Week")),
    ("3", _("Fourth Week")),
    ("4", _("Fifth Week")),
]


WEEK_DAYS = [
    ("0", _("Monday")),
    ("1", _("Tuesday")),
    ("2", _("Wednesday")),
    ("3", _("Thursday")),
    ("4", _("Friday")),
    ("5", _("Saturday")),
    ("6", _("Sunday")),
]


def validate_time_format(value):
    """
    this method is used to validate the format of duration like fields.
    """
    if len(value) > 6:
        raise ValidationError(_("Invalid format, it should be HH:MM format"))
    try:
        hour, minute = value.split(":")
        hour = int(hour)
        minute = int(minute)
        if len(str(hour)) > 3 or minute not in range(60):
            raise ValidationError(_("Invalid time, excepted HH:MM"))
    except ValueError as e:
        raise ValidationError(_("Invalid format,  excepted HH:MM")) from e


def clear_messages(request):
    storage = messages.get_messages(request)
    for message in storage:
        pass


class Company(HorillaModel):
    """
    Company model
    """

    company = models.CharField(max_length=50)
    hq = models.BooleanField(default=False)
    address = models.TextField(max_length=255)
    country = models.CharField(max_length=50)
    state = models.CharField(max_length=50)
    city = models.CharField(max_length=50)
    zip = models.CharField(max_length=20)
    icon = models.FileField(
        upload_to="base/icon",
        null=True,
    )
    objects = models.Manager()
    date_format = models.CharField(max_length=30, blank=True, null=True)
    time_format = models.CharField(max_length=20, blank=True, null=True)

    class Meta:
        """
        Meta class to add additional options
        """

        verbose_name = _("Company")
        verbose_name_plural = _("Companies")
        unique_together = ["company", "address"]
        app_label = "base"

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


class Department(HorillaModel):
    """
    Department model
    """

    department = models.CharField(max_length=50, blank=False)
    company_id = models.ManyToManyField(Company, blank=True, verbose_name=_("Company"))

    objects = HorillaCompanyManager()

    class Meta:
        verbose_name = _("Department")
        verbose_name_plural = _("Departments")

    def clean(self, *args, **kwargs):
        super().clean(*args, **kwargs)
        request = getattr(_thread_locals, "request", None)
        if request and request.POST:
            company = request.POST.getlist("company_id", None)
            department = request.POST.get("department", None)
            if (
                Department.objects.filter(
                    company_id__id__in=company, department=department
                )
                .exclude(id=self.id)
                .exists()
            ):
                raise ValidationError("This department already exists in this company")
        return

    def save(self, *args, **kwargs):
        super().save(*args, **kwargs)
        self.clean(*args, **kwargs)
        return self

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


class JobPosition(HorillaModel):
    """
    JobPosition model
    """

    job_position = models.CharField(max_length=50, blank=False, null=False)
    department_id = models.ForeignKey(
        Department,
        on_delete=models.PROTECT,
        related_name="job_position",
        verbose_name=_("Department"),
    )
    company_id = models.ManyToManyField(Company, blank=True, verbose_name=_("Company"))

    objects = HorillaCompanyManager("department_id__company_id")

    class Meta:
        """
        Meta class to add additional options
        """

        verbose_name = _("Job Position")
        verbose_name_plural = _("Job Positions")

    def __str__(self):
        return str(self.job_position + " - (" + self.department_id.department) + ")"


class JobRole(HorillaModel):
    """JobRole model"""

    job_position_id = models.ForeignKey(
        JobPosition, on_delete=models.PROTECT, verbose_name=_("Job Position")
    )
    job_role = models.CharField(max_length=50, blank=False, null=True)
    company_id = models.ManyToManyField(Company, blank=True, verbose_name=_("Company"))

    objects = HorillaCompanyManager("job_position_id__department_id__company_id")

    class Meta:
        """
        Meta class to add additional options
        """

        verbose_name = _("Job Role")
        verbose_name_plural = _("Job Roles")
        unique_together = ("job_position_id", "job_role")

    def __str__(self):
        return f"{self.job_role} - {self.job_position_id.job_position}"


class WorkType(HorillaModel):
    """
    WorkType model
    """

    work_type = models.CharField(max_length=50)
    company_id = models.ManyToManyField(Company, blank=True, verbose_name=_("Company"))

    objects = HorillaCompanyManager()

    class Meta:
        """
        Meta class to add additional options
        """

        verbose_name = _("Work Type")
        verbose_name_plural = _("Work Types")

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

    def clean(self, *args, **kwargs):
        super().clean(*args, **kwargs)
        request = getattr(_thread_locals, "request", None)
        if request and request.POST:
            company = request.POST.getlist("company_id", None)
            work_type = request.POST.get("work_type", None)
            if (
                WorkType.objects.filter(company_id__id__in=company, work_type=work_type)
                .exclude(id=self.id)
                .exists()
            ):
                raise ValidationError("This work type already exists in this company")
        return

    def save(self, *args, **kwargs):
        super().save(*args, **kwargs)
        self.clean(*args, **kwargs)
        return self


class RotatingWorkType(HorillaModel):
    """
    RotatingWorkType model
    """

    name = models.CharField(max_length=50)
    work_type1 = models.ForeignKey(
        WorkType,
        on_delete=models.PROTECT,
        related_name="work_type1",
        verbose_name=_("Work Type 1"),
    )
    work_type2 = models.ForeignKey(
        WorkType,
        on_delete=models.PROTECT,
        related_name="work_type2",
        verbose_name=_("Work Type 2"),
    )
    employee_id = models.ManyToManyField(
        "employee.Employee",
        through="RotatingWorkTypeAssign",
        verbose_name=_("Employee"),
    )
    additional_data = models.JSONField(
        default=dict,
        blank=True,
        null=True,
    )
    objects = HorillaCompanyManager("employee_id__employee_work_info__company_id")

    class Meta:
        """
        Meta class to add additional options
        """

        verbose_name = _("Rotating Work Type")
        verbose_name_plural = _("Rotating Work Types")

