#!/bin/bash
set -euo pipefail

# Containerd安装脚本（已删除镜像加速配置）
# 保留核心功能：生成默认配置、替换华为云镜像源、配置Cgroup驱动、服务管理
# 适用： Ubuntu 20.04/22.04/24.04 LTS（需确保系统已有containerd.io安装源）

#######################################
# 配置参数（删除镜像加速相关路径）
#######################################
DEFAULT_VERSION="1.7.28-1"
ACTION=""
CONTAINERD_VERSION="$DEFAULT_VERSION"
LOG_FILE="/var/log/containerd_manage.log"
CONFIG_PATH="/etc/containerd/config.toml"
PACKAGE_NAME="containerd.io"

#######################################
# 日志函数
#######################################
log() {
    local level=$1
    local message=$2
    local timestamp=$(date +"%Y-%m-%d %H:%M:%S")
    echo "[$timestamp] [$level] $message" | tee -a "$LOG_FILE"
}

#######################################
# 帮助信息
#######################################
usage() {
    echo "Usage: $0 [OPTIONS]"
    echo "Options:"
    echo "  --install          安装containerd（必填）"
    echo "  --uninstall        卸载containerd（必填）"
    echo "  --version VERSION  指定版本（如1.7.28-1，默认：$DEFAULT_VERSION）"
    echo "  --help             显示帮助"
    exit 1
}

#######################################
# 解析参数
#######################################
parse_args() {
    while [[ $# -gt 0 ]]; do
        case "$1" in
            --install)
                if [[ "$ACTION" == "uninstall" ]]; then log "ERROR" "参数冲突（--install与--uninstall不可同时使用）"; usage; fi
                ACTION="install"
                shift
                ;;
            --uninstall)
                if [[ "$ACTION" == "install" ]]; then log "ERROR" "参数冲突（--install与--uninstall不可同时使用）"; usage; fi
                ACTION="uninstall"
                shift
                ;;
            --version)
                if [[ $# -lt 2 || "$2" == -* ]]; then log "ERROR" "--version需指定有效版本（如1.7.28-1）"; usage; fi
                CONTAINERD_VERSION="$2"
                shift 2
                ;;
            --help)
                usage
                ;;
            *)
                log "ERROR" "未知参数：$1"
                usage
                ;;
        esac
    done
    if [[ -z "$ACTION" ]]; then log "ERROR" "必须指定--install或--uninstall"; usage; fi
}

#######################################
# 前置检查
#######################################
pre_check() {
    log "INFO" "前置环境检查"
    # 检查root权限
    if [[ "$(id -u)" -ne 0 ]]; then log "ERROR" "请使用root权限执行（sudo）"; exit 1; fi
    # 检查Ubuntu系统
    if ! grep -q "Ubuntu" /etc/os-release; then log "ERROR" "仅支持Ubuntu系统"; exit 1; fi
    # 检查系统版本
    local os_version=$(grep VERSION_ID /etc/os-release | cut -d= -f2 | tr -d '"')
    if ! [[ "$os_version" =~ ^20\.04$ || "$os_version" =~ ^22\.04$ || "$os_version" =~ ^24\.04$ ]]; then
        log "ERROR" "仅支持Ubuntu 20.04/22.04/24.04 LTS版本"; exit 1; fi
    # 检查必要工具
    local required_tools=("apt-get" "systemctl" "sed" "grep")
    for tool in "${required_tools[@]}"; do
        if ! command -v "$tool" &> /dev/null; then
            log "INFO" "安装缺失工具：$tool"
            apt-get update -qq >/dev/null
            apt-get install -qq -y "$tool" >/dev/null
        fi
    done
    log "INFO" "前置检查通过"
}
######################################
# 安装必要依赖（屏蔽冗余日志，仅捕错）
install_dependencies() {
    log "INFO"  "正在安装依赖工具"
    # apt-get 静默执行，日志重定向到/dev/null，仅保留错误输出
    if ! apt-get update -qq >/dev/null 2>&1; then
        log "ERROR"  "更新软件源失败"
        exit 1
    fi
    if ! apt-get install -qq -y ca-certificates curl gnupg lsb-release >/dev/null 2>&1; then
	        log "ERROR"  "安装依赖（ca-certificates/curl等）失败"
        exit 1
    fi
    log "INFO"  "依赖工具安装完成"
}

