from django.db import models
from django.core.validators import RegexValidator


class SIPAccount(models.Model):
    ip = models.GenericIPAddressField()
    username = models.CharField(max_length=255)
    password = models.CharField(max_length=255)
    display_name = models.CharField(max_length=255)

    tone_scheme = models.CharField(max_length=10)

    def __str__(self):
        return f'{self.username}@{self.ip}'

    class Meta:
        verbose_name = "SIP Account"
        verbose_name_plural = "SIP Accounts"
        ordering = ['display_name']


class SnomPhoneType(models.Model):
    model = models.CharField(max_length=255)
    phonebook_function_key = models.IntegerField(default=-1, help_text='if set to anything >+0, phonebook will be provisioned on this key')

    def __str__(self):
        return self.model


class SnomFunctionKey(models.Model):
    phone_type = models.ForeignKey(SnomPhoneType, on_delete=models.CASCADE)
    key_id = models.IntegerField()

    label = models.CharField(max_length=255)
    value = models.CharField(max_length=255)

    def __str__(self):
        return f'{self.phone_type.model}:{self.key_id}'

    class Meta:
        ordering = ['phone_type', 'key_id']

        constraints = [
            models.UniqueConstraint(fields=['phone_type', 'key_id'], name='phone_type_key_id_unique')
        ]


class SnomPhone(models.Model):
    mac_address = models.CharField(max_length=12, validators=[RegexValidator('^[0-9A-F]{12}$')], primary_key=True)
    phone_name = models.CharField(max_length=255)
    admin_password = models.CharField(max_length=255)
    timezone = models.CharField(max_length=10, help_text="https://service.snom.com/display/wiki/timezone", default="GBR-0")

    sip_account = models.ForeignKey(SIPAccount, on_delete=models.PROTECT)
    phone_type = models.ForeignKey(SnomPhoneType, on_delete=models.PROTECT)

    def __str__(self):
        return self.phone_name

    class Meta:
        verbose_name = "Snom Phone"
        verbose_name_plural = "Snom Phones"
        ordering = ['phone_name']