/**
 * OfferPie Web 前端蓝绿部署流水线
 *
 * 架构：Jenkins 本地编译 → scp 镜像到目标机 → SSH 远程蓝绿切换
 * 目标机目录：/opt/offerpie/web/
 *
 * 内层 Nginx 职责：
 * - 蓝绿切换（前端静态文件 serve）
 * - /api/ 代理到 Java 后端（10202）
 * - /ai-api/ 代理到 Python AI（10502），rewrite 去掉前缀
 */
pipeline {
    agent any

    parameters {
        choice(name: 'BRANCH', choices: ['master', 'pre', 'dev', 'test'], description: '选择要部署的分支')
    }

    environment {
        // 目标服务器配置
        DEPLOY_HOST = '8.138.180.255'
        DEPLOY_PORT = '22'
        DEPLOY_USER = 'root'
        DEPLOY_PASS = 'sh.0807.'

        // 项目配置
        IMAGE_NAME = 'offerpie-web'
        IMAGE_TAG = 'latest'
        CONTAINER_PREFIX = 'offerpie-web'
        REMOTE_DIR = '/opt/offerpie/web'
        HEALTH_URL = 'http://localhost:80/'

        // SSH 命令前缀
        SSH_CMD = "sshpass -p '${DEPLOY_PASS}' ssh -o StrictHostKeyChecking=no -p ${DEPLOY_PORT} ${DEPLOY_USER}@${DEPLOY_HOST}"
        SCP_CMD = "sshpass -p '${DEPLOY_PASS}' scp -o StrictHostKeyChecking=no -P ${DEPLOY_PORT}"
    }

    stages {
        stage('环境检查') {
            steps {
                sh 'sshpass -V'
            }
        }

        stage('拉取代码') {
            steps {
                echo "拉取 ${params.BRANCH} 分支代码"
                git branch: "${params.BRANCH}",
                    credentialsId: 'gitea-fab089c1-b55d-4b58-9fad',
                    url: 'http://git.jianshixingqiu.com/offerpai/offerpai_web.git'
            }
        }

        stage('本地编译') {
            steps {
                echo "开始构建镜像"
                sh "docker build -t ${IMAGE_NAME}:${IMAGE_TAG} ."
                echo "导出镜像"
                sh "docker save -o ${IMAGE_NAME}.tar ${IMAGE_NAME}:${IMAGE_TAG}"
            }
        }

        stage('文件传输') {
            steps {
                echo "传输文件到目标服务器"
                sh "${SSH_CMD} 'mkdir -p ${REMOTE_DIR}'"
                sh "${SCP_CMD} ${IMAGE_NAME}.tar ${DEPLOY_USER}@${DEPLOY_HOST}:${REMOTE_DIR}/"
                sh "${SCP_CMD} proxy_nginx.conf ${DEPLOY_USER}@${DEPLOY_HOST}:${REMOTE_DIR}/proxy_nginx.conf"
                sh "${SCP_CMD} docker-compose.yml ${DEPLOY_USER}@${DEPLOY_HOST}:${REMOTE_DIR}/docker-compose.yml"
            }
        }

        stage('加载镜像') {
            steps {
                sh "${SSH_CMD} 'docker load < ${REMOTE_DIR}/${IMAGE_NAME}.tar'"
            }
        }

        stage('检测部署目标') {
            steps {
                script {
                    def blueRunning = sh(script: "${SSH_CMD} 'docker ps -q -f name=${CONTAINER_PREFIX}-blue'", returnStdout: true).trim()
                    def greenRunning = sh(script: "${SSH_CMD} 'docker ps -q -f name=${CONTAINER_PREFIX}-green'", returnStdout: true).trim()

                    env.DEPLOY_TARGET = ''

                    if (blueRunning && !greenRunning) {
                        env.DEPLOY_TARGET = 'green'
                    }
                    if (greenRunning && !blueRunning) {
                        env.DEPLOY_TARGET = 'blue'
                    }
                    if (!env.DEPLOY_TARGET) {
                        echo "当前环境未部署服务或状态异常，默认部署 blue"
                        env.DEPLOY_TARGET = 'blue'
                    }