# 添加Docker GPG密钥（自动覆盖，屏蔽日志）
add_gpg_key() {
    log "INFO"  "正在添加Docker GPG密钥"
    mkdir -p /etc/apt/keyrings
    # curl+gpg 静默执行，自动覆盖现有文件
    if ! curl -fsSL https://download.docker.com/linux/ubuntu/gpg | gpg --dearmor --yes -o /etc/apt/keyrings/docker.gpg >/dev/null 2>&1; then
	        log "ERROR"  "添加GPG密钥失败（网络或密钥地址异常）"
        exit 1
    fi
    log "INFO" s "GPG密钥添加完成"
}

# 添加Docker源（屏蔽日志）
add_docker_repo() {
    log "INFO"  "正在配置Docker软件源"
    # 写入源配置，更新源时静默执行
    echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" | tee /etc/apt/sources.list.d/docker.list >/dev/null 2>&1
    if ! apt-get update -qq >/dev/null 2>&1; then
        log "ERROR"  "更新Docker软件源失败"
        exit 1
    fi
    log "INFO"  "Docker软件源配置完成"
}

#######################################
# 验证版本可用性
#######################################
verify_version() {
    log "INFO" "验证版本${CONTAINERD_VERSION}可用性"
    # 提取源中可用的核心版本（忽略发行版后缀）
    local available_versions=$(apt-cache madison "$PACKAGE_NAME" | awk '{print $3}' | sed 's/~ubuntu\.[0-9]\+\.[0-9]\+~[a-z]\+//' | sort -u)
    if ! echo "$available_versions" | grep -qxF "$CONTAINERD_VERSION"; then
        log "ERROR" "版本${CONTAINERD_VERSION}不可用，可用版本："; echo "$available_versions" | tee -a "$LOG_FILE"; exit 1; fi
    log "INFO" "版本验证通过"
}

#######################################
# 安装containerd（匹配带后缀的完整版本）
#######################################
install_containerd() {
    log "INFO" "检查当前${PACKAGE_NAME}安装状态"
    # 获取源中带后缀的完整版本
    local full_version=$(apt-cache madison "$PACKAGE_NAME" | grep "$CONTAINERD_VERSION" | awk '{print $3}' | head -n 1)
    if [[ -z "$full_version" ]]; then log "ERROR" "未找到与${CONTAINERD_VERSION}匹配的完整版本"; exit 1; fi
    # 检查是否已安装目标版本
    if dpkg -l "$PACKAGE_NAME" &>/dev/null; then
        local installed_full_version=$(dpkg -l "$PACKAGE_NAME" | awk '/ii/ {print $3}')
        if [[ "$installed_full_version" == "$full_version" ]]; then
            log "INFO" "${PACKAGE_NAME} ${full_version}已安装，跳过安装"
            return
        fi
    fi
    # 安装完整版本
    log "INFO" "安装${PACKAGE_NAME}=${full_version}"
    if ! apt-get install -qq -y "${PACKAGE_NAME}=${full_version}" >/dev/null 2>&1; then
        log "ERROR" "安装失败，手动执行以下命令查看详细错误："; log "ERROR" "sudo apt-get install -y ${PACKAGE_NAME}=${full_version}"; exit 1; fi
    log "INFO" "${PACKAGE_NAME}安装完成"
}

#######################################
# 核心配置（仅保留：生成默认配置、替换镜像源、Cgroup驱动）
#######################################
configure_containerd() {
    log "INFO" "开始配置containerd"

    # 1. 生成默认配置文件
    log "INFO" "执行：containerd config default > $CONFIG_PATH"
    if [[ -f "$CONFIG_PATH" ]]; then
        log "INFO" "备份旧配置文件：${CONFIG_PATH}.bak"
        cp "$CONFIG_PATH" "${CONFIG_PATH}.bak"
    fi
    if ! containerd config default > "$CONFIG_PATH" 2>&1; then
        log "ERROR" "生成默认配置文件失败"; exit 1; fi

    # 2. 替换镜像源（registry.k8s.io -> 华为云）
    log "INFO" "执行：替换镜像源为华为云（registry.k8s.io -> swr.cn-north-4.myhuaweicloud.com/ddn-k8s/registry.k8s.io）"
    if ! sed -i 's#registry.k8s.io#swr.cn-north-4.myhuaweicloud.com/ddn-k8s/registry.k8s.io#' "$CONFIG_PATH" 2>&1; then
        log "ERROR" "镜像源替换失败"; exit 1; fi