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

    def clean(self):
        if self.work_type1 == self.work_type2:
            raise ValidationError(_("Select different work type continuously"))

        additional_work_types = (
            self.additional_data.get("additional_work_types", [])
            if self.additional_data
            else []
        )

        if (
            additional_work_types
            and str(self.work_type2.id) == additional_work_types[0]
        ):
            raise ValidationError(_("Select different work type continuously"))

        if (
            additional_work_types
            and str(self.work_type1.id) == additional_work_types[-1]
        ):
            raise ValidationError(_("Select different work type continuously"))

        for i in range(len(additional_work_types) - 1):
            if additional_work_types[i] and additional_work_types[i + 1]:
                if additional_work_types[i] == additional_work_types[i + 1]:
                    raise ValidationError(_("Select different work type continuously"))

    def additional_work_types(self):
        rotating_work_type = RotatingWorkType.objects.get(id=self.pk)
        additional_data = rotating_work_type.additional_data
        if additional_data:
            additional_work_type_ids = additional_data.get("additional_work_types")
            if additional_work_type_ids:
                additional_work_types = WorkType.objects.filter(
                    id__in=additional_work_type_ids
                )
            else:
                additional_work_types = None
        else:
            additional_work_types = None
        return additional_work_types


DAY_DATE = [(str(i), str(i)) for i in range(1, 32)]
DAY_DATE.append(("last", _("Last Day")))
DAY = [
    ("monday", _("Monday")),
    ("tuesday", _("Tuesday")),
    ("wednesday", _("Wednesday")),
    ("thursday", _("Thursday")),
    ("friday", _("Friday")),
    ("saturday", _("Saturday")),
    ("sunday", _("Sunday")),
]
BASED_ON = [
    ("after", _("After")),
    ("weekly", _("Weekend")),
    ("monthly", _("Monthly")),
]


class RotatingWorkTypeAssign(HorillaModel):
    """
    RotatingWorkTypeAssign model
    """

    employee_id = models.ForeignKey(
        "employee.Employee",
        on_delete=models.PROTECT,
        null=True,
        verbose_name=_("Employee"),
    )
    rotating_work_type_id = models.ForeignKey(
        RotatingWorkType, on_delete=models.PROTECT, verbose_name=_("Rotating Work Type")
    )
    start_date = models.DateField(
        default=django.utils.timezone.now, verbose_name=_("Start Date")
    )
    next_change_date = models.DateField(null=True, verbose_name=_("Next Switch"))
    current_work_type = models.ForeignKey(
        WorkType,
        null=True,
        on_delete=models.PROTECT,
        related_name="current_work_type",
        verbose_name=_("Current Work Type"),
    )
    next_work_type = models.ForeignKey(
        WorkType,
        null=True,
        on_delete=models.PROTECT,
        related_name="next_work_type",
        verbose_name=_("Next Work Type"),
    )
    based_on = models.CharField(
        max_length=10,
        choices=BASED_ON,
        null=False,
        blank=False,
        verbose_name=_("Based On"),
    )
    rotate_after_day = models.IntegerField(
        default=7, verbose_name=_("Rotate After Day")
    )
    rotate_every_weekend = models.CharField(
        max_length=10,
        default="monday",
        choices=DAY,
        blank=True,
        null=True,
        verbose_name=_("Rotate Every Weekend"),
    )
    rotate_every = models.CharField(
        max_length=10,
        default="1",
        choices=DAY_DATE,
        verbose_name=_("Rotate Every Month"),
    )
    additional_data = models.JSONField(
        default=dict,
        blank=True,
        null=True,
    )
    history = HorillaAuditLog(
        related_name="history_set",
        bases=[
            HorillaAuditInfo,
        ],
    )
    objects = HorillaCompanyManager("employee_id__employee_work_info__company_id")

    class Meta:
        """
        Meta class to add additional options
        """

        verbose_name = _("Rotating Work Type Assign")
        verbose_name_plural = _("Rotating Work Type Assigns")
        ordering = ["-next_change_date", "-employee_id__employee_first_name"]

    def clean(self):
        if self.is_active and self.employee_id is not None:
            # Check if any other active record with the same parent already exists
            siblings = RotatingWorkTypeAssign.objects.filter(
                is_active=True, employee_id=self.employee_id
            )
            if siblings.exists() and siblings.first().id != self.id:
                raise ValidationError(_("Only one active record allowed per employee"))
        if self.start_date < django.utils.timezone.now().date():
            raise ValidationError(_("Date must be greater than or equal to today"))


class EmployeeType(HorillaModel):
    """
    EmployeeType model
    """

    employee_type = models.CharField(max_length=50)
    company_id = models.ManyToManyField(Company, blank=True, verbose_name=_("Company"))

    objects = HorillaCompanyManager("employee_id__employee_work_info__company_id")

    class Meta:
        """
        Meta class to add additional options
        """

        verbose_name = _("Employee Type")
        verbose_name_plural = _("Employee Types")

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

    def clean(self, *args, **kwargs):
        super().clean(*args, **kwargs)
        request = getattr(_thread_locals, "request", None)
        if request and request.POST:
            company = request.POST.getlist("company_id", None)
            employee_type = request.POST.get("employee_type", None)
            if (
                EmployeeType.objects.filter(
                    company_id__id__in=company, employee_type=employee_type
                )
                .exclude(id=self.id)
                .exists()
            ):
                raise ValidationError(
                    "This employee type already exists in this company"
                )
        return

    def save(self, *args, **kwargs):
        super().save(*args, **kwargs)
        self.clean(*args, **kwargs)
        return self


class EmployeeShiftDay(models.Model):
    """
    EmployeeShiftDay model
    """

    day = models.CharField(max_length=20, choices=DAY)
    company_id = models.ManyToManyField(Company, blank=True, verbose_name=_("Company"))

    objects = HorillaCompanyManager()

    class Meta:
        """
        Meta class to add additional options
        """

        verbose_name = _("Employee Shift Day")
        verbose_name_plural = _("Employee Shift Days")

    def __str__(self) -> str:
        return str(_(self.day).capitalize())


class EmployeeShift(HorillaModel):
    """
    EmployeeShift model
    """

    employee_shift = models.CharField(
        max_length=50,
        null=False,
        blank=False,
    )
    days = models.ManyToManyField(EmployeeShiftDay, through="EmployeeShiftSchedule")
    weekly_full_time = models.CharField(
        max_length=6,
        default="40:00",
        null=True,
        blank=True,
        validators=[validate_time_format],
    )
    full_time = models.CharField(
        max_length=6, default="200:00", validators=[validate_time_format]
    )
    company_id = models.ManyToManyField(Company, blank=True, verbose_name=_("Company"))
    if apps.is_installed("attendance"):
        grace_time_id = models.ForeignKey(
            "attendance.GraceTime",
            null=True,
            blank=True,
            related_name="employee_shift",
            on_delete=models.PROTECT,
            verbose_name=_("Grace Time"),
        )

    objects = HorillaCompanyManager("employee_shift__company_id")

    class Meta:
        """
        Meta class to add additional options
        """

        verbose_name = _("Employee Shift")
        verbose_name_plural = _("Employee Shifts")

