#!/bin/bash

##############################################
# Snapshot 后端服务状态检查脚本
# 适用于 Linux 环境
##############################################

# 颜色输出
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
BLUE='\033[0;34m'
NC='\033[0m' # No Color

print_info() {
    echo -e "${GREEN}[INFO]${NC} $1"
}

print_error() {
    echo -e "${RED}[ERROR]${NC} $1"
}

print_warning() {
    echo -e "${YELLOW}[WARNING]${NC} $1"
}

echo "============================================"
echo "Snapshot 后端服务状态"
echo "============================================"
echo

# 检查进程
echo "[1] 进程状态"
echo "--------------------------------------------"
PIDS=$(pgrep -f "snapshot-backend-1.0.0.jar")
if [ -n "$PIDS" ]; then
    print_info "服务正在运行"
    echo "进程ID: $PIDS"
    echo
    ps -p $PIDS -o pid,ppid,cmd,%mem,%cpu,etime
else
    print_warning "服务未运行"
fi
echo

# 检查端口占用
echo "[2] 端口状态"
echo "--------------------------------------------"
if command_exists netstat; then
    PORT_INFO=$(netstat -tuln 2>/dev/null | grep :7626)
    if [ -n "$PORT_INFO" ]; then
        print_info "端口 7626 已被占用"
        echo "$PORT_INFO"
    else
        print_warning "端口 7626 未被占用"
    fi
elif command_exists ss; then
    PORT_INFO=$(ss -tuln 2>/dev/null | grep :7626)
    if [ -n "$PORT_INFO" ]; then
        print_info "端口 7626 已被占用"
        echo "$PORT_INFO"
    else
        print_warning "端口 7626 未被占用"
    fi
else
    print_warning "无法检查端口状态（缺少netstat和ss命令）"
fi
echo

# 检查日志
echo "[3] 日志信息"
echo "--------------------------------------------"
if [ -f "app.log" ]; then
    print_info "日志文件存在: app.log"
    LOG_SIZE=$(du -h app.log | cut -f1)
    echo "文件大小: $LOG_SIZE"
    echo
    echo "最近20行日志:"
    echo "--------------------------------------------"
    tail -n 20 app.log
    echo "--------------------------------------------"
    echo
    echo "查看完整日志: tail -f app.log"
else
    print_warning "日志文件不存在"
fi
echo

# 健康检查
echo "[4] 健康检查"
echo "--------------------------------------------"
if command_exists curl; then
    HTTP_CODE=$(curl -s -o /dev/null -w "%{http_code}" http://localhost:7626 2>/dev/null)
    if [ "$HTTP_CODE" = "200" ]; then
        print_info "HTTP健康检查通过 (200)"
    elif [ -n "$HTTP_CODE" ] && [ "$HTTP_CODE" != "000" ]; then
        print_warning "HTTP响应: $HTTP_CODE"
    else
        print_error "无法连接到服务"
    fi
else
    print_warning "未找到curl命令，跳过HTTP健康检查"
fi
echo

# JVM信息（如果进程在运行）
if [ -n "$PIDS" ]; then
    echo "[5] JVM信息"
    echo "--------------------------------------------"
    if command_exists jps; then
        print_info "Java进程信息:"
        jps -lvm | grep snapshot
    fi
    echo
fi

echo "============================================"