from django.contrib.auth.models import User
from django.db import models
from softdelete.models import SoftDeleteModel
# Create your models here.


class Client(SoftDeleteModel):
    fio = models.CharField(verbose_name=u'ФИО', max_length=500)
    user = models.OneToOneField(User, on_delete=models.CASCADE, verbose_name=u'Базовый пользователь')
    phone = models.CharField(verbose_name=u'Телефон', max_length=15)

    class Meta:
        verbose_name = "Клиент"
        verbose_name_plural = "Клиенты"

    def __str__(self):
        return f"{self.pk}. {self.fio}"


class ProductCategory(SoftDeleteModel):
    name = models.CharField(verbose_name=u'Имя', max_length=255)

    class Meta:
        verbose_name = "Категория"
        verbose_name_plural = "Категории"

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


class Product(SoftDeleteModel):
    name = models.CharField(verbose_name=u'Имя', max_length=255)
    categories = models.ManyToManyField(ProductCategory, verbose_name=u'Категории', blank=True)
    price = models.BigIntegerField(verbose_name=u'Цена', )

    class Meta:
        verbose_name = "Продукт"
        verbose_name_plural = "Продукты"

    def display_rub(self):
        return self.price / 100
    display_rub.short_description = "В рублях"

    def display_categories(self):
        categories = self.categories.all()
        result = ""
        for category in categories:
            result += f"{category}, "
        return result[:-2]
    display_categories.short_description = "Категории"

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


class ClientBasket(SoftDeleteModel):
    client = models.ForeignKey(User, verbose_name=u'Клиент',  on_delete=models.CASCADE)
    product = models.ForeignKey(Product, verbose_name=u'Продукт', on_delete=models.CASCADE)

    class Meta:
        verbose_name = "Карзина пользователя"
        verbose_name_plural = "Карзины пользователей"

    def clear_basket(self):
        ClientBasket.objects.filter(client=self.client).delete()


class OrderItem(SoftDeleteModel):
    client = models.ForeignKey(User, verbose_name=u'Клиент', on_delete=models.CASCADE)
    product = models.ForeignKey(Product, verbose_name=u'Продукт', on_delete=models.CASCADE)
    count = models.PositiveSmallIntegerField(verbose_name=u'Количество', default=1)

    class Meta:
        verbose_name = "Позиция в ордере"
        verbose_name_plural = "Позиции в ордерах"

    def __str__(self):
        return f'{self.product} {self.count}шт.'


class Order(SoftDeleteModel):
    order_num = models.PositiveIntegerField(verbose_name=u'Номер ордера')
    client = models.ForeignKey(User, verbose_name=u'Клиент', on_delete=models.CASCADE)
    status = models.PositiveSmallIntegerField(verbose_name=u'Статус', default=0)
    items = models.ManyToManyField(OrderItem, verbose_name=u'Позиции', blank=True)

    class Meta:
        verbose_name = "Ордер"
        verbose_name_plural = "Ордера"

    def display_status(self):
        if self.status == 0:
            return "Создан"
        elif self.status == 1:
            return "Ждет оплаты"
        elif self.status == 2:
            return "Оплачен"
        elif self.status == 3:
            return "Доставлен"
        elif self.status == 10:
            return "Отменен"
        else:
            return "Ошибка"
    display_status.short_description = "Статус"

    def display_items(self):
        result = ""
        for item in self.items.all():
            result += f'{item}, '
        return result[:-2]
    display_items.short_description = "Позиции"

    def __str__(self):
        return f'Ордер №{self.order_num} Клиент: {self.client}'


class Transaction(SoftDeleteModel):
    order = models.ForeignKey(Order, verbose_name=u'Ордер', on_delete=models.CASCADE)
    old_status = models.PositiveSmallIntegerField(verbose_name=u'Старый статус', )
    new_status = models.PositiveSmallIntegerField(verbose_name=u'Новый статус', )

    class Meta:
        verbose_name = "Транзакция"
        verbose_name_plural = "Транзакции"

    def __str__(self):
        return f'{self.order.order_num} {self.old_status}->{self.new_status}'