// ============================================
// AIOT Platform - Jenkins Pipeline
// 智能增量构建 + Docker 容器化部署
// ============================================

pipeline {
    agent any
    
    options {
        // 保留最近 10 次构建
        buildDiscarder(logRotator(numToKeepStr: '10'))
        // 禁止并发构建
        disableConcurrentBuilds()
        // 超时设置
        timeout(time: 60, unit: 'MINUTES')
    }
    
    environment {
        // Gitea 仓库配置
        GIT_REPO = 'http://124.221.55.225:3000/XW-AIOT/aiot-platform-cloud.git'
        
        // Docker Registry 配置
        REGISTRY = 'localhost:5000'
        
        // Maven 配置
        MAVEN_OPTS = '-Xmx2048m -Dmaven.repo.local=.m2/repository'
        
        // 镜像标签
        IMAGE_TAG = "${env.BRANCH_NAME}-${env.BUILD_NUMBER}-${env.GIT_COMMIT?.take(8)}"
        
        // 服务列表（核心服务）
        CORE_SERVICES = 'viewsh-gateway,viewsh-module-system-server,viewsh-module-infra-server,viewsh-module-iot-server,viewsh-module-iot-gateway,viewsh-module-ops-server'
    }
    
    stages {
        stage('Checkout') {
            steps {
                script {
                    echo "=== 检出代码 ==="
                    checkout scm
                    
                    // 获取 Git 提交信息
                    env.GIT_COMMIT_MSG = sh(
                        script: 'git log -1 --pretty=%B',
                        returnStdout: true
                    ).trim()
                    
                    echo "Commit: ${env.GIT_COMMIT}"
                    echo "Message: ${env.GIT_COMMIT_MSG}"
                }
            }
        }
        
        stage('Detect Changes') {
            steps {
                script {
                    echo "=== 检测变更的服务 ==="
                    
                    // 获取变更的文件列表
                    def changedFiles = sh(
                        script: '''
                            if [ "${GIT_PREVIOUS_COMMIT}" = "" ]; then
                                # 首次构建，构建所有核心服务
                                echo "all"
                            else
                                # 检测变更的文件
                                git diff --name-only ${GIT_PREVIOUS_COMMIT} ${GIT_COMMIT}
                            fi
                        ''',
                        returnStdout: true
                    ).trim()
                    
                    echo "Changed files:\n${changedFiles}"
                    
                    // 分析需要构建的服务
                    def servicesToBuild = []
                    
                    if (changedFiles == 'all') {
                        // 首次构建或强制全量构建
                        servicesToBuild = CORE_SERVICES.split(',')
                    } else {
                        // 检测每个服务是否有变更
                        CORE_SERVICES.split(',').each { service ->
                            def modulePath = service.replace('-server', '').replace('viewsh-module-', 'viewsh-module-').replace('viewsh-', '')
                            
                            if (changedFiles.contains(modulePath) || 
                                changedFiles.contains('pom.xml') || 
                                changedFiles.contains('viewsh-framework') ||
                                changedFiles.contains('viewsh-dependencies')) {
                                servicesToBuild.add(service)
                            }
                        }
                        
                        // 如果没有检测到变更，但有代码提交，构建所有服务
                        if (servicesToBuild.isEmpty() && !changedFiles.isEmpty()) {
                            servicesToBuild = CORE_SERVICES.split(',')
                        }
                    }
                    
                    env.SERVICES_TO_BUILD = servicesToBuild.join(',')
                    echo "Services to build: ${env.SERVICES_TO_BUILD}"
                    
                    if (servicesToBuild.isEmpty()) {
                        echo "No services need to be built. Skipping build."
                        currentBuild.result = 'SUCCESS'
                        return
                    }
                }
            }
        }
        
        stage('Maven Build') {
            when {
                expression { env.SERVICES_TO_BUILD != '' }
            }
            steps {
                script {
                    echo "=== Maven 构建 ==="
                    
                    def services = env.SERVICES_TO_BUILD.split(',')
                    
                    // 并行构建（最多 3 个并行，避免内存溢出）
                    def parallelBuilds = [:]
                    def batchSize = 3
                    
                    for (int i = 0; i < services.size(); i += batchSize) {
                        def batch = services[i..Math.min(i + batchSize - 1, services.size() - 1)]
                        
                        batch.each { service ->
                            def modulePath = getModulePath(service)
                            
                            parallelBuilds["Build ${service}"] = {
                                stage("Build ${service}") {
                                    echo "Building ${service}..."
                                    sh """
                                        mvn clean package -pl ${modulePath} -am -DskipTests -B
                                    """
                                }
                            }
                        }
                        
