def version = ""

pipeline {

    environment {
        registry = "hftstuttgart/dtt-backend"
        registryCredential = 'Dockerhub'
        dockerImage = ''
    }

    agent any

    tools {
        jdk 'Java11'
        maven 'Maven_Home'
    }

    stages {
        stage('prepare') {
            steps {
                checkout ([
                    $class: 'GitSCM',
                    branches: scm.branches,
                    extensions: scm.extensions + [[$class: 'CloneOption', noTags: false, reference: '', shallow: false]],
                    userRemoteConfigs: scm.userRemoteConfigs
                ])
                script {
                    version = sh(script: 'git describe --tags --always', returnStdout: true).trim()
                    echo sh(script: 'env|sort', returnStdout: true)
                }

            }
        }

        stage('compile') {
            steps {
                sh "BUILD_NUMBER=${version} mvn clean package"
            }
        }

        stage('build Docker image') {
            steps {
                script {
                    dockerImage = docker.build registry
                }
            }
        }

        stage('push development image') {
            steps {
                script {
                    docker.withRegistry( '', registryCredential ) {
                        dockerImage.push("${env.GIT_BRANCH}")
                    }
                }
            }
        }

        stage('release') {
            when {
                expression { version ==~ /[0-9]+.[0-9]+.[0-9]+/ }
            }
            steps {
                script {
                    docker.withRegistry( '', registryCredential ) {
                        dockerImage.push("latest")
                        dockerImage.push("${version}")
                    }
                }
            }
        }
    }
}