from django.conf import settings
from django.db import models
from django.core.files import File
from django.contrib.auth.models import User
from django.utils.translation import ugettext_lazy as _


class Account(models.Model):
    user = models.OneToOneField(
        User
    )
    card_number = models.CharField(
        verbose_name=_('card number'),
        max_length=32,
        unique=True,
        blank=True,
        null=True,
    )
    pin = models.CharField(
        verbose_name=_('PIN'),
        max_length=32,
        blank=True,
    )
    daily_digest = models.BooleanField(
        verbose_name=_('daily digest'),
        default=True,
    )
    credit = models.DecimalField(
        verbose_name=_('credit'),
        max_digits=5,
        decimal_places=2,
        default=0,
    )
    debit_limit = models.DecimalField(
        verbose_name=_('debit limit'),
        max_digits=5,
        decimal_places=2,
        default=None,
        blank=True,
        null=True,
    )
    avatar = models.ImageField(
        verbose_name=_('avatar'),
        upload_to='avatars',
        blank=True,
        null=True,
    )

    def __str__(self):
        return self.user.username

    class Meta:
        verbose_name = _('account')
        verbose_name_plural = _('accounts')


class ProductCategory(models.Model):
    name = models.CharField(
        verbose_name=_('name'),
        max_length=32,
        unique=True,
    )
    comment = models.CharField(
        verbose_name=_('comment'),
        max_length=128,
        blank=True,
    )

    def __str__(self):
        return '%s (%s)' % (self.name, self.comment)

    class Meta:
        verbose_name = _('product category')
        verbose_name_plural = _('product categories')


class Product(models.Model):
    name = models.CharField(
        verbose_name=_('name'),
        max_length=32,
        unique=True,
    )
    price = models.DecimalField(
        verbose_name=_('price'),
        max_digits=5,
        decimal_places=2,
    )
    active = models.BooleanField(
        verbose_name=_('active'),
        default=True,
    )
    category = models.ForeignKey(
        ProductCategory,
        verbose_name=_('category'),
        blank=True,
        null=True,
    )
    image = models.ImageField(
        verbose_name=_('image'),
        upload_to='products',
        blank=True,
        null=True,
    )
    image_thumbnail = models.ImageField(
        verbose_name=_('image'),
        upload_to='products_thumb',
        blank=True,
        null=True,
    )

    def __unicode__(self):
        return self.name

    class Meta:
        verbose_name = _('product')
        verbose_name_plural = _('products')


class ProductBarcode(models.Model):
    barcode = models.CharField(
        verbose_name=_('barcode'),
        max_length=32,
        unique=True,
    )
    comment = models.CharField(
        verbose_name=_('comment'),
        max_length=128,
        blank=True,
    )
    product = models.ForeignKey(
        Product,
        verbose_name=_('product'),
    )

    def __unicode__(self):
        return self.barcode

    class Meta:
        verbose_name = _('barcode')
        verbose_name_plural = _('barcodes')


class Transaction(models.Model):
    account = models.ForeignKey(
        Account,
        verbose_name=_('account'),
    )
    timestamp = models.DateTimeField(
        verbose_name=_('timestamp'),
        auto_now_add=True,
    )
    subject = models.CharField(
        verbose_name=_('subject'),
        max_length=32,
    )
    description = models.TextField(
        verbose_name=_('description'),
    )
    amount = models.DecimalField(
        verbose_name=_('amount'),
        max_digits=5,
        decimal_places=2,
    )

    class Meta:
        verbose_name = _('transaction')
        verbose_name_plural = _('transactions')


class SalesLogEntry(models.Model):
    account = models.ForeignKey(
        Account,
        verbose_name=_('account'),
    )
    product = models.ForeignKey(
        Product,
        verbose_name=_('product'),
    )
    count = models.IntegerField(
        verbose_name=_('count'),
    )
    unit_price = models.DecimalField(
        verbose_name=_('unit price'),
        max_digits=5,
        decimal_places=2,
    )
    timestamp = models.DateTimeField(
        verbose_name=_('timestamp'),
        auto_now_add=True,
    )

    def __unicode__(self):
        return '%dx %s - %s' % (self.count, self.product, self.account)

    class Meta:
        verbose_name = _('sales log entry')
        verbose_name_plural = _('sales log entries')