from datetime import datetime
from auth import model
from sqlalchemy import text
from sqlalchemy.exc import OperationalError
from datetime import datetime
from db import dbauth

session = dbauth.session
BINDKEY = "auth"

def _db_V01_00():
    # "bind_key=None" bedeutet hier, dass bei "create_all" nur die Models mit
    # Default-Bind erzeugt werden sollen und nicht die anderen, insbesonder
    # nicht die zum MS-SQL-SErver
    dbauth.create_all(bind_key=BINDKEY)
    systeminfo = model.Systeminfo()
    systeminfo.id = 1
    systeminfo.version = "01.00"
    systeminfo.lastupdate = datetime.now()
    systeminfo.initialinstall = datetime.now()
    session.add(systeminfo)
    session.commit()

def _db_V01_01():
    u = model.User()
    u.id = 1
    u.userid = 'System.Admin'
    u.username = 'Systemadministrator'
    u.password = "geheim"
    u.email = ''
    session.add(u)

    sysmgr = model.Role()
    sysmgr.id = 1
    sysmgr.name = "Systemadministrator"
    sysmgr.roleid = "SysAdmin"
    session.add(sysmgr)

    appmgr = model.Role()
    appmgr.name = "Anwendungsadministrator"
    appmgr.roleid = "AppAdmin"
    session.add(appmgr)

    usermgr = model.Role()
    usermgr.name = "Benutzerverwaltung"
    usermgr.roleid = "UserMgr"
    session.add(usermgr)

    application = model.Application()
    application.id = 1
    application.appid = "Project01"
    application.name = "Project01 (Name ändern)"
    session.add(application)

    userapp = model.Userapp()
    userapp.application = application
    userapp.userapp_roles.append(sysmgr)
    session.add(userapp)
    u.userapps.append(userapp)

    _updatesysteminfo('01.01')
    session.commit()

def _updatesysteminfo(versionnr):
    s: model.Systeminfo = model.Systeminfo.query.get(1)
    s.version = versionnr
    s.lastupdate = datetime.now()
    return

def checkupdates():
    systeminfo = None
    curr_dbversion = '_db_V01_00'
    try:
        systeminfo: model.Systeminfo = model.Systeminfo.query.get(1)
        curr_dbversion = "_db_V" + systeminfo.version.replace(".", "_")
    except (OperationalError, AttributeError):
        _db_V01_00()

    versionen = sorted(filter(lambda f: f.startswith("_db_V"),globals()))
    
    for v in versionen:
        if v > curr_dbversion:
            globals()[v]() # https://docs.python.org/3.6/library/functions.html?highlight=globals#globals
    
    print('########## Database updated')