from __future__ import unicode_literals
import boto3

from moto import mock_autoscaling, mock_ec2,  mock_elbv2

@mock_elbv2
@mock_ec2
@mock_autoscaling
def test_attach_detach_target_groups():
    INSTANCE_COUNT = 2
    client = boto3.client('autoscaling', region_name='us-east-1')
    elbv2_client = boto3.client('elbv2', region_name='us-east-1')
    ec2 = boto3.resource('ec2', region_name='us-east-1')

    vpc = ec2.create_vpc(CidrBlock='172.28.7.0/24', InstanceTenancy='default')

    response = elbv2_client.create_target_group(
        Name='a-target',
        Protocol='HTTP',
        Port=8080,
        VpcId=vpc.id,
        HealthCheckProtocol='HTTP',
        HealthCheckPort='8080',
        HealthCheckPath='/',
        HealthCheckIntervalSeconds=5,
        HealthCheckTimeoutSeconds=5,
        HealthyThresholdCount=5,
        UnhealthyThresholdCount=2,
        Matcher={'HttpCode': '200'})
    target_group_arn = response['TargetGroups'][0]['TargetGroupArn']

    client.create_launch_configuration(
        LaunchConfigurationName='test_launch_configuration')

    # create asg, attach to target group on create
    client.create_auto_scaling_group(
        AutoScalingGroupName='test_asg',
        LaunchConfigurationName='test_launch_configuration',
        MinSize=0,
        MaxSize=INSTANCE_COUNT,
        DesiredCapacity=INSTANCE_COUNT,
        TargetGroupARNs=[target_group_arn],
        VPCZoneIdentifier=vpc.id)
    # create asg without attaching to target group
    client.create_auto_scaling_group(
        AutoScalingGroupName='test_asg2',
        LaunchConfigurationName='test_launch_configuration',
        MinSize=0,
        MaxSize=INSTANCE_COUNT,
        DesiredCapacity=INSTANCE_COUNT,
        VPCZoneIdentifier=vpc.id)

    response = client.describe_load_balancer_target_groups(
        AutoScalingGroupName='test_asg')
    list(response['LoadBalancerTargetGroups']).should.have.length_of(1)

    response = elbv2_client.describe_target_health(
        TargetGroupArn=target_group_arn)
    list(response['TargetHealthDescriptions']).should.have.length_of(INSTANCE_COUNT)

    client.attach_load_balancer_target_groups(
        AutoScalingGroupName='test_asg2',
        TargetGroupARNs=[target_group_arn])

    response = elbv2_client.describe_target_health(
        TargetGroupArn=target_group_arn)
    list(response['TargetHealthDescriptions']).should.have.length_of(INSTANCE_COUNT * 2)

    response = client.detach_load_balancer_target_groups(
        AutoScalingGroupName='test_asg2',
        TargetGroupARNs=[target_group_arn])
    response = elbv2_client.describe_target_health(
        TargetGroupArn=target_group_arn)
    list(response['TargetHealthDescriptions']).should.have.length_of(INSTANCE_COUNT)

@mock_elbv2
@mock_ec2
@mock_autoscaling
def test_detach_all_target_groups():
    INSTANCE_COUNT = 2
    client = boto3.client('autoscaling', region_name='us-east-1')
    elbv2_client = boto3.client('elbv2', region_name='us-east-1')
    ec2 = boto3.resource('ec2', region_name='us-east-1')

    vpc = ec2.create_vpc(CidrBlock='172.28.7.0/24', InstanceTenancy='default')

    response = elbv2_client.create_target_group(
        Name='a-target',
        Protocol='HTTP',
        Port=8080,
        VpcId=vpc.id,
        HealthCheckProtocol='HTTP',
        HealthCheckPort='8080',
        HealthCheckPath='/',
        HealthCheckIntervalSeconds=5,
        HealthCheckTimeoutSeconds=5,
        HealthyThresholdCount=5,
        UnhealthyThresholdCount=2,
        Matcher={'HttpCode': '200'})
    target_group_arn = response['TargetGroups'][0]['TargetGroupArn']

    client.create_launch_configuration(
        LaunchConfigurationName='test_launch_configuration')

    client.create_auto_scaling_group(
        AutoScalingGroupName='test_asg',
        LaunchConfigurationName='test_launch_configuration',
        MinSize=0,
        MaxSize=INSTANCE_COUNT,
        DesiredCapacity=INSTANCE_COUNT,
        TargetGroupARNs=[target_group_arn],
        VPCZoneIdentifier=vpc.id)

    response = client.describe_load_balancer_target_groups(
        AutoScalingGroupName='test_asg')
    list(response['LoadBalancerTargetGroups']).should.have.length_of(1)

    response = elbv2_client.describe_target_health(
        TargetGroupArn=target_group_arn)
    list(response['TargetHealthDescriptions']).should.have.length_of(INSTANCE_COUNT)

    response = client.detach_load_balancer_target_groups(
        AutoScalingGroupName='test_asg',
        TargetGroupARNs=[target_group_arn])

    response = elbv2_client.describe_target_health(
        TargetGroupArn=target_group_arn)
    list(response['TargetHealthDescriptions']).should.have.length_of(0)
    response = client.describe_load_balancer_target_groups(
        AutoScalingGroupName='test_asg')
    list(response['LoadBalancerTargetGroups']).should.have.length_of(0)