"""
系统监控和健康检查API
提供系统状态、性能指标和健康检查功能
"""
from flask import jsonify, current_app
from datetime import datetime, timedelta
import psutil
import time
from app import db
from app.models import License, Product, Order, Ticket, Device
from . import api_bp


@api_bp.route('/health', methods=['GET'])
def health_check():
    """
    健康检查端点
    返回系统的基本健康状态
    """
    try:
        # 检查数据库连接
        db.session.execute('SELECT 1')

        health_status = {
            'status': 'healthy',
            'timestamp': datetime.utcnow().isoformat(),
            'version': current_app.config.get('API_VERSION', 'v1'),
            'environment': 'production' if not current_app.debug else 'development'
        }

        return jsonify({
            'success': True,
            'data': health_status
        }), 200

    except Exception as e:
        current_app.logger.error(f"健康检查失败: {str(e)}")
        return jsonify({
            'success': False,
            'status': 'unhealthy',
            'error': str(e),
            'timestamp': datetime.utcnow().isoformat()
        }), 503


@api_bp.route('/metrics', methods=['GET'])
def system_metrics():
    """
    系统性能指标端点
    返回系统的性能指标（Prometheus格式）
    """
    try:
        # CPU使用率
        cpu_percent = psutil.cpu_percent(interval=1)

        # 内存使用情况
        memory = psutil.virtual_memory()

        # 磁盘使用情况
        disk = psutil.disk_usage('/')

        # 数据库统计
        stats = get_database_stats()

        metrics = {
            'system': {
                'cpu_usage_percent': cpu_percent,
                'memory': {
                    'total': memory.total,
                    'available': memory.available,
                    'used': memory.used,
                    'percent': memory.percent
                },
                'disk': {
                    'total': disk.total,
                    'used': disk.used,
                    'free': disk.free,
                    'percent': (disk.used / disk.total) * 100
                }
            },
            'database': stats,
            'timestamp': datetime.utcnow().isoformat()
        }

        return jsonify({
            'success': True,
            'data': metrics
        }), 200

    except Exception as e:
        current_app.logger.error(f"获取系统指标失败: {str(e)}")
        return jsonify({
            'success': False,
            'error': str(e),
            'timestamp': datetime.utcnow().isoformat()
        }), 500


def get_database_stats():
    """获取数据库统计信息"""
    try:
        # 卡密统计
        total_licenses = License.query.count()
        active_licenses = License.query.filter_by(status=1).count()
        expired_licenses = License.query.filter_by(status=2).count()

        # 产品统计
        total_products = Product.query.filter_by(status=1).count()

        # 订单统计
        total_orders = Order.query.count()
        paid_orders = Order.query.filter_by(status=1).count()
        pending_orders = Order.query.filter_by(status=0).count()

        # 工单统计
        total_tickets = Ticket.query.count()
        open_tickets = Ticket.query.filter_by(status__in=[0, 1]).count()

        # 设备统计
        total_devices = Device.query.filter_by(status=1).count()

        # 最近24小时的订单
        yesterday = datetime.utcnow() - timedelta(days=1)
        recent_orders = Order.query.filter(Order.create_time >= yesterday).count()

        return {
            'licenses': {
                'total': total_licenses,
                'active': active_licenses,
                'expired': expired_licenses,
                'inactive': total_licenses - active_licenses - expired_licenses
            },
            'products': {
                'total': total_products
            },
            'orders': {
                'total': total_orders,
                'paid': paid_orders,
                'pending': pending_orders,
                'recent_24h': recent_orders
            },
            'tickets': {
                'total': total_tickets,
                'open': open_tickets
            },
            'devices': {
                'total': total_devices
            }
        }

    except Exception as e:
        current_app.logger.error(f"获取数据库统计失败: {str(e)}")
        return {}


@api_bp.route('/ping', methods=['GET'])
def ping():
    """
    简单的ping端点
    用于快速检查服务是否可用
    """
    return jsonify({
        'success': True,
        'message': 'pong',
        'timestamp': datetime.utcnow().isoformat()
    }), 200