from sqlalchemy import create_engine, Column, Integer, String, DateTime, Text, Index, ForeignKey
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker, relation, backref
from sqlalchemy.orm.exc import NoResultFound
from sqlalchemy.exc import IntegrityError
from sqlalchemy.sql import and_
import settings

engine = create_engine(settings.db_path)

Base = declarative_base(bind = engine)

class User(Base):
	__tablename__ = 'users'

	id = Column(Integer, primary_key = True)
	username = Column(String, unique = True, index = True)
	password = Column(String)
	files = relation('File', backref = 'user', order_by = 'File.date.desc()')

	def __init__(self, username, password):
		self.username = username
		self.password = password

class File(Base):
	__tablename__ = 'files'

	id = Column(Integer, primary_key = True)
	hash = Column(String, unique = True, index = True)
	file_hash = Column(String, unique = True, index = True)
	filename = Column(String)
	date = Column(DateTime)
	user_id = Column(Integer, ForeignKey('users.id'), nullable = True)

	def __init__(self, hash, file_hash, filename, date, user_id = None):
		self.hash = hash
		self.file_hash = file_hash
		self.filename = filename
		self.date = date
		self.user_id = user_id

	def html(self):
		return '<a href="/f/{hash}/{filename}">{filename}</a> on {date}'.format(
			hash = self.hash, filename = self.filename, date = self.date.strftime('%Y-%m-%d %H:%M:%S UTC'))

Base.metadata.create_all()
Session = sessionmaker(bind = engine, autoflush = True, autocommit = False)