task-stream/libs/api/tracker/application/src/lib/event-handlers/project-created.event-handler.ts

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

@EventsHandler(ProjectCreatedEvent)
export class ProjectCreatedEventHandler
  implements IEventHandler<ProjectCreatedEvent>
{
  constructor(
    private readonly upsertMaterializedProjectRepository: UpsertMaterializedProjectRepository,
    private readonly users: UserDirectory,
    private readonly notifier: ReadModelNotifier,
  ) {}

  async handle(event: ProjectCreatedEvent) {
    const { project } = event;
    const users = await this.users.refs(project.members.map((m) => m.userId));
    await this.upsertMaterializedProjectRepository.upsert({
      id: project.id,
      key: project.key,
      name: project.name,
      description: project.description,
      owner: users.of(project.ownerId),
      members: project.members.map((m) => ({
        user: users.of(m.userId),
        role: m.role,
      })),
      // Projects created before settings existed get the defaults.
      settings: project.settings ?? defaultProjectSettings(),
      createdAt: project.createdAt,
      updatedAt: project.updatedAt,
      version: versionOf(event),
    });
    await this.notifier.project(event, [project.ownerId]);
  }
}