import pymysql
from . import Singleton
from geruecht.model.user import User
from geruecht.model.creditList import CreditList
from datetime import datetime

class DatabaseController(metaclass=Singleton):
    '''
    DatabaesController

    Connect to the Database and execute sql-executions
    '''

    def __init__(self, url='192.168.5.108', user='wu5', password='E1n$tein', database='geruecht'):
        self.url = url
        self.user = user
        self.password = password
        self.database = database
        self.connect()


    def connect(self):
        try:
            self.db = pymysql.connect(self.url, self.user, self.password, self.database, cursorclass=pymysql.cursors.DictCursor)
        except Exception as err:
            raise err

    def getAllUser(self):
        self.connect()
        cursor = self.db.cursor()
        try:
            cursor.execute("select * from user")
            data = cursor.fetchall()
            self.db.close()
        except Exception as err:
            raise err

        if data:
            retVal = []
            for value in data:
                user = User(value)
                creditLists = self.getCreditListFromUser(user)
                user.initGeruechte(creditLists)
                retVal.append(user)
            return retVal

    def getUser(self, username):
        self.connect()
        retVal = None
        cursor = self.db.cursor()
        try:
            cursor.execute("select * from user where uid='{}'".format(username))
            data = cursor.fetchone()
            self.db.close()
        except Exception as err:
            raise err
        if data:
            retVal = User(data)
            creditLists = self.getCreditListFromUser(retVal)
            retVal.initGeruechte(creditLists)

        return retVal

    def _convertGroupToString(self, groups):
        retVal = ''
        for group in groups:
            if len(retVal) != 0:
                retVal += ','
            retVal += group
        return retVal

    def insertUser(self, user):
        self.connect()
        cursor = self.db.cursor()
        groups = self._convertGroupToString(user.group)
        try:
            cursor.execute("insert into user (uid, dn, firstname, lastname, gruppe, limit, locked, autoLock) VALUES ('{}','{}','{}','{}','{}',{},{},{})".format(
                user.uid, user.dn, user.firstname, user.lastname, groups))
            self.db.commit()
        except Exception as err:
            self.db.rollback()
            self.db.close()
            raise err
        self.db.close()

    def updateUser(self, user):
        self.connect()
        cursor = self.db.cursor()
        groups = self._convertGroupToString(user.group)
        try:
            cursor.execute("update user set dn='{}', firstname='{}', lastname='{}', gruppe='{}, limit={}, locked={}, autoLock={}' where uid='{}'".format(
                user.dn, user.firstname, user.lastname, groups, user.limit, user.locked, user.autoLock, user.uid))
            self.db.commit()
        except Exception as err:
            self.db.rollback()
            self.db.close()
            print(err.__traceback__)
            raise err

        self.db.close()

    def getCreditListFromUser(self, user, **kwargs):
        self.connect()
        cursor = self.db.cursor()
        try:
            if 'year' in kwargs:
                sql = "select * from creditList where user_id={} and year_date={}".format(user.id, kwargs['year'])
            else:
                sql = "select * from creditList where user_id={}".format(user.id)
            cursor.execute(sql)
            data = cursor.fetchall()
            self.db.close()
        except Exception as err:
            self.db.close()
            raise err
        if len(data) == 1:
            return [CreditList(data[0])]
        else:
            return [CreditList(value) for value in data]

    def createCreditList(self, user_id, year=datetime.now().year):
        self.connect()
        cursor = self.db.cursor()
        try:
            cursor.execute("insert into creditList (year_date, user_id) values ({},{})".format(year, user_id))
            self.db.commit()
            self.db.close()
        except Exception as err:
            self.db.close()
            raise err

    def updateCreditList(self, creditlist):
        self.connect()
        cursor = self.db.cursor()
        try:
            cursor.execute("select * from creditList where user_id={} and year_date={}".format(creditlist.user_id, creditlist.year))
            data = cursor.fetchall()
            self.db.close()
            if len(data) == 0:
                self.createCreditList(creditlist.user_id, creditlist.year)
            sql = "update creditList set jan_guthaben={}, jan_schulden={},feb_guthaben={}, feb_schulden={}, maer_guthaben={}, maer_schulden={}, apr_guthaben={}, apr_schulden={}, mai_guthaben={}, mai_schulden={}, jun_guthaben={}, jun_schulden={}, jul_guthaben={}, jul_schulden={}, aug_guthaben={}, aug_schulden={},sep_guthaben={}, sep_schulden={},okt_guthaben={}, okt_schulden={}, nov_guthaben={}, nov_schulden={}, dez_guthaben={}, dez_schulden={}, last_schulden={} where year_date={} and user_id={}".format(creditlist.jan_guthaben, creditlist.jan_schulden,
                                                     creditlist.feb_guthaben, creditlist.feb_schulden,
                                                     creditlist.maer_guthaben, creditlist.maer_schulden,
                                                     creditlist.apr_guthaben, creditlist.apr_schulden,
                                                     creditlist.mai_guthaben, creditlist.mai_schulden,
                                                     creditlist.jun_guthaben, creditlist.jun_schulden,
                                                     creditlist.jul_guthaben, creditlist.jul_schulden,
                                                     creditlist.aug_guthaben, creditlist.aug_schulden,
                                                     creditlist.sep_guthaben, creditlist.sep_schulden,
                                                     creditlist.okt_guthaben, creditlist.okt_schulden,
                                                     creditlist.nov_guthaben, creditlist.nov_schulden,
                                                     creditlist.dez_guthaben, creditlist.dez_schulden,
                                                     creditlist.last_schulden, creditlist.year, creditlist.user_id)
            print(sql)
            self.connect()
            cursor = self.db.cursor()
            cursor.execute(sql)
            self.db.commit()
            self.db.close()
        except Exception as err:
            self.db.rollback()
            self.db.close()
            raise err


if __name__ == '__main__':
    db = DatabaseController()
    user = db.getUser('jhille')
    db.getCreditListFromUser(user, year=2018)