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

    def clean(self, *args, **kwargs):
        super().clean(*args, **kwargs)
        request = getattr(_thread_locals, "request", None)
        if request and request.POST:
            company = request.POST.getlist("company_id", None)
            employee_shift = request.POST.get("employee_shift", None)
            if (
                EmployeeShift.objects.filter(
                    company_id__id__in=company, employee_shift=employee_shift
                )
                .exclude(id=self.id)
                .exists()
            ):
                raise ValidationError(
                    "This employee shift already exists in this company"
                )
        return

    def save(self, *args, **kwargs):
        super().save(*args, **kwargs)
        self.clean(*args, **kwargs)
        return self


from django.db.models import Case, When


class EmployeeShiftSchedule(HorillaModel):
    """
    EmployeeShiftSchedule model
    """

    day = models.ForeignKey(
        EmployeeShiftDay,
        on_delete=models.PROTECT,
        related_name="day_schedule",
        verbose_name=_("Shift Day"),
    )
    shift_id = models.ForeignKey(
        EmployeeShift, on_delete=models.PROTECT, verbose_name=_("Shift")
    )
    minimum_working_hour = models.CharField(
        default="08:15",
        max_length=5,
        validators=[validate_time_format],
        verbose_name=_("Minimum Working Hours"),
    )
    start_time = models.TimeField(null=True, verbose_name=_("Start Time"))
    end_time = models.TimeField(null=True, verbose_name=_("End Time"))
    is_night_shift = models.BooleanField(default=False, verbose_name=_("Night Shift"))
    is_auto_punch_out_enabled = models.BooleanField(
        default=False,
        verbose_name=_("Enable Automatic Check Out"),
        help_text=_("Enable this to trigger automatic check out."),
    )
    auto_punch_out_time = models.TimeField(
        null=True,
        blank=True,
        verbose_name=_("Automatic Check Out Time"),
        help_text=_(
            "Time at which the horilla will automatically check out the employee attendance if they forget."
        ),
    )
    company_id = models.ManyToManyField(Company, blank=True, verbose_name=_("Company"))

    objects = HorillaCompanyManager("shift_id__employee_shift__company_id")

    class Meta:
        """
        Meta class to add additional options
        """

        verbose_name = _("Employee Shift Schedule")
        verbose_name_plural = _("Employee Shift Schedules")
        unique_together = [["shift_id", "day"]]
        ordering = [
            Case(
                When(day__day="monday", then=0),
                When(day__day="tuesday", then=1),
                When(day__day="wednesday", then=2),
                When(day__day="thursday", then=3),
                When(day__day="friday", then=4),
                When(day__day="saturday", then=5),
                When(day__day="sunday", then=6),
                default=7,
            )
        ]

    def __str__(self) -> str:
        return f"{self.shift_id.employee_shift} {self.day}"

    def save(self, *args, **kwargs):
        if self.start_time and self.end_time:
            self.is_night_shift = self.start_time > self.end_time
        super().save(*args, **kwargs)


class RotatingShift(HorillaModel):
    """
    RotatingShift model
    """

    name = models.CharField(max_length=50)
    employee_id = models.ManyToManyField(
        "employee.Employee", through="RotatingShiftAssign", verbose_name=_("Employee")
    )
    shift1 = models.ForeignKey(
        EmployeeShift,
        related_name="shift1",
        on_delete=models.PROTECT,
        verbose_name=_("Shift 1"),
    )
    shift2 = models.ForeignKey(
        EmployeeShift,
        related_name="shift2",
        on_delete=models.PROTECT,
        verbose_name=_("Shift 2"),
    )
    additional_data = models.JSONField(
        default=dict,
        blank=True,
        null=True,
    )
    objects = HorillaCompanyManager("employee_id__employee_work_info__company_id")

    class Meta:
        """
        Meta class to add additional options
        """

        verbose_name = _("Rotating Shift")
        verbose_name_plural = _("Rotating Shifts")

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

    def clean(self):
        if self.shift1 == self.shift2:
            raise ValidationError(_("Select different shift continuously"))

        additional_shifts = (
            self.additional_data.get("additional_shifts", [])
            if self.additional_data
            else []
        )

        if additional_shifts and str(self.shift2.id) == additional_shifts[0]:
            raise ValidationError(_("Select different shift continuously"))

        if additional_shifts and str(self.shift1.id) == additional_shifts[-1]:
            raise ValidationError(_("Select different shift continuously"))

        for i in range(len(additional_shifts) - 1):
            if additional_shifts[i] and additional_shifts[i + 1]:
                if additional_shifts[i] == additional_shifts[i + 1]:
                    raise ValidationError(_("Select different shift continuously"))

    def additional_shifts(self):
        rotating_shift = RotatingShift.objects.get(id=self.pk)
        additional_data = rotating_shift.additional_data
        if additional_data:
            additional_shift_ids = additional_data.get("additional_shifts")
            if additional_shift_ids:
                additional_shifts = EmployeeShift.objects.filter(
                    id__in=additional_shift_ids
                )
            else:
                additional_shifts = None
        else:
            additional_shifts = None
        return additional_shifts


class RotatingShiftAssign(HorillaModel):
    """
    RotatingShiftAssign model
    """

