import uuid
import hashlib

from django.core.validators import MaxValueValidator, MinValueValidator
from django.contrib.auth.models import User
from django.db import models
from django.urls import reverse

from .utils.helpers import logs_dir_path


class Archive(models.Model):
    file = models.FileField(upload_to=logs_dir_path)
    size = models.BigIntegerField(editable=False)
    md5 = models.CharField(max_length=1024, editable=False)
    time_create = models.DateTimeField(auto_now_add=True)
    time_update = models.DateTimeField(auto_now=True)
    ticket = models.ForeignKey(
        'Ticket',
        to_field='number',
        db_column='ticket_number',
        on_delete=models.CASCADE
    )

    def save(self, *args, **kwargs):
        # add file size in bytes
        self.size = self.file.size
        # calculate md5 hash sum and write md5 field to db
        with self.file.open('rb') as f:
            md5 = hashlib.md5()
            for byte_block in iter(lambda: f.read(4096), b""):
                md5.update(byte_block)
            self.md5 = md5.hexdigest()
            # Call the "real" save() method
            super().save(*args, **kwargs)

    def get_absolute_url(self):
        return reverse('collector:download', kwargs={'path': self.file})

    def __str__(self):
        return str(self.file)


class Platform(models.Model):
    name = models.CharField(max_length=20, unique=True)
    pretty_name = models.CharField(max_length=20)

    def get_absolute_url(self):
        return reverse('collector:platform', kwargs={'platform': self.name})

    def __str__(self):
        return self.pretty_name


class Ticket(models.Model):
    number = models.IntegerField(unique=True, db_index=True)
    resolved = models.BooleanField(default=False)
    note = models.TextField(blank=True)
    token = models.UUIDField(unique=True, default=uuid.uuid4, editable=False)
    attempts = models.IntegerField(default=5, validators=[
            MaxValueValidator(10),
            MinValueValidator(0)
        ])
    time_create = models.DateTimeField(auto_now_add=True)
    time_update = models.DateTimeField(auto_now=True)
    platform = models.ForeignKey(
        'Platform',
        to_field='name',
        db_column='platform_name',
        on_delete=models.CASCADE
    )
    user = models.ForeignKey(User, on_delete=models.CASCADE)

    class Meta:
        ordering = ['-time_create']

    def get_absolute_url(self):
        return reverse(
            'collector:ticket',
            kwargs={'platform': self.platform.name, 'ticket': self.number}
        )

    def __str__(self):
        return str(self.number)