                        // 执行当前批次
                        parallel parallelBuilds
                        parallelBuilds = [:]
                    }
                }
            }
        }
        
        stage('Docker Build & Push') {
            when {
                expression { env.SERVICES_TO_BUILD != '' }
            }
            steps {
                script {
                    echo "=== Docker 镜像构建与推送 ==="
                    
                    def services = env.SERVICES_TO_BUILD.split(',')
                    def parallelBuilds = [:]
                    
                    services.each { service ->
                        parallelBuilds["Docker ${service}"] = {
                            stage("Docker ${service}") {
                                def modulePath = getModulePath(service)
                                def jarName = service
                                
                                echo "Building Docker image for ${service}..."
                                
                                sh """
                                    docker build \
                                        -f docker/Dockerfile.template \
                                        --build-arg MODULE_NAME=${modulePath} \
                                        --build-arg JAR_NAME=${jarName} \
                                        --build-arg SKIP_TESTS=true \
                                        -t ${REGISTRY}/${service}:${IMAGE_TAG} \
                                        -t ${REGISTRY}/${service}:latest \
                                        .
                                """
                                
                                echo "Pushing Docker image for ${service}..."
                                sh """
                                    docker push ${REGISTRY}/${service}:${IMAGE_TAG}
                                    docker push ${REGISTRY}/${service}:latest
                                """
                                
                                echo "Cleaning up old images for ${service}..."
                                sh """
                                    docker images ${REGISTRY}/${service} --format '{{.ID}} {{.Tag}}' | \
                                    grep -v '${IMAGE_TAG}' | grep -v 'latest' | \
                                    awk '{print \$1}' | head -n -2 | xargs -r docker rmi -f || true
                                """
                            }
                        }
                    }
                    
                    // 并行构建镜像（最多 3 个并行）
                    def batchSize = 3
                    for (int i = 0; i < services.size(); i += batchSize) {
                        def batch = services[i..Math.min(i + batchSize - 1, services.size() - 1)]
                        def batchBuilds = [:]
                        
                        batch.each { service ->
                            batchBuilds["Docker ${service}"] = parallelBuilds["Docker ${service}"]
                        }
                        
                        parallel batchBuilds
                    }
                }
            }
        }
        
        stage('Deploy') {
            when {
                expression { env.SERVICES_TO_BUILD != '' && env.BRANCH_NAME == 'master' }
            }
            steps {
                script {
                    echo "=== 部署到生产环境 ==="
                    
                    def services = env.SERVICES_TO_BUILD.split(',')
                    
                    services.each { service ->
                        echo "Deploying ${service}..."
                        
                        sh """
                            docker-compose -f docker-compose.core.yml pull ${service}
                            docker-compose -f docker-compose.core.yml up -d ${service}
                        """
                        
                        // 等待服务健康检查
                        echo "Waiting for ${service} to be healthy..."
                        sh """
                            timeout 120 sh -c 'until docker inspect --format="{{.State.Health.Status}}" aiot-${service} 2>/dev/null | grep -q healthy; do sleep 5; done' || true
                        """
                    }
                    
                    echo "Deployment completed!"
                }
            }
        }
    }
    
    post {
        success {
            echo "=== 构建成功 ==="
            echo "Built services: ${env.SERVICES_TO_BUILD}"
            echo "Image tag: ${IMAGE_TAG}"
        }
        
        failure {
            echo "=== 构建失败 ==="
            echo "Please check the logs for details."
        }
        
        always {
            // 清理工作空间（可选）
            // cleanWs()
            
            // 显示磁盘使用情况
            sh 'df -h'
            sh 'docker system df'
        }
    }
}

// ============================================
// 辅助函数
// ============================================

def getModulePath(String service) {
    // 根据服务名获取 Maven 模块路径
    def moduleMap = [
        'viewsh-gateway': 'viewsh-gateway',
        'viewsh-module-system-server': 'viewsh-module-system/viewsh-module-system-server',
        'viewsh-module-infra-server': 'viewsh-module-infra/viewsh-module-infra-server',
        'viewsh-module-iot-server': 'viewsh-module-iot/viewsh-module-iot-server',
        'viewsh-module-iot-gateway': 'viewsh-module-iot/viewsh-module-iot-gateway',
        'viewsh-module-ops-server': 'viewsh-module-ops/viewsh-module-ops-server'
    ]
    
    return moduleMap[service] ?: service
}