import { EventsHandler, IEventHandler } from '@nestjs/cqrs';
import { IssueAssignedEvent } from '@task-stream/api/tracker/domain';
import { UpsertMaterializedIssueRepository } from '../ports/upsert-materialized-issue.repository';
import { UserDirectory } from '../ports/user-directory';
import { ReadModelNotifier, versionOf } from './read-model-notifier';

@EventsHandler(IssueAssignedEvent)
export class IssueAssignedEventHandler
  implements IEventHandler<IssueAssignedEvent>
{
  constructor(
    private readonly upsertMaterializedIssueRepository: UpsertMaterializedIssueRepository,
    private readonly users: UserDirectory,
    private readonly notifier: ReadModelNotifier,
  ) {}

  async handle(event: IssueAssignedEvent) {
    const users = await this.users.refs([event.assigneeId]);
    await this.upsertMaterializedIssueRepository.upsert({
      id: event.aggregateId,
      assignee: users.ofNullable(event.assigneeId),
      updatedAt: event.occurredAt,
      version: versionOf(event),
    });
    await this.notifier.issue(event.aggregateId, event);
  }
}