# Copyright (c) 2013 Franc Carter franc.carter@gmail.com
# All rights reserved.
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"""
Check that db_subnet_groups behave sanely
"""

import time
import unittest
import boto.rds
from boto.vpc import VPCConnection
from boto.rds import RDSConnection

def _is_ok(subnet_group, vpc_id, description, subnets):
    if subnet_group.vpc_id != vpc_id:
        print 'vpc_id is ',subnet_group.vpc_id, 'but should be ', vpc_id
        return 0
    if subnet_group.description != description:
        print "description is '"+subnet_group.description+"' but should be '"+description+"'"
        return 0
    if set(subnet_group.subnet_ids) != set(subnets):
        subnets_are = ','.join(subnet_group.subnet_ids)
        should_be   = ','.join(subnets)
        print "subnets are "+subnets_are+" but should be "+should_be
        return 0
    return 1


class DbSubnetGroupTest(unittest.TestCase):
    rds = True

    def test_db_subnet_group(self):
        vpc_api  = VPCConnection()
        rds_api  = RDSConnection()
        vpc      = vpc_api.create_vpc('10.0.0.0/16')

        az_list = vpc_api.get_all_zones(filters={'state':'available'})
        subnet = list()
        n      = 0;
        for az in az_list:
            try:
                subnet.append(vpc_api.create_subnet(vpc.id, '10.0.'+str(n)+'.0/24',availability_zone=az.name))
                n = n+1
            except:
                pass

        grp_name     = 'db_subnet_group'+str(int(time.time()))
        subnet_group = rds_api.create_db_subnet_group(grp_name, grp_name, [subnet[0].id,subnet[1].id])
        if not _is_ok(subnet_group, vpc.id, grp_name, [subnet[0].id,subnet[1].id]):
            raise Exception("create_db_subnet_group returned bad values")

        rds_api.modify_db_subnet_group(grp_name, description='new description')
        subnet_grps = rds_api.get_all_db_subnet_groups(name=grp_name)
        if not _is_ok(subnet_grps[0], vpc.id, 'new description', [subnet[0].id,subnet[1].id]):
            raise Exception("modifying the subnet group desciption returned bad values")

        rds_api.modify_db_subnet_group(grp_name, subnet_ids=[subnet[1].id,subnet[2].id])
        subnet_grps = rds_api.get_all_db_subnet_groups(name=grp_name)
        if not _is_ok(subnet_grps[0], vpc.id, 'new description', [subnet[1].id,subnet[2].id]):
            raise Exception("modifying the subnet group subnets returned bad values")

        rds_api.delete_db_subnet_group(subnet_group.name)
        try:
            rds_api.get_all_db_subnet_groups(name=grp_name)
            raise Exception(subnet_group.name+" still accessible after delete_db_subnet_group")
        except:
            pass
            
        while n > 0:
            n = n-1
            vpc_api.delete_subnet(subnet[n].id)
        vpc_api.delete_vpc(vpc.id)