#!/bin/bash

# 交互式实时命令监控脚本 - 修复版
# 版本: 4.1

set -e

### 配置区域 ###
LOG_DIR="/root/command_monitor_logs"
SCRIPT_NAME="command_monitor.sh"
SCRIPT_PATH="/usr/local/bin/$SCRIPT_NAME"

### 颜色定义 ###
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
BLUE='\033[0;34m'
PURPLE='\033[0;35m'
CYAN='\033[0;36m'
NC='\033[0m'

### 全局变量 ###
CURRENT_LOG=""
LATEST_LOG=""
DAEMON_MODE=false

# 获取时间戳
timestamp() {
    date '+%Y-%m-%d %H:%M:%S'
}

# 日志函数
log_message() {
    local level="$1"
    local message="$2"
    local color="$GREEN"

    case "$level" in
        "ERROR") color="$RED" ;;
        "WARN") color="$YELLOW" ;;
        "INFO") color="$BLUE" ;;
        "SUCCESS") color="$GREEN" ;;
        "COMMAND") color="$CYAN" ;;
    esac

    if [ "$DAEMON_MODE" = true ]; then
        echo -e "${color}[$(timestamp)] [$level] $message${NC}" >> "$CURRENT_LOG"
    else
        echo -e "${color}[$(timestamp)] [$level] $message${NC}" | tee -a "$CURRENT_LOG"
    fi
}

# 英文转中文函数
english_to_chinese() {
    local text="$1"
    # 简化翻译，只保留主要城市和国家
    text=$(echo "$text" | sed 's/China/中国/g')
    text=$(echo "$text" | sed 's/Beijing/北京/g')
    text=$(echo "$text" | sed 's/Shanghai/上海/g')
    text=$(echo "$text" | sed 's/Guangzhou/广州/g')
    text=$(echo "$text" | sed 's/Shenzhen/深圳/g')
    text=$(echo "$text" | sed 's/Hangzhou/杭州/g')
    text=$(echo "$text" | sed 's/Nanjing/南京/g')
    text=$(echo "$text" | sed 's/Wuhan/武汉/g')
    text=$(echo "$text" | sed 's/Chengdu/成都/g')
    text=$(echo "$text" | sed 's/Xi'"'"'an/西安/g')
    text=$(echo "$text" | sed 's/Jiangxi/江西/g')
    text=$(echo "$text" | sed 's/Nanchang/南昌/g')
    text=$(echo "$text" | sed 's/Telecom/电信/g')
    text=$(echo "$text" | sed 's/Unicom/联通/g')
    text=$(echo "$text" | sed 's/Mobile/移动/g')
    echo "$text"
}

# 获取IP地理位置
get_ip_location() {
    local ip="$1"
    
    if [[ "$ip" == "192.168."* ]] || [[ "$ip" == "10."* ]] || [[ "$ip" == "172."* ]]; then
        echo "内网IP"
        return 0
    fi
    
    if [[ "$ip" == "127.0.0.1" ]] || [[ "$ip" == "localhost" ]] || [[ "$ip" == "unknown" ]]; then
        echo "本机"
        return 0
    fi
    
    local location_info=$(curl -s -m 3 "http://ip-api.com/json/$ip?fields=status,country,regionName,city,isp" 2>/dev/null || true)
    if [ -n "$location_info" ] && echo "$location_info" | grep -q '"status":"success"'; then
        local country=$(echo "$location_info" | grep -o '"country":"[^"]*"' | cut -d'"' -f4)
        local region=$(echo "$location_info" | grep -o '"regionName":"[^"]*"' | cut -d'"' -f4)
        local city=$(echo "$location_info" | grep -o '"city":"[^"]*"' | cut -d'"' -f4)
        local isp=$(echo "$location_info" | grep -o '"isp":"[^"]*"' | cut -d'"' -f4)
        
        if [ -n "$country" ]; then
            local result="$country"
            [ -n "$region" ] && result="$result-$region"
            [ -n "$city" ] && result="$result-$city"
            [ -n "$isp" ] && result="$result($isp)"
            echo $(english_to_chinese "$result")
            return 0
        fi
    fi
    
    echo "未知位置"
}

# 获取客户端IP
get_client_ip() {
    local ip="unknown"
    
    if [ -n "$SSH_CLIENT" ]; then
        ip=$(echo "$SSH_CLIENT" | awk '{print $1}')
    elif [ -n "$SSH_CONNECTION" ]; then
        ip=$(echo "$SSH_CONNECTION" | awk '{print $1}')
    else
        ip=$(who -m 2>/dev/null | awk '{print $5}' | sed 's/[()]//g' | head -1)
        if [[ "$ip" == ":0" ]] || [[ "$ip" == ":1" ]] || [[ -z "$ip" ]]; then
            ip="localhost"
        fi
    fi
    
