pipeline {
    agent any

    environment {
        // INTERNAL K8S ADDRESS: <service-name>.<namespace>.svc.cluster.local
        // Assuming your harbor service is named 'harbor' in namespace 'harbor'
        REGISTRY = "harbor.harbor.svc.cluster.local" 
        
        APP_NAME = "ecommerce-app" 
        IMAGE_NAME = "ecommerce-backend"
        IMAGE_TAG = "${REGISTRY}/library/${IMAGE_NAME}:${env.BRANCH_NAME}-${env.BUILD_NUMBER}"
        NAMESPACE = "ecommerce"
        CONTAINERD_ADDR = "/run/containerd-pod/containerd.sock"
    }

    stages {
        stage('Initialize Environment') {
            steps {
                script {
                    // Install BuildKit binaries if missing
                    sh """
                    if ! command -v buildkitd >/dev/null; then
                        curl -L https://github.com/moby/buildkit/releases/download/v0.12.5/buildkit-v0.12.5.linux-amd64.tar.gz | tar -xz -C /usr/local/bin/ --strip-components=1
                    fi
                    ln -sf /usr/local/bin/buildctl /usr/bin/buildctl
                    """

                    // Start buildkitd
                    sh """
                    mkdir -p /run/buildkit /run/buildkit-default
                    if ! pgrep buildkitd > /dev/null; then
                        nohup buildkitd --addr unix:///run/buildkit/buildkitd.sock --addr unix:///run/buildkit-default/buildkitd.sock > /tmp/buildkitd.log 2>&1 &
                        sleep 10
                    fi
                    """
                }
            }
        }

        stage('Build & Push') {
            steps {
                script {
                    // Build using internal registry name
                    sh "nerdctl --address ${CONTAINERD_ADDR} build --insecure-registry -t ${IMAGE_TAG} ."
                    
                    withCredentials([usernamePassword(credentialsId: 'harbor-creds', passwordVariable: 'PASS', usernameVariable: 'USER')]) {
                        // Login and Push using internal K8s DNS
                        sh "echo '${PASS}' | nerdctl --address ${CONTAINERD_ADDR} login ${REGISTRY} -u ${USER} --password-stdin --insecure-registry"
                        sh "nerdctl --address ${CONTAINERD_ADDR} push ${IMAGE_TAG} --insecure-registry"
                    }
                }
            }
        }

        stage('Deploy') {
            steps {
                script {
                    withCredentials([file(credentialsId: 'k8s-config', variable: 'KUBECONFIG')]) {
                        sh "kubectl --kubeconfig=${KUBECONFIG} patch deployment ${APP_NAME} -n ${NAMESPACE} --patch '{\"spec\": {\"template\": {\"spec\": {\"containers\": [{\"name\": \"${APP_NAME}\", \"image\": \"${IMAGE_TAG}\", \"imagePullPolicy\": \"Never\"}]}}}}'"
                        sh "kubectl --kubeconfig=${KUBECONFIG} rollout status deployment/${APP_NAME} -n ${NAMESPACE}"
                    }
                }
            }
        }
    }
}