#!/bin/bash

# 修复版实时命令监控脚本 - 多IP查询源 + 优化后台模式
# 版本: 3.1

set -e

### 配置区域 ###
LOG_DIR="/root/command_monitor_logs"
MAX_LOG_SIZE="1M"
MAX_LOG_FILES=50                     # 增加最大文件数避免覆盖
LOG_ROTATE_INTERVAL=1800
MEMORY_LIMIT="512M"
CPU_LIMIT=90
CHECK_INTERVAL=300
BACKUP_DAYS=7
CLEANUP_INTERVAL=3600

### IP地理位置配置 - 多个备用源 ###
IP_API_SERVICES=("ipapi" "ipapi.co" "ipinfo.io" "ip-api.com" "ipapi.com")
CACHE_IP_INFO=true
IP_CACHE_FILE="/tmp/ip_geo_cache.txt"
CACHE_EXPIRE=86400

### 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 ###
SCRIPT_PID=$$
MONITOR_PID=""
LAST_CLEANUP=0
LAST_ROTATION=0
CURRENT_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
}

# 增强版IP地理位置查询 - 多备用源
get_ip_location() {
    local ip="$1"
    
    # 检查内网IP
    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
    
    # 检查缓存
    if [ "$CACHE_IP_INFO" = true ] && [ -f "$IP_CACHE_FILE" ]; then
        local cached_info=$(grep "^$ip|" "$IP_CACHE_FILE" | head -1)
        if [ -n "$cached_info" ]; then
            local cache_time=$(echo "$cached_info" | cut -d'|' -f2)
            local current_time=$(date +%s)
            if [ $((current_time - cache_time)) -lt $CACHE_EXPIRE ]; then
                echo "$cached_info" | cut -d'|' -f3-
                return 0
            fi
        fi
    fi
    
    local location_info=""
    
    # 方法1: ip-api.com (最可靠)
    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 "$country" ]; then
            location_info="$country"
            [ -n "$region" ] && location_info="$location_info-$region"
            [ -n "$city" ] && location_info="$location_info-$city"
            [ -n "$isp" ] && location_info="$location_info($isp)"
        fi
    fi
    
    # 方法2: ipapi.co (备用)
    if [ -z "$location_info" ] || [ "$location_info" = "null" ]; then
        location_info=$(curl -s -m 3 "https://ipapi.co/$ip/json/" 2>/dev/null | \
            grep -o '"country_name":"[^"]*","region":"[^"]*","city":"[^"]*","org":"[^"]*"' | \
            sed 's/"country_name":"//;s/","region":"/-/;s/","city":"/-/;s/","org":"/(/;s/"$//;s/$/)/' || true)
    fi
    
    # 方法3: ipinfo.io (备用)
    if [ -z "$location_info" ] || [ "$location_info" = "null" ]; then
        location_info=$(curl -s -m 3 "https://ipinfo.io/$ip" 2>/dev/null | \
            grep -o '"country":"[^"]*","region":"[^"]*","city":"[^"]*","org":"[^"]*"' | \
            sed 's/"country":"//;s/","region":"/-/;s/","city":"/-/;s/","org":"/(/;s/"$//;s/$/)/' || true)
    fi
    
    # 方法4: 使用whois查询 (最后备用)
    if [ -z "$location_info" ] || [ "$location_info" = "null" ]; then
        if command -v whois &> /dev/null; then
            location_info=$(timeout 5 whois "$ip" 2>/dev/null | \
                grep -iE "country:|descr:|Organization:" | head -2 | \
                awk -F: '{print $2}' | sed 's/^ *//' | tr '\n' ' ' | sed 's/  / /g' | head -c 50)
            if [ -n "$location_info" ]; then
                location_info="whois:$location_info"
            fi
        fi
    fi
    
