from django.core.validators import RegexValidator
from django.db import models
from core.models import Category, Company
from customers.models import Customer, Owner, Location
from users.models import User
from nets.models import Net, IpStatus


class DeviceManufacturer(Company):
    phone_regex = RegexValidator(
        regex=r"^\+?1?\d{9,15}$",
        message="""
                Phone number must be entered in the format: '+999999999'.
                Up to 15 digits allowed.
                """,
    )
    phone_number = models.CharField(
        validators=[phone_regex], max_length=17, blank=True, null=True
    )
    email_address = models.EmailField(null=True, blank=True)
    website = models.URLField(null=True, blank=True)

    class Meta:
        ordering = ["name"]
        verbose_name_plural = "Device Manufacturers"

    def get_absolute_url(self):
        from django.urls import reverse

        return reverse("manufacturer", args=[str(self.id)])


class DeviceCategory(Category):
    class Meta:
        ordering = ["name"]
        verbose_name_plural = "Device Categories"


class HardwareModel(models.Model):
    name = models.CharField(max_length=50)
    manufacturer = models.ForeignKey(
        DeviceManufacturer, on_delete=models.CASCADE
    )

    class Meta:
        ordering = ["name"]

    def __str__(self):
        return self.name


class Device(models.Model):
    name = models.CharField(max_length=50)
    description = models.TextField(blank=True)
    serialnumber = models.CharField(max_length=50, blank=True)
    category = models.ForeignKey(
        DeviceCategory, on_delete=models.SET_NULL, null=True, blank=True
    )
    owner = models.ForeignKey(
        Owner, on_delete=models.SET_NULL, null=True, blank=True
    )
    customer = models.ForeignKey(Customer, on_delete=models.CASCADE)
    manufacturer = models.ForeignKey(
        DeviceManufacturer, models.SET_NULL, null=True, blank=True
    )
    model = models.ForeignKey(
        HardwareModel, models.SET_NULL, null=True, blank=True
    )
    location = models.ForeignKey(
        Location, models.SET_NULL, null=True, blank=True
    )
    user = models.ForeignKey(User, models.SET_NULL, null=True, blank=True)
    installation_date = models.DateField(null=True, blank=True)
    net = models.ManyToManyField(Net, through="DeviceInNet")

    class Meta:
        ordering = ["name"]
        unique_together = ("name", "customer")

    def __str__(self):
        return self.name

    def get_absolute_url(self):
        from django.urls import reverse

        return reverse("device", args=[str(self.id)])


class DeviceInNet(models.Model):
    device = models.ForeignKey(Device, on_delete=models.CASCADE)
    net = models.ForeignKey(Net, on_delete=models.CASCADE)
    ip = models.GenericIPAddressField(verbose_name="IP", blank=True, null=True)
    nic = models.CharField(max_length=50, blank=True, verbose_name="NIC")
    mac_address = models.CharField(
        max_length=50, blank=True, verbose_name="MAC Address"
    )
    ip_status = models.ForeignKey(
        IpStatus,
        models.SET_NULL,
        null=True,
        blank=True,
        verbose_name="IP Status",
    )

    def __str__(self):
        return "{}: {}".format(self.ip, self.ip_status)

    class Meta:
        ordering = ["ip"]
        verbose_name_plural = "Devices in Net"