    echo "$ip"
}

# 初始化日志系统
init_log_system() {
    mkdir -p "$LOG_DIR"
    
    local client_ip=$(get_client_ip | sed 's/\./_/g')
    local log_date=$(date '+%Y%m%d_%H%M%S')
    CURRENT_LOG="$LOG_DIR/monitor_${client_ip}_${log_date}.log"
    LATEST_LOG="$LOG_DIR/latest.log"
    
    ln -sf "$CURRENT_LOG" "$LATEST_LOG" 2>/dev/null || true
}

# 配置实时history记录
configure_realtime_history() {
    for user_dir in /home/* /root; do
        if [ -d "$user_dir" ]; then
            local user=$(basename "$user_dir")
            local bashrc="$user_dir/.bashrc"
            
            if [ -f "$bashrc" ] && ! grep -q "REAL_TIME_HISTORY" "$bashrc"; then
                cat >> "$bashrc" << 'EOF'

# REAL_TIME_HISTORY - 实时命令记录配置
export PROMPT_COMMAND='history -a; history -c; history -r'
export HISTTIMEFORMAT='%F %T '
export HISTSIZE=10000
export HISTFILESIZE=20000
shopt -s histappend
export HISTCONTROL=ignoredups:erasedups

EOF
            fi
        fi
    done
}

# 监控命令历史文件变化
monitor_history_files() {
    declare -A file_sizes
    declare -A last_commands
    
    # 初始化文件大小
    for user_dir in /home/* /root; do
        if [ -d "$user_dir" ]; then
            local user=$(basename "$user_dir")
            local history_file="$user_dir/.bash_history"
            if [ -f "$history_file" ]; then
                file_sizes["$user"]=$(stat -c%s "$history_file" 2>/dev/null || echo 0)
                last_commands["$user"]=""
            fi
        fi
    done
    
    # 监控循环
    while true; do
        for user_dir in /home/* /root; do
            if [ -d "$user_dir" ]; then
                local user=$(basename "$user_dir")
                local history_file="$user_dir/.bash_history"
                
                if [ -f "$history_file" ]; then
                    local current_size=$(stat -c%s "$history_file" 2>/dev/null || echo 0)
                    local last_size=${file_sizes["$user"]}
                    
                    if [ "$current_size" -gt "$last_size" ]; then
                        local new_content=$(tail -c +$((last_size + 1)) "$history_file" 2>/dev/null | tr -d '\0')
                        
                        if [ -n "$new_content" ]; then
                            while IFS= read -r line; do
                                line=$(echo "$line" | sed 's/^[ \t]*//;s/[ \t]*$//')
                                
                                # 过滤无用命令
                                if [ -n "$line" ] && [ "${#line}" -gt 1 ] && \
                                   [[ ! "$line" =~ ^(ls|cd|pwd|ll|la|history|exit|clear|echo|date|whoami)$ ]] && \
                                   [[ ! "$line" =~ ^#[0-9]+$ ]] && \
                                   [ "$line" != "${last_commands["$user"]}" ]; then
                                    
                                    local client_ip=$(get_client_ip)
                                    local location_info=$(get_ip_location "$client_ip")
                                    
                                    log_message "COMMAND" "用户: $user | 命令: $line | 来源: $client_ip [$location_info]"
                                    last_commands["$user"]="$line"
                                fi
                            done <<< "$new_content"
                        fi
                        
                        file_sizes["$user"]=$current_size
                    fi
                fi
            fi
        done
        sleep 1
    done
}

# 安装脚本到系统
install_script() {
    echo -e "${GREEN}正在安装脚本到系统...${NC}"
    
    # 下载并保存脚本
    local script_content=$(curl -sSL https://raw.githubusercontent.com/xzx3344521/dock/refs/heads/main/%E5%AE%9E%E6%97%B6%20history%20%E7%9B%91%E6%8E%A7 2>/dev/null || echo "")
    
    if [ -z "$script_content" ]; then
        echo -e "${RED}下载脚本失败${NC}"
        return 1
    fi
    
    # 保存到本地文件
    echo "$script_content" > "$SCRIPT_PATH"
    chmod +x "$SCRIPT_PATH"
    
    echo -e "${GREEN}✓ 脚本已安装到: $SCRIPT_PATH${NC}"
    return 0
}

# 设置开机自启动
setup_auto_start() {
    if [ ! -f "$SCRIPT_PATH" ]; then
        install_script
    fi
    
    # 创建systemd服务
    cat > /etc/systemd/system/command-monitor.service << EOF
[Unit]
Description=Command Monitor Service
After=network.target

