from flask import Flask, request, jsonify
from flask_cors import CORS
import random
import datetime
import json

app = Flask(__name__)
CORS(app)

# 模拟数据生成函数
def generate_alert_data():
    alert_types = ['系统异常', '订单超时', '支付失败', '库存不足', '网络异常']
    levels = ['critical', 'major', 'minor']
    statuses = ['pending', 'processing', 'resolved']
    
    alerts = []
    for i in range(100):
        alert = {
            'id': f'alert_{i+1:03d}',
            'timestamp': (datetime.datetime.now() - datetime.timedelta(hours=random.randint(0, 24))).strftime('%Y-%m-%d %H:%M:%S'),
            'level': random.choice(levels),
            'type': random.choice(alert_types),
            'orderId': f'ORD{random.randint(100000, 999999)}',
            'status': random.choice(statuses),
            'description': f'告警描述信息 {i+1}'
        }
        alerts.append(alert)
    
    return alerts

# 全局模拟数据
MOCK_ALERTS = generate_alert_data()

@app.route('/api/v1/alerts/list', methods=['GET'])
def get_alerts_list():
    # 获取查询参数
    time_range = request.args.get('timeRange')
    level = request.args.get('level', '')
    status = request.args.get('status', '')
    page = int(request.args.get('page', 1))
    size = int(request.args.get('size', 20))
    
    # 过滤数据
    filtered_alerts = MOCK_ALERTS.copy()
    
    if level:
        filtered_alerts = [alert for alert in filtered_alerts if alert['level'] == level]
    
    if status:
        filtered_alerts = [alert for alert in filtered_alerts if alert['status'] == status]
    
    # 分页
    total = len(filtered_alerts)
    start_idx = (page - 1) * size
    end_idx = start_idx + size
    page_alerts = filtered_alerts[start_idx:end_idx]
    
    return jsonify({
        'list': page_alerts,
        'total': total
    })

@app.route('/api/v1/alerts/stats', methods=['GET'])
def get_alert_stats():
    total = len(MOCK_ALERTS)
    pending = len([alert for alert in MOCK_ALERTS if alert['status'] == 'pending'])
    resolved = len([alert for alert in MOCK_ALERTS if alert['status'] == 'resolved'])
    
    return jsonify({
        'total': total,
        'pending': pending,
        'resolved': resolved
    })

@app.route('/api/v1/alerts/handle', methods=['POST'])
def handle_alert():
    data = request.get_json()
    alert_id = data.get('alertId')
    comment = data.get('comment')
    
    # 模拟处理告警
    for alert in MOCK_ALERTS:
        if alert['id'] == alert_id:
            alert['status'] = 'resolved'
            break
    
    # 模拟成功/失败
    success = random.choice([True, True, True, False])  # 75% 成功率
    
    if success:
        return jsonify({
            'success': True,
            'message': '告警处理成功'
        })
    else:
        return jsonify({
            'success': False,
            'message': '处理失败，请重试'
        })

@app.route('/health', methods=['GET'])
def health_check():
    return jsonify({'status': 'ok'})

if __name__ == '__main__':
    print("启动告警监控后端服务...")
    print("API 端点:")
    print("- GET  /api/v1/alerts/list   - 获取告警列表")
    print("- GET  /api/v1/alerts/stats  - 获取告警统计")
    print("- POST /api/v1/alerts/handle - 处理告警")
    print("- GET  /health               - 健康检查")
    print("\n服务运行在: http://localhost:5000")
    
    app.run(host='0.0.0.0', port=5000, debug=True)