import { EventsHandler, IEventHandler } from '@nestjs/cqrs';
import {
  DEFAULT_PROJECT_SETTINGS,
  IssueCreatedEvent,
  implicitRank,
  ProjectWorkflow,
} from '@task-stream/api/tracker/domain';
import { FindProjectsRepository } from '../ports/find-projects.repository';
import { FindReleasesRepository } from '../ports/find-releases.repository';
import { UpsertMaterializedIssueRepository } from '../ports/upsert-materialized-issue.repository';
import { UserDirectory } from '../ports/user-directory';
import { ReadModelNotifier, versionOf } from './read-model-notifier';

@EventsHandler(IssueCreatedEvent)
export class IssueCreatedEventHandler
  implements IEventHandler<IssueCreatedEvent>
{
  constructor(
    private readonly upsertMaterializedIssueRepository: UpsertMaterializedIssueRepository,
    private readonly findReleases: FindReleasesRepository,
    private readonly findProjects: FindProjectsRepository,
    private readonly users: UserDirectory,
    private readonly notifier: ReadModelNotifier,
  ) {}

  async handle(event: IssueCreatedEvent) {
    const { issue } = event;
    const users = await this.users.refs([issue.reporterId, issue.assigneeId]);
    const project = await this.findProjects.findById(issue.projectId);
    const workflow = new ProjectWorkflow(
      project?.settings ?? DEFAULT_PROJECT_SETTINGS,
    );
    const release = issue.releaseId
      ? await this.findReleases.findById(issue.releaseId)
      : null;
    await this.upsertMaterializedIssueRepository.upsert({
      id: issue.id,
      projectId: issue.projectId,
      projectKey: issue.key.slice(0, issue.key.lastIndexOf('-')),
      number: issue.number,
      key: issue.key,
      type: issue.type,
      area: issue.area,
      title: issue.title,
      description: issue.description,
      status: issue.status,
      statusCategory: workflow.categoryOf(issue.status),
      priority: issue.priority,
      reporter: users.of(issue.reporterId),
      assignee: users.ofNullable(issue.assigneeId),
      release: release ? { id: release.id, name: release.name } : null,
      parent: null,
      sprint: null,
      rank: implicitRank(issue.number),
      labels: issue.labels,
      figmaUrl: issue.figmaUrl,
      storyPoints: issue.storyPoints,
      startDate: issue.startDate ?? null,
      dueDate: issue.dueDate,
      createdAt: issue.createdAt,
      updatedAt: issue.updatedAt,
      version: versionOf(event),
    });
    await this.notifier.issue(issue.id, event);
  }
}