[Service]
Type=forking
ExecStart=$SCRIPT_PATH --daemon
ExecStop=$SCRIPT_PATH --kill
Restart=always
User=root

[Install]
WantedBy=multi-user.target
EOF

    systemctl daemon-reload
    systemctl enable command-monitor.service
    echo -e "${GREEN}✓ 已设置开机自启动${NC}"
    echo -e "${YELLOW}启动服务: systemctl start command-monitor${NC}"
    echo -e "${YELLOW}停止服务: systemctl stop command-monitor${NC}"
}

# 取消开机自启动
remove_auto_start() {
    systemctl stop command-monitor.service 2>/dev/null || true
    systemctl disable command-monitor.service 2>/dev/null || true
    rm -f /etc/systemd/system/command-monitor.service
    systemctl daemon-reload
    echo -e "${YELLOW}✓ 已取消开机自启动${NC}"
}

# 后台运行监控（修复版）
start_background_monitor() {
    echo -e "${GREEN}启动后台监控服务...${NC}"
    
    # 检查是否已经在运行
    if [ -f "/tmp/command_monitor.pid" ]; then
        local old_pid=$(cat "/tmp/command_monitor.pid" 2>/dev/null)
        if ps -p "$old_pid" >/dev/null 2>&1; then
            echo -e "${YELLOW}监控服务已经在运行 (PID: $old_pid)${NC}"
            return 1
        fi
    fi
    
    # 直接启动监控进程
    (
        # 设置环境
        DAEMON_MODE=true
        init_log_system
        
        # 记录启动信息
        log_message "INFO" "后台监控进程启动 - PID: $$"
        log_message "INFO" "客户端IP: $(get_client_ip)"
        log_message "INFO" "地理位置: $(get_ip_location $(get_client_ip))"
        
        # 保存PID
        echo $$ > "/tmp/command_monitor.pid"
        
        # 配置实时记录
        configure_realtime_history
        
        # 启动监控
        monitor_history_files
        
        # 清理
        rm -f "/tmp/command_monitor.pid"
        
    ) &
    
    local main_pid=$!
    sleep 3
    
    # 检查是否启动成功
    if ps -p $main_pid >/dev/null 2>&1 && [ -f "/tmp/command_monitor.pid" ]; then
        echo -e "${GREEN}✓ 后台监控已启动!${NC}"
        echo -e "主进程PID: $main_pid"
        echo -e "日志文件: $LATEST_LOG"
        echo -e "查看日志: ${GREEN}tail -f $LATEST_LOG${NC}"
        echo -e "停止监控: ${RED}$0 --kill${NC}"
        return 0
    else
        echo -e "${RED}✗ 后台监控启动失败${NC}"
        echo -e "${YELLOW}尝试使用前台模式...${NC}"
        return 1
    fi
}

# 前台运行监控
start_foreground_monitor() {
    echo -e "${YELLOW}前台运行模式 (输入 TO 切换后台，Ctrl+C 停止)${NC}"
    echo -e "${GREEN}开始监控...${NC}"
    
    DAEMON_MODE=false
    init_log_system
    configure_realtime_history
    
    # 显示启动信息
    log_message "INFO" "前台监控启动 - PID: $$"
    log_message "INFO" "客户端IP: $(get_client_ip)"
    log_message "INFO" "地理位置: $(get_ip_location $(get_client_ip))"
    
    # 启动监控进程
    monitor_history_files &
    local monitor_pid=$!
    
    # 等待用户输入
    while true; do
        if read -t 1 -n 2 user_input 2>/dev/null; then
            if [ "$user_input" = "TO" ] || [ "$user_input" = "to" ]; then
                echo -e "\n${GREEN}切换到后台模式...${NC}"
                kill $monitor_pid 2>/dev/null || true
                start_background_monitor
                break
            fi
        fi
        
        # 检查监控进程是否还在运行
        if ! ps -p $monitor_pid >/dev/null 2>&1; then
            echo -e "${RED}监控进程异常退出${NC}"
            break
        fi
    done
}