    # 如果所有方法都失败
    if [ -z "$location_info" ] || [ "$location_info" = "null" ]; then
        location_info="未知位置"
    fi
    
    # 缓存结果
    if [ "$CACHE_IP_INFO" = true ]; then
        mkdir -p "$(dirname "$IP_CACHE_FILE")"
        # 删除旧的缓存条目
        grep -v "^$ip|" "$IP_CACHE_FILE" 2>/dev/null > "${IP_CACHE_FILE}.tmp" || true
        echo "$ip|$(date +%s)|$location_info" >> "${IP_CACHE_FILE}.tmp"
        mv "${IP_CACHE_FILE}.tmp" "$IP_CACHE_FILE" 2>/dev/null || true
    fi
    
    echo "$location_info"
}

# 获取城市名称（用于日志文件名）
get_city_name() {
    local ip="$1"
    local location=$(get_ip_location "$ip")
    
    # 从位置信息中提取城市名
    if [[ "$location" == *"-"* ]]; then
        # 格式: 中国-江西-南昌(中国电信)
        local city=$(echo "$location" | awk -F'-' '{print $NF}' | sed 's/(.*//')
        if [ -n "$city" ] && [ "$city" != "未知位置" ]; then
            # 清理特殊字符，只保留中文、英文、数字
            echo "$city" | sed 's/[^a-zA-Z0-9\u4e00-\u9fff]/_/g'
        else
            echo "unknown"
        fi
    else
        echo "unknown"
    fi
}

# 获取客户端IP
get_client_ip() {
    local ip="unknown"
    
    # 方法1: 从SSH连接获取
    if [ -n "$SSH_CLIENT" ]; then
        ip=$(echo "$SSH_CLIENT" | awk '{print $1}')
    elif [ -n "$SSH_CONNECTION" ]; then
        ip=$(echo "$SSH_CONNECTION" | awk '{print $1}')
    fi
    
    # 方法2: 从who命令获取
    if [ "$ip" = "unknown" ]; then
        ip=$(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
    
    # 方法3: 从网络连接获取
    if [ "$ip" = "unknown" ] || [ "$ip" = "localhost" ]; then
        ip=$(netstat -tn 2>/dev/null | grep ESTABLISHED | awk '{print $5}' | cut -d: -f1 | head -1)
    fi
    
    echo "$ip"
}

# 生成唯一日志文件名（避免覆盖）
generate_log_filename() {
    local client_ip=$(get_client_ip)
    local city_name=$(get_city_name "$client_ip")
    local log_date=$(date '+%Y%m%d_%H%M%S')
    local counter=1
    local base_name=""
    
    # 构建基础文件名
    if [ "$city_name" != "unknown" ]; then
        base_name="monitor_${client_ip//./_}_${city_name}_${log_date}"
    else
        base_name="monitor_${client_ip//./_}_${log_date}"
    fi
    
    local log_file="$LOG_DIR/${base_name}.log"
    
    # 如果文件已存在，添加序号
    while [ -f "$log_file" ]; do
        log_file="$LOG_DIR/${base_name}_${counter}.log"
        counter=$((counter + 1))
        if [ $counter -gt 100 ]; then
            break
        fi
    done
    
    echo "$log_file"
}

# 智能日志轮转检查
check_log_rotation() {
    local current_time=$(date +%s)
    
    # 检查时间间隔
    if [ $((current_time - LAST_ROTATION)) -ge $LOG_ROTATE_INTERVAL ]; then
        log_rotation "time"
        return 0
    fi
    
    # 检查文件大小
    if [ -f "$CURRENT_LOG" ]; then
        local log_size=$(stat -c%s "$CURRENT_LOG" 2>/dev/null || echo 0)
        local max_bytes=1048576  # 1M in bytes
        
        if [ "$log_size" -gt "$max_bytes" ]; then
            log_rotation "size"
            return 0
        fi
    fi
    
    return 1
}

# 初始化日志系统
init_log_system() {
    mkdir -p "$LOG_DIR"
    
    # 生成唯一日志文件名
    CURRENT_LOG=$(generate_log_filename)
    LATEST_LOG="$LOG_DIR/latest.log"
    
    # 创建软链接
    ln -sf "$CURRENT_LOG" "$LATEST_LOG" 2>/dev/null || true
    
    LAST_ROTATION=$(date +%s)
    
    log_message "INFO" "监控脚本启动 - PID: $$"
    
    local client_ip=$(get_client_ip)
    log_message "INFO" "客户端IP: $client_ip"
    
    local location_info=$(get_ip_location "$client_ip")
    log_message "INFO" "地理位置: $location_info"
    log_message "INFO" "日志文件: $CURRENT_LOG"
    log_message "INFO" "日志轮转: ${LOG_ROTATE_INTERVAL}秒或${MAX_LOG_SIZE}"
    
