import os
import time

import MySQLdb
import psycopg2
import _mysql_exceptions
from wsgi import *

def create_dbs():
    deadline = time.time() + 60
    while time.time() < deadline:
        try:
            print("create_dbs: let's go.")
            django_settings = __import__(os.environ['DJANGO_SETTINGS_MODULE'], fromlist='DATABASES')
            print("create_dbs: got settings.")
            databases = django_settings.DATABASES
            for name, db in databases.iteritems():
                host = db['HOST']
                user = db['USER']
                password = db['PASSWORD']
                port = db['PORT']
                db_name = db['NAME']
                db_type = db['ENGINE']
                # see if it is mysql
                if db_type.endswith('mysql'):
                    print 'creating database %s on %s' % (db_name, host)
                    db = MySQLdb.connect(user=user,
                                         passwd=password,
                                         host=host,
                                         port=port)
                    cur = db.cursor()
                    print("Check if database is already there.")
                    cur.execute("""SELECT SCHEMA_NAME FROM INFORMATION_SCHEMA.SCHEMATA
                                 WHERE SCHEMA_NAME = %s""", (db_name,))
                    results = cur.fetchone()
                    if not results:
                        print("Database %s doesn't exist, lets create it." % db_name)
                        sql = """CREATE DATABASE IF NOT EXISTS %s """ % (db_name,)
                        print("> %s" % sql)
                        cur.execute(sql)
                        print(".....")
                    else:
                        print("database already exists, moving on to next step.")
                    exit(0)
                # see if it is postgresql
                elif db_type.endswith('postgresql_psycopg2'):
                    print 'creating database %s on %s' % (db_name, host)
                    con = psycopg2.connect(host=host, user=user, password=password, port=port, database='postgres')
                    con.set_isolation_level(0)
                    cur = con.cursor()
                    try:
                        cur.execute('CREATE DATABASE %s' % db_name)
                    except psycopg2.ProgrammingError as detail:
                        print detail
                        print 'moving right along...'
                    exit(0)
                else:
                    print("ERROR: {0} is not supported by this script, you will need to create your database by hand.".format(db_type))
                    exit(1)
        except psycopg2.OperationalError:
            print "Could not connect to database. Waiting a little bit."
            time.sleep(10)
        except _mysql_exceptions.OperationalError:
            print "Could not connect to database. Waiting a little bit."
            time.sleep(10)


    print 'Could not connect to database after 1 minutes. Something is wrong.'
    exit(1)

if __name__ == '__main__':
    import sys
    print("create_dbs start")
    create_dbs()
    print("create_dbs all done")