    employee_id = models.ForeignKey(
        "employee.Employee", on_delete=models.PROTECT, verbose_name=_("Employee")
    )
    rotating_shift_id = models.ForeignKey(
        RotatingShift, on_delete=models.PROTECT, verbose_name=_("Rotating Shift")
    )
    start_date = models.DateField(
        default=django.utils.timezone.now, verbose_name=_("Start Date")
    )
    next_change_date = models.DateField(null=True, verbose_name=_("Next Switch"))
    current_shift = models.ForeignKey(
        EmployeeShift,
        on_delete=models.PROTECT,
        null=True,
        related_name="current_shift",
        verbose_name=_("Current Shift"),
    )
    next_shift = models.ForeignKey(
        EmployeeShift,
        on_delete=models.PROTECT,
        null=True,
        related_name="next_shift",
        verbose_name=_("Next Shift"),
    )
    based_on = models.CharField(
        max_length=10,
        choices=BASED_ON,
        null=False,
        blank=False,
        verbose_name=_("Based On"),
    )
    rotate_after_day = models.IntegerField(
        null=True, blank=True, default=7, verbose_name=_("Rotate After Day")
    )
    rotate_every_weekend = models.CharField(
        max_length=10,
        default="monday",
        choices=DAY,
        blank=True,
        null=True,
        verbose_name=_("Rotate Every Weekend"),
    )
    rotate_every = models.CharField(
        max_length=10,
        blank=True,
        null=True,
        default="1",
        choices=DAY_DATE,
        verbose_name=_("Rotate Every Month"),
    )
    additional_data = models.JSONField(
        default=dict,
        blank=True,
        null=True,
    )
    history = HorillaAuditLog(
        related_name="history_set",
        bases=[
            HorillaAuditInfo,
        ],
    )
    objects = HorillaCompanyManager("employee_id__employee_work_info__company_id")

    class Meta:
        """
        Meta class to add additional options
        """

        verbose_name = _("Rotating Shift Assign")
        verbose_name_plural = _("Rotating Shift Assigns")
        ordering = ["-next_change_date", "-employee_id__employee_first_name"]

    def clean(self):
        if self.is_active and self.employee_id_id is not None:
            # Check if any other active record with the same parent already exists
            siblings = RotatingShiftAssign.objects.filter(
                is_active=True, employee_id__id=self.employee_id_id
            )
            if siblings.exists() and siblings.first().id != self.id:
                raise ValidationError(_("Only one active record allowed per employee"))
        if self.start_date < django.utils.timezone.now().date():
            raise ValidationError(_("Date must be greater than or equal to today"))


class BaserequestFile(models.Model):
    file = models.FileField(upload_to="base/request_files")
    objects = models.Manager()


class WorkTypeRequest(HorillaModel):
    """
    WorkTypeRequest model
    """

    employee_id = models.ForeignKey(
        "employee.Employee",
        on_delete=models.PROTECT,
        null=True,
        related_name="work_type_request",
        verbose_name=_("Employee"),
    )
    work_type_id = models.ForeignKey(
        WorkType,
        on_delete=models.PROTECT,
        related_name="requested_work_type",
        verbose_name=_("Requesting Work Type"),
    )
    previous_work_type_id = models.ForeignKey(
        WorkType,
        on_delete=models.PROTECT,
        null=True,
        blank=True,
        related_name="previous_work_type",
        verbose_name=_("Previous Work Type"),
    )
    requested_date = models.DateField(
        null=True, default=django.utils.timezone.now, verbose_name=_("Requested Date")
    )
    requested_till = models.DateField(
        null=True, blank=True, verbose_name=_("Requested Till")
    )
    description = models.TextField(null=True, verbose_name=_("Description"))
    is_permanent_work_type = models.BooleanField(
        default=False, verbose_name=_("Permanent Request")
    )
    approved = models.BooleanField(default=False, verbose_name=_("Approved"))
    canceled = models.BooleanField(default=False, verbose_name=_("Canceled"))
    work_type_changed = models.BooleanField(default=False)
    history = HorillaAuditLog(
        related_name="history_set",
        bases=[
            HorillaAuditInfo,
        ],
    )
    objects = HorillaCompanyManager("employee_id__employee_work_info__company_id")

    class Meta:
        """
        Meta class to add additional options
        """

        verbose_name = _("Work Type Request")
        verbose_name_plural = _("Work Type Requests")
        permissions = (
            ("approve_worktyperequest", "Approve Work Type Request"),
            ("cancel_worktyperequest", "Cancel Work Type Request"),
        )
        ordering = [
            "-id",
        ]

    def delete(self, *args, **kwargs):
        request = getattr(_thread_locals, "request", None)
        if not self.approved:
            super().delete(*args, **kwargs)
        else:
            if request:
                clear_messages(request)
                messages.warning(request, "The request entry cannot be deleted.")

    def is_any_work_type_request_exists(self):
        approved_work_type_requests_range = WorkTypeRequest.objects.filter(
            employee_id=self.employee_id,
            approved=True,
            canceled=False,
            requested_date__range=[self.requested_date, self.requested_till],
            requested_till__range=[self.requested_date, self.requested_till],
        ).exclude(id=self.id)
        if approved_work_type_requests_range:
            return True
        approved_work_type_requests = WorkTypeRequest.objects.filter(
            employee_id=self.employee_id,
            approved=True,
            canceled=False,
            requested_date__lte=self.requested_date,
            requested_till__gte=self.requested_date,
        ).exclude(id=self.id)
        if approved_work_type_requests:
            return True
        if self.requested_till:
            approved_work_type_requests_2 = WorkTypeRequest.objects.filter(
                employee_id=self.employee_id,
                approved=True,
                canceled=False,
                requested_date__lte=self.requested_till,
                requested_till__gte=self.requested_till,
            ).exclude(id=self.id)
            if approved_work_type_requests_2:
                return True
        approved_permanent_req = WorkTypeRequest.objects.filter(
            employee_id=self.employee_id,
            approved=True,
            canceled=False,
            requested_date__exact=self.requested_date,
        )
        if approved_permanent_req:
            return True
        return False

    def clean(self):
        request = getattr(horilla_middlewares._thread_locals, "request", None)
        if not request.user.is_superuser:
            if self.requested_date < django.utils.timezone.now().date():
                raise ValidationError(_("Date must be greater than or equal to today"))
        if self.requested_till and self.requested_till < self.requested_date:
            raise ValidationError(
                _("End date must be greater than or equal to start date")
            )
        if self.is_any_work_type_request_exists():
            raise ValidationError(
                _("A work type request already exists during this time period.")
            )
        if not self.is_permanent_work_type:
            if not self.requested_till:
                raise ValidationError(_("Requested till field is required."))