# 查看监控状态
check_monitor_status() {
    local pid_file="/tmp/command_monitor.pid"
    local main_pid=""
    
    if [ -f "$pid_file" ]; then
        main_pid=$(cat "$pid_file" 2>/dev/null)
    fi
    
    if [ -z "$main_pid" ] || ! ps -p "$main_pid" >/dev/null 2>&1; then
        echo -e "${RED}✗ 监控服务未运行${NC}"
        return 1
    fi
    
    echo -e "${GREEN}✓ 监控服务运行中${NC}"
    echo "主进程PID: $main_pid"
    echo "日志目录: $LOG_DIR"
    
    if [ -f "$LATEST_LOG" ]; then
        local log_size=$(du -h "$LATEST_LOG" 2>/dev/null | cut -f1 || echo "未知")
        echo "当前日志大小: $log_size"
        echo
        echo -e "${YELLOW}最近3条记录:${NC}"
        tail -3 "$LATEST_LOG" 2>/dev/null | while read line; do
            echo "  $line"
        done || echo "  无法读取日志"
    fi
}

# 停止监控进程
stop_monitor() {
    local pid_file="/tmp/command_monitor.pid"
    local main_pid=""
    
    if [ -f "$pid_file" ]; then
        main_pid=$(cat "$pid_file")
        rm -f "$pid_file"
    fi
    
    if [ -z "$main_pid" ]; then
        main_pid=$(pgrep -f "monitor_history_files" | head -1)
    fi
    
    if [ -z "$main_pid" ]; then
        echo -e "${YELLOW}没有找到运行的监控进程${NC}"
        return 0
    fi
    
    echo -e "${YELLOW}正在停止监控进程 (PID: $main_pid)...${NC}"
    kill "$main_pid" 2>/dev/null || true
    sleep 2
    
    if ps -p "$main_pid" >/dev/null 2>&1; then
        echo -e "${RED}强制停止监控进程...${NC}"
        kill -9 "$main_pid" 2>/dev/null || true
    fi
    
    # 清理所有相关进程
    pkill -f "monitor_history_files" 2>/dev/null || true
    
    echo -e "${GREEN}✓ 监控进程已停止${NC}"
}

# 显示交互式菜单
show_interactive_menu() {
    clear
    echo -e "${GREEN}========================================${NC}"
    echo -e "${GREEN}       实时命令监控系统 v4.1${NC}"
    echo -e "${GREEN}========================================${NC}"
    echo
    echo -e "${YELLOW}请选择操作:${NC}"
    echo
    echo -e "  ${CYAN}1${NC}. 启动后台监控模式"
    echo -e "  ${CYAN}2${NC}. 启动前台监控模式"
    echo -e "  ${CYAN}3${NC}. 查看监控状态"
    echo -e "  ${CYAN}4${NC}. 停止监控服务"
    echo -e "  ${CYAN}5${NC}. 设置开机自启动"
    echo -e "  ${CYAN}6${NC}. 取消开机自启动"
    echo -e "  ${CYAN}7${NC}. 安装脚本到系统"
    echo -e "  ${CYAN}0${NC}. 退出"
    echo
    echo -e "${GREEN}========================================${NC}"
    echo -e "${YELLOW}提示:${NC}"
    echo -e "  - 前台模式下输入 ${CYAN}TO${NC} 可切换到后台"
    echo -e "  - 建议先安装脚本到系统再使用"
    echo -e "${GREEN}========================================${NC}"
    echo
}

# 处理用户选择
handle_user_choice() {
    local choice
    read -p "请输入选择 [0-7]: " choice
    
    case $choice in
        1)
            start_background_monitor
            ;;
        2)
            start_foreground_monitor
            ;;
        3)
            check_monitor_status
            ;;
        4)
            stop_monitor
            ;;
        5)
            setup_auto_start
            ;;
        6)
            remove_auto_start
            ;;
        7)
            install_script
            ;;
        0)
            echo -e "${GREEN}再见!${NC}"
            exit 0
            ;;
        *)
            echo -e "${RED}无效选择，请重新输入${NC}"
            ;;
    esac
    
    echo
    read -p "按回车键返回菜单..."
}

### 主程序 ###
main() {
    local command="${1:-}"
    
    # 命令行参数模式
    case "$command" in
        -d|--daemon)
            start_background_monitor
            exit $?
            ;;
        -s|--status)
            check_monitor_status
            exit $?
            ;;
        -k|--kill)
            stop_monitor
            exit $?
            ;;
        -h|--help|"")
            show_interactive_menu
            handle_user_choice
            ;;
        *)
            echo -e "${RED}未知选项: $command${NC}"
            echo "使用: $0 [--daemon|--status|--kill|--help]"
            exit 1
            ;;
    esac
}

# 如果是直接运行且没有参数，显示菜单
if [ $# -eq 0 ] && [ -t 0 ]; then
    while true; do
        show_interactive_menu
        handle_user_choice
    done
else
    main "$@"
fi