import socket
import urllib.request
from enum import Enum
from socket import timeout
from urllib.error import URLError
from urllib.request import Request

from bs4 import BeautifulSoup
from django.db import models
from django.utils.functional import cached_property
from ordered_model.models import OrderedModel


class ServiceStatus(Enum):
    OK = 'ok'
    DOWN = 'down'
    UNKNOWN = 'unknown'


class Service(OrderedModel):
    short_name = models.CharField(null=False, max_length=64)
    image = models.ImageField(null=True, blank=True, upload_to='services')
    description = models.TextField(null=True, blank=True)
    port = models.IntegerField(null=True, blank=True, help_text="Used for checking status")
    url = models.URLField()

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

    @cached_property
    def index_request(self):
        try:
            request = Request(self.url, headers={'User-Agent': 'its just me humble status page'})
            return urllib.request.urlopen(request, timeout=1)
        except (URLError, timeout):
            return None

    def get_status(self):
        if self.port:
            a_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
            location = ("localhost", self.port)
            result_of_check = a_socket.connect_ex(location)
            if result_of_check == 0:
                return ServiceStatus.OK
            else:
                return ServiceStatus.DOWN

        if self.index_request and self.index_request.getcode() == 200:
            return ServiceStatus.OK
        else:
            return ServiceStatus.DOWN

    @cached_property
    def image_or_favicon(self):
        if self.image:
            return self.image.url

        if self.index_request:
            parsed_html = BeautifulSoup(self.index_request, features="html.parser")
            link_tags = parsed_html.find_all('link')
            for rel in ['apple-touch-icon', 'shortcut', 'icon']:
                for link_tag in link_tags:
                    if rel in link_tag.attrs['rel']:
                        result = link_tag.attrs['href']
                        if self.url not in result:
                            return self.url + (result if result.startswith("/") else f"/{result}")
                        else:
                            return result