    # 显示IP查询结果详情
    if [ "$location_info" = "未知位置" ]; then
        log_message "WARN" "IP地理位置查询失败，请检查网络连接"
    fi
}

# 日志轮转
log_rotation() {
    local reason="$1"
    log_message "INFO" "执行日志轮转 - 原因: $reason"
    
    # 保存当前日志的最终信息
    if [ -f "$CURRENT_LOG" ]; then
        local log_size=$(du -h "$CURRENT_LOG" 2>/dev/null | cut -f1 || echo "未知")
        log_message "INFO" "原日志文件大小: $log_size"
    fi
    
    # 重新初始化日志系统
    init_log_system
    log_message "INFO" "新日志文件已创建"
}

# 资源监控函数
monitor_resources() {
    local check_count=0
    
    while true; do
        sleep 60
        
        # 检查日志轮转条件
        check_log_rotation
        
        # 检查内存使用
        local mem_usage=$(free 2>/dev/null | awk 'NR==2{printf "%.2f", $3*100/$2}' || echo "0")
        if (( $(echo "$mem_usage > $CPU_LIMIT" | bc -l 2>/dev/null) )); then
            log_message "WARN" "内存使用率过高: ${mem_usage}%"
        fi
        
        # 检查CPU使用率
        local cpu_usage=$(top -bn1 2>/dev/null | grep "Cpu(s)" | awk '{print $2}' | cut -d'%' -f1 || echo "0")
        if (( $(echo "$cpu_usage > $CPU_LIMIT" | bc -l 2>/dev/null) )); then
            log_message "WARN" "CPU使用率过高: ${cpu_usage}%"
        fi
        
        # 定期系统检查
        ((check_count++))
        if [ $((check_count * 60)) -ge $CHECK_INTERVAL ]; then
            perform_system_check
            check_count=0
        fi
        
        # 定期清理旧日志
        local current_time=$(date +%s)
        if [ $((current_time - LAST_CLEANUP)) -ge $CLEANUP_INTERVAL ]; then
            cleanup_old_logs
            LAST_CLEANUP=$current_time
        fi
    done
}

# 系统健康检查
perform_system_check() {
    log_message "INFO" "=== 系统健康检查 ==="
    
    # 内存信息
    local mem_info=$(free -h 2>/dev/null || echo "无法获取内存信息")
    log_message "INFO" "内存使用: $mem_info"
    
    # 磁盘信息
    local disk_info=$(df -h "$LOG_DIR" 2>/dev/null | tail -1 || echo "无法获取磁盘信息")
    log_message "INFO" "磁盘使用: $disk_info"
    
    # 日志文件信息
    local log_count=$(find "$LOG_DIR" -name "monitor_*.log" 2>/dev/null | wc -l)
    local total_log_size=$(du -sh "$LOG_DIR" 2>/dev/null | cut -f1 || echo "0")
    log_message "INFO" "日志文件数: $log_count, 总大小: $total_log_size"
    
    log_message "INFO" "=== 检查完成 ==="
}

# 清理旧日志
cleanup_old_logs() {
    log_message "INFO" "开始清理旧日志..."
    
    # 按时间清理
    local deleted_count=$(find "$LOG_DIR" -name "monitor_*.log" -mtime "+$BACKUP_DAYS" -delete -print 2>/dev/null | wc -l)
    if [ "$deleted_count" -gt 0 ]; then
        log_message "INFO" "已删除 $deleted_count 个过期日志文件"
    fi
    