    # 3. 配置Cgroup驱动器（SystemdCgroup = true）
    log "INFO" "执行：配置Cgroup驱动器为SystemdCgroup = true"
    if grep -q "SystemdCgroup \= false" "$CONFIG_PATH"; then
        sed -i 's/SystemdCgroup \= false/SystemdCgroup \= true/g' "$CONFIG_PATH"
        log "INFO" "Cgroup驱动器已设置为SystemdCgroup = true"
    else
        if grep -q "SystemdCgroup \= true" "$CONFIG_PATH"; then
            log "INFO" "Cgroup驱动器已为true，跳过修改"
        else
            log "WARNING" "未找到SystemdCgroup配置项，手动添加到runc.options区块"
            sed -i '/\[plugins\."io\.containerd\.grpc\.v1\.cri"\.containerd\.runtimes\.runc\.options\]/a \ \ \ \ SystemdCgroup \= true' "$CONFIG_PATH"
        fi
    fi

    # 重启服务应用配置
    log "INFO" "重启containerd服务"
    systemctl restart containerd >/dev/null 2>&1 || { log "ERROR" "containerd重启失败"; exit 1; }
    log "INFO" "containerd配置完成"
}

#######################################
# 启动服务并设置开机自启
#######################################
start_service() {
    log "INFO" "配置containerd服务自启"
    if systemctl is-enabled --quiet containerd; then
        log "INFO" "containerd已设置开机自启"
    else
        systemctl enable containerd >/dev/null 2>&1
        log "INFO" "已设置containerd开机自启"
    fi
    # 确保服务处于运行状态
    if systemctl is-active --quiet containerd; then
        log "INFO" "containerd服务已运行"
    else
        systemctl start containerd >/dev/null 2>&1
        log "INFO" "containerd服务已启动"
    fi
}

#######################################
# 验证安装结果（删除镜像加速相关检查）
#######################################
verify_installation() {
    log "INFO" "验证安装结果"
    # 检查服务状态
    if ! systemctl is-active --quiet containerd; then log "ERROR" "containerd服务未运行"; exit 1; fi
    # 检查镜像源替换
    if grep -q "swr.cn-north-4.myhuaweicloud.com/ddn-k8s/registry.k8s.io" "$CONFIG_PATH"; then
        log "INFO" "镜像源替换验证通过"
    else
        log "WARNING" "镜像源替换未生效，请检查$CONFIG_PATH"
    fi
    # 检查Cgroup配置
    if grep -q "SystemdCgroup \= true" "$CONFIG_PATH"; then
        log "INFO" "Cgroup驱动器配置验证通过"
    else
        log "WARNING" "Cgroup驱动器配置未生效，请检查$CONFIG_PATH"
    fi
    # 检查版本
    local installed_version=$(containerd --version | awk '/containerd/ {print $3}' | cut -d'+' -f1 | sed 's/^v//')
    if [[ "$installed_version" == "${CONTAINERD_VERSION%-*}" ]]; then
        log "INFO" "版本验证通过，当前版本：$installed_version"
    else
        log "WARNING" "版本不匹配：预期${CONTAINERD_VERSION%-*}，实际$installed_version"
    fi
    log "INFO" "所有验证完成"
}

#######################################
# 卸载containerd（删除镜像加速相关清理）
#######################################
uninstall_containerd() {
    log "INFO" "开始卸载containerd"
    # 停止服务
    if systemctl is-active --quiet containerd; then
        log "INFO" "停止containerd服务"
        systemctl stop containerd >/dev/null 2>&1
    fi
    # 卸载包
    if dpkg -l "$PACKAGE_NAME" &>/dev/null; then
        log "INFO" "卸载${PACKAGE_NAME}包"
        apt-get purge -qq -y "$PACKAGE_NAME" >/dev/null 2>&1
        log "INFO" "清理无用依赖"
        apt-get autoremove -qq -y >/dev/null 2>&1
    else
        log "INFO" "${PACKAGE_NAME}未安装，跳过卸载"
    fi
    # 清理配置和数据（删除镜像加速相关目录的清理）
    log "INFO" "清理残留文件"
    rm -rf "$CONFIG_PATH" "${CONFIG_PATH}.bak" /var/lib/containerd /var/log/containerd
    # 重新加载systemd
    systemctl daemon-reload >/dev/null 2>&1
    log "INFO" "containerd卸载完成"
}

#######################################
# 主流程
#######################################
main() {
    # 初始化日志
    > "$LOG_FILE"
    log "INFO" "===== Containerd管理脚本启动 ====="

    # 解析参数
    parse_args "$@"

    # 通用前置检查
    pre_check

    # 分支执行
    case "$ACTION" in
        install)
            install_dependencies
            add_gpg_key
            add_docker_repo
            verify_version
            install_containerd
            configure_containerd  # 仅含核心配置（无镜像加速）
            start_service
            verify_installation
            ;;
        uninstall)
            uninstall_containerd
            ;;
    esac

    log "INFO" "===== 操作完成 ====="
    log "INFO" "详细日志路径：$LOG_FILE"
}

# 启动主程序
main "$@"