// src/module/workflow-automation/service/action-registry.service.ts
import { Injectable, OnModuleInit } from '@nestjs/common';
import { DiscoveryService, ModuleRef, Reflector } from '@nestjs/core';
import { WorkflowAutomationEngineService } from './workflow-automation-engine.service';
import { Action } from '../interface/action.interface';
import { ACTION_HANDLER } from '../interface/action.decorator';

@Injectable()
export class ActionRegistryService implements OnModuleInit {
  constructor(
    private readonly discoveryService: DiscoveryService,
    private readonly moduleRef: ModuleRef,
    private readonly reflector: Reflector,
    private readonly engine: WorkflowAutomationEngineService,
  ) {}

  onModuleInit() {
    const providers = this.discoveryService.getProviders();

    for (const wrapper of providers) {
      const { instance } = wrapper;
      if (!instance) continue;

      const actionName = this.reflector.get<string>(
        ACTION_HANDLER,
        instance.constructor,
      );

      if (actionName) {
        this.engine.registerAction(actionName, instance as Action);
        console.log(`✅ Registered action handler: ${actionName}`);
      }
    }
  }
}