import copy

from datetime import datetime

from mandaye.backends.default import storage_conn
from mandaye.log import logger
from mandaye.models import IDPUser, SPUser, ServiceProvider

class Association(object):
    """
    association dictionnary return by the following methods:
    {
        'id': '', # identifier of your association (must be unique)
        'sp_name': '', # name of the service provider (defined in the mappers)
        'sp_login': '', # login on the service provider
        'sp_post_values': '', # the post values for sp login form
        'idp_unique_id:': '', # the unique identifier of the identity provider (ex.: a saml NameID)
        'idp_name':  '', # identity provide name
        'last_connection':  datetime.datetime, # last connection with this association
        'creation_date':  datetime.datetime, # creation date of this association
    }
    """

    @staticmethod
    def sp_user2association(sp_user):
        return {
                'id': sp_user.id,
                'sp_name': sp_user.service_provider.name,
                'sp_login': sp_user.login,
                'sp_post_values': sp_user.post_values,
                'idp_unique_id': sp_user.idp_user.unique_id,
                'idp_name': sp_user.idp_user.idp_id,
                'last_connection': sp_user.last_connection,
                'creation_date': sp_user.creation_date
                }


    @staticmethod
    def get(sp_name, idp_unique_id, idp_name='default'):
        """ return a list of dict with associations that matching all of this options """
        associations = []
        sp_users = storage_conn.query(SPUser).\
                join(IDPUser).\
                join(ServiceProvider).\
                filter(ServiceProvider.name==sp_name).\
                filter(IDPUser.unique_id==idp_unique_id).\
                filter(IDPUser.idp_id==idp_name).\
                all()
        for sp_user in sp_users:
            association = Association.sp_user2association(sp_user)
            associations.append(association)
        return associations

    @staticmethod
    def get_by_id(asso_id):
        """ return an dict of the association with the id or None if it doesn't exist """
        sp_user = storage_conn.query(SPUser).\
                filter(SPUser.id==asso_id).first()
        if sp_user:
            return Association.sp_user2association(sp_user)
        return None

    @staticmethod
    def has_id(asso_id):
        """ return a boolean """
        if storage_conn.query(SPUser).\
                filter(SPUser.id==asso_id).\
                count():
            return True
        return False

    @staticmethod
    def update_or_create(sp_name, sp_login, sp_post_values, idp_unique_id,
            idp_name='default', creation_date=None, last_connection_date=None):
        """ update or create an associtaion which match the following values
        return the association id
        """
        sp_user = storage_conn.query(SPUser).\
                join(IDPUser).\
                join(ServiceProvider).\
                filter(SPUser.login==sp_login).\
                filter(ServiceProvider.name==sp_name).\
                filter(IDPUser.unique_id==idp_unique_id).\
                filter(IDPUser.idp_id==idp_name).\
                first()
        if sp_user:
            sp_user.post_values = sp_post_values
            storage_conn.add(sp_user)
            logger.info('Modify association for %r (%r)', sp_login, idp_unique_id)
        else:
            service_provider = storage_conn.query(ServiceProvider).\
                    filter(ServiceProvider.name==sp_name).first()
            if not service_provider:
                logger.info('New service provider %r', sp_name)
                service_provider = ServiceProvider(name=sp_name)
                storage_conn.add(service_provider)
            idp_user = storage_conn.query(IDPUser).\
                    filter(IDPUser.unique_id==idp_unique_id).\
                    filter(IDPUser.idp_id==idp_name).\
                    first()
            if not idp_user:
                logger.info('New IDP user %r', idp_unique_id)
                idp_user = IDPUser(
                        unique_id=idp_unique_id,
                        idp_id=idp_name
                        )
                storage_conn.add(idp_user)
            creation_date = creation_date or datetime.utcnow()
            last_connection_date = last_connection_date or datetime.utcnow()
            sp_user = SPUser(
                    login=sp_login,
                    post_values=sp_post_values,
                    idp_user=idp_user,
                    service_provider=service_provider,
                    creation_date=creation_date,
                    last_connection=last_connection_date
                    )
            storage_conn.add(sp_user)
            try:
                storage_conn.commit()
            except:
                logger.error("update_or_create transaction failed so we rollback")
                storage_conn.rollback()
                raise
            logger.info('New association %r with %r', sp_login, idp_unique_id)
        return sp_user.id

    @staticmethod
    def delete(asso_id):
        """ delete the association which has the following asso_id """
        sp_user = storage_conn.query(SPUser).get(asso_id)
        if not sp_user:
            logger.warning("Association deletion failed: sp user %r doesn't exist", asso_id)
            return
        logger.info("Disassociate account %r (%r)", sp_user.login, sp_user.idp_user.unique_id)
        storage_conn.delete(sp_user)
        try:
            storage_conn.commit()
        except:
            logger.error("delete transaction failed so we rollback")
            storage_conn.rollback()
            raise

    @staticmethod
    def get_last_connected(sp_name, idp_unique_id, idp_name='default'):
        """ get the last connecting association which match the parameters
        return a dict of the association
        """
        sp_user = storage_conn.query(SPUser).\
                join(IDPUser).\
                join(ServiceProvider).\
                filter(ServiceProvider.name==sp_name).\
                filter(IDPUser.unique_id==idp_unique_id).\
                filter(IDPUser.idp_id==idp_name).\
                order_by(SPUser.last_connection.desc()).\
                first()
        if sp_user:
            return Association.sp_user2association(sp_user)
        else:
            return None

    @staticmethod
    def update_last_connection(asso_id):
        """ update the association last conenction time with the current time
        return None
        """
        sp_user = storage_conn.query(SPUser).get(asso_id)
        if not sp_user:
            logger.warning("Update last connecting failed: sp user %r doesn't exist", asso_id)
            return
        sp_user.last_connection = datetime.utcnow()
        storage_conn.add(sp_user)

    @staticmethod
    def has_sp_login(sp_login, sp_name):
        sp_user = storage_conn.query(SPUser).\
                join(ServiceProvider).\
                filter(ServiceProvider.name==sp_name).\
                filter(SPUser.login==sp_login).\
                count()
        if sp_user:
            return True
        return False