pipeline {
    agent any

    environment {
        // --- Harbor Configuration ---
        HARBOR_URL = 'harbor.example.com'
        HARBOR_PROJECT = 'my-todo-app'
        IMAGE_NAME = 'todo-backend'
        HARBOR_CREDS = 'harbor-credentials-id' 
        
        // --- Kubernetes Configuration ---
        K8S_CREDENTIALS_ID = 'k8s-kubeconfig' // Jenkins ID for kubeconfig file
        // ----------------------------
        
        IMAGE_TAG = "${env.BUILD_ID}"
        FULL_IMAGE_PATH = "${HARBOR_URL}/${HARBOR_PROJECT}/${IMAGE_NAME}:${IMAGE_TAG}"
    }

    stages {
        stage('Install & Test') {
            steps {
                sh 'npm install'
                sh 'npm test || true'
            }
        }

        stage('Build & Push to Harbor') {
            steps {
                script {
                    sh "docker build -t ${FULL_IMAGE_PATH} ."
                    withCredentials([usernamePassword(credentialsId: "${HARBOR_CREDS}", usernameVariable: 'USER', passwordVariable: 'PASS')]) {
                        sh "docker login ${HARBOR_URL} -u ${USER} -p ${PASS}"
                        sh "docker push ${FULL_IMAGE_PATH}"
                    }
                }
            }
        }

        stage('Deploy to Kubernetes') {
            steps {
                script {
                    // Assuming kubectl is available on the agent and configured
                    // or use withKubeConfig if plugin is available:
                    // configFileProvider([configFile(fileId: "${K8S_CREDENTIALS_ID}", variable: 'KUBECONFIG')]) {
                        
                        // 1. Replace placeholder in YAML with the actual image path
                        // We use a temporary file to avoid modifying the original repo file permanently in a way that breaks next builds
                        sh "sed 's|IMAGE_PATH_PLACEHOLDER|${FULL_IMAGE_PATH}|g' k8s-deployment.yaml > backend-k8s-applied.yaml"
                        
                        // 2. Apply the manifest
                        sh "kubectl apply -f backend-k8s-applied.yaml"
                        
                        // 3. Verify rollout
                        sh "kubectl rollout status deployment/todo-backend"
                    // }
                }
            }
        }
    }
    
    post {
        always {
            sh "docker logout ${HARBOR_URL}"
            sh "rm -f backend-k8s-applied.yaml"
        }
    }
}