import db from './db.js';
import crypto from 'crypto';

export class SystemService {
  /**
   * 记录审计日志
   */
  static logAudit(userId: string | null, action: string, status: string, payload: any = {}, ip: string = '') {
    try {
      db.prepare(`
        INSERT INTO audit_logs (user_id, action, status, payload, ip)
        VALUES (?, ?, ?, ?, ?)
      `).run(userId, action, status, JSON.stringify(payload), ip);
    } catch (err) {
      console.error('[AuditLog] 写入失败:', err);
    }
  }

  /**
   * 发送系统通知
   */
  static async sendNotification(userId: string, title: string, content: string, type: string = 'info') {
    const id = `NOTI_${crypto.randomBytes(4).toString('hex').toUpperCase()}`;
    try {
      db.prepare(`
        INSERT INTO notifications (id, user_id, title, content, type)
        VALUES (?, ?, ?, ?, ?)
      `).run(id, userId, title, content, type);
      console.log(`[Notification] 已发送至用户 ${userId}: ${title}`);
    } catch (err) {
      console.error('[Notification] 发送失败:', err);
    }
  }

  /**
   * 获取最近审计日志 (用于监控面板)
   */
  static getRecentLogs(limit = 20) {
    return db.prepare('SELECT * FROM audit_logs ORDER BY created_at DESC LIMIT ?').all(limit);
  }
}