#!/usr/bin/python
# -*- coding: utf-8 -*-

import json
import logging
log = logging.getLogger(__name__)
import MySQLdb

class DB(object):

	def __init__(self,host,user,pwd,db):
		self.host = host
		self.user = user
		self.pwd  = pwd
		self.db   = db
		self.con  = 0

	def connect(self):
		if self.con == 0:
			try:
				con = MySQLdb.connect(self.host,self.user,self.pwd,self.db)
				self.con = con
				return True
			except Exception, e:
				log.fatal('Error connecting to database : %s' % e)
				return

	def do_sql(self,sql):
		try:
			c=self.con.cursor()
			c.execute(sql)
			self.con.commit()
			return c
		except Exception,e:
			log.error('Error executing request %s : %s' % (sql,e))
			return False

	def select(self,sql):
		ret=self.do_sql(sql)
		if ret!=False:
			return ret.fetchall()
		return ret

	def login(self,email,password):
		ret=self.select("SELECT email,name,password FROM users WHERE email='%s' AND password='%s'" % (email,password))
		log.debug(ret)
		if ret:
			if len(ret)==1:
				return {
					'email': ret[0][0],
					'name': ret[0][1]
				}
			elif len(ret)>=1:
				log.warning('Duplicate user %s in database' % email)
		elif ret==():
			return { 'loginerror': 'Utilisateur inconnu' }
		return { 'loginerror': 'Erreur inconnu' }

	def sync_group(self,email,groups):
		db_groups=self.get_group(email)
		json_group=json.dumps(groups)
		if db_groups!=False:
			if db_groups=={}:
				if groups=={}:
					return {'groups': {}}
				else:
					if self.do_sql("INSERT INTO groups (email,groups) VALUES ('%s','%s')" % (email,json_group)):
						return {'groups': groups}
			elif groups=={}:
				return {'groups': db_groups}
			else:
				if self.do_sql("UPDATE groups SET groups='%s' WHERE email='%s'" % (json_group,email)):
					return {'groups': groups}
		return {'syncerror': 'Erreur inconnu'}

	def get_group(self,email):
		ret=self.select("SELECT groups FROM groups WHERE email='%s'" % email)
		if ret!=False:
			if len(ret)==1:
				return json.loads(ret[0][0])
			else:
				return {}
		else:
			return False