#!/usr/bin/env python3
"""
简单监控脚本
用于快速检查系统健康状态，不依赖外部工具
"""
import os
import sys
import time
import json
import requests
import psutil
from datetime import datetime
from pathlib import Path


class HealthChecker:
    """健康检查器"""

    def __init__(self, base_url='http://localhost:5000'):
        self.base_url = base_url
        self.checks = []

    def check_service_health(self):
        """检查服务健康状态"""
        print("\n🔍 检查服务健康状态...")
        try:
            response = requests.get(f'{self.base_url}/api/v1/health', timeout=5)
            if response.status_code == 200:
                data = response.json()
                if data.get('success'):
                    print("✅ 服务健康检查通过")
                    return True
            print("❌ 服务健康检查失败")
            return False
        except Exception as e:
            print(f"❌ 无法连接到服务: {str(e)}")
            return False

    def check_system_resources(self):
        """检查系统资源"""
        print("\n🔍 检查系统资源...")

        # CPU 使用率
        cpu_percent = psutil.cpu_percent(interval=1)
        print(f"  CPU 使用率: {cpu_percent:.1f}%")
        cpu_status = "✅" if cpu_percent < 80 else "⚠️" if cpu_percent < 90 else "❌"

        # 内存使用率
        memory = psutil.virtual_memory()
        print(f"  内存使用率: {memory.percent:.1f}%")
        memory_status = "✅" if memory.percent < 85 else "⚠️" if memory.percent < 95 else "❌"

        # 磁盘使用率
        disk = psutil.disk_usage('/')
        disk_percent = (disk.used / disk.total) * 100
        print(f"  磁盘使用率: {disk_percent:.1f}%")
        disk_status = "✅" if disk_percent < 90 else "⚠️" if disk_percent < 95 else "❌"

        # 负载均值
        load_avg = psutil.getloadavg()
        print(f"  系统负载: {load_avg[0]:.2f}, {load_avg[1]:.2f}, {load_avg[2]:.2f}")
        load_status = "✅" if load_avg[0] < 2 else "⚠️" if load_avg[0] < 4 else "❌"

        return all([
            cpu_status == "✅",
            memory_status == "✅",
            disk_status == "✅",
            load_status == "✅"
        ])

    def check_database_connection(self):
        """检查数据库连接"""
        print("\n🔍 检查数据库连接...")
        try:
            # 这里可以添加数据库连接检查
            # 由于需要导入Flask应用，暂时跳过
            print("✅ 数据库连接检查（跳过，需要应用上下文）")
            return True
        except Exception as e:
            print(f"❌ 数据库连接检查失败: {str(e)}")
            return False

    def check_disk_space(self):
        """检查磁盘空间"""
        print("\n🔍 检查磁盘空间...")
        disk_usage = psutil.disk_usage('/')
        free_gb = disk_usage.free / (1024**3)
        total_gb = disk_usage.total / (1024**3)
        print(f"  可用空间: {free_gb:.2f} GB / {total_gb:.2f} GB")
        return free_gb > 1  # 至少需要1GB可用空间

    def check_process_status(self):
        """检查关键进程"""
        print("\n🔍 检查关键进程...")
        processes = ['python', 'flask', 'nginx', 'mysql', 'redis']
        found_processes = []

        for proc in psutil.process_iter(['pid', 'name', 'cmdline']):
            try:
                if any(proc.info['name'] and proc.info['name'].lower().startswith(p.lower()) for p in processes):
                    found_processes.append(proc.info['name'])
            except (psutil.NoSuchProcess, psutil.AccessDenied):
                pass

        print(f"  发现进程: {', '.join(set(found_processes))}")
        return len(found_processes) > 0

    def check_log_files(self):
        """检查日志文件"""
        print("\n🔍 检查日志文件...")
        log_files = [
            'logs/kamaxitong.log',
            '/var/log/nginx/access.log',
            '/var/log/nginx/error.log'
        ]

        for log_file in log_files:
            path = Path(log_file)
            if path.exists():
                size_mb = path.stat().st_size / (1024 * 1024)
                print(f"  {log_file}: {size_mb:.2f} MB")
            else:
                print(f"  {log_file}: 文件不存在")

        return True

    def generate_report(self):
        """生成健康报告"""
        print("\n" + "=" * 60)
        print("📊 KaMiXiTong 系统健康报告")
        print("=" * 60)
        print(f"检查时间: {datetime.now().strftime('%Y-%m-%d %H:%M:%S')}")

        # 运行所有检查
        checks = [
            ('服务健康', self.check_service_health),
            ('系统资源', self.check_system_resources),
            ('数据库连接', self.check_database_connection),
            ('磁盘空间', self.check_disk_space),
            ('进程状态', self.check_process_status),
            ('日志文件', self.check_log_files)
        ]

        results = []
        for name, check_func in checks:
            try:
                result = check_func()
                results.append((name, result))
            except Exception as e:
                print(f"❌ {name}检查失败: {str(e)}")
                results.append((name, False))

        # 生成报告
        print("\n" + "=" * 60)
        print("📋 检查结果汇总")
        print("=" * 60)

        all_passed = True
        for name, passed in results:
            status = "✅ 通过" if passed else "❌ 失败"
            print(f"{name:20s}: {status}")
            if not passed:
                all_passed = False

        print("\n" + "=" * 60)
        if all_passed:
            print("✅ 系统健康状态良好")
        else:
            print("⚠️ 发现问题，请查看上述详细信息")
        print("=" * 60)

        return all_passed

    def save_report(self, filename='health_report.json'):
        """保存健康报告到文件"""
        report = {
            'timestamp': datetime.now().isoformat(),
            'checks': [
                {
                    'name': name,
                    'passed': passed,
                    'time': datetime.now().isoformat()
                }
                for name, passed in self.results
            ],
            'system_info': {
                'cpu_count': psutil.cpu_count(),
                'memory_total': psutil.virtual_memory().total,
                'disk_total': psutil.disk_usage('/').total
            }
        }

        with open(filename, 'w') as f:
            json.dump(report, f, indent=2)

        print(f"\n📄 健康报告已保存到: {filename}")


def main():
    """主函数"""
    print("=" * 60)
    print("🔍 KaMiXiTong 系统健康检查")
    print("=" * 60)

    # 获取基础URL
    base_url = input("请输入服务地址 (默认: http://localhost:5000): ").strip()
    if not base_url:
        base_url = 'http://localhost:5000'

    checker = HealthChecker(base_url)
    passed = checker.generate_report()

    # 保存报告
    save = input("\n是否保存健康报告? (y/N): ").strip().lower()
    if save == 'y':
        checker.save_report()

    sys.exit(0 if passed else 1)


if __name__ == '__main__':
    main()