import os
import uuid

from autoslug import AutoSlugField
from django.db import models
from django.urls import reverse

from comments.models import AbstractComment
from loans.models import AbstractLoan
from website.validators import MaxFileSizeValidator


class Category(models.Model):
    name = models.CharField(max_length=256, verbose_name="nom", unique=True)
    slug = AutoSlugField(populate_from="name", unique=True)

    class Meta:
        ordering = ["name"]
        verbose_name = "étagère"

    def __str__(self):
        return self.name

    def get_absolute_url(self):
        return reverse("inventory:category", args=(self.slug,))


class Tag(models.Model):
    name = models.CharField(max_length=256, verbose_name="nom", unique=True)
    slug = AutoSlugField(populate_from="name", unique=True)

    class Meta:
        ordering = ["name"]

    def __str__(self):
        return self.name

    def get_absolute_url(self):
        return reverse("inventory:tag", args=(self.slug,))


def image_uuid_path(instance, filename):
    """
    Compute filename for game images as follow:

        game_img/{random_uuid}.{extension}
    """
    ext = filename.split(".")[-1]
    filename = "%s.%s" % (uuid.uuid4(), ext)
    return os.path.join("uploads/logos", filename)


class Game(models.Model):
    title = models.CharField(verbose_name="Nom de l'outil", max_length=256, unique=True)
    slug = AutoSlugField(populate_from="title", unique=True)

    category = models.ForeignKey(
        Category, on_delete=models.RESTRICT, verbose_name="catégorie"
    )
    tags = models.ManyToManyField(Tag, blank=True, verbose_name="tags")

    description = models.TextField(blank=True, verbose_name="description")
    image = models.ImageField(
        upload_to=image_uuid_path,
        blank=True,
        verbose_name="image",
        help_text="L'image doit peser 512 Kio au maximum",
        validators=[MaxFileSizeValidator(512)],
    )

    missing_elements = models.TextField(blank=True, verbose_name="pièces manquantes")

    class Meta:
        ordering = ["title"]
        verbose_name = "outil"
        verbose_name_plural = "outils"

    def __str__(self):
        return self.title

    def get_player_range(self):
        return ""

    def get_duration_range(self):
        return ""

    def get_absolute_url(self):
        return reverse("inventory:game", args=(self.slug,))


class GameComment(AbstractComment):
    commented_object = models.ForeignKey(
        Game, on_delete=models.CASCADE, related_name="comments", verbose_name="outil"
    )

    class Meta:
        ordering = ["created_on"]
        verbose_name = "commentaire sur un outil"
        verbose_name_plural = "commentaires sur des outils"

    def get_modification_url(self):
        return reverse(
            "inventory:modify_game_comment", args=(self.commented_object.slug, self.id)
        )


class GameLoan(AbstractLoan):
    lent_object = models.ForeignKey(
        Game, on_delete=models.CASCADE, verbose_name="outil emprunté"
    )

    class Meta(AbstractLoan.Meta):
        abstract = False
        permissions = [("can_see_loan_details", "Can see loan details")]