import { Injectable, Logger, OnModuleInit } from '@nestjs/common';
import { JobDefinitionRegistry, DuplicateJobTypeError } from './job-definition-registry';
import { FEYNMAN_JOB_DEFINITION } from './feynman-job-definition';

/**
 * M-AI-05-02: Feynman Job Definition 注册服务
 *
 * 在模块初始化（onModuleInit）时向 JobDefinitionRegistry 注册
 * FeynmanEvaluation JobDefinition。
 *
 * 容忍重复注册：API 进程和 Worker 进程各自独立启动，均导入
 * AiJobModule，因此同一 Definition 会被注册两次。第二次注册的
 * DuplicateJobTypeError 被安全捕获，不阻止进程启动。
 */
@Injectable()
export class FeynmanRegistrationService implements OnModuleInit {
  private readonly logger = new Logger(FeynmanRegistrationService.name);

  constructor(private readonly registry: JobDefinitionRegistry) {}

  onModuleInit(): void {
    try {
      this.registry.register(FEYNMAN_JOB_DEFINITION);
      this.logger.log(
        `Feynman Job Definition registered: ` +
        `jobType="${FEYNMAN_JOB_DEFINITION.jobType}" ` +
        `queue="${FEYNMAN_JOB_DEFINITION.queue.queueName}" ` +
        `timeout=${FEYNMAN_JOB_DEFINITION.execution.timeoutMs}ms ` +
        `retries=${FEYNMAN_JOB_DEFINITION.execution.maxRetries}`,
      );
    } catch (err: unknown) {
      if (err instanceof DuplicateJobTypeError) {
        this.logger.log(
          `Feynman Job Definition already registered ` +
          `(by another process — e.g. API + Worker both import AiJobModule)`,
        );
      } else {
        throw err;
      }
    }
  }
}