                    env.OTHER_TARGET = (env.DEPLOY_TARGET == 'blue') ? 'green' : 'blue'
                    echo "当前激活: ${env.OTHER_TARGET}，即将部署: ${env.DEPLOY_TARGET}"
                }
            }
        }

        stage('启动新版本') {
            steps {
                script {
                    def existingContainer = sh(script: "${SSH_CMD} 'docker ps -aq -f name=${CONTAINER_PREFIX}-${env.DEPLOY_TARGET}'", returnStdout: true).trim()
                    if (existingContainer) {
                        sh "${SSH_CMD} 'docker rm -f ${CONTAINER_PREFIX}-${env.DEPLOY_TARGET}'"
                    }
                    sh "${SSH_CMD} 'cd ${REMOTE_DIR} && docker compose up -d ${env.DEPLOY_TARGET}'"
                    sh 'sleep 5'
                }
            }
        }

        stage('检查Nginx') {
            steps {
                script {
                    def nginxExists = sh(script: "${SSH_CMD} 'docker ps -aq -f name=${CONTAINER_PREFIX}-nginx'", returnStdout: true).trim()
                    if (!nginxExists) {
                        echo "首次部署，初始化 Nginx 容器"
                        sh "${SSH_CMD} 'cd ${REMOTE_DIR} && docker compose up -d nginx'"
                        sh 'sleep 3'
                    } else {
                        def nginxRunning = sh(script: "${SSH_CMD} 'docker ps -q -f name=${CONTAINER_PREFIX}-nginx'", returnStdout: true).trim()
                        if (!nginxRunning) {
                            echo "Nginx 容器已停止，重新启动"
                            sh "${SSH_CMD} 'docker start ${CONTAINER_PREFIX}-nginx'"
                            sh 'sleep 2'
                        }
                        echo "Nginx 容器已存在且运行中"
                    }
                }
            }
        }

        stage('健康检查') {
            steps {
                script {
                    def maxRetries = 3
                    def retryCount = 0
                    def healthy = false

                    while (retryCount < maxRetries && !healthy) {
                        try {
                            sh "${SSH_CMD} 'docker exec ${CONTAINER_PREFIX}-${env.DEPLOY_TARGET} curl -f ${HEALTH_URL}'"
                            healthy = true
                        } catch (Exception e) {
                            retryCount++
                            if (retryCount < maxRetries) {
                                echo "健康检查失败，5秒后重试 (${retryCount}/${maxRetries})"
                                sleep 5
                            }
                        }
                    }

                    if (!healthy) {
                        error "健康检查失败，部署中止"
                    }
                    echo "✅ ${CONTAINER_PREFIX}-${env.DEPLOY_TARGET} 健康检查通过"
                }
            }
        }

        stage('切换流量') {
            steps {
                script {
                    sh "${SSH_CMD} \"sed -i 's/proxy_pass http:\\/\\/\\(blue\\|green\\);/proxy_pass http:\\/\\/${env.DEPLOY_TARGET};/' ${REMOTE_DIR}/proxy_nginx.conf\""
                    sh "${SSH_CMD} 'docker exec ${CONTAINER_PREFIX}-nginx nginx -s reload'"
                    echo "✅ 流量已切换到 ${env.DEPLOY_TARGET}"
                }
            }
        }

        stage('删除旧版本') {
            steps {
                script {
                    def otherExists = sh(script: "${SSH_CMD} 'docker ps -aq -f name=${CONTAINER_PREFIX}-${env.OTHER_TARGET}'", returnStdout: true).trim()
                    if (otherExists) {
                        sh "${SSH_CMD} 'docker rm -f ${CONTAINER_PREFIX}-${env.OTHER_TARGET}'"
                        echo "旧版本 ${env.OTHER_TARGET} 已删除"
                    }
                }
            }
        }

        stage('清理') {
            steps {
                sh "${SSH_CMD} 'rm -f ${REMOTE_DIR}/${IMAGE_NAME}.tar'"
                sh "rm -f ${IMAGE_NAME}.tar"
            }
        }
    }

    post {
        success {
            echo "✅ 蓝绿部署成功！当前运行: ${env.DEPLOY_TARGET}"
        }
        failure {
            echo '❌ 部署失败，请检查日志'
            sh "rm -f ${IMAGE_NAME}.tar || true"
        }
    }
}