import boto3
from botocore.exceptions import ClientError


################################################################################################
#
# Configuration Parameters
#
################################################################################################


region = 'eu-central-1'
availabilityZone = 'eu-central-1b'
vpc_id = 'vpc-eedd4187'
imageId = 'ami-0cc293023f983ed53'
instanceType = 't3.nano'
keyName = 'srieger-pub'

# if you only have one VPC, vpc_id can be retrieved using:
#
# response = ec2Client.describe_vpcs()
# vpc_id = response.get('Vpcs', [{}])[0].get('VpcId', '')


################################################################################################
#
# boto3 code
#
################################################################################################


client = boto3.setup_default_session(region_name=region)
ec2Client = boto3.client("ec2")
ec2Resource = boto3.resource('ec2')

elbv2Client = boto3.client('elbv2')

response = ec2Client.describe_security_groups(Filters=[{'Name': 'group-name', 'Values': ['tug-of-war']}])
security_group_id = response.get('SecurityGroups', [{}])[0].get('GroupId', '')

print("Getting DB IP...")
print("------------------------------------")

response = ec2Client.describe_instances(Filters=[{'Name': 'tag:tug-of-war', 'Values': ['db']}])
print(response)
reservations = response['Reservations']
for reservation in reservations:
    for instance in reservation['Instances']:
        if instance['State']['Name'] == "running" or instance['State']['Name'] == "pending":
            instanceDB = ec2Resource.Instance(instance['InstanceId'])
            privateIpDB = instanceDB.private_ip_address

userDataWebServer = ('#!/bin/bash\n'
                     '# extra repo for RedHat rpms\n'
                     'yum install -y https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm\n'
                     '# essential tools\n'
                     'yum install -y joe htop git\n'
                     '# mysql\n'
                     'yum install -y httpd php php-mysql\n'
                     '\n'
                     'service httpd start\n'
                     'service httpd start\n'
                     '\n'
                     # 'wget http://mmnet.informatik.hs-fulda.de/cloudcomp/tug-of-war-in-the-clouds.tar.gz\n'
                     # 'cp tug-of-war-in-the-clouds.tar.gz /var/www/html/\n'
                     # 'tar zxvf tug-of-war-in-the-clouds.tar.gz\n'
                     'cd /var/www/html\n'
                     'wget https://gogs.informatik.hs-fulda.de/srieger/cloud-computing-msc-ai-examples/raw/master/example-projects/tug-of-war-in-the-clouds/web-content/index.php\n'
                     'wget https://gogs.informatik.hs-fulda.de/srieger/cloud-computing-msc-ai-examples/raw/master/example-projects/tug-of-war-in-the-clouds/web-content/cloud.php\n'
                     'wget https://gogs.informatik.hs-fulda.de/srieger/cloud-computing-msc-ai-examples/raw/master/example-projects/tug-of-war-in-the-clouds/web-content/config.php\n'
                     '\n'
                     '# change hostname of db connection\n'
                     'sed -i s/localhost/' + privateIpDB + '/g /var/www/html/config.php\n'
                     )


for i in range(3, 4):
    print("Running new Web Server instance...")
    print("------------------------------------")

    response = ec2Client.run_instances(
        ImageId=imageId,
        InstanceType=instanceType,
        Placement={'AvailabilityZone': availabilityZone, },
        KeyName=keyName,
        MinCount=1,
        MaxCount=1,
        UserData=userDataWebServer,
        SecurityGroupIds=[
            security_group_id,
        ],

        TagSpecifications=[
            {
                'ResourceType': 'instance',
                'Tags': [
                    {'Key': 'Name', 'Value': 'tug-of-war-webserver' + str(i)},
                    {'Key': 'tug-of-war', 'Value': 'webserver'}
                ],
            }
        ],
    )

    instanceIdWeb = response['Instances'][0]['InstanceId']

    instance = ec2Resource.Instance(instanceIdWeb)
    instance.wait_until_running()
    instance.load()

    print("tug-of-war-in-the-clouds can be accessed at: " + instance.public_ip_address)

try:
    response = elbv2Client.describe_target_groups(Names=['tug-of-war-targetgroup'])
    targetgroup_arn = response.get('TargetGroups', [{}])[0].get('TargetGroupArn', '')
except ClientError as e:
    print(e)

print("Registering instance...")
print("------------------------------------")

response = elbv2Client.register_targets(
    TargetGroupArn=targetgroup_arn,
    Targets=[
        {
            'Id': instanceIdWeb,
        },
    ],
)