from django.db import models

book_fields = {'isbn' : 'ISBN', 'id' : 'Identifier', 'title' : 'Title',
'subtitle' : 'Subtitle', 'category' : 'Category', 'publisher':'Publisher',
'published_year':'Published year', 'edition' : 'Edition', 'num_pages' : 'Number of pages',
'series' : 'Series', 'description' : 'Description'}

class Category(models.Model):
	id = models.CharField(max_length=255, primary_key=True)
	name = models.CharField(max_length=255)

class BookSeries(models.Model):
	id = models.CharField(max_length=20, primary_key=True)
	title = models.CharField(max_length=511)

class ReferenceType(models.Model):
	name = models.CharField(max_length=31)

class Reference(models.Model):
	reference_type = models.ForeignKey(ReferenceType)
	text = models.CharField(max_length=1023)

class Book(models.Model):
	isbn = models.CharField(max_length=13, primary_key=True)
#	id = models.CharField(max_length=255)
	title = models.CharField(max_length=511)
	subtitle = models.CharField(max_length=511, null=True, blank=True)
	category = models.ForeignKey(Category, null=True, blank=True)
	publisher = models.CharField(max_length=255, null=True, blank=True)
	published_year = models.IntegerField(null=True, blank=True)
	edition = models.IntegerField(null=True, blank=True)
	num_pages = models.IntegerField(null=True, blank=True)
	series = models.ForeignKey(BookSeries, null=True, blank=True)
	description = models.CharField(max_length=1023, null=True, blank=True)
	picture = models.ImageField(upload_to='%Y/%m/%d/pictures', null=True, blank=True)
	thumbnail = models.ImageField(upload_to='%Y/%m/%d/thumbnails', null=True, blank=True)
	references = models.ManyToManyField(Reference, related_name='books')
	
	def full_print(self):
		for field in book_fields.items():
			try:
				print '%-15s: %50s' % (field[1],eval('self.'+field[0]))
			except Category.DoesNotExist:
				print '%-15s: %50s' % (field[1], 'Does not exist')

	def getid(self):
		try:
			return self.id.id
		except Id.DoesNotExist:
			return None

	def setid(self,newid):
		try:
			id = self.id
			id.delete()
			newid = Id(book=self,id=newid)
			newid.save()

		except Id.DoesNotExist:
			id=Id(id=newid,book=self)
			id.save()
#		return Book.get(isbn=self.isbn)

	def get_authors(self):
		people = self.person.all()
		authors = []
		for person in people:
			if person.relation.name == 'Author':
				authors.append(person.person)
		return authors

	def __unicode__(self):
		return self.title

#	def print(self):
#		print '%13s %5s %30s %'

#	class Meta:
#		unique_together=(("isbn","id"),)

class Id(models.Model):
	id = models.CharField(max_length=511, primary_key=True)
	book = models.OneToOneField(Book)

class AlternativeTitle(models.Model):
	book = models.ForeignKey(Book, related_name='alt_titles')
	alt_title = models.CharField(max_length=511)

class Copy(models.Model):
	book = models.ForeignKey(Book)
	number = models.IntegerField()
	owner = models.CharField(max_length=9)

class Person(models.Model):
	id = models.CharField(max_length=255, primary_key=True)
	first_name = models.CharField(max_length=255)
	last_name = models.CharField(max_length=255)
	references = models.ManyToManyField(Reference, related_name='persons', null=True, blank=True)

	def __unicode__(self):
		return self.first_name + u' ' + self.last_name

class Relation(models.Model):
	name = models.CharField(max_length=31)

	def __unicode__(self):
		return self.name

class BookPerson(models.Model):
	book = models.ForeignKey(Book, related_name='person')
	person = models.ForeignKey(Person, related_name='books')
	relation = models.ForeignKey(Relation)

	def __unicode__(self):
		return self.person.first_name +u' '+ self.person.last_name+ u' '+ self.relation.name+ u' of '+self.book.title

class Placement(models.Model):
	category = models.ForeignKey(Category)
	shelf = models.CharField(max_length=10)