    def request_status(self):
        return (
            _("Rejected")
            if self.canceled
            else (_("Approved") if self.approved else _("Requested"))
        )

    def __str__(self) -> str:
        return f"{self.employee_id.employee_first_name} \
            {self.employee_id.employee_last_name} - {self.requested_date}"


class WorkTypeRequestComment(HorillaModel):
    """
    WorkTypeRequestComment Model
    """

    from employee.models import Employee

    request_id = models.ForeignKey(WorkTypeRequest, on_delete=models.CASCADE)
    employee_id = models.ForeignKey(Employee, on_delete=models.CASCADE)
    comment = models.TextField(null=True, verbose_name=_("Comment"))
    files = models.ManyToManyField(BaserequestFile, blank=True)
    objects = models.Manager()

    def __str__(self) -> str:
        return f"{self.comment}"


class ShiftRequest(HorillaModel):
    """
    ShiftRequest model
    """

    employee_id = models.ForeignKey(
        "employee.Employee",
        on_delete=models.PROTECT,
        null=True,
        related_name="shift_request",
        verbose_name=_("Employee"),
    )
    shift_id = models.ForeignKey(
        EmployeeShift,
        on_delete=models.PROTECT,
        related_name="requested_shift",
        verbose_name=_("Requesting Shift"),
    )
    previous_shift_id = models.ForeignKey(
        EmployeeShift,
        on_delete=models.PROTECT,
        null=True,
        blank=True,
        related_name="previous_shift",
        verbose_name=_("Previous Shift"),
    )
    requested_date = models.DateField(
        null=True, default=django.utils.timezone.now, verbose_name=_("Requested Date")
    )
    reallocate_to = models.ForeignKey(
        "employee.Employee",
        on_delete=models.PROTECT,
        null=True,
        blank=True,
        related_name="reallocate_shift_request",
        verbose_name=_("Reallocate Employee"),
    )
    reallocate_approved = models.BooleanField(default=False, verbose_name=_("Approved"))
    reallocate_canceled = models.BooleanField(default=False, verbose_name=_("Canceled"))
    requested_till = models.DateField(
        null=True, blank=True, verbose_name=_("Requested Till")
    )
    description = models.TextField(null=True, verbose_name=_("Description"))
    is_permanent_shift = models.BooleanField(
        default=False, verbose_name=_("Permanent Request")
    )
    approved = models.BooleanField(default=False, verbose_name=_("Approved"))
    canceled = models.BooleanField(default=False, verbose_name=_("Canceled"))
    shift_changed = models.BooleanField(default=False)
    history = HorillaAuditLog(
        related_name="history_set",
        bases=[
            HorillaAuditInfo,
        ],
    )
    objects = HorillaCompanyManager("employee_id__employee_work_info__company_id")

    class Meta:
        """
        Meta class to add additional options
        """

        verbose_name = _("Shift Request")
        verbose_name_plural = _("Shift Requests")
        permissions = (
            ("approve_shiftrequest", "Approve Shift Request"),
            ("cancel_shiftrequest", "Cancel Shift Request"),
        )
        ordering = [
            "-id",
        ]

    def clean(self):

        request = getattr(horilla_middlewares._thread_locals, "request", None)
        if not request.user.is_superuser:
            if not self.pk and self.requested_date < django.utils.timezone.now().date():
                raise ValidationError(_("Date must be greater than or equal to today"))
        if self.requested_till and self.requested_till < self.requested_date:
            raise ValidationError(
                _("End date must be greater than or equal to start date")
            )
        if self.is_any_request_exists():
            raise ValidationError(
                _("An approved shift request already exists during this time period.")
            )
        if not self.is_permanent_shift:
            if not self.requested_till:
                raise ValidationError(_("Requested till field is required."))

    def is_any_request_exists(self):
        approved_shift_requests_range = ShiftRequest.objects.filter(
            employee_id=self.employee_id,
            approved=True,
            canceled=False,
            requested_date__range=[self.requested_date, self.requested_till],
            requested_till__range=[self.requested_date, self.requested_till],
        ).exclude(id=self.id)
        if approved_shift_requests_range:
            return True
        approved_shift_requests = ShiftRequest.objects.filter(
            employee_id=self.employee_id,
            approved=True,
            canceled=False,
            requested_date__lte=self.requested_date,
            requested_till__gte=self.requested_date,
        ).exclude(id=self.id)
        if approved_shift_requests:
            return True
        if self.requested_till:
            approved_shift_requests_2 = ShiftRequest.objects.filter(
                employee_id=self.employee_id,
                approved=True,
                canceled=False,
                requested_date__lte=self.requested_till,
                requested_till__gte=self.requested_till,
            ).exclude(id=self.id)
            if approved_shift_requests_2:
                return True
        approved_permanent_req = ShiftRequest.objects.filter(
            employee_id=self.employee_id,
            approved=True,
            canceled=False,
            requested_date__exact=self.requested_date,
        )
        if approved_permanent_req:
            return True
        return False

    def save(self, *args, **kwargs):
        super().save(*args, **kwargs)

    def delete(self, *args, **kwargs):
        request = getattr(_thread_locals, "request", None)
        if not self.approved:
            super().delete(*args, **kwargs)
        else:
            if request:
                clear_messages(request)
                messages.warning(request, "The request entry cannot be deleted.")

    def __str__(self) -> str:
        return f"{self.employee_id.employee_first_name} \
            {self.employee_id.employee_last_name} - {self.requested_date}"


class ShiftRequestComment(HorillaModel):
    """
    ShiftRequestComment Model
    """

    from employee.models import Employee

    request_id = models.ForeignKey(ShiftRequest, on_delete=models.CASCADE)
    employee_id = models.ForeignKey(Employee, on_delete=models.CASCADE)
    files = models.ManyToManyField(BaserequestFile, blank=True)
    comment = models.TextField(null=True, verbose_name=_("Comment"))
    objects = models.Manager()

    def __str__(self) -> str:
        return f"{self.comment}"


class Tags(HorillaModel):
    title = models.CharField(max_length=30)
    color = models.CharField(max_length=30)
    company_id = models.ForeignKey(
        Company, null=True, editable=False, on_delete=models.PROTECT
    )
    objects = HorillaCompanyManager(related_company_field="company_id")

