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

import json
import logging
log = logging.getLogger(__name__)
import MySQLdb
from mycoserver import group

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
		else:
			try:
				self.con.ping(True)
			except Exception, e:
				self.con  = 0
				return self.connect()
			return True
				

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

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

	def login(self,email,password):
		if self.connect():
			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 subscribe(self,email,name,password):
		if self.connect():
			ret=self.select("SELECT count(*) as count FROM users WHERE email='%s'" % (email))
			log.debug(ret)
			if ret[0][0]!=0:
				return {'subscribeerror': u'Cette adresse mail est déjà associés a un compte !'}
			else:
				if self.do_sql("INSERT INTO users (email,name,password) VALUES ('%s','%s','%s')" % (email,name,password)):
					return {
						'email': email,
						'name': name,
						'password': password
					}
			return {'subscribeerror': u'Une erreur est survenue durant votre inscription :('}

	def sync_group(self,email,groups):
		if self.connect():
			db_groups=self.get_group(email)
			if db_groups!=False:
				db_grouplist=group.GroupList()
				db_grouplist.load(db_groups)
				grouplist=group.GroupList()
				grouplist.load(groups)
				synced_grouplist=db_grouplist.sync(grouplist)
				if self.set_group(email,synced_grouplist.export()):
					log.debug('Groups successfuly synchronized, return result')
					return {'groups': synced_grouplist.export()}
				else:
					return {'syncerror': 'Erreur en modifiant les informations de la base de donnees'}
			return {'syncerror': 'Erreur inconnu'}
		else:
			return {'syncerror': u"Erreur de connexion à la base de données"}

	def get_group(self,email):
		if self.connect():
			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 {'groups': {}}
			else:
				return False

	def set_group(self,email,groups):
		if self.connect():
			ret=self.select("SELECT groups FROM groups WHERE email='%s'" % email)
			if ret!=False:
				json_groups=json.dumps(groups)
				if len(ret)==1:
					return self.do_sql("UPDATE groups SET groups='%s' WHERE email='%s'" % (json_groups,email))
				else:
					return self.do_sql("INSERT INTO groups (email,groups) VALUES ('%s','%s')" % (email,json_groups))
			else:
				return False