from django.conf import settings
from django.db import models
from django.contrib.auth.models import (
    BaseUserManager, AbstractBaseUser
)
from django.utils import timezone
import requests
import json
import subprocess
import os
import datetime, time

class MyUserManager(BaseUserManager):
    def create_user(self, email, password=None):
        """
        Creates and saves a User with the given email, date of
        birth and password.
        """
        if not email:
            raise ValueError('Users must have an email address')

        user = self.model(
            email=self.normalize_email(email),
        )

        user.set_password(password)
        user.save(using=self._db)
        return user

    def create_superuser(self, email, password):
        """
        Creates and saves a superuser with the given email, date of
        birth and password.
        """
        user = self.create_user(email,
                                password=password
        )
        user.is_admin = True
        user.save(using=self._db)
        return user


class User(AbstractBaseUser):
    email = models.EmailField(
        verbose_name='email address',
        max_length=191,
        unique=True,
    )
    is_active = models.BooleanField(default=True)
    is_admin = models.BooleanField(default=False)

    objects = MyUserManager()

    USERNAME_FIELD = 'email'
    REQUIRED_FIELDS = []

    def get_full_name(self):
        return self.email

    def get_short_name(self):
        return self.email

    def __str__(self):
        return self.email

    def has_perm(self, perm, obj=None):
        "Does the user have a specific permission?"
        # Simplest possible answer: Yes, always
        return True

    def has_module_perms(self, app_label):
        "Does the user have permissions to view the app `app_label`?"
        # Simplest possible answer: Yes, always
        return True

    @property
    def is_staff(self):
        "Is the user a member of staff?"
        # Simplest possible answer: All admins are staff
        return self.is_admin


class Domain(models.Model):
    created = models.DateTimeField(auto_now_add=True)
    updated = models.DateTimeField(null=True)
    name = models.CharField(max_length=191, unique=True)
    arecord = models.CharField(max_length=255, blank=True)
    aaaarecord = models.CharField(max_length=1024, blank=True)
    dyn = models.BooleanField(default=False)
    owner = models.ForeignKey(settings.AUTH_USER_MODEL, related_name='domains')

    headers = {
        'User-Agent': 'desecapi',
        'X-API-Key': settings.POWERDNS_API_TOKEN,
    }

    def save(self, *args, **kwargs):
        if self.id is None:
            self.pdnsCreate()
            if self.arecord or self.aaaarecord:
                self.pdnsUpdate()
        else:
            orig = Domain.objects.get(id=self.id)
            if self.arecord != orig.arecord or self.aaaarecord != orig.aaaarecord:
                self.pdnsUpdate()
        self.updated = timezone.now()
        super(Domain, self).save(*args, **kwargs) # Call the "real" save() method.

    def pdnsCreate(self):
        payload = {
            "name": self.name + ".",
            "kind": "NATIVE",
            "masters": [],
            "nameservers": [
                "ns1.desec.io.",
                "ns2.desec.io."
            ]
        }
        r = requests.post(settings.POWERDNS_API + '/zones', data=json.dumps(payload), headers=self.headers)
        if r.status_code < 200 or r.status_code >= 300:
            raise Exception(r.text)

    def pdnsUpdate(self):
        if self.arecord:
            a = \
                {
                    "records": [
                            {
                                "type": "A",
                                "name": self.name + ".",
                                "disabled": False,
                                "content": self.arecord,
                            }
                        ],
                    "ttl": 60,
                    "changetype": "REPLACE",
                    "type": "A",
                    "name": self.name + ".",
                }
        else:
            a = \
                {
                    "changetype": "DELETE",
                    "type": "A",
                    "name": self.name + "."
                }

        if self.aaaarecord:
            aaaa = \
                {
                    "records": [
                            {
                                "type": "AAAA",
                                "name": self.name + ".",
                                "disabled": False,
                                "content": self.aaaarecord,
                            }
                        ],
                    "ttl": 60,
                    "changetype": "REPLACE",
                    "type": "AAAA",
                    "name": self.name + ".",
                }
        else:
            aaaa = \
                {
                    "changetype": "DELETE",
                    "type": "AAAA",
                    "name": self.name + "."
                }

        payload = { "rrsets": [a, aaaa] }
        r = requests.patch(settings.POWERDNS_API + '/zones/' + self.name, data=json.dumps(payload), headers=self.headers)
        if r.status_code < 200 or r.status_code >= 300:
            raise Exception(r)

    class Meta:
        ordering = ('created',)


def get_default_value_created():
    return timezone.now()

def get_default_value_due():
    return timezone.now() + datetime.timedelta(days=7)

def get_default_value_mref():
    return "ONDON" + str((timezone.now() - timezone.datetime(1970,1,1,tzinfo=timezone.utc)).total_seconds())


class Donation(models.Model):

    created = models.DateTimeField(default=get_default_value_created)
    name = models.CharField(max_length=255)
    iban = models.CharField(max_length=34)
    bic = models.CharField(max_length=11)
    amount = models.DecimalField(max_digits=8,decimal_places=2)
    message = models.CharField(max_length=255, blank=True)
    due = models.DateTimeField(default=get_default_value_due)
    mref = models.CharField(max_length=32,default=get_default_value_mref)
    email = models.EmailField(max_length=255, blank=True)


    def save(self, *args, **kwargs):
        self.iban = self.iban[:6] + "xxx" # do NOT save account details
        super(Donation, self).save(*args, **kwargs) # Call the "real" save() method.


    class Meta:
        ordering = ('created',)