# Python imports
import os

# Django imports
from django.db import models
from django.db.models.signals import pre_delete
from django.dispatch.dispatcher import receiver

class Document(models.Model):
    device_id = models.CharField(max_length=45)
    numberOfFile = models.IntegerField(db_column='number_of_file')  # Field name made lowercase.
    docfile = models.FileField(upload_to='files/')

    class Meta:
        unique_together = ('device_id', 'numberOfFile',)
        db_table = 'DeviceList_document'

    def filename(self):
        return os.path.basename(self.docfile.name)


class Download(models.Model):
    id = models.IntegerField(primary_key=True)  # Field name made lowercase.
    group = models.CharField(max_length=20)
    name = models.CharField(max_length=45)
    info = models.CharField(max_length=200)
    file = models.FileField(upload_to='downloads/files')
    icon = models.FileField(upload_to='downloads/icons')

    class Meta:
        db_table = 'LLDownloads'

    def filename(self):
        return os.path.basename(self.file.name)

    def iconname(self):
        return os.path.basename(self.icon.name)


@receiver(pre_delete, sender=Document)
def mymodel_delete(sender, instance, **kwargs):
    # Pass false so FileField doesn't save the model.
    instance.docfile.delete(False)


@receiver(pre_delete, sender=Download)
def mymodel_delete(sender, instance, **kwargs):
    # Pass false so FileField doesn't save the model.
    instance.file.delete(False)
    instance.icon.delete(False)