import { Injectable, NotFoundException } from '@nestjs/common';
import { LearningSessionRepository } from './learning-session.repository';

@Injectable()
export class LearningSessionService {
  constructor(private readonly repository: LearningSessionRepository) {}

  async start(userId: string, dto: any) {
    return this.repository.create(userId, dto);
  }

  async end(id: string) {
    const session = await this.repository.end(id);
    if (!session) throw new NotFoundException('会话不存在');
    return session;
  }

  async findByUserId(userId: string, opts: { page?: number; limit?: number; status?: string; sort?: string }) {
    return this.repository.findByUserId(userId, opts);
  }

  /** Upsert a session from a reading event (M8 aggregation). */
  async upsertFromReadingEvent(data: {
    userId: string;
    clientSessionId: string;
    materialId: string;
    readingTargetType: string;
    knowledgeBaseId?: string | null;
    eventType: string;
    activeSecondsDelta: number;
    position?: any;
    timestampMs: number;
    startedAt: Date;
  }) {
    return this.repository.upsertByClientSession(data);
  }
}