def label = "worker-${UUID.randomUUID().toString()}"

podTemplate(
    label: label,
    containers: [
        containerTemplate(
            name: 'gradle', 
            image: 'gradle:7.6.0-jdk11', 
            command: 'sleep', 
            args: '30d'
        ),
        containerTemplate(
            name: 'docker', 
            image: 'docker:latest', 
            command: 'cat', 
            ttyEnabled: true
        ),
        containerTemplate(
            name: 'kubectl', 
            image: 'bitnami/kubectl:latest', 
            command: 'cat', 
            ttyEnabled: true
        ),
        containerTemplate(
            name: 'helm', 
            image: 'alpine/helm:latest', 
            command: 'cat', 
            ttyEnabled: true
        )
    ],
    volumes: [
        hostPathVolume(mountPath: '/home/gradle/.gradle', hostPath: '/tmp/jenkins/.gradle'),
        hostPathVolume(mountPath: '/var/run/docker.sock', hostPath: '/var/run/docker.sock')
    ]
)

{
    node(label) {
        def myRepo = checkout scm
        def gitCommit = myRepo.GIT_COMMIT
        def gitBranch = myRepo.GIT_BRANCH
        def shortGitCommit = "${gitCommit[0..10]}"
        def previousGitCommit = sh(script: "git rev-parse ${gitCommit}~", returnStdout: true)
        def dockerRegistryUrl = "harbor.loafle.net"

        stage('Test') {
            try {
                container('gradle') {
                    def projectName = sh(returnStdout: true, script: "gradle -q projectName").trim()
                    def projectVersion = sh(returnStdout: true, script: "gradle -q projectVersion").trim()
                    env.PROJECT_NAME = projectName
                    env.PROJECT_VERSION = projectVersion
                    
                    sh """
                        pwd
                        echo "GIT_BRANCH=${gitBranch}" >> /etc/environment
                        echo "GIT_COMMIT=${gitCommit}" >> /etc/environment
                        gradle test
                        """
                }
            }
            catch (exc) {
                println "Failed to test - ${currentBuild.fullDisplayName}"
                throw(exc)
            }
        }

        stage('Build') {
            container('gradle') {
                sh "gradle build"
            }
        }

        stage('Create Docker images') {
            container('docker') {
                withCredentials([[$class: 'UsernamePasswordMultiBinding',
                credentialsId: 'harbor.loafle.net',
                usernameVariable: 'HARBOR_USER',
                passwordVariable: 'HARBOR_PASSWORD']]) {
                env.CONTAINER_IMAGE_NAME = "prototype/${env.PROJECT_NAME}"
                sh """
                    docker login -u "${HARBOR_USER}" -p "${HARBOR_PASSWORD}" ${dockerRegistryUrl}
                    docker build -t ${dockerRegistryUrl}/${env.CONTAINER_IMAGE_NAME}:${env.PROJECT_VERSION} --build-arg PROJECT_NAME=${env.PROJECT_NAME} --build-arg PROJECT_VERSION=${env.PROJECT_VERSION} .
                    docker push ${dockerRegistryUrl}/${env.CONTAINER_IMAGE_NAME}:${env.PROJECT_VERSION}
                    """
                }
            }
        }

        stage('Deploy Application on K8s') {
            container('kubectl') {
                withKubeConfig([
                credentialsId: 'microk8s-cluster',
                serverUrl: env.K8s_SERVER_URL,
                contextName: env.K8s_CONTEXT_NAME,
                clusterName: env.K8s_CLUSTER_NAME]) {
                sh """
                    DEPLOY_DATE=$(date +"%Y-%m-%d %H:%M:%S")
                    sed -i -e 's*__REGISTRY_URL__*${dockerRegistryUrl}*g' ./.k8s/deployment.yaml
                    """
                }     
            }
    }
    }
}