import { Injectable, BadRequestException, NotFoundException } from '@nestjs/common';
import { KnowledgeBaseRepository } from './knowledge-base.repository';
import { MAX_KNOWLEDGE_BASE_COUNT } from './constants/knowledge-base.constants';

@Injectable()
export class KnowledgeBaseService {
  constructor(private readonly repository: KnowledgeBaseRepository) {}

  async create(userId: string, dto: any) {
    const count = await this.repository.countByUserId(userId);
    if (count >= MAX_KNOWLEDGE_BASE_COUNT) {
      throw new BadRequestException('知识库数量已达到上限');
    }
    return this.repository.create(userId, dto);
  }

  async findAll(userId: string, pagination: { page?: number; limit?: number }) {
    return this.repository.findAllByUserId(userId, pagination);
  }

  async findOne(userId: string, id: string) {
    const kb = await this.repository.findById(id);
    if (!kb || String(kb.userId) !== userId) {
      throw new NotFoundException('知识库不存在');
    }
    return kb;
  }

  async update(userId: string, id: string, dto: any) {
    const kb = await this.repository.findById(id);
    if (!kb || String(kb.userId) !== userId) {
      throw new NotFoundException('知识库不存在');
    }
    return this.repository.update(id, dto);
  }

  async remove(userId: string, id: string) {
    const kb = await this.repository.findById(id);
    if (!kb || String(kb.userId) !== userId) {
      throw new NotFoundException('知识库不存在');
    }
    return this.repository.softDelete(id);
  }
}