    def __str__(self):
        return self.title


class HorillaMailTemplate(HorillaModel):
    title = models.CharField(max_length=25, unique=True)
    body = models.TextField()
    company_id = models.ForeignKey(
        Company,
        null=True,
        blank=True,
        on_delete=models.CASCADE,
        verbose_name=_("Company"),
    )
    objects = HorillaCompanyManager(related_company_field="company_id")

    def __str__(self) -> str:
        return f"{self.title}"


class DynamicEmailConfiguration(HorillaModel):
    """
    SingletonModel to keep the mail server configurations
    """

    host = models.CharField(null=True, max_length=256, verbose_name=_("Email Host"))

    port = models.SmallIntegerField(null=True, verbose_name=_("Email Port"))

    from_email = models.EmailField(
        null=True, max_length=256, verbose_name=_("Default From Email")
    )

    username = models.CharField(
        null=True,
        max_length=256,
        verbose_name=_("Email Host Username"),
    )

    display_name = models.CharField(
        null=True,
        max_length=256,
        verbose_name=_("Display Name"),
    )

    password = models.CharField(
        null=True,
        max_length=256,
        verbose_name=_("Email Authentication Password"),
    )

    use_tls = models.BooleanField(default=True, verbose_name=_("Use TLS"))

    use_ssl = models.BooleanField(default=False, verbose_name=_("Use SSL"))

    fail_silently = models.BooleanField(default=False, verbose_name=_("Fail Silently"))

    is_primary = models.BooleanField(
        default=False, verbose_name=_("Primary Mail Server")
    )

    timeout = models.SmallIntegerField(
        null=True, verbose_name=_("Email Send Timeout (seconds)")
    )
    company_id = models.OneToOneField(
        Company, on_delete=models.CASCADE, null=True, blank=True
    )

    def clean(self):
        if self.use_ssl and self.use_tls:
            raise ValidationError(
                _(
                    '"Use TLS" and "Use SSL" are mutually exclusive, '
                    "so only set one of those settings to True."
                )
            )
        if not self.company_id and not self.is_primary:
            raise ValidationError({"company_id": _("This field is required")})

    def __str__(self):
        return self.username

    def save(self, *args, **kwargs) -> None:
        if self.is_primary:
            DynamicEmailConfiguration.objects.filter(is_primary=True).update(
                is_primary=False
            )
        if not DynamicEmailConfiguration.objects.exists():
            self.is_primary = True

        super().save(*args, **kwargs)
        servers_same_company = DynamicEmailConfiguration.objects.filter(
            company_id=self.company_id
        ).exclude(id=self.id)
        if servers_same_company.exists():
            self.delete()
        return

    class Meta:
        verbose_name = _("Email Configuration")


FIELD_CHOICE = [
    ("", "---------"),
    ("requested_days", _("Leave Requested Days")),
]
CONDITION_CHOICE = [
    ("equal", _("Equal (==)")),
    ("notequal", _("Not Equal (!=)")),
    ("range", _("Range")),
    ("lt", _("Less Than (<)")),
    ("gt", _("Greater Than (>)")),
    ("le", _("Less Than or Equal To (<=)")),
    ("ge", _("Greater Than or Equal To (>=)")),
    ("icontains", _("Contains")),
]


class MultipleApprovalCondition(HorillaModel):
    department = models.ForeignKey(Department, on_delete=models.CASCADE)
    condition_field = models.CharField(
        max_length=255,
        choices=FIELD_CHOICE,
    )
    condition_operator = models.CharField(
        max_length=255, choices=CONDITION_CHOICE, null=True, blank=True
    )
    condition_value = models.CharField(
        max_length=100,
        null=True,
        blank=True,
        verbose_name=_("Condition Value"),
    )
    condition_start_value = models.CharField(
        max_length=100,
        null=True,
        blank=True,
        verbose_name=_("Starting Value"),
    )
    condition_end_value = models.CharField(
        max_length=100,
        null=True,
        blank=True,
        verbose_name=_("Ending Value"),
    )
    objects = models.Manager()
    company_id = models.ForeignKey(
        Company,
        null=True,
        blank=True,
        on_delete=models.CASCADE,
        verbose_name=_("Company"),
    )

    def __str__(self) -> str:
        return f"{self.condition_field} {self.condition_operator}"

    def clean(self, *args, **kwargs):
        if self.condition_value:
            instance = MultipleApprovalCondition.objects.filter(
                department=self.department,
                condition_field=self.condition_field,
                condition_operator=self.condition_operator,
                condition_value=self.condition_value,
                company_id=self.company_id,
            ).exclude(id=self.pk)
            if instance:
                raise ValidationError(
                    _("A condition with the provided fields already exists")
                )
        if self.condition_field == "requested_days":
            if self.condition_operator != "range":
                if not self.condition_value:
                    raise ValidationError(
                        {
                            "condition_operator": _(
                                "Please enter a numeric value for condition value"
                            )
                        }
                    )
                try:
                    float_value = float(self.condition_value)
                except ValueError as e:
                    raise ValidationError(
                        {
                            "condition_operator": _(
                                "Please enter a valid numeric value for the condition value when the condition field is Leave Requested Days."
                            )
                        }
                    )
            else:
                if not self.condition_start_value or not self.condition_end_value:
                    raise ValidationError(
                        {
                            "condition_operator": _(
                                "Please specify condition value range"
                            )
                        }
                    )
                try:
                    start_value = float(self.condition_start_value)
                except ValueError as e:
                    raise ValidationError(
                        {
                            "condition_operator": _(
                                "Please enter a valid numeric value for the starting value when the condition field is Leave Requested Days."
                            )
                        }
                    )
                try:
                    end_value = float(self.condition_end_value)
                except ValueError as e:
                    raise ValidationError(
                        {
                            "condition_operator": _(
                                "Please enter a valid numeric value for the ending value when the condition field is Leave Requested Days."
                            )
                        }
                    )

                if start_value == end_value:
                    raise ValidationError(
                        {
                            "condition_operator": _(
                                "End value must be different from the start value in a range."
                            )
                        }
                    )
                if end_value <= start_value:
                    raise ValidationError(
                        {
                            "condition_operator": _(
                                "End value must be greater than the start value in a range."
                            )
                        }
                    )
        super().clean(*args, **kwargs)

    def save(self, *args, **kwargs):
        if self.condition_operator != "range":
            self.condition_start_value = None
            self.condition_end_value = None
        else:
            self.condition_value = None
        super().save(*args, **kwargs)

    def approval_managers(self, *args, **kwargs):
        managers = []
        from employee.models import Employee

        queryset = MultipleApprovalManagers.objects.filter(
            condition_id=self.pk
        ).order_by("sequence")
        for query in queryset:
            employee = Employee.objects.get(id=query.employee_id)
            managers.append(employee)

        return managers


class MultipleApprovalManagers(models.Model):
    condition_id = models.ForeignKey(
        MultipleApprovalCondition, on_delete=models.CASCADE
    )
    sequence = models.IntegerField(null=False, blank=False)
    employee_id = models.IntegerField(null=False, blank=False)
    objects = models.Manager()


class DynamicPagination(models.Model):
    """
    model for storing pagination for employees
    """

    from django.contrib.auth.models import User
    from django.core.validators import MinValueValidator

    user_id = models.OneToOneField(
        User,
        on_delete=models.CASCADE,
        blank=True,
        null=True,
        related_name="dynamic_pagination",
        verbose_name=_("User"),
    )
    pagination = models.IntegerField(default=50, validators=[MinValueValidator(1)])
    objects = models.Manager()

    def save(self, *args, **kwargs):
        request = getattr(_thread_locals, "request", None)
        user = request.user
        self.user_id = user
        super().save(*args, **kwargs)

    def __str__(self):
        return f"{self.user_id}|{self.pagination}"


class Attachment(models.Model):
    """
    Attachment model for multiple attachments in announcements.
    """

    file = models.FileField(upload_to="attachments/")

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


class AnnouncementExpire(models.Model):
    """
    This model for setting a expire days for announcement if no expire date for announcement
    """

    days = models.IntegerField(null=True, blank=True, default=30)
    objects = models.Manager()


class Announcement(HorillaModel):
    """
    Announcement Model for storing all announcements.
    """

    from employee.models import Employee

    title = models.CharField(max_length=100)
    description = models.TextField(null=True)
    attachments = models.ManyToManyField(
        Attachment, related_name="announcement_attachments", blank=True
    )
    expire_date = models.DateField(null=True, blank=True)
    employees = models.ManyToManyField(
        Employee, related_name="announcement_employees", blank=True
    )
    department = models.ManyToManyField(Department, blank=True)
    job_position = models.ManyToManyField(JobPosition, blank=True)
    company_id = models.ManyToManyField(
        Company,
        blank=True,
        related_name="announcement",
    )
    disable_comments = models.BooleanField(default=False)
    objects = HorillaCompanyManager(related_company_field="company_id")

    def get_views(self):
        """
        This method is used to get the view count of the announcement
        """
        return self.announcementview_set.filter(viewed=True)

    def viewed_by(self):

        viewed_by = AnnouncementView.objects.filter(
            announcement_id__id=self.id, viewed=True
        )
        viewed_emp = []
        for i in viewed_by:
            viewed_emp.append(i.user)
        return viewed_emp

    def __str__(self):
        return self.title


class AnnouncementComment(HorillaModel):
    """
    AnnouncementComment Model
    """

    from employee.models import Employee

    announcement_id = models.ForeignKey(Announcement, on_delete=models.CASCADE)
    employee_id = models.ForeignKey(Employee, on_delete=models.CASCADE)
    comment = models.TextField(null=True, verbose_name=_("Comment"), max_length=255)
    objects = models.Manager()


class AnnouncementView(models.Model):
    """
    Announcement View Model
    """

    user = models.ForeignKey(User, on_delete=models.CASCADE)
    announcement = models.ForeignKey(Announcement, on_delete=models.CASCADE)
    viewed = models.BooleanField(default=False)
    created_at = models.DateTimeField(auto_now_add=True, null=True)
    objects = models.Manager()


class EmailLog(models.Model):
    """
    EmailLog Keeping model
    """

    statuses = [("sent", "Sent"), ("failed", "Failed")]
    subject = models.CharField(max_length=255)
    body = models.TextField(max_length=255)
    from_email = models.EmailField()
    to = models.EmailField()
    status = models.CharField(max_length=6, choices=statuses)
    created_at = models.DateTimeField(auto_now_add=True)
    objects = models.Manager()
    company_id = models.ForeignKey(
        Company, on_delete=models.CASCADE, null=True, editable=False
    )


class DriverViewed(models.Model):
    """
    Model to store driver viewed status
    """

    choices = [
        ("dashboard", "dashboard"),
        ("pipeline", "pipeline"),
        ("settings", "settings"),
    ]
    user = models.ForeignKey(User, on_delete=models.CASCADE)
    viewed = models.CharField(max_length=10, choices=choices)

    def user_viewed(self):
        """
        This method is used to access all the viewd driver
        """
        return self.user.driverviewed_set.values_list("viewed", flat=True)


class DashboardEmployeeCharts(HorillaModel):
    from employee.models import Employee

    employee = models.ForeignKey(Employee, on_delete=models.CASCADE)
    charts = models.JSONField(
        verbose_name=_("Excluded Charts"), default=list, blank=True, null=True
    )

    def __str__(self):
        return f"{self.employee} - charts"


class BiometricAttendance(models.Model):
    is_installed = models.BooleanField(default=False)
    company_id = models.ForeignKey(
        Company,
        null=True,
        editable=False,
        on_delete=models.PROTECT,
        related_name="biometric_enabled_company",
    )
    objects = models.Manager()

    def __str__(self):
        return f"{self.is_installed}"


def default_additional_data():
    return {"allowed_ips": []}


class AttendanceAllowedIP(models.Model):
    """
    Represents client IP addresses that are allowed to mark attendance.
    Usage:
        - This model is used to store IP addresses that are permitted to access the attendance system.
        - It ensures that only authorized IP addresses can mark attendance.
    """

    is_enabled = models.BooleanField(default=False)
    additional_data = models.JSONField(
        null=True, blank=True, default=default_additional_data
    )

    def clean(self):
        """
        Validate that all entries in `allowed_ips` are either valid IP addresses or network prefixes.
        """
        allowed_ips = self.additional_data.get("allowed_ips", [])
        for ip in allowed_ips:
            try:
                ipaddress.ip_network(ip)
            except ValueError:
                raise ValidationError(f"Invalid IP address or network prefix: {ip}")

    def __str__(self):
        return f"AttendanceAllowedIP - {self.is_enabled}"


class TrackLateComeEarlyOut(HorillaModel):
    is_enable = models.BooleanField(
        default=True,
        verbose_name=_("Enable"),
        help_text=_(
            "By enabling this, you track the late comes and early outs of employees in their attendance."
        ),
    )

    class Meta:
        verbose_name = _("Track Late Come Early Out")
        verbose_name_plural = _("Track Late Come Early Outs")

    def __str__(self):
        tracking = _("enabled") if self.is_enable else _("disabled")
        return f"Tracking late come early out {tracking}"


class Holidays(HorillaModel):
    name = models.CharField(max_length=30, null=False, verbose_name=_("Name"))
    start_date = models.DateField(verbose_name=_("Start Date"))
    end_date = models.DateField(null=True, blank=True, verbose_name=_("End Date"))
    recurring = models.BooleanField(default=False, verbose_name=_("Recurring"))
    company_id = models.ForeignKey(
        Company,
        null=True,
        on_delete=models.PROTECT,
        verbose_name=_("Company"),
    )
    objects = HorillaCompanyManager(related_company_field="company_id")

    def __str__(self):
        return self.name

    def today_holidays(today=None) -> models.QuerySet:
        """
        Retrieve holidays that overlap with the given date (default is today).

        Args:
            today (date, optional): The date to check for holidays. Defaults to the current date.

        Returns:
            QuerySet: A queryset of `Holidays` instances where the given date falls between
                    `start_date` and `end_date` (inclusive).
        """
        today = today or date.today()
        return Holidays.objects.filter(start_date__lte=today, end_date__gte=today)


class CompanyLeaves(HorillaModel):
    based_on_week = models.CharField(
        max_length=100, choices=WEEKS, blank=True, null=True
    )
    based_on_week_day = models.CharField(max_length=100, choices=WEEK_DAYS)
    company_id = models.ForeignKey(Company, null=True, on_delete=models.PROTECT)
    objects = HorillaCompanyManager(related_company_field="company_id")

    class Meta:
        unique_together = ("based_on_week", "based_on_week_day")

    def __str__(self):
        return f"{dict(WEEK_DAYS).get(self.based_on_week_day)} | {dict(WEEKS).get(self.based_on_week)}"


class PenaltyAccounts(HorillaModel):
    """
    LateComeEarlyOutPenaltyAccount
    """

    employee_id = models.ForeignKey(
        "employee.Employee",
        on_delete=models.PROTECT,
        related_name="penalty_accounts",
        editable=False,
        verbose_name="Employee",
        null=True,
    )
    if apps.is_installed("attendance"):
        late_early_id = models.ForeignKey(
            "attendance.AttendanceLateComeEarlyOut",
            on_delete=models.CASCADE,
            null=True,
            editable=False,
        )
    if apps.is_installed("leave"):
        leave_request_id = models.ForeignKey(
            "leave.LeaveRequest", null=True, on_delete=models.CASCADE, editable=False
        )
        leave_type_id = models.ForeignKey(
            "leave.LeaveType",
            on_delete=models.DO_NOTHING,
            blank=True,
            null=True,
            verbose_name="Leave type",
        )
        minus_leaves = models.FloatField(default=0.0, null=True)
        deduct_from_carry_forward = models.BooleanField(default=False)
    penalty_amount = models.FloatField(default=0.0, null=True)

    def clean(self) -> None:
        super().clean()
        if apps.is_installed("leave") and not self.leave_type_id and self.minus_leaves:
            raise ValidationError(
                {"leave_type_id": _("Specify the leave type to deduct the leave.")}
            )
        if apps.is_installed("leave") and self.leave_type_id and not self.minus_leaves:
            raise ValidationError(
                {
                    "minus_leaves": _(
                        "If a leave type is chosen for a penalty, minus leaves are required."
                    )
                }
            )
        if not self.minus_leaves and not self.penalty_amount:
            raise ValidationError(
                {
                    "leave_type_id": _(
                        "Either minus leaves or a penalty amount is required"
                    )
                }
            )

        if (
            self.minus_leaves or self.deduct_from_carry_forward
        ) and not self.leave_type_id:
            raise ValidationError({"leave_type_id": _("Leave type is required")})
        return

    class Meta:
        ordering = ["-created_at"]


class NotificationSound(models.Model):
    from employee.models import Employee

    employee = models.OneToOneField(
        Employee, on_delete=models.CASCADE, related_name="notification_sound"
    )
    sound_enabled = models.BooleanField(default=False)


@receiver(post_save, sender=PenaltyAccounts)
def create_deduction_cutleave_from_penalty(sender, instance, created, **kwargs):
    """
    This is post save method, used to create deduction and cut availabl leave days"""
    # only work when creating
    if created:
        penalty_amount = instance.penalty_amount
        if apps.is_installed("payroll") and penalty_amount:
            Deduction = get_horilla_model_class(app_label="payroll", model="deduction")
            penalty = Deduction()
            if instance.late_early_id:
                penalty.title = f"{instance.late_early_id.get_type_display()} penalty"
                penalty.one_time_date = (
                    instance.late_early_id.attendance_id.attendance_date
                )
            elif instance.leave_request_id:
                penalty.title = f"Leave penalty {instance.leave_request_id.end_date}"
                penalty.one_time_date = instance.leave_request_id.end_date
            else:
                penalty.title = f"Penalty on {datetime.today()}"
                penalty.one_time_date = datetime.today()
            penalty.include_active_employees = False
            penalty.is_fixed = True
            penalty.amount = instance.penalty_amount
            penalty.only_show_under_employee = True
            penalty.save()
            penalty.include_active_employees = False
            penalty.specific_employees.add(instance.employee_id)
            penalty.save()

        if (
            apps.is_installed("leave")
            and instance.leave_type_id
            and instance.minus_leaves
        ):
            available = instance.employee_id.available_leave.filter(
                leave_type_id=instance.leave_type_id
            ).first()
            unit = round(instance.minus_leaves * 2) / 2
            if not instance.deduct_from_carry_forward:
                available.available_days = max(0, (available.available_days - unit))
            else:
                available.carryforward_days = max(
                    0, (available.carryforward_days - unit)
                )

            available.save()


User.add_to_class("is_new_employee", models.BooleanField(default=False))
