from django.db import models
from django.urls import reverse, reverse_lazy
from django.utils import safestring

from netbox.models import NetBoxModel
from utilities.querysets import RestrictedQuerySet
from utilities.validators import EnhancedURLValidator


class LaxURLField(models.URLField):
    """
    NetBox Custom Field approach, based on utilities.forms.fields.LaxURLField
    Overriding default_validators is needed, as they are always added
    """

    default_validators = [EnhancedURLValidator()]


class SoftwareProduct(NetBoxModel):
    name = models.CharField(max_length=128)
    description = models.CharField(max_length=255, null=True, blank=True)

    manufacturer = models.ForeignKey(to="dcim.Manufacturer", on_delete=models.PROTECT, null=True, blank=True)

    objects = RestrictedQuerySet.as_manager()

    def __str__(self):
        return self.name

    def get_absolute_url(self):
        return reverse("plugins:netbox_slm:softwareproduct", kwargs={"pk": self.pk})

    def get_installation_count(self):
        count = SoftwareProductInstallation.objects.filter(software_product_id=self.pk).count()
        return (
            safestring.mark_safe(
                '<a href="{url}">{count}</a>'.format(
                    url=reverse_lazy("plugins:netbox_slm:softwareproductinstallation_list") + f"?q={self.name}",
                    count=count,
                )
            )
            if count
            else "0"
        )


class SoftwareProductVersion(NetBoxModel):
    name = models.CharField(max_length=64)

    software_product = models.ForeignKey(
        to="netbox_slm.SoftwareProduct",
        on_delete=models.PROTECT,
    )

    objects = RestrictedQuerySet.as_manager()

    def __str__(self):
        return self.name

    def get_absolute_url(self):
        return reverse("plugins:netbox_slm:softwareproductversion", kwargs={"pk": self.pk})

    def get_installation_count(self):
        count = SoftwareProductInstallation.objects.filter(version_id=self.pk).count()
        return (
            safestring.mark_safe(
                '<a href="{url}">{count}</a>'.format(
                    url=reverse_lazy("plugins:netbox_slm:softwareproductinstallation_list") + f"?q={self.name}",
                    count=count,
                )
            )
            if count
            else "0"
        )


class SoftwareProductInstallation(NetBoxModel):
    device = models.ForeignKey(to="dcim.Device", on_delete=models.PROTECT, null=True, blank=True)
    virtualmachine = models.ForeignKey(
        to="virtualization.VirtualMachine", on_delete=models.PROTECT, null=True, blank=True
    )
    software_product = models.ForeignKey(to="netbox_slm.SoftwareProduct", on_delete=models.PROTECT)
    version = models.ForeignKey(to="netbox_slm.SoftwareProductVersion", on_delete=models.PROTECT)

    objects = RestrictedQuerySet.as_manager()

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

    def get_absolute_url(self):
        return reverse("plugins:netbox_slm:softwareproductinstallation", kwargs={"pk": self.pk})

    @property
    def platform(self):
        return self.device or self.virtualmachine

    def render_type(self):
        return "device" if self.device else "virtualmachine"


class SoftwareLicense(NetBoxModel):
    name = models.CharField(max_length=128)
    description = models.CharField(max_length=255, null=True, blank=True)
    type = models.CharField(max_length=128)

    stored_location = models.CharField(max_length=255, null=True, blank=True)
    stored_location_url = LaxURLField(max_length=1024, null=True, blank=True)
    start_date = models.DateField(null=True, blank=True)
    expiration_date = models.DateField(null=True, blank=True)

    software_product = models.ForeignKey(to="netbox_slm.SoftwareProduct", on_delete=models.PROTECT)
    version = models.ForeignKey(to="netbox_slm.SoftwareProductVersion", on_delete=models.PROTECT, null=True, blank=True)
    installation = models.ForeignKey(
        to="netbox_slm.SoftwareProductInstallation", on_delete=models.PROTECT, null=True, blank=True
    )

    objects = RestrictedQuerySet.as_manager()

    def __str__(self):
        return self.name

    def get_absolute_url(self):
        return reverse("plugins:netbox_slm:softwarelicense", kwargs={"pk": self.pk})

    @property
    def stored_location_txt(self):
        if self.stored_location_url and not self.stored_location:
            return "Link"
        return self.stored_location