from django.db import models
from django.conf import settings
from django.urls import reverse
from django.core.exceptions import ValidationError

from tickets.models.ticket_list import TicketList


class Ticket(models.Model):
    TICKET_TYPES = (
        (
            "111-121-149-159,110-121-149-159,121-131-149-159,131-141-149,141-151-110,149-151-110,159,151",
            "ST_REQUEST"
        ),
        (
            "210-211-251,211-212-220-238-249,212-221-229-238-249,221-222-238-249,220-211-238-249,229-211-251,222-231-238-249,231-241-238-249,238-231-239-211-212-221-220-222-249,239-231-239-211-212-221-220-222-249,241-251,249-251,251",
            "SERVICE_REQUEST"
        ),
        (
            "320-321-359,321,359",
            "ACCESS_REQUEST"
        ),
        (
            "420-421-459,421,459",
            "NEG_REQUEST"
        )
    )
    
    title = models.CharField(max_length=128)
    ticket_list = models.ForeignKey(TicketList, on_delete=models.CASCADE)
    ticket_type = models.CharField(max_length=1024, choices=TICKET_TYPES)
    status = models.PositiveSmallIntegerField(null=True)
    created_at = models.DateTimeField(auto_now_add=True, editable=False)
    updated_at = models.DateTimeField(auto_now=True)
    due_date = models.DateField()
    created_by = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.SET_NULL, null=True, related_name="created_by", editable=False)
    assigned_to = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.SET_NULL, null=True, blank=True, related_name="assigned_to")
    note = models.TextField(blank=True, null=True)
    priority = models.PositiveSmallIntegerField(default=0)

    def __str__(self):
        return self.title

    def _get_statuses(self) -> list:
        ticket_life_cycle = self.ticket_type
        ticket_life_cycle = ticket_life_cycle.split(",")
        return [part.split("-") for part in ticket_life_cycle]

    def get_available_statuses(self) -> list:
        for status_scenario in self._get_statuses():
            if int(status_scenario[0]) == self.status:
                return status_scenario[1:] if len(status_scenario) > 1 else None

    def set_next_successful_status(self):
        available_statuses = self.get_available_statuses()
        if available_statuses:
            self.status = available_statuses[0]
            self.save()
        else:
            raise ObjectDoesNotExist("Ticket closed")

    def save(self, *args, **kwargs):
        if not self.status:
            self.status = self._get_statuses()[0][0]
        
        super(Ticket, self).save(*args, **kwargs)

    def get_absolute_url(self):
        return reverse("tickets:ticket_detail", kwargs={"ticket_id": self.id})

    class Meta:
        ordering = ["-priority", "created_at"]