import { IQueryHandler, Query, QueryHandler } from '@nestjs/cqrs';
import {
  DEFAULT_PROJECT_SETTINGS,
  ProjectWorkflow,
} from '@task-stream/api/tracker/domain';
import { FindIssuesRepository } from '../ports/find-issues.repository';
import { FindProjectsRepository } from '../ports/find-projects.repository';
import { FindReleasesRepository } from '../ports/find-releases.repository';
import { draftReleaseNotes } from '../releases/release-notes';
import { ReadAccess } from './read-access';

/** A Markdown draft of a release's notes, from its finished tickets. */
export class GetReleaseNotesDraftQuery extends Query<string> {
  constructor(
    public readonly viewerId: string | null,
    public readonly releaseId: string,
  ) {
    super();
  }
}

@QueryHandler(GetReleaseNotesDraftQuery)
export class GetReleaseNotesDraftQueryHandler
  implements IQueryHandler<GetReleaseNotesDraftQuery, string>
{
  constructor(
    private readonly findReleases: FindReleasesRepository,
    private readonly findIssues: FindIssuesRepository,
    private readonly findProjects: FindProjectsRepository,
    private readonly access: ReadAccess,
  ) {}

  async execute(query: GetReleaseNotesDraftQuery): Promise<string> {
    const release = this.access.assertFound(
      await this.findReleases.findById(query.releaseId),
      'Release',
      query.releaseId,
    );
    await this.access.assertSeesWholeProject(
      release.projectId,
      query.viewerId,
      {
        entity: 'Release',
        ref: query.releaseId,
      },
    );
    const [page, project] = await Promise.all([
      this.findIssues.search({
        projectId: release.projectId,
        releaseId: release.id,
        limit: 500,
        offset: 0,
      }),
      this.findProjects.findById(release.projectId),
    ]);
    return draftReleaseNotes({
      release,
      issues: page.items,
      workflow: new ProjectWorkflow(
        project?.settings ?? DEFAULT_PROJECT_SETTINGS,
      ),
    });
  }
}