    # 按数量清理（保留最新的）
    local log_count=$(find "$LOG_DIR" -name "monitor_*.log" 2>/dev/null | wc -l)
    if [ "$log_count" -gt "$MAX_LOG_FILES" ]; then
        local files_to_delete=$((log_count - MAX_LOG_FILES))
        find "$LOG_DIR" -name "monitor_*.log" -type f -printf '%T@ %p\n' 2>/dev/null | \
        sort -n 2>/dev/null | head -n "$files_to_delete" | cut -d' ' -f2- | while read file; do
            rm -f "$file" 2>/dev/null && log_message "INFO" "删除旧日志: $(basename "$file")"
        done
    fi
    
    log_message "SUCCESS" "日志清理完成"
}

# 信号处理函数
setup_signal_handlers() {
    trap 'cleanup_on_exit' SIGINT SIGTERM
    trap 'log_message "WARN" "收到挂起信号"; cleanup_on_exit' SIGHUP
    trap 'log_rotation "manual"' SIGUSR1
}

# 退出清理
cleanup_on_exit() {
    log_message "INFO" "正在停止监控服务..."
    
    if [ -n "$MONITOR_PID" ]; then
        kill "$MONITOR_PID" 2>/dev/null || true
    fi
    
    pkill -f "monitor_resources" 2>/dev/null || true
    
    log_message "SUCCESS" "监控服务已停止"
    exit 0
}

# 配置实时history
configure_realtime_history() {
    log_message "INFO" "配置实时命令记录..."
    
    for user_dir in /home/* /root; do
        if [ -d "$user_dir" ]; then
            local user=$(basename "$user_dir")
            local bashrc="$user_dir/.bashrc"
            
            if [ -f "$bashrc" ]; then
                if ! grep -q "REAL_TIME_HISTORY" "$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
                    log_message "SUCCESS" "已为用户 $user 配置实时命令记录"
                else
                    log_message "INFO" "用户 $user 已配置实时记录"
                fi
            fi
        fi
    done
}

# 过滤无用命令
should_ignore_command() {
    local command="$1"
    
    # 忽略空命令和很短的无意义命令
    if [ -z "$command" ] || [ "${#command}" -lt 2 ]; then
        return 0
    fi
    
    # 忽略history时间戳行
    if [[ "$command" =~ ^#[0-9]+$ ]]; then
        return 0
    fi
    
    # 忽略常见简单命令
    local ignore_patterns=(
        "ls" "cd" "pwd" "ll" "la" "history" "exit" "clear"
        "echo" "date" "whoami" "id" "uname" "uptime"
    )
    
    for pattern in "${ignore_patterns[@]}"; do
        if [ "$command" = "$pattern" ]; then
            return 0
        fi
    done
    
    return 1
}

# 主监控函数
start_main_monitor() {
    log_message "INFO" "启动主监控进程..."
    
    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["$user"]=""
            else
                file_sizes["$user"]=0
                last_commands["$user"]=""
            fi
        fi
    done
    
    # 主监控循环
    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 "$line" | sed 's/^[ \t]*//;s/[ \t]*$//')
                                
                                if ! should_ignore_command "$line" && [ "$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
}

# 后台运行监控（优化版）
start_background_monitor() {
    log_message "INFO" "启动后台监控服务..."
    
    # 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}"
            echo -e "停止现有服务: ${RED}kill $old_pid${NC}"
            return 1
        fi
    fi
    
    # 在子进程中运行
    (
        # 设置进程组，便于管理
        setsid >/dev/null 2>&1
        
        # 重新初始化
        DAEMON_MODE=true
        init_log_system
        setup_signal_handlers
        configure_realtime_history
        
        log_message "INFO" "后台监控进程启动 - PID: $$"
        log_message "INFO" "进程组ID: $(ps -o pgid= $$ | tr -d ' ')"
        
        # 保存PID
        echo $$ > "/tmp/command_monitor.pid"
        
        # 启动资源监控
        monitor_resources &
        local resource_pid=$!
        
        # 启动主监控
        start_main_monitor &
        MONITOR_PID=$!
        
        log_message "SUCCESS" "后台监控服务已启动"
        log_message "INFO" "主监控PID: $MONITOR_PID"
        log_message "INFO" "资源监控PID: $resource_pid"
        log_message "INFO" "查看实时日志: tail -f $LATEST_LOG"
        log_message "INFO" "停止监控: kill $$"
        
        # 等待子进程
        wait $MONITOR_PID
        
        # 清理PID文件
        rm -f "/tmp/command_monitor.pid"
        
    ) >/dev/null 2>&1 &
    
    local main_pid=$!
    sleep 2
    
    # 检查是否启动成功
    if ps -p $main_pid >/dev/null 2>&1; then
        echo -e "${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}kill $main_pid${NC}"
        echo -e "状态检查: ${BLUE}$0 -s${NC}"
    else
        echo -e "${RED}✗ 后台监控启动失败${NC}"
        return 1
    fi
}

# 显示使用说明
show_usage() {
    echo -e "${GREEN}实时命令监控系统 v3.1${NC}"
    echo "用法: $0 [选项]"
    echo
    echo "选项:"
    echo "  -d, --daemon    后台运行模式"
    echo "  -c, --config    只配置不运行"
    echo "  -s, --status    查看监控状态"
    echo "  -k, --kill      停止监控进程"
    echo "  -r, --rotate    轮转日志文件"
    echo "  -h, --help      显示此帮助信息"
    echo
    echo "日志特性:"
    echo "  - 每30分钟或1M自动轮转"
    echo "  - 多IP地理位置查询源"
    echo "  - 唯一日志文件名，避免覆盖"
    echo
    echo "示例:"
    echo "  $0 -d          # 后台运行监控"
    echo "  $0 -s          # 查看监控状态"
    echo "  $0 -k          # 停止监控"
}

# 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}"
        
        # 检查是否有残留进程
        local residual_pids=$(pgrep -f "command_monitor" 2>/dev/null || true)
        if [ -n "$residual_pids" ]; then
            echo -e "${YELLOW}发现残留进程: $residual_pids${NC}"
            echo -e "建议清理: ${RED}pkill -f 'command_monitor'${NC}"
        fi
        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"
    echo "最新日志: $LATEST_LOG"
    
    if [ -f "$LATEST_LOG" ]; then
        local log_size=$(du -h "$LATEST_LOG" 2>/dev/null | cut -f1 || echo "未知")
        local log_count=$(find "$LOG_DIR" -name "monitor_*.log" 2>/dev/null | wc -l)
        local log_files=$(find "$LOG_DIR" -name "monitor_*.log" -exec basename {} \; 2>/dev/null | head -5)
        
        echo "当前日志大小: $log_size"
        echo "总日志文件数: $log_count"
        echo
        echo -e "${YELLOW}最近日志文件:${NC}"
        for file in $log_files; do
            echo "  $file"
        done
        echo
        echo -e "${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 "$main_pid" ]; then
        # 如果没有PID文件，尝试查找进程
        main_pid=$(pgrep -f "command_monitor" | 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}"
    
    # 优雅停止
    kill "$main_pid" 2>/dev/null || true
    sleep 3
    
    # 检查是否停止成功
    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
        sleep 1
    fi
    
    # 清理所有相关进程
    pkill -f "monitor_resources" 2>/dev/null || true
    
    # 清理PID文件
    rm -f "$pid_file" 2>/dev/null
    
    echo -e "${GREEN}✓ 监控进程已停止${NC}"
}

### 主程序 ###
main() {
    local command="${1:-}"
    
    case "$command" in
        -d|--daemon)
            start_background_monitor
            ;;
        -c|--config)
            init_log_system
            configure_realtime_history
            ;;
        -s|--status)
            check_monitor_status
            ;;
        -k|--kill)
            stop_monitor
            ;;
        -r|--rotate)
            init_log_system
            log_rotation "manual"
            ;;
        -h|--help|"")
            show_usage
            ;;
        *)
            echo -e "${RED}未知选项: $command${NC}"
            echo
            show_usage
            return 1
            ;;
    esac
}

# 直接运行模式（当没有参数时）
if [ $# -eq 0 ]; then
    echo -e "${YELLOW}前台运行模式 (Ctrl+C 停止)${NC}"
    init_log_system
    setup_signal_handlers
    configure_realtime_history
    start_main_monitor
else
    main "$1"
fi