import uuid
from django.db import models
from django.contrib.auth import get_user_model
from django.contrib.postgres.fields import JSONField


class VM(models.Model):
    vmid = models.IntegerField(primary_key=True)
    owner = models.ForeignKey(get_user_model(), on_delete=models.CASCADE)
    data = JSONField()

    def save(self, *args, **kwargs):
        self.id = 'opennebula' + str(self.data.get("ID"))
        super().save(*args, **kwargs)

    @property
    def cores(self):
        return int(self.data['TEMPLATE']['VCPU'])

    @property
    def ram_in_gb(self):
        return (int(self.data['TEMPLATE']['MEMORY'])/1024.)

    @property
    def disks(self):
        """
        If there is no disk then the key DISK does not exist.

        If there is only one disk, we have a dictionary in the database.

        If there are multiple disks, we have a list of dictionaries in the database.
        """

        disks = []

        if 'DISK' in self.data['TEMPLATE']:
            if type(self.data['TEMPLATE']['DISK']) is dict:
                disks = [ self.data['TEMPLATE']['DISK'] ]
            else:
                disks = self.data['TEMPLATE']['DISK']

        disks = [
            {
                'size_in_gb': int(d['SIZE'])/1024. ,
                'opennebula_source': d['SOURCE'],
                'opennebula_name': d['IMAGE'],
            }
            for d in disks
        ]

        return disks

    @property
    def last_host(self):
        return ((self.data.get('HISTORY_RECORDS', {}) or {}).get('HISTORY', {}) or {}).get('HOSTNAME', None)

    @property
    def graphics(self):
        return self.data.get('TEMPLATE', {}).get('GRAPHICS', {})