import { Injectable } from '@nestjs/common';
import { PrismaService } from '../../infrastructure/database/prisma.service';

@Injectable()
export class KnowledgeItemsRepository {
  constructor(private readonly prisma: PrismaService) {}

  async create(userId: string, knowledgeBaseId: string, dto: {
    title?: string;
    content?: string;
    parentId?: string;
    itemType?: string;
    orderIndex?: number;
  }) {
    return this.prisma.knowledgeItem.create({
      data: {
        userId,
        knowledgeBaseId,
        title: dto.title ?? '',
        content: dto.content ?? '',
        parentId: dto.parentId ?? null,
        itemType: dto.itemType ?? 'lesson',
        orderIndex: dto.orderIndex ?? 0,
      },
    });
  }

  async findById(id: string) {
    return this.prisma.knowledgeItem.findUnique({ where: { id } });
  }

  async findByKnowledgeBaseId(knowledgeBaseId: string) {
    return this.prisma.knowledgeItem.findMany({
      where: { knowledgeBaseId, deletedAt: null },
      orderBy: { orderIndex: 'asc' },
    });
  }

  async update(id: string, dto: Record<string, any>) {
    return this.prisma.knowledgeItem.update({
      where: { id },
      data: dto,
    });
  }
}