##############################################################################
# Copyright (c) 2016 Max Breitenfeldt and others.
# Copyright (c) 2018 Sawyer Bergeron, Parker Berberian, and others.
#
# All rights reserved. This program and the accompanying materials
# are made available under the terms of the Apache License, Version 2.0
# which accompanies this distribution, and is available at
# http://www.apache.org/licenses/LICENSE-2.0
##############################################################################


from resource_inventory.models import ResourceBundle, ConfigBundle
from account.models import Lab
from django.contrib.auth.models import User
from django.db import models
import resource_inventory.resource_manager


class Scenario(models.Model):
    id = models.AutoField(primary_key=True)
    name = models.CharField(max_length=300)

    def __str__(self):
        return self.name


class Installer(models.Model):
    id = models.AutoField(primary_key=True)
    name = models.CharField(max_length=30)
    sup_scenarios = models.ManyToManyField(Scenario, blank=True)

    def __str__(self):
        return self.name


class Opsys(models.Model):
    id = models.AutoField(primary_key=True)
    name = models.CharField(max_length=100)
    sup_installers = models.ManyToManyField(Installer, blank=True)

    def __str__(self):
        return self.name


class Booking(models.Model):
    id = models.AutoField(primary_key=True)
    owner = models.ForeignKey(User, models.CASCADE, related_name='owner')
    collaborators = models.ManyToManyField(User, related_name='collaborators')
    start = models.DateTimeField()
    end = models.DateTimeField()
    reset = models.BooleanField(default=False)
    jira_issue_id = models.IntegerField(null=True, blank=True)
    jira_issue_status = models.CharField(max_length=50, blank=True)
    purpose = models.CharField(max_length=300, blank=False)
    ext_count = models.IntegerField(default=2)
    resource = models.ForeignKey(ResourceBundle, on_delete=models.SET_NULL, null=True)
    config_bundle = models.ForeignKey(ConfigBundle, on_delete=models.SET_NULL, null=True)
    project = models.CharField(max_length=100, default="", blank=True, null=True)
    lab = models.ForeignKey(Lab, null=True, on_delete=models.SET_NULL)
    pdf = models.TextField(blank=True, default="")

    class Meta:
        db_table = 'booking'

    def save(self, *args, **kwargs):
        """
        Save the booking if self.user is authorized and there is no overlapping booking.
        Raise PermissionError if the user is not authorized
        Raise ValueError if there is an overlapping booking
        """
        if self.start >= self.end:
            raise ValueError('Start date is after end date')
        # conflicts end after booking starts, and start before booking ends
        conflicting_dates = Booking.objects.filter(resource=self.resource).exclude(id=self.id)
        conflicting_dates = conflicting_dates.filter(end__gt=self.start)
        conflicting_dates = conflicting_dates.filter(start__lt=self.end)
        if conflicting_dates.count() > 0:
            raise ValueError('This booking overlaps with another booking')
        return super(Booking, self).save(*args, **kwargs)

    def delete(self, *args, **kwargs):
        res = self.resource
        self.resource = None
        self.save()
        resource_inventory.resource_manager.ResourceManager.getInstance().deleteResourceBundle(res)
        return super(self.__class__, self).delete(*args, **kwargs)

    def __str__(self):
        return str(self.purpose) + ' from ' + str(self.start) + ' until ' + str(self.end)