import { Injectable, Logger } from '@nestjs/common';
import { DocumentImportRepository } from './document-import.repository';
import { RedisService } from '../../infrastructure/redis/redis.service';
import { QueueService } from '../../infrastructure/queue/queue.service';

@Injectable()
export class DocumentImportService {
  private readonly logger = new Logger(DocumentImportService.name);

  constructor(
    private readonly repository: DocumentImportRepository,
    private readonly redis: RedisService,
    private readonly queue: QueueService,
  ) {}

  async createImport(dto: any) {
    const lockKey = `lock:document-import:${dto.fileName || Date.now()}`;
    const lockToken = await this.redis.lock(lockKey, 1800);
    if (!lockToken) {
      throw new Error('相同文件正在导入中，请稍候');
    }

    const job = await this.repository.create(dto);

    await this.redis.set(`job:document-import:${job.id}:status`, 'pending', 86400);
    await this.redis.set(`job:document-import:${job.id}:progress`, '0', 86400);
    await this.redis.set(`job:document-import:${job.id}:message`, '任务已加入队列', 86400);

    this.queue.add('document-import', { importId: job.id, userId: dto.userId || 'anonymous' });

    this.processImport(job, lockKey, lockToken);

    return job;
  }

  private processImport(job: any, lockKey: string, lockToken: string) {
    this.repository.updateStatus(job.id, 'processing');
    this.redis.set(`job:document-import:${job.id}:status`, 'parsing', 86400);
    this.redis.set(`job:document-import:${job.id}:message`, '正在解析文件', 86400);
    this.redis.set(`job:document-import:${job.id}:progress`, '25', 86400);

    setTimeout(async () => {
      await this.redis.set(`job:document-import:${job.id}:status`, 'chunking', 86400);
      await this.redis.set(`job:document-import:${job.id}:message`, '正在分段提取', 86400);
      await this.redis.set(`job:document-import:${job.id}:progress`, '50', 86400);

      setTimeout(async () => {
        await this.redis.set(`job:document-import:${job.id}:status`, 'generating', 86400);
        await this.redis.set(`job:document-import:${job.id}:message`, '正在生成知识点', 86400);
        await this.redis.set(`job:document-import:${job.id}:progress`, '75', 86400);

        setTimeout(async () => {
          this.repository.updateStatus(job.id, 'completed');
          await this.redis.set(`job:document-import:${job.id}:status`, 'completed', 86400);
          await this.redis.set(`job:document-import:${job.id}:progress`, '100', 86400);
          await this.redis.unlock(lockKey, lockToken);
          this.logger.log(`Import ${job.id} completed`);
        }, 1000);
      }, 1000);
    }, 1000);
  }

  async getStatus(id: string) {
    const redisStatus = await this.redis.get(`job:document-import:${id}:status`);
    const redisProgress = await this.redis.get(`job:document-import:${id}:progress`);
    const redisMessage = await this.redis.get(`job:document-import:${id}:message`);
    const dbJob = await this.repository.findById(id);

    return {
      id,
      fileName: dbJob?.sourceName,
      status: redisStatus || dbJob?.status || 'unknown',
      progress: redisProgress ? parseInt(redisProgress, 10) : 0,
      message: redisMessage || null,
    };
  }
}