# -*- mode: python; coding: utf-8 -*- """printer.models Models of the printer application Author : Maxime Bombar . """ from __future__ import unicode_literals from numpy.random import randint import unidecode from django.core.files.storage import FileSystemStorage from django.core.exceptions import ObjectDoesNotExist from django.db import models from django.forms import ValidationError from django.utils.translation import ugettext_lazy as _ from django.template.defaultfilters import filesizeformat from re2o.mixins import RevMixin, AclMixin import users.models from .validators import ( FileValidator, ) from .settings import ( MAX_PRINTFILE_SIZE, ALLOWED_TYPES, PRICES, FORMAT_AVAILABLE, COLOR_CHOICES, DISPOSITIONS_AVAILABLE, STAPLING_OPTIONS, PERFORATION_OPTIONS, ) import math """ - ```user_printing_path``` is a function that returns the path of the uploaded file, used with the FileField. - ```Job``` is the main model of a printer job. His parent is the ```user``` model. """ def user_printing_path(instance, filename): """ Defines the path where will be uploaded the files """ # File will be uploaded to MEDIA_ROOT/printings/user_/ return 'printings/user_{0}/{1}'.format(instance.user.id, unidecode.unidecode(filename)) class Digicode(RevMixin, models.Model): """ This is a model to represent a digicode, maybe should be an external app. """ code = models.BigIntegerField(default=0, unique=True) user = models.ForeignKey('users.User', on_delete=models.PROTECT) created = models.DateTimeField(auto_now_add=True) used_time = models.DateTimeField(null=True) def _gen_code(user): try_again = True while try_again: try: code = randint(695895, 6958942)*1437+38 Digicode.objects.get(code=code) except ObjectDoesNotExist: try_again = False digicode = Digicode.objects.create(code=code, user=user) digicode.save() return (str(code) + '#') class PrintOperation(RevMixin, AclMixin, models.Model): """Abstract printing operation""" user = models.ForeignKey('users.User', on_delete=models.PROTECT) def can_edit(self, user_request, *args, **kwargs): if user_request.has_perm('printer.change_printoperation'): return True, None elif user_request == self.user: return True, None else: return False, _("This is not your print operation task") class JobWithOptions(RevMixin, AclMixin, models.Model): """ This is the main model of printer application : - ```user``` is a ForeignKey to the User Application - ```file``` is the file to print - ```filename``` is the name of the file to print - ```starttime``` is the time when the job was launched - ```endtime``` is the time when the job was stopped. A job is stopped when it is either finished or cancelled. - ```status``` can be running, finished or cancelled. - ```club``` is blank in general. If the job was launched as a club then it is the id of the club. - ```price``` is the total price of this printing. Printing Options : - ```format``` is the paper format. Example: A4. - ```color``` is the colorization option. Either Color or Greyscale. - ```disposition``` is the paper disposition. - ```count``` is the number of copies to be printed. - ```stapling``` is the stapling options. - ```perforations``` is the perforation options. Parent class : User Methods: ```_compute_price``` compute the printing price ```_update_price``` update printing price """ STATUS_AVAILABLE = ( ('Pending', _('Pending')), ('Printable', _('Printable')), ('Running', _('Running')), ('Cancelled', _('Cancelled')), ('Finished', _('Finished')) ) user = models.ForeignKey('users.User', on_delete=models.PROTECT) print_operation = models.ForeignKey('PrintOperation', on_delete=models.CASCADE) paid = models.BooleanField(default='False') file = models.FileField( storage=FileSystemStorage(location='/var/impressions'), upload_to=user_printing_path, validators=[FileValidator( allowed_types=ALLOWED_TYPES, max_size=MAX_PRINTFILE_SIZE) ], verbose_name=_('File') ) filename = models.CharField( max_length=255, null=True, verbose_name=_('File Name') ) starttime = models.DateTimeField(auto_now_add=True) endtime = models.DateTimeField(null=True) status = models.CharField( max_length=255, choices=STATUS_AVAILABLE, verbose_name=_('Status'), default='Pending' ) printAs = models.ForeignKey( 'users.User', on_delete=models.PROTECT, related_name='print_as_user', blank=True, null=True, verbose_name=_('Print as') ) price = models.DecimalField( max_digits=5, decimal_places=2, verbose_name=_("Price"), default=0.0 ) pages = models.IntegerField(default=0) format = models.CharField( max_length=255, choices=FORMAT_AVAILABLE, default='A4', verbose_name=_("Format") ) color = models.CharField( max_length=255, choices=COLOR_CHOICES, default='Greyscale', verbose_name=_("Color") ) disposition = models.CharField( max_length=255, choices=DISPOSITIONS_AVAILABLE, default='TwoSided', verbose_name=_("Disposition") ) count = models.PositiveIntegerField( default=1, verbose_name=_("Count") ) stapling = models.CharField( max_length=255, choices=STAPLING_OPTIONS, default='None', verbose_name=_("Stapling") ) perforation = models.CharField( max_length=255, choices=PERFORATION_OPTIONS, default='None', verbose_name=_("Perforation") ) def _update_price(self): self.price = self._compute_price() def _compute_price(self): pages = int(self.pages) price_paper = PRICES[self.format] price_stapling = 0.0 nb_staples = 0 if self.disposition == 'Booklet': sheets = int((pages+3)/4) pages = 2 * sheets elif self.disposition == 'TwoSided': sheets = int(pages/2.+0.5) else: sheets = pages if self.format == 'A3': pages*=2 price_ink = price_paper*sheets + PRICES[self.color]*pages if self.stapling: nb_staples = 2 - int('Top' in self.stapling) price_stapling = nb_staples * PRICES['Staples'] total_price = math.floor(self.count * (price_ink + price_stapling)) return total_price/100 def save(self, *args, **kwargs): self._update_price() super(JobWithOptions, self).save(*args, **kwargs)