import { Injectable } from '@nestjs/common';
import { randomUUID } from 'crypto';
import { getStore } from '../common/store';

export interface Feedback {
  id: string;
  openid: string;
  content: string;
  contact?: string;
  createdAt: string;
}

@Injectable()
export class FeedbackService {
  private store = getStore<Feedback>('feedback');

  submit(openid: string, content: string, contact?: string): Feedback {
    return this.store.insert({
      id: randomUUID(),
      openid,
      content,
      contact: contact || undefined,
      createdAt: new Date().toISOString(),
    });
  }

  // 管理员视角：按时间倒序返回全部留言
  list(): Feedback[] {
    return this.store
      .all()
      .sort((a, b) => (a.createdAt < b.createdAt ? 1 : -1));
  }
}