// Basic Pipeline

def clusterCredsID = env.CLUSTER_CREDENTIALS ?: "cluster-creds"

pipeline {
    environment {
         REGISTRY_URL = "us.icr.io"
         MAJOR_PREFIX = "1.0.0"
         RELEASE_NAME = "pbw-liberty-mariadb"
         DEPLOYMENT_NS = "default"
    }

    tools {
        maven 'Apache Maven 3.5.2'
        jdk 'Open JDK 8'
    }

    agent any

    stages {
         stage ('Initialize') {
            steps {
                sh '''#!/bin/bash
                 if [ -z "${CLUSTER_NAME}"  ]; then
                    echo "FATAL ERROR: CLUSTER_NAME undefined, exiting pipeline"
                    exit 22
                 else 
                    echo "CLUSTER_NAME set to ${CLUSTER_NAME}"
                 fi
                 if [ -z "${REGISTRY_NS}"  ]; then
                    echo "FATAL ERROR: REGISTRY_NS undefined, exiting pipeline"
                    exit 22
                 else 
                    echo "REGISTRY_NS set to ${REGISTRY_NS}"
                 fi
                 if [ -z "${REGION}"  ]; then
                    echo "FATAL ERROR: REGION undefined, exiting pipeline"
                    exit 22
                 else 
                    echo "REGION set to ${REGION}"
                 fi
                 if [ -z "${RESOURCE_GROUP}"  ]; then
                    echo "FATAL ERROR: RESOURCE_GROUP undefined, exiting pipeline"
                    exit 22
                 else 
                    echo "RESOURCE_GROUP set to ${RESOURCE_GROUP}"
                 fi
              
                 if [ -z "${DEPLOYMENT_NS}"  ]; then
                    echo "FATAL ERROR: DEPLOYMENT_NS undefined, exiting pipeline"
                    exit 22
                 else 
                    echo "DEPLOYMENT_NS set to ${DEPLOYMENT_NS}"
                 fi
                
                 if [ -z "${RELEASE_NAME}"  ]; then
                    echo "FATAL ERROR: RELEASE_NAME undefined, exiting pipeline"
                    exit 22
                 else 
                    echo "RELEASE_NAME set to ${RELEASE_NAME}"
                 fi
                
                 if [ -z "${REGISTRY_NS}"  ]; then
                    echo "FATAL ERROR: REGISTRY_NS undefined, exiting pipeline"
                    exit 22
                 else 
                    echo "REGISTRY_NS set to ${REGISTRY_NS}"
                 fi
                '''
            }
         }

        stage('Build application ear file') {
          steps {
              checkout scm
              sh 'mvn clean package'
          }
        }

       stage('Build Docker Image') {
            steps {
                script {
                   echo "docker build -t ${REGISTRY_URL}/${REGISTRY_NS}/pbw-mariadb-web:${MAJOR_PREFIX}.${BUILD_NUMBER} ."
                   sh 'docker build -t ${REGISTRY_URL}/${REGISTRY_NS}/pbw-mariadb-web:${MAJOR_PREFIX}.${BUILD_NUMBER} .'
                }

            }
       }

       stage('Push Docker Image to Registry') {
          steps {
             withCredentials([usernamePassword(credentialsId: clusterCredsID,
                                          usernameVariable: 'USERNAME',
                                          passwordVariable: 'PASSWORD')]) {
                 sh """#!/bin/bash
                 docker login -u ${USERNAME} -p ${PASSWORD} ${env.REGISTRY_URL}
                 docker push ${env.REGISTRY_URL}/${env.REGISTRY_NS}/pbw-mariadb-web:${env.MAJOR_PREFIX}.${env.BUILD_NUMBER}
                 """
             }
           }
       }

        stage('Deploy new Docker Image') {
            steps {
                echo 'Deploying....'
                withCredentials([usernamePassword(credentialsId: clusterCredsID,
                                             usernameVariable: 'USERNAME',
                                             passwordVariable: 'PASSWORD')]) {
                    sh """#!/bin/bash
                    ibmcloud login --apikey ${PASSWORD} -r ${env.REGION} -g ${env.RESOURCE_GROUP}
                    eval \$(ibmcloud ks cluster-config --cluster ${env.CLUSTER_NAME} --export)
                    DEPLOYMENT=`kubectl --namespace=${env.DEPLOYMENT_NS} get deployments -l app=pbw-liberty-mariadb,component=web-app,release=${env.RELEASE_NAME} --no-headers  -o name`
                    if [ -z "\$DEPLOYMENT"  ]; then
                       echo "FATAL ERROR: Deployment not found, exiting pipeline"
                       exit 22
                    else
                       echo "Existing deployment found, uodating to point to image just created "
                    fi
                    kubectl --namespace=${env.DEPLOYMENT_NS} get \${DEPLOYMENT} --no-headers -o custom-columns=":metadata.name"
            
                    # Update Deployment
                    kubectl --namespace=${env.DEPLOYMENT_NS} set image \${DEPLOYMENT} ${env.RELEASE_NAME}-liberty=${env.REGISTRY_URL}/${env.REGISTRY_NS}/pbw-mariadb-web:${env.MAJOR_PREFIX}.${env.BUILD_NUMBER}
                    kubectl --namespace=${env.DEPLOYMENT_NS} rollout status \${DEPLOYMENT}
                    """
                }

            }
        }
    }
}