pipeline {
  agent { 
    label 'docker' 
  }
  triggers { 
    pollSCM('H/5 * * * *') // every ~5 minutes
    cron('H 3 * * 0') // every week once
  } 
  
  // 👇 Fill these for your setup
  environment {
    GIT_URL         = '/var/git/git-server.git'
    GIT_BRANCH      = 'trunk'
    GIT_CREDENTIALS = ''                   // Jenkins credentialsId (leave empty for public)
    REGISTRY        = 'docker.it-jaros.com'        // e.g. ghcr.io/you or registry.example.com/namespace
    DOCKER_HUB      = 'jarlucmat/git-server'
    GROUP_ID        = 'com.it-jaros.git'
    IMAGE_NAME      = "${REGISTRY}/${GROUP_ID}"
    PLATFORMS       = 'linux/arm64/v8,linux/amd64'
    ALPINE_VERSION  = '3.20'
  }

  stages {
    stage('Checkout') {
      steps {
        script {
          if (env.GIT_CREDENTIALS?.trim()) {
            checkout([$class: 'GitSCM',
              branches: [[name: "*/${GIT_BRANCH}"]],
              userRemoteConfigs: [[url: GIT_URL, credentialsId: GIT_CREDENTIALS]],
	    ])
          } else {
            git branch: GIT_BRANCH, url: GIT_URL
          }
        }
      }
    }

    stage('Extract vars') {
      steps {
        script {
          env.GIT_SHA = sh(script: "git rev-parse --short HEAD", returnStdout: true).trim()
          env.APP_VERSION = sh(script: "cat src/version", returnStdout: true).trim()
        }
      }
    }

    stage('Docker buildx (multi-arch)') {
      steps {
        withCredentials([usernamePassword(
            credentialsId: 'docker',
            usernameVariable: 'DOCKER_USER',
            passwordVariable: 'DOCKER_PASS'
        )]) {
          sh '''
            docker version
            docker buildx version
            docker buildx ls | grep -q multiarch || docker buildx create --name multiarch --use --bootstrap
            echo "$DOCKER_PASS" | docker login $REGISTRY -u "$DOCKER_USER" --password-stdin
    
            DOCKER_BUILDKIT=1 docker buildx build \
              --platform ${PLATFORMS} \
	            --build-arg APP_VERSION=${APP_VERSION} \
	            --build-arg ALPINE_VERSION=${ALPINE_VERSION} \
              -t ${IMAGE_NAME}:${GIT_SHA} \
              -t ${DOCKER_HUB}:${GIT_SHA} \
              -t ${IMAGE_NAME}:${APP_VERSION} \
              -t ${DOCKER_HUB}:${APP_VERSION} \
              -t ${IMAGE_NAME}:${APP_VERSION}-alpine${ALPINE_VERSION} \
              -t ${DOCKER_HUB}:${APP_VERSION}-alpine${ALPINE_VERSION} \
              -t ${IMAGE_NAME}:latest \
              -t ${DOCKER_HUB}:latest \
	            --push \
              .
          '''
        }
      }
    }
  }
}