# Copyright © 2022 Aravinth Manivannan <realaravinth@batsense.net>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

from django.db import models
from django.contrib.auth.models import User
from django.utils.http import urlencode
from django.db.utils import IntegrityError
from django.urls import reverse


class InstanceConfiguration(models.Model):
    ID = models.AutoField(primary_key=True)
    name = models.CharField(
        "Name of this configuration",
        unique=True,
        max_length=32,
    )
    rent = models.FloatField("Monthly rent of instance in Euros", null=False)
    ram = models.FloatField(
        "The amount of RAM an instance will have",
        null=False,
    )
    cpu = models.IntegerField(
        "The amount of CPU an instance will have",
        null=False,
    )
    storage = models.FloatField(
        "The amount of storage an instance will have",
        null=False,
    )

    created_at = models.DateTimeField(auto_now_add=True, blank=True)

    @classmethod
    def create_default_configs(cls: "InstanceConfiguration"):
        configs = [
            cls(name="s1-2", rent=10, ram=2, cpu=1, storage=10),
            cls(name="s1-4", rent=20, ram=4, cpu=1, storage=20),
            cls(name="s1-8", rent=40, ram=8, cpu=2, storage=40),
        ]
        for config in configs:
            print(f"[*] Saving configuration {config.name}")
            try:
                config.save()
            except IntegrityError as db_error:
                print(f"[!] Configuration {config.name} exists")
                continue
            except Exception as e:
                print(f"[ERROR] {e}")
                raise e

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

    class Meta:
        constraints = [
            models.UniqueConstraint(
                fields=["ram", "cpu", "storage"], name="no_repeat_config"
            )
        ]


class Instance(models.Model):
    """
    Hostea instances
    """

    owned_by = models.OneToOneField(User, on_delete=models.CASCADE)
    ID = models.AutoField(primary_key=True)
    name = models.CharField(
        "Name of this Instance. Also Serves as subdomain",
        unique=True,
        max_length=200,
    )
    configuration_id = models.ForeignKey(
        InstanceConfiguration, on_delete=models.PROTECT
    )

    created_at = models.DateTimeField(auto_now_add=True, blank=True)

    def __str__(self):
        return f"{self.owned_by}'s instance '{self.name}'"