pipeline {
    agent any
    triggers {
        githubPush() // This will trigger the pipeline when a new commit is pushed to the 'main' branch.
    } 
    environment {
       // Define your AWS environment variables here
        AWS_REGION='eu-west-2'
        ECR_REPO_NAME='arsit-ecr-repo'
        EKS_CLUSTER_NAME='Arsit-Eks'
        
        //These variables are for your certificate request if your public dns is on Cloudflare
        CLOUDFLARE_API_KEY='writeyourowncloudflareapikey'
        CLOUDFLARE_EMAIL='write@youremail.com'
        DOMAINAME="'*.arsit.tech'"
        CERT_NAME='arsit-cert'
        CERT_SECRET_NAME='arsit-tls'
 
        // Define your image url and pubic port number according to your design
        image_name='write_yourown_image_url'
        public_port='80'
       
        // Define Docker image name and version
        DOCKERIMAGE_NAME='pythonapp'
        DOCKERIMAGE_TAG_VERSION='latest'
        DOCKERIMAGE_ID = ''

        // Write here your kubernetes cluster namespace for your deployment
        NAMESPACE="default"
        DEPLOYMENTREPLICA="2"
    }
    
    stages {
        stage('Checkout') {
            steps {
                script {
                    // Checkout the code from GitHub
                    checkout scmGit(branches: [[name: '*/main']], extensions: [], userRemoteConfigs: [[credentialsId: 'b66dea26-cddc-4ad5-bc33-15595ceebe9f', url: 'https://github.com/semiharsan/pythondemoapp.git']])
                }
            }
        }
        stage('Deploy Python Applicaton on EKS Cluster') {
            steps {
                script {
                    withCredentials([[
                    $class: 'AmazonWebServicesCredentialsBinding',
                    accessKeyVariable: 'AWS_ACCESS_KEY_ID',
                    secretKeyVariable: 'AWS_SECRET_ACCESS_KEY',
                    credentialsId: 'jenkins'
                    ]]) {
                        sh '''
                            
                            aws eks update-kubeconfig --region $AWS_REGION --name $EKS_CLUSTER_NAME
                            DEPLOYMENT_NAME=$(awk '/metadata:/ {f=1} f && /name:/ {print $2; exit}' awseks.yaml | tr -d '\r' 2>/dev/null)
                            PODS=$(kubectl get pods -n $NAMESPACE -l app=$DEPLOYMENT_NAME -o custom-columns=NAME:.metadata.name --no-headers)
                            if [ -z "$PODS" ]; then
                                echo "Deployment '$DEPLOYMENT_NAME' not found. Let us create it"
                                envsubst < cert-request-for-ekspod.yaml | kubectl apply -f -
                                envsubst < awseks.yaml | kubectl apply -f -
                                kubectl wait deployment/$DEPLOYMENT_NAME --for=condition=Available --timeout=120s
                                echo "Deployment '${DEPLOYMENT_NAME}' created."
                            else
                                echo "There is already pods with name $PODS let us update deployment"
                                NEW_REPLICA=$((DEPLOYMENTREPLICA + 1))
                                kubectl scale deployment/$DEPLOYMENT_NAME --replicas=$NEW_REPLICA
                                kubectl get pods
                                kubectl wait deployment/$DEPLOYMENT_NAME --for=condition=Available --timeout=120s
                                echo Deleting pods: $PODS
                                kubectl delete pod $PODS -n $NAMESPACE
                                kubectl scale deployment/$DEPLOYMENT_NAME --replicas=$DEPLOYMENTREPLICA
                                kubectl get pods
                            fi
                        '''
                    }
                }
